diff --git a/extensions/twitch/src/access-control.test.ts b/extensions/twitch/src/access-control.test.ts
new file mode 100644
index 000000000..77105d522
--- /dev/null
+++ b/extensions/twitch/src/access-control.test.ts
@@ -0,0 +1,387 @@
+import { describe, expect, it } from "vitest";
+import { checkTwitchAccessControl, extractMentions } from "./access-control.js";
+import type { TwitchAccountConfig, TwitchChatMessage } from "./types.js";
+
+describe("checkTwitchAccessControl", () => {
+	const mockAccount: TwitchAccountConfig = {
+		username: "testbot",
+		token: "oauth:test",
+	};
+
+	const mockMessage: TwitchChatMessage = {
+		username: "testuser",
+		userId: "123456",
+		message: "hello bot",
+		channel: "testchannel",
+	};
+
+	describe("when no restrictions are configured", () => {
+		it("allows all messages", () => {
+			const result = checkTwitchAccessControl({
+				message: mockMessage,
+				account: mockAccount,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+	});
+
+	describe("requireMention", () => {
+		it("allows messages that mention the bot", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				requireMention: true,
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				message: "@testbot hello",
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+
+		it("blocks messages that don't mention the bot", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				requireMention: true,
+			};
+
+			const result = checkTwitchAccessControl({
+				message: mockMessage,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(false);
+			expect(result.reason).toContain("does not mention the bot");
+		});
+
+		it("is case-insensitive for bot username", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				requireMention: true,
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				message: "@TestBot hello",
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+	});
+
+	describe("allowFrom allowlist", () => {
+		it("allows users in the allowlist", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowFrom: ["123456", "789012"],
+			};
+
+			const result = checkTwitchAccessControl({
+				message: mockMessage,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+			expect(result.matchKey).toBe("123456");
+			expect(result.matchSource).toBe("allowlist");
+		});
+
+		it("blocks users not in the allowlist", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowFrom: ["789012"],
+			};
+
+			const result = checkTwitchAccessControl({
+				message: mockMessage,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(false);
+			expect(result.reason).toContain("not in allowlist");
+		});
+
+		it("blocks messages without userId", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowFrom: ["123456"],
+			};
+			const message = { ...mockMessage, userId: undefined };
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(false);
+			expect(result.reason).toContain("user ID not available");
+		});
+
+		it("bypasses role checks when user is in allowlist", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowFrom: ["123456"],
+				allowedRoles: ["owner"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isOwner: false,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+	});
+
+	describe("allowedRoles", () => {
+		it("allows users with matching role", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["moderator"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isMod: true,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+			expect(result.matchSource).toBe("role");
+		});
+
+		it("allows users with any of multiple roles", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["moderator", "vip", "subscriber"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isVip: true,
+				isMod: false,
+				isSub: false,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+
+		it("blocks users without matching role", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["moderator"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isMod: false,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(false);
+			expect(result.reason).toContain(
+				"does not have any of the required roles",
+			);
+		});
+
+		it("allows all users when role is 'all'", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["all"],
+			};
+
+			const result = checkTwitchAccessControl({
+				message: mockMessage,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+			expect(result.matchKey).toBe("all");
+		});
+
+		it("handles moderator role", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["moderator"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isMod: true,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+
+		it("handles subscriber role", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["subscriber"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isSub: true,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+
+		it("handles owner role", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["owner"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isOwner: true,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+
+		it("handles vip role", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowedRoles: ["vip"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isVip: true,
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+		});
+	});
+
+	describe("combined restrictions", () => {
+		it("checks requireMention before allowlist", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				requireMention: true,
+				allowFrom: ["123456"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				message: "hello", // No mention
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(false);
+			expect(result.reason).toContain("does not mention the bot");
+		});
+
+		it("checks allowlist before allowedRoles", () => {
+			const account: TwitchAccountConfig = {
+				...mockAccount,
+				allowFrom: ["123456"],
+				allowedRoles: ["owner"],
+			};
+			const message: TwitchChatMessage = {
+				...mockMessage,
+				isOwner: false, // Not owner, but in allowlist
+			};
+
+			const result = checkTwitchAccessControl({
+				message,
+				account,
+				botUsername: "testbot",
+			});
+			expect(result.allowed).toBe(true);
+			expect(result.matchSource).toBe("allowlist");
+		});
+	});
+});
+
+describe("extractMentions", () => {
+	it("extracts single mention", () => {
+		const mentions = extractMentions("hello @testbot");
+		expect(mentions).toEqual(["testbot"]);
+	});
+
+	it("extracts multiple mentions", () => {
+		const mentions = extractMentions("hello @testbot and @otheruser");
+		expect(mentions).toEqual(["testbot", "otheruser"]);
+	});
+
+	it("returns empty array when no mentions", () => {
+		const mentions = extractMentions("hello everyone");
+		expect(mentions).toEqual([]);
+	});
+
+	it("handles mentions at start of message", () => {
+		const mentions = extractMentions("@testbot hello");
+		expect(mentions).toEqual(["testbot"]);
+	});
+
+	it("handles mentions at end of message", () => {
+		const mentions = extractMentions("hello @testbot");
+		expect(mentions).toEqual(["testbot"]);
+	});
+
+	it("converts mentions to lowercase", () => {
+		const mentions = extractMentions("hello @TestBot");
+		expect(mentions).toEqual(["testbot"]);
+	});
+
+	it("extracts alphanumeric usernames", () => {
+		const mentions = extractMentions("hello @user123");
+		expect(mentions).toEqual(["user123"]);
+	});
+
+	it("handles underscores in usernames", () => {
+		const mentions = extractMentions("hello @test_user");
+		expect(mentions).toEqual(["test_user"]);
+	});
+
+	it("handles empty string", () => {
+		const mentions = extractMentions("");
+		expect(mentions).toEqual([]);
+	});
+});
diff --git a/extensions/twitch/src/access-control.ts b/extensions/twitch/src/access-control.ts
new file mode 100644
index 000000000..cb0bed15b
--- /dev/null
+++ b/extensions/twitch/src/access-control.ts
@@ -0,0 +1,169 @@
+import type { TwitchAccountConfig, TwitchChatMessage } from "./types.js";
+
+/**
+ * Result of checking access control for a Twitch message
+ */
+export type TwitchAccessControlResult = {
+	allowed: boolean;
+	reason?: string;
+	matchKey?: string;
+	matchSource?: string;
+};
+
+/**
+ * Check if a Twitch message should be allowed based on account configuration
+ *
+ * This function implements the access control logic for incoming Twitch messages,
+ * checking allowlists, role-based restrictions, and mention requirements.
+ *
+ * Priority order:
+ * 1. If `requireMention` is true, message must mention the bot
+ * 2. If `allowFrom` is set, sender must be in the allowlist (by user ID)
+ * 3. If `allowedRoles` is set, sender must have at least one of the specified roles
+ *
+ * Note: You can combine `allowFrom` with `allowedRoles`. If a user is in `allowFrom`,
+ * they bypass role checks. This is useful for allowing specific users regardless of role.
+ *
+ * Available roles:
+ * - "moderator": Moderators
+ * - "owner": Channel owner/broadcaster
+ * - "vip": VIPs
+ * - "subscriber": Subscribers
+ * - "all": Anyone in the chat
+ */
+export function checkTwitchAccessControl(params: {
+	message: TwitchChatMessage;
+	account: TwitchAccountConfig;
+	botUsername: string;
+}): TwitchAccessControlResult {
+	const { message, account, botUsername } = params;
+
+	// Check mention requirement first
+	if (account.requireMention) {
+		const mentions = extractMentions(message.message);
+		if (!mentions.includes(botUsername.toLowerCase())) {
+			return {
+				allowed: false,
+				reason: "message does not mention the bot (requireMention is enabled)",
+			};
+		}
+	}
+
+	// Check allowlist (by user ID)
+	if (account.allowFrom && account.allowFrom.length > 0) {
+		const allowFrom = account.allowFrom;
+		const senderId = message.userId;
+
+		if (!senderId) {
+			return {
+				allowed: false,
+				reason: "sender user ID not available for allowlist check",
+			};
+		}
+
+		// Check if sender is in allowlist
+		if (!allowFrom.includes(senderId)) {
+			return {
+				allowed: false,
+				reason: "sender not in allowlist",
+			};
+		}
+
+		// Sender is in allowlist, no need to check role restrictions
+		return {
+			allowed: true,
+			matchKey: senderId,
+			matchSource: "allowlist",
+		};
+	}
+
+	// Check role-based restrictions
+	if (account.allowedRoles && account.allowedRoles.length > 0) {
+		const allowedRoles = account.allowedRoles;
+
+		// "all" grants access to everyone
+		if (allowedRoles.includes("all")) {
+			return {
+				allowed: true,
+				matchKey: "all",
+				matchSource: "role",
+			};
+		}
+
+		// Check if sender has any of the allowed roles
+		const hasAllowedRole = checkSenderRoles({
+			message,
+			allowedRoles,
+		});
+
+		if (!hasAllowedRole) {
+			return {
+				allowed: false,
+				reason: `sender does not have any of the required roles: ${allowedRoles.join(", ")}`,
+			};
+		}
+
+		return {
+			allowed: true,
+			matchKey: allowedRoles.join(","),
+			matchSource: "role",
+		};
+	}
+
+	// No restrictions configured - allow everyone
+	return {
+		allowed: true,
+	};
+}
+
+/**
+ * Check if the sender has any of the allowed roles
+ */
+function checkSenderRoles(params: {
+	message: TwitchChatMessage;
+	allowedRoles: string[];
+}): boolean {
+	const { message, allowedRoles } = params;
+	const { isMod, isOwner, isVip, isSub } = message;
+
+	for (const role of allowedRoles) {
+		switch (role) {
+			case "moderator":
+				if (isMod) return true;
+				break;
+			case "owner":
+				if (isOwner) return true;
+				break;
+			case "vip":
+				if (isVip) return true;
+				break;
+			case "subscriber":
+				if (isSub) return true;
+				break;
+		}
+	}
+
+	return false;
+}
+
+/**
+ * Extract @mentions from a Twitch chat message
+ *
+ * Returns a list of lowercase usernames that were mentioned in the message.
+ * Twitch mentions are in the format @username.
+ */
+export function extractMentions(message: string): string[] {
+	const mentionRegex = /@(\w+)/g;
+	const mentions: string[] = [];
+	let match: RegExpExecArray | null;
+
+	// biome-ignore lint/suspicious/noAssignInExpressions: Standard regex iteration pattern
+	while ((match = mentionRegex.exec(message)) !== null) {
+		const username = match[1];
+		if (username) {
+			mentions.push(username.toLowerCase());
+		}
+	}
+
+	return mentions;
+}
diff --git a/extensions/twitch/src/actions.ts b/extensions/twitch/src/actions.ts
new file mode 100644
index 000000000..20d1d5d3d
--- /dev/null
+++ b/extensions/twitch/src/actions.ts
@@ -0,0 +1,207 @@
+/**
+ * Twitch message actions adapter.
+ *
+ * Handles tool-based actions for Twitch, such as sending messages.
+ */
+
+import { DEFAULT_ACCOUNT_ID, getAccountConfig } from "./config.js";
+import { twitchOutbound } from "./outbound.js";
+import type {
+	ChannelMessageActionAdapter,
+	ChannelMessageActionContext,
+} from "./types.js";
+
+/**
+ * Read a string parameter from action arguments.
+ *
+ * @param args - Action arguments
+ * @param key - Parameter key
+ * @param options - Options for reading the parameter
+ * @returns The parameter value or undefined if not found
+ */
+function readStringParam(
+	args: Record<string, unknown>,
+	key: string,
+	options: { required?: boolean; trim?: boolean } = {},
+): string | undefined {
+	const value = args[key];
+	if (value === undefined || value === null) {
+		if (options.required) {
+			throw new Error(`Missing required parameter: ${key}`);
+		}
+		return undefined;
+	}
+
+	const str = String(value);
+	return options.trim !== false ? str.trim() : str;
+}
+
+/**
+ * Twitch message actions adapter.
+ *
+ * Supports the "send" action for sending messages to Twitch channels.
+ */
+export const twitchMessageActions: ChannelMessageActionAdapter = {
+	/**
+	 * List available actions for this channel.
+	 *
+	 * Currently supports:
+	 * - "send" - Send a message to a Twitch channel
+	 *
+	 * @param params - Parameters including config
+	 * @returns Array of available action names
+	 */
+	listActions: () => {
+		// TODO: Add action gate pattern for configurable actions
+		const actions = new Set<string>(["send"]);
+		return Array.from(actions);
+	},
+
+	/**
+	 * Check if an action is supported.
+	 *
+	 * @param params - Action to check
+	 * @returns true if the action is supported
+	 */
+	supportsAction: ({ action }) => {
+		return action === "send";
+	},
+
+	/**
+	 * Extract tool send parameters from action arguments.
+	 *
+	 * Parses and validates the "to" and "message" parameters for sending.
+	 *
+	 * @param params - Arguments from the tool call
+	 * @returns Parsed send parameters or null if invalid
+	 *
+	 * @example
+	 * const result = twitchMessageActions.extractToolSend!({
+	 *   args: { to: "#mychannel", message: "Hello!" }
+	 * });
+	 * // Returns: { to: "#mychannel", message: "Hello!" }
+	 */
+	extractToolSend: ({ args }) => {
+		try {
+			const to = readStringParam(args, "to", { required: true });
+			const message = readStringParam(args, "message", { required: true });
+
+			if (!to || !message) {
+				return null;
+			}
+
+			return { to, message };
+		} catch {
+			return null;
+		}
+	},
+
+	/**
+	 * Handle an action execution.
+	 *
+	 * Processes the "send" action to send messages to Twitch.
+	 *
+	 * @param ctx - Action context including action type, parameters, and config
+	 * @returns Tool result with content or null if action not supported
+	 *
+	 * @example
+	 * const result = await twitchMessageActions.handleAction!({
+	 *   action: "send",
+	 *   params: { message: "Hello Twitch!", to: "#mychannel" },
+	 *   cfg: clawdbotConfig,
+	 *   accountId: "default",
+	 * });
+	 */
+	handleAction: async (
+		ctx: ChannelMessageActionContext,
+	): Promise<{ content: Array<{ type: string; text: string }> } | null> => {
+		if (ctx.action === "send") {
+			const message = readStringParam(ctx.params, "message", {
+				required: true,
+			});
+			const to = readStringParam(ctx.params, "to", { required: false });
+			const accountId = ctx.accountId ?? DEFAULT_ACCOUNT_ID;
+
+			const account = getAccountConfig(ctx.cfg, accountId);
+			if (!account) {
+				return {
+					content: [
+						{
+							type: "text",
+							text: JSON.stringify({
+								ok: false,
+								error: `Account not found: ${accountId}. Available accounts: ${Object.keys(ctx.cfg.channels?.twitch?.accounts ?? {}).join(", ") || "none"}`,
+							}),
+						},
+					],
+				};
+			}
+
+			// Use the channel from account config if not specified
+			const targetChannel = to || account.channel || account.username;
+
+			if (!targetChannel) {
+				return {
+					content: [
+						{
+							type: "text",
+							text: JSON.stringify({
+								ok: false,
+								error:
+									"No channel specified and no default channel in account config",
+							}),
+						},
+					],
+				};
+			}
+
+			try {
+				if (!twitchOutbound.sendText) {
+					return {
+						content: [
+							{
+								type: "text",
+								text: JSON.stringify({
+									ok: false,
+									error: "sendText not implemented",
+								}),
+							},
+						],
+					};
+				}
+
+				const result = await twitchOutbound.sendText({
+					cfg: ctx.cfg,
+					to: targetChannel,
+					text: message ?? "",
+					accountId,
+				});
+
+				return {
+					content: [
+						{
+							type: "text",
+							text: JSON.stringify(result),
+						},
+					],
+				};
+			} catch (error) {
+				const errorMsg = error instanceof Error ? error.message : String(error);
+				return {
+					content: [
+						{
+							type: "text",
+							text: JSON.stringify({
+								ok: false,
+								error: errorMsg,
+							}),
+						},
+					],
+				};
+			}
+		}
+
+		// Action not supported
+		return null;
+	},
+};
diff --git a/extensions/twitch/src/cli/test-connect.ts b/extensions/twitch/src/cli/test-connect.ts
new file mode 100644
index 000000000..2a3259a5f
--- /dev/null
+++ b/extensions/twitch/src/cli/test-connect.ts
@@ -0,0 +1,98 @@
+import { StaticAuthProvider } from "@twurple/auth";
+import { ChatClient } from "@twurple/chat";
+
+type Args = {
+	token?: string;
+	clientId?: string;
+	username?: string;
+	channel?: string;
+	message?: string;
+	timeoutMs: number;
+};
+
+function parseArgs(argv: string[]): Args {
+	const args: Args = { timeoutMs: 10000 };
+	for (let i = 0; i < argv.length; i += 1) {
+		const key = argv[i];
+		const value = argv[i + 1];
+		if (!key?.startsWith("--")) continue;
+		switch (key) {
+			case "--token":
+				args.token = value;
+				i += 1;
+				break;
+			case "--client-id":
+				args.clientId = value;
+				i += 1;
+				break;
+			case "--username":
+				args.username = value;
+				i += 1;
+				break;
+			case "--channel":
+				args.channel = value;
+				i += 1;
+				break;
+			case "--message":
+				args.message = value;
+				i += 1;
+				break;
+			case "--timeout-ms":
+				args.timeoutMs = Number(value ?? 10000);
+				i += 1;
+				break;
+			default:
+				break;
+		}
+	}
+	return args;
+}
+
+async function run(): Promise<void> {
+	const args = parseArgs(process.argv.slice(2));
+	const token = args.token;
+	const clientId = args.clientId;
+	const username = args.username;
+	const channel = args.channel ?? username;
+
+	if (!token || !clientId || !username || !channel) {
+		console.error(
+			"Usage: npx tsx src/cli/test-connect.ts --token <token> --client-id <id> --username <bot> --channel <channel> [--timeout-ms 10000]",
+		);
+		process.exit(2);
+	}
+
+	const normalizedToken = token.startsWith("oauth:") ? token.slice(6) : token;
+
+	const authProvider = new StaticAuthProvider(clientId, normalizedToken);
+	const client = new ChatClient({
+		authProvider,
+		requestMembershipEvents: true,
+	});
+
+	const timeout = setTimeout(
+		() => {
+			console.error("Timed out waiting for connection.");
+			process.exit(1);
+		},
+		Number.isFinite(args.timeoutMs) ? args.timeoutMs : 10000,
+	);
+
+	try {
+		await client.connect();
+		await client.join(channel);
+		console.log(`Connected as ${username} and joined #${channel}`);
+		if (args.message) {
+			await client.say(channel, args.message);
+			console.log("Message sent.");
+		}
+	} finally {
+		clearTimeout(timeout);
+		client.quit();
+	}
+}
+
+run().catch((error) => {
+	console.error(error instanceof Error ? error.message : String(error));
+	process.exit(1);
+});
diff --git a/extensions/twitch/src/config.test.ts b/extensions/twitch/src/config.test.ts
new file mode 100644
index 000000000..e86a65769
--- /dev/null
+++ b/extensions/twitch/src/config.test.ts
@@ -0,0 +1,92 @@
+import { describe, expect, it } from "vitest";
+
+import { getAccountConfig, parsePluginConfig } from "./config.js";
+
+describe("parsePluginConfig", () => {
+	it("parses valid config with stripMarkdown true", () => {
+		const result = parsePluginConfig({ stripMarkdown: true });
+		expect(result.stripMarkdown).toBe(true);
+	});
+
+	it("parses valid config with stripMarkdown false", () => {
+		const result = parsePluginConfig({ stripMarkdown: false });
+		expect(result.stripMarkdown).toBe(false);
+	});
+
+	it("defaults to stripMarkdown true when not specified", () => {
+		const result = parsePluginConfig({});
+		expect(result.stripMarkdown).toBe(true);
+	});
+
+	it("handles undefined config", () => {
+		const result = parsePluginConfig(
+			undefined as unknown as Record<string, unknown>,
+		);
+		expect(result).toEqual({ stripMarkdown: true }); // Returns defaults when value is falsy
+	});
+
+	it("handles null config", () => {
+		const result = parsePluginConfig(
+			null as unknown as Record<string, unknown>,
+		);
+		expect(result).toEqual({ stripMarkdown: true }); // Returns defaults when value is null
+	});
+});
+
+describe("getAccountConfig", () => {
+	const mockCoreConfig = {
+		channels: {
+			twitch: {
+				accounts: {
+					default: {
+						username: "testbot",
+						token: "oauth:test123",
+					},
+				},
+			},
+		},
+	};
+
+	it("returns account config for valid account ID", () => {
+		const result = getAccountConfig(mockCoreConfig, "default");
+
+		expect(result).not.toBeNull();
+		expect(result?.username).toBe("testbot");
+	});
+
+	it("returns null for non-existent account ID", () => {
+		const result = getAccountConfig(mockCoreConfig, "nonexistent");
+
+		expect(result).toBeNull();
+	});
+
+	it("returns null when core config is null", () => {
+		const result = getAccountConfig(null, "default");
+
+		expect(result).toBeNull();
+	});
+
+	it("returns null when core config is undefined", () => {
+		const result = getAccountConfig(undefined, "default");
+
+		expect(result).toBeNull();
+	});
+
+	it("returns null when channels are not defined", () => {
+		const result = getAccountConfig({}, "default");
+
+		expect(result).toBeNull();
+	});
+
+	it("returns null when twitch is not defined", () => {
+		const result = getAccountConfig({ channels: {} }, "default");
+
+		expect(result).toBeNull();
+	});
+
+	it("returns null when accounts are not defined", () => {
+		const result = getAccountConfig({ channels: { twitch: {} } }, "default");
+
+		expect(result).toBeNull();
+	});
+});
diff --git a/extensions/twitch/src/config.ts b/extensions/twitch/src/config.ts
new file mode 100644
index 000000000..465c6db03
--- /dev/null
+++ b/extensions/twitch/src/config.ts
@@ -0,0 +1,65 @@
+import type {
+	CoreConfig,
+	TwitchAccountConfig,
+	TwitchPluginConfig,
+} from "./types.js";
+
+/**
+ * Default account ID for Twitch
+ */
+export const DEFAULT_ACCOUNT_ID = "default";
+
+/**
+ * Get account config from core config
+ */
+export function getAccountConfig(
+	coreConfig: unknown,
+	accountId: string,
+): TwitchAccountConfig | null {
+	if (!coreConfig || typeof coreConfig !== "object") {
+		return null;
+	}
+
+	const cfg = coreConfig as Record<string, unknown>;
+	const channels = cfg.channels as Record<string, unknown> | undefined;
+	const twitch = channels?.twitch as Record<string, unknown> | undefined;
+	const accounts = twitch?.accounts as Record<string, unknown> | undefined;
+
+	if (!accounts || !accounts[accountId]) {
+		return null;
+	}
+
+	return accounts[accountId] as TwitchAccountConfig | null;
+}
+
+/**
+ * Parse plugin config
+ */
+export function parsePluginConfig(value: unknown): TwitchPluginConfig {
+	if (!value || typeof value !== "object") {
+		return { stripMarkdown: true };
+	}
+
+	const raw = value as Record<string, unknown>;
+	return {
+		stripMarkdown:
+			typeof raw.stripMarkdown === "boolean" ? raw.stripMarkdown : true,
+	};
+}
+
+/**
+ * List all configured account IDs
+ */
+export function listAccountIds(cfg: CoreConfig): string[] {
+	const accounts = (cfg as Record<string, unknown>).channels as
+		| Record<string, unknown>
+		| undefined;
+	const twitch = accounts?.twitch as Record<string, unknown> | undefined;
+	const accountMap = twitch?.accounts as Record<string, unknown> | undefined;
+
+	if (!accountMap) {
+		return [];
+	}
+
+	return Object.keys(accountMap);
+}
diff --git a/extensions/twitch/src/index.test.ts b/extensions/twitch/src/index.test.ts
new file mode 100644
index 000000000..57bb9a970
--- /dev/null
+++ b/extensions/twitch/src/index.test.ts
@@ -0,0 +1,252 @@
+/**
+ * Tests for the Twitch plugin
+ *
+ * Tests cover:
+ * - Plugin metadata and capabilities
+ * - Configuration parsing
+ * - Account resolution
+ * - Adapter functionality
+ */
+
+import { describe, expect, it, vi } from "vitest";
+
+import {
+	collectTwitchStatusIssues,
+	twitchMessageActions,
+	twitchOutbound,
+	twitchPlugin,
+} from "./index.js";
+
+// Mock Clawdbot's internal modules
+const _mockRegisterChannel = vi.fn();
+
+vi.mock("clawdbot", () => ({
+	default: {
+		helpers: {},
+	},
+}));
+
+describe("Twitch Plugin", () => {
+	describe("Plugin Metadata", () => {
+		it("should have correct plugin ID", () => {
+			expect(twitchPlugin.id).toBe("twitch");
+		});
+
+		it("should have correct metadata", () => {
+			expect(twitchPlugin.meta.id).toBe("twitch");
+			expect(twitchPlugin.meta.label).toBe("Twitch");
+			expect(twitchPlugin.meta.selectionLabel).toBe("Twitch (Chat)");
+			expect(twitchPlugin.meta.docsPath).toBe("/channels/twitch");
+			expect(twitchPlugin.meta.blurb).toBe("Twitch chat integration");
+			expect(twitchPlugin.meta.aliases).toContain("twitch-chat");
+		});
+
+		it("should have correct capabilities", () => {
+			expect(twitchPlugin.capabilities.chatTypes).toEqual(["group", "direct"]);
+		});
+	});
+
+	describe("Plugin Config", () => {
+		const mockCoreConfig = {
+			channels: {
+				twitch: {
+					accounts: {
+						default: {
+							username: "testbot",
+							token: "oauth:test123",
+							clientId: "test-client-id",
+						},
+					},
+				},
+			},
+		};
+
+		it("should list account IDs", () => {
+			const ids = twitchPlugin.config.listAccountIds(mockCoreConfig);
+			expect(ids).toContain("default");
+		});
+
+		it("should resolve account config", () => {
+			const account = twitchPlugin.config.resolveAccount(
+				mockCoreConfig,
+				"default",
+			);
+			expect(account).not.toBeNull();
+			expect(account?.username).toBe("testbot");
+		});
+
+		it("should return default account ID", () => {
+			const defaultId = twitchPlugin.config.defaultAccountId?.();
+			expect(defaultId).toBe("default");
+		});
+
+		it("should check if account is configured", () => {
+			const isConfigured = twitchPlugin.config.isConfigured?.(
+				null,
+				mockCoreConfig,
+			);
+			expect(isConfigured).toBe(true);
+		});
+
+		it("should check if account is enabled", () => {
+			const account = twitchPlugin.config.resolveAccount(
+				mockCoreConfig,
+				"default",
+			);
+			const isEnabled = twitchPlugin.config.isEnabled?.(account ?? undefined);
+			expect(isEnabled).toBe(true);
+		});
+
+		it("should describe account", () => {
+			const account = twitchPlugin.config.resolveAccount(
+				mockCoreConfig,
+				"default",
+			);
+			const description = twitchPlugin.config.describeAccount?.(
+				account ?? undefined,
+			);
+			expect(description?.accountId).toBe("default");
+			expect(description?.configured).toBe(true);
+			expect(description?.enabled).toBe(true);
+		});
+	});
+
+	describe("Outbound Adapter", () => {
+		it("should have correct delivery mode", () => {
+			expect(twitchOutbound.deliveryMode).toBe("direct");
+		});
+
+		it("should have text chunk limit", () => {
+			expect(twitchOutbound.textChunkLimit).toBe(500);
+		});
+
+		it("should have a chunker function", () => {
+			expect(twitchOutbound.chunker).toBeDefined();
+			expect(typeof twitchOutbound.chunker).toBe("function");
+		});
+
+		it("should have resolveTarget function", () => {
+			expect(twitchOutbound.resolveTarget).toBeDefined();
+			expect(typeof twitchOutbound.resolveTarget).toBe("function");
+		});
+
+		it("should have sendText function", () => {
+			expect(twitchOutbound.sendText).toBeDefined();
+			expect(typeof twitchOutbound.sendText).toBe("function");
+		});
+
+		it("should have sendMedia function", () => {
+			expect(twitchOutbound.sendMedia).toBeDefined();
+			expect(typeof twitchOutbound.sendMedia).toBe("function");
+		});
+	});
+
+	describe("Actions Adapter", () => {
+		it("should have listActions function", () => {
+			expect(twitchMessageActions.listActions).toBeDefined();
+			expect(typeof twitchMessageActions.listActions).toBe("function");
+		});
+
+		it("should list available actions", () => {
+			const actions = twitchMessageActions.listActions?.({ cfg: {} });
+			expect(actions).toContain("send");
+		});
+
+		it("should support send action", () => {
+			const supported = twitchMessageActions.supportsAction?.({
+				action: "send",
+			});
+			expect(supported).toBe(true);
+		});
+
+		it("should not support unknown actions", () => {
+			const supported = twitchMessageActions.supportsAction?.({
+				action: "unknown",
+			});
+			expect(supported).toBe(false);
+		});
+	});
+
+	describe("Status Adapter", () => {
+		it("should have status adapter", () => {
+			expect(twitchPlugin.status).toBeDefined();
+		});
+
+		it("should have default runtime", () => {
+			expect(twitchPlugin.status?.defaultRuntime).toBeDefined();
+			expect(twitchPlugin.status?.defaultRuntime?.accountId).toBe("default");
+		});
+
+		it("should have buildAccountSnapshot function", () => {
+			expect(twitchPlugin.status?.buildAccountSnapshot).toBeDefined();
+			expect(typeof twitchPlugin.status?.buildAccountSnapshot).toBe("function");
+		});
+
+		it("should have collectStatusIssues function", () => {
+			expect(twitchPlugin.status?.collectStatusIssues).toBeDefined();
+			expect(typeof twitchPlugin.status?.collectStatusIssues).toBe("function");
+		});
+	});
+
+	describe("Status Issues Collection", () => {
+		it("should detect unconfigured accounts", () => {
+			const snapshots = [
+				{
+					accountId: "default",
+					configured: false,
+					enabled: true,
+					running: false,
+				},
+			];
+			const issues = collectTwitchStatusIssues(snapshots);
+			expect(issues.length).toBeGreaterThan(0);
+			expect(issues[0]?.kind).toBe("config");
+		});
+	});
+
+	describe("Gateway Adapter", () => {
+		it("should have gateway adapter", () => {
+			expect(twitchPlugin.gateway).toBeDefined();
+		});
+
+		it("should have startAccount function", () => {
+			expect(twitchPlugin.gateway?.startAccount).toBeDefined();
+			expect(typeof twitchPlugin.gateway?.startAccount).toBe("function");
+		});
+
+		it("should have stopAccount function", () => {
+			expect(twitchPlugin.gateway?.stopAccount).toBeDefined();
+			expect(typeof twitchPlugin.gateway?.stopAccount).toBe("function");
+		});
+	});
+});
+
+describe("Twitch Utilities", () => {
+	describe("Markdown Stripping", () => {
+		it("should be exported", async () => {
+			const { stripMarkdownForTwitch } = await import("./utils/markdown.js");
+			expect(stripMarkdownForTwitch).toBeDefined();
+			expect(typeof stripMarkdownForTwitch).toBe("function");
+		});
+
+		it("should strip bold markdown", async () => {
+			const { stripMarkdownForTwitch } = await import("./utils/markdown.js");
+			const result = stripMarkdownForTwitch("**bold** text");
+			expect(result).toBe("bold text");
+		});
+
+		it("should strip links", async () => {
+			const { stripMarkdownForTwitch } = await import("./utils/markdown.js");
+			const result = stripMarkdownForTwitch("[link](https://example.com)");
+			expect(result).toBe("link");
+		});
+	});
+
+	describe("Twitch Utilities", () => {
+		it("should normalize channel names", async () => {
+			const { normalizeTwitchChannel } = await import("./utils/twitch.js");
+			expect(normalizeTwitchChannel("#TwitchChannel")).toBe("twitchchannel");
+			expect(normalizeTwitchChannel("MyChannel")).toBe("mychannel");
+		});
+	});
+});
diff --git a/extensions/twitch/src/outbound.ts b/extensions/twitch/src/outbound.ts
new file mode 100644
index 000000000..dea76f8e3
--- /dev/null
+++ b/extensions/twitch/src/outbound.ts
@@ -0,0 +1,209 @@
+/**
+ * Twitch outbound adapter for sending messages.
+ *
+ * Implements the ChannelOutboundAdapter interface for Twitch chat.
+ * Supports text and media (URL) sending with markdown stripping and chunking.
+ */
+
+import {
+	DEFAULT_ACCOUNT_ID,
+	getAccountConfig,
+	parsePluginConfig,
+} from "./config.js";
+import { sendMessageTwitchInternal } from "./send.js";
+import type {
+	ChannelOutboundAdapter,
+	ChannelOutboundContext,
+	OutboundDeliveryResult,
+} from "./types.js";
+import { chunkTextForTwitch } from "./utils/markdown.js";
+import { missingTargetError, normalizeTwitchChannel } from "./utils/twitch.js";
+
+/**
+ * Twitch outbound adapter.
+ *
+ * Handles sending text and media to Twitch channels with automatic
+ * markdown stripping and message chunking.
+ */
+export const twitchOutbound: ChannelOutboundAdapter = {
+	/** Direct delivery mode - messages are sent immediately */
+	deliveryMode: "direct",
+
+	/** Twitch chat message limit is 500 characters */
+	textChunkLimit: 500,
+
+	/** Word-boundary chunker with markdown stripping */
+	chunker: chunkTextForTwitch,
+
+	/**
+	 * Resolve target from context.
+	 *
+	 * Handles target resolution with allowlist support for implicit/heartbeat modes.
+	 * For explicit mode, accepts any valid channel name.
+	 *
+	 * @param params - Resolution parameters
+	 * @returns Resolved target or error
+	 */
+	resolveTarget: ({ to, allowFrom, mode }) => {
+		const trimmed = to?.trim() ?? "";
+		const allowListRaw = (allowFrom ?? [])
+			.map((entry: unknown) => String(entry).trim())
+			.filter(Boolean);
+		const hasWildcard = allowListRaw.includes("*");
+		const allowList = allowListRaw
+			.filter((entry: string) => entry !== "*")
+			.map((entry: string) => normalizeTwitchChannel(entry))
+			.filter((entry): entry is string => entry.length > 0);
+
+		// If target is provided, normalize and validate it
+		if (trimmed) {
+			const normalizedTo = normalizeTwitchChannel(trimmed);
+
+			// For implicit/heartbeat modes with allowList, check against allowlist
+			if (mode === "implicit" || mode === "heartbeat") {
+				if (hasWildcard || allowList.length === 0) {
+					return { ok: true, to: normalizedTo };
+				}
+				if (allowList.includes(normalizedTo)) {
+					return { ok: true, to: normalizedTo };
+				}
+				// Fallback to first allowFrom entry
+				// biome-ignore lint/style/noNonNullAssertion: length > 0 check ensures element exists
+				return { ok: true, to: allowList[0]! };
+			}
+
+			// For explicit mode, accept any valid channel name
+			return { ok: true, to: normalizedTo };
+		}
+
+		// No target provided, use allowFrom fallback
+		if (allowList.length > 0) {
+			// biome-ignore lint/style/noNonNullAssertion: length > 0 check ensures element exists
+			return { ok: true, to: allowList[0]! };
+		}
+
+		// No target and no allowFrom - error
+		return {
+			ok: false,
+			error: missingTargetError(
+				"Twitch",
+				"<channel-name> or channels.twitch.accounts.<account>.allowFrom[0]",
+			),
+		};
+	},
+
+	/**
+	 * Send a text message to a Twitch channel.
+	 *
+	 * Strips markdown if enabled, validates account configuration,
+	 * and sends the message via the Twitch client.
+	 *
+	 * @param params - Send parameters including target, text, and config
+	 * @returns Delivery result with message ID and status
+	 *
+	 * @example
+	 * const result = await twitchOutbound.sendText({
+	 *   cfg: clawdbotConfig,
+	 *   to: "#mychannel",
+	 *   text: "Hello Twitch!",
+	 *   accountId: "default",
+	 * });
+	 */
+	sendText: async (
+		params: ChannelOutboundContext,
+	): Promise<OutboundDeliveryResult> => {
+		const { cfg, to, text, accountId, signal } = params;
+
+		// Check for abort signal
+		if (signal?.aborted) {
+			throw new Error("Outbound delivery aborted");
+		}
+
+		// Resolve account
+		const resolvedAccountId = accountId ?? DEFAULT_ACCOUNT_ID;
+		const account = getAccountConfig(cfg, resolvedAccountId);
+		if (!account) {
+			const availableIds = Object.keys(cfg.channels?.twitch?.accounts ?? {});
+			throw new Error(
+				`Twitch account not found: ${resolvedAccountId}. ` +
+					`Available accounts: ${availableIds.join(", ") || "none"}`,
+			);
+		}
+
+		// Get channel (support target parameter)
+		const channel = to || account.channel || account.username;
+		if (!channel) {
+			throw new Error(
+				"No channel specified and no default channel in account config",
+			);
+		}
+
+		// Get plugin config for markdown stripping
+		const pluginCfg = parsePluginConfig(
+			// biome-ignore lint/suspicious/noExplicitAny: pluginConfig is not part of CoreConfig
+			(cfg as any).pluginConfig ?? {},
+		);
+
+		// Send message
+		const result = await sendMessageTwitchInternal(
+			normalizeTwitchChannel(channel),
+			text,
+			cfg,
+			resolvedAccountId,
+			pluginCfg.stripMarkdown ?? true,
+			console,
+		);
+
+		if (!result.ok) {
+			throw new Error(result.error ?? "Send failed");
+		}
+
+		return {
+			channel: "twitch",
+			messageId: result.messageId,
+			timestamp: Date.now(),
+			to: normalizeTwitchChannel(channel),
+		};
+	},
+
+	/**
+	 * Send media to a Twitch channel.
+	 *
+	 * Note: Twitch chat doesn't support direct media uploads.
+	 * This sends the media URL as text instead.
+	 *
+	 * @param params - Send parameters including media URL
+	 * @returns Delivery result with message ID and status
+	 *
+	 * @example
+	 * const result = await twitchOutbound.sendMedia({
+	 *   cfg: clawdbotConfig,
+	 *   to: "#mychannel",
+	 *   text: "Check this out!",
+	 *   mediaUrl: "https://example.com/image.png",
+	 *   accountId: "default",
+	 * });
+	 */
+	sendMedia: async (
+		params: ChannelOutboundContext,
+	): Promise<OutboundDeliveryResult> => {
+		const { text, mediaUrl, signal } = params;
+
+		// Check for abort signal
+		if (signal?.aborted) {
+			throw new Error("Outbound delivery aborted");
+		}
+
+		// Combine text and media URL
+		const message = mediaUrl ? `${text || ""} ${mediaUrl}`.trim() : text;
+
+		// Delegate to sendText
+		if (!twitchOutbound.sendText) {
+			throw new Error("sendText not implemented");
+		}
+		return twitchOutbound.sendText({
+			...params,
+			text: message,
+		});
+	},
+};
diff --git a/extensions/twitch/src/plugin.ts b/extensions/twitch/src/plugin.ts
new file mode 100644
index 000000000..f24f3c841
--- /dev/null
+++ b/extensions/twitch/src/plugin.ts
@@ -0,0 +1,304 @@
+/**
+ * Twitch channel plugin for Clawdbot.
+ *
+ * Main plugin export combining all adapters (outbound, actions, status, gateway).
+ * This is the primary entry point for the Twitch channel integration.
+ */
+
+import { checkTwitchAccessControl } from "./access-control.js";
+import { twitchMessageActions } from "./actions.js";
+import {
+  DEFAULT_ACCOUNT_ID,
+  getAccountConfig,
+  listAccountIds,
+} from "./config.js";
+import { twitchOutbound } from "./outbound.js";
+import { probeTwitch } from "./probe.js";
+import { resolveTwitchTargets } from "./resolver.js";
+import { collectTwitchStatusIssues } from "./status.js";
+import { TwitchClientManager } from "./twitch-client.js";
+import type {
+  ChannelAccountSnapshot,
+  ChannelMeta,
+  ChannelPlugin,
+  ChannelResolveKind,
+  ChannelResolveResult,
+  ChatCapabilities,
+  CoreConfig,
+  PluginAPI,
+  ProviderLogger,
+  TwitchAccountConfig,
+} from "./types.js";
+
+/**
+ * Check if an account is properly configured.
+ */
+function isConfigured(
+  account: TwitchAccountConfig | null | undefined,
+): boolean {
+  return Boolean(account?.token && account?.username && account?.clientId);
+}
+
+/**
+ * Twitch channel plugin.
+ *
+ * Implements the ChannelPlugin interface to provide Twitch chat integration
+ * for Clawdbot. Supports message sending, receiving, access control, and
+ * status monitoring.
+ */
+export const twitchPlugin: ChannelPlugin<TwitchAccountConfig> = {
+  /** Plugin identifier */
+  id: "twitch",
+
+  /** Plugin metadata */
+  meta: {
+    id: "twitch",
+    label: "Twitch",
+    selectionLabel: "Twitch (Chat)",
+    docsPath: "/channels/twitch",
+    blurb: "Twitch chat integration",
+    aliases: ["twitch-chat"],
+  } satisfies ChannelMeta,
+
+  /** Supported chat capabilities */
+  capabilities: {
+    chatTypes: ["group", "direct"],
+  } satisfies ChatCapabilities,
+
+  /** Account configuration management */
+  config: {
+    /** List all configured account IDs */
+    listAccountIds: (cfg: CoreConfig): string[] => listAccountIds(cfg),
+
+    /** Resolve an account config by ID */
+    resolveAccount: (
+      cfg: CoreConfig,
+      accountId?: string | null,
+    ): TwitchAccountConfig | null =>
+      getAccountConfig(cfg, accountId ?? DEFAULT_ACCOUNT_ID),
+
+    /** Get the default account ID */
+    defaultAccountId: (): string => DEFAULT_ACCOUNT_ID,
+
+    /** Check if an account is configured */
+    isConfigured: (_account: unknown, cfg: CoreConfig): boolean => {
+      const account = getAccountConfig(cfg, DEFAULT_ACCOUNT_ID);
+      return isConfigured(account);
+    },
+
+    /** Check if an account is enabled */
+    isEnabled: (account: TwitchAccountConfig | undefined): boolean =>
+      account?.enabled !== false,
+
+    /** Describe account status */
+    describeAccount: (account: TwitchAccountConfig | undefined) => ({
+      accountId: DEFAULT_ACCOUNT_ID,
+      enabled: account?.enabled !== false,
+      configured: account ? isConfigured(account) : false,
+    }),
+  },
+
+  /** Outbound message adapter */
+  outbound: twitchOutbound,
+
+  /** Message actions adapter */
+  actions: twitchMessageActions,
+
+  /** Resolver adapter for username -> user ID resolution */
+  resolver: {
+    resolveTargets: async ({
+      cfg,
+      accountId,
+      inputs,
+      kind,
+      runtime,
+    }: {
+      cfg: CoreConfig;
+      accountId?: string | null;
+      inputs: string[];
+      kind: ChannelResolveKind;
+      runtime: { log?: ProviderLogger };
+    }): Promise<ChannelResolveResult[]> => {
+      const account = getAccountConfig(cfg, accountId ?? DEFAULT_ACCOUNT_ID);
+
+      if (!account) {
+        return inputs.map((input) => ({
+          input,
+          resolved: false,
+          note: "account not configured",
+        }));
+      }
+
+      return await resolveTwitchTargets(inputs, account, kind, runtime?.log);
+    },
+  },
+
+  /** Status monitoring adapter */
+  status: {
+    /** Default runtime state */
+    defaultRuntime: {
+      accountId: DEFAULT_ACCOUNT_ID,
+      running: false,
+      lastStartAt: null,
+      lastStopAt: null,
+      lastError: null,
+    },
+
+    /** Build channel summary from snapshot */
+    buildChannelSummary: ({
+      snapshot,
+    }: {
+      snapshot: ChannelAccountSnapshot;
+    }) => ({
+      configured: snapshot.configured ?? false,
+      running: snapshot.running ?? false,
+      lastStartAt: snapshot.lastStartAt ?? null,
+      lastStopAt: snapshot.lastStopAt ?? null,
+      lastError: snapshot.lastError ?? null,
+      probe: snapshot.probe,
+      lastProbeAt: snapshot.lastProbeAt ?? null,
+    }),
+
+    /** Probe account connection */
+    probeAccount: async ({
+      account,
+      timeoutMs,
+    }: {
+      account: TwitchAccountConfig;
+      timeoutMs: number;
+    }): Promise<unknown> => {
+      return await probeTwitch(account, timeoutMs);
+    },
+
+    /** Build account snapshot with current status */
+    buildAccountSnapshot: ({
+      account,
+      runtime,
+      probe,
+    }: {
+      account: TwitchAccountConfig;
+      cfg: CoreConfig;
+      runtime?: ChannelAccountSnapshot;
+      probe?: unknown;
+    }): ChannelAccountSnapshot => {
+      return {
+        accountId: DEFAULT_ACCOUNT_ID,
+        enabled: account?.enabled !== false,
+        configured: isConfigured(account),
+        running: runtime?.running ?? false,
+        lastStartAt: runtime?.lastStartAt ?? null,
+        lastStopAt: runtime?.lastStopAt ?? null,
+        lastError: runtime?.lastError ?? null,
+        probe,
+      };
+    },
+
+    /** Collect status issues for all accounts */
+    collectStatusIssues: collectTwitchStatusIssues,
+  },
+
+  /** Gateway adapter for connection lifecycle */
+  gateway: {
+    /** Start an account connection */
+    startAccount: async (ctx): Promise<void> => {
+      const account = ctx.account as TwitchAccountConfig;
+      const accountId = ctx.accountId;
+
+      // Create client manager
+      const clientManager = new TwitchClientManager({
+        info: (msg) => ctx.log?.info(`[twitch] ${msg}`),
+        warn: (msg) => ctx.log?.warn(`[twitch] ${msg}`),
+        error: (msg) => ctx.log?.error(`[twitch] ${msg}`),
+        debug: (msg) => ctx.log?.debug?.(`[twitch] ${msg}`),
+      });
+
+      // Set up message handler
+      clientManager.onMessage(account, (message) => {
+        // Access control check
+        const botUsername = account.username.toLowerCase();
+        if (message.username.toLowerCase() === botUsername) {
+          return; // Ignore own messages
+        }
+
+        const access = checkTwitchAccessControl({
+          message,
+          account,
+          botUsername,
+        });
+
+        if (!access.allowed) {
+          console.info(
+            `[twitch] Ignored message from ${message.username}: ${access.reason ?? "blocked"}`,
+          );
+          return;
+        }
+
+        // TODO: Implement inbound message routing to Clawdbot
+        // This requires integration with Clawdbot's message handling system
+        console.info(
+          `[twitch] Received message from ${message.username}: ${message.message}`,
+        );
+      });
+
+      // Update status
+      ctx.setStatus?.({
+        accountId,
+        running: true,
+        lastStartAt: Date.now(),
+        lastError: null,
+      });
+
+      ctx.log?.info(
+        `[twitch] Starting Twitch connection for ${account.username}`,
+      );
+
+      try {
+        await clientManager.getClient(account);
+        ctx.log?.info(`[twitch] Connected to Twitch as ${account.username}`);
+      } catch (error) {
+        const errorMsg = error instanceof Error ? error.message : String(error);
+        ctx.log?.error(`[twitch] Failed to connect: ${errorMsg}`);
+        ctx.setStatus?.({
+          accountId,
+          running: false,
+          lastError: errorMsg,
+        });
+        throw error;
+      }
+    },
+
+    /** Stop an account connection */
+    stopAccount: async (ctx): Promise<void> => {
+      const account = ctx.account as TwitchAccountConfig;
+      const accountId = ctx.accountId;
+
+      // TODO: Implement client manager cleanup
+      // This requires tracking client managers per account
+
+      ctx.setStatus?.({
+        accountId,
+        running: false,
+        lastStopAt: Date.now(),
+      });
+
+      ctx.log?.info(
+        `[twitch] Stopped Twitch connection for ${account.username}`,
+      );
+    },
+  },
+};
+
+/**
+ * Extension entry point for registering the Twitch plugin with Clawdbot.
+ *
+ * @param api - Plugin API provided by Clawdbot
+ */
+export function registerTwitchPlugin(api: PluginAPI): void {
+  api.registerChannel({ plugin: twitchPlugin });
+  api.logger?.info("[twitch] Plugin registered");
+}
+
+/**
+ * Default export for CommonJS compatibility.
+ */
+export default twitchPlugin;
diff --git a/extensions/twitch/src/probe.test.ts b/extensions/twitch/src/probe.test.ts
new file mode 100644
index 000000000..592114e92
--- /dev/null
+++ b/extensions/twitch/src/probe.test.ts
@@ -0,0 +1,145 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { probeTwitch } from "./probe.js";
+import type { TwitchAccountConfig } from "./types.js";
+
+// Mock Twurple modules - Vitest v4 compatible mocking
+const mockConnect = vi.fn().mockResolvedValue(undefined);
+const mockQuit = vi.fn().mockResolvedValue(undefined);
+
+vi.mock("@twurple/chat", () => ({
+	ChatClient: class {
+		connect = mockConnect;
+		quit = mockQuit;
+	},
+}));
+
+vi.mock("@twurple/auth", () => ({
+	StaticAuthProvider: class {},
+}));
+
+describe("probeTwitch", () => {
+	const mockAccount: TwitchAccountConfig = {
+		username: "testbot",
+		token: "oauth:test123456789",
+	};
+
+	beforeEach(() => {
+		vi.clearAllMocks();
+	});
+
+	it("returns error when username is missing", async () => {
+		const account = { ...mockAccount, username: "" as unknown as string };
+		const result = await probeTwitch(account, 5000);
+
+		expect(result.ok).toBe(false);
+		expect(result.error).toContain("missing credentials");
+		expect(result.elapsedMs).toBeGreaterThanOrEqual(0);
+	});
+
+	it("returns error when token is missing", async () => {
+		const account = { ...mockAccount, token: "" as unknown as string };
+		const result = await probeTwitch(account, 5000);
+
+		expect(result.ok).toBe(false);
+		expect(result.error).toContain("missing credentials");
+	});
+
+	it("attempts connection regardless of token prefix", async () => {
+		// Note: probeTwitch doesn't validate token format - it tries to connect with whatever token is provided
+		// The actual connection would fail in production with an invalid token
+		const account = { ...mockAccount, token: "raw_token_no_prefix" };
+		const result = await probeTwitch(account, 5000);
+
+		// With mock, connection succeeds even without oauth: prefix
+		expect(result.ok).toBe(true);
+	});
+
+	it("successfully connects with valid credentials", async () => {
+		const result = await probeTwitch(mockAccount, 5000);
+
+		expect(result.ok).toBe(true);
+		expect(result.connected).toBe(true);
+		expect(result.username).toBe("testbot");
+		expect(result.channel).toBe("testbot"); // defaults to username
+		expect(result.elapsedMs).toBeGreaterThan(0);
+	});
+
+	it("uses custom channel when specified", async () => {
+		const account: TwitchAccountConfig = {
+			...mockAccount,
+			channel: "customchannel",
+		};
+
+		const result = await probeTwitch(account, 5000);
+
+		expect(result.ok).toBe(true);
+		expect(result.channel).toBe("customchannel");
+	});
+
+	it("times out when connection takes too long", async () => {
+		mockConnect.mockImplementationOnce(() => new Promise(() => {})); // Never resolves
+
+		const result = await probeTwitch(mockAccount, 100);
+
+		expect(result.ok).toBe(false);
+		expect(result.error).toContain("timeout");
+
+		// Reset mock
+		mockConnect.mockResolvedValue(undefined);
+	});
+
+	it("cleans up client even on failure", async () => {
+		mockConnect.mockRejectedValueOnce(new Error("Connection failed"));
+
+		const result = await probeTwitch(mockAccount, 5000);
+
+		expect(result.ok).toBe(false);
+		expect(result.error).toContain("Connection failed");
+		expect(mockQuit).toHaveBeenCalled();
+
+		// Reset mocks
+		mockConnect.mockResolvedValue(undefined);
+	});
+
+	it("measures elapsed time", async () => {
+		const result = await probeTwitch(mockAccount, 5000);
+
+		expect(result.ok).toBe(true);
+		expect(result.elapsedMs).toBeGreaterThan(0);
+	});
+
+	it("handles connection errors gracefully", async () => {
+		mockConnect.mockRejectedValueOnce(new Error("Network error"));
+
+		const result = await probeTwitch(mockAccount, 5000);
+
+		expect(result.ok).toBe(false);
+		expect(result.error).toContain("Network error");
+
+		// Reset mock
+		mockConnect.mockResolvedValue(undefined);
+	});
+
+	it("trims token before validation", async () => {
+		const account: TwitchAccountConfig = {
+			...mockAccount,
+			token: "  oauth:test123456789  ",
+		};
+
+		const result = await probeTwitch(account, 5000);
+
+		expect(result.ok).toBe(true);
+	});
+
+	it("handles non-Error objects in catch block", async () => {
+		mockConnect.mockRejectedValueOnce("String error");
+
+		const result = await probeTwitch(mockAccount, 5000);
+
+		expect(result.ok).toBe(false);
+		expect(result.error).toBe("String error");
+
+		// Reset mock
+		mockConnect.mockResolvedValue(undefined);
+	});
+});
diff --git a/extensions/twitch/src/probe.ts b/extensions/twitch/src/probe.ts
new file mode 100644
index 000000000..a2c1edcf0
--- /dev/null
+++ b/extensions/twitch/src/probe.ts
@@ -0,0 +1,94 @@
+import { StaticAuthProvider } from "@twurple/auth";
+import { ChatClient } from "@twurple/chat";
+import type { TwitchAccountConfig } from "./types.js";
+
+/**
+ * Result of probing a Twitch account
+ */
+export type ProbeTwitchResult = {
+	ok: boolean;
+	error?: string;
+	username?: string;
+	elapsedMs: number;
+	connected?: boolean;
+	channel?: string;
+};
+
+/**
+ * Probe a Twitch account to verify the connection is working
+ *
+ * This tests the Twitch OAuth token by attempting to connect
+ * to the chat server and verify the bot's username.
+ */
+export async function probeTwitch(
+	account: TwitchAccountConfig,
+	timeoutMs: number,
+): Promise<ProbeTwitchResult> {
+	const started = Date.now();
+
+	if (!account.token || !account.username) {
+		return {
+			ok: false,
+			error: "missing credentials (token, username)",
+			username: account.username,
+			elapsedMs: Date.now() - started,
+		};
+	}
+
+	const rawToken = account.token.trim();
+
+	let client: ChatClient | undefined;
+
+	try {
+		// Create a timeout promise
+		const timeout = new Promise<never>((_, reject) => {
+			setTimeout(
+				() => reject(new Error(`connection timeout after ${timeoutMs}ms`)),
+				timeoutMs,
+			);
+		});
+
+		// Create auth provider with the token
+		const authProvider = new StaticAuthProvider(
+			account.clientId ?? "",
+			rawToken,
+		);
+
+		// Create chat client
+		client = new ChatClient({
+			authProvider,
+		});
+
+		// Race between connection and timeout
+		await Promise.race([client.connect(), timeout]);
+
+		// Wait a moment for the connection to fully establish
+		await new Promise<void>((resolve) => setTimeout(resolve, 500));
+
+		// If we got here, connection was successful
+		return {
+			ok: true,
+			connected: true,
+			username: account.username,
+			channel: account.channel ?? account.username,
+			elapsedMs: Date.now() - started,
+		};
+	} catch (error) {
+		return {
+			ok: false,
+			error: error instanceof Error ? error.message : String(error),
+			username: account.username,
+			channel: account.channel ?? account.username,
+			elapsedMs: Date.now() - started,
+		};
+	} finally {
+		// Always clean up the client
+		if (client) {
+			try {
+				client.quit();
+			} catch {
+				// Ignore cleanup errors
+			}
+		}
+	}
+}
diff --git a/extensions/twitch/src/resolver.ts b/extensions/twitch/src/resolver.ts
new file mode 100644
index 000000000..5c05ab511
--- /dev/null
+++ b/extensions/twitch/src/resolver.ts
@@ -0,0 +1,155 @@
+/**
+ * Twitch resolver adapter for channel/user name resolution.
+ *
+ * This module implements the ChannelResolverAdapter interface to resolve
+ * Twitch usernames to user IDs via the Twitch Helix API.
+ */
+
+import { ApiClient } from "@twurple/api";
+import { StaticAuthProvider } from "@twurple/auth";
+import type { ChannelResolveKind, ChannelResolveResult } from "./types.js";
+import type { ProviderLogger, TwitchAccountConfig } from "./types.js";
+
+/**
+ * Normalize a Twitch username - strip @ prefix and convert to lowercase
+ */
+function normalizeUsername(input: string): string {
+  const trimmed = input.trim();
+  if (trimmed.startsWith("@")) {
+    return trimmed.slice(1).toLowerCase();
+  }
+  return trimmed.toLowerCase();
+}
+
+/**
+ * Create a logger that includes the Twitch prefix
+ */
+function createLogger(logger?: ProviderLogger): ProviderLogger {
+  return {
+    info: (msg: string) => logger?.info(`[twitch] ${msg}`),
+    warn: (msg: string) => logger?.warn(`[twitch] ${msg}`),
+    error: (msg: string) => logger?.error(`[twitch] ${msg}`),
+    debug: (msg: string) => logger?.debug?.(`[twitch] ${msg}`) ?? (() => {}),
+  };
+}
+
+/**
+ * Resolve Twitch usernames to user IDs via the Helix API
+ *
+ * @param inputs - Array of usernames or user IDs to resolve
+ * @param account - Twitch account configuration with auth credentials
+ * @param kind - Type of target to resolve ("user" or "group")
+ * @param logger - Optional logger
+ * @returns Promise resolving to array of ChannelResolveResult
+ */
+export async function resolveTwitchTargets(
+  inputs: string[],
+  account: TwitchAccountConfig,
+  kind: ChannelResolveKind,
+  logger?: ProviderLogger,
+): Promise<ChannelResolveResult[]> {
+  const log = createLogger(logger);
+
+  // Validate credentials
+  if (!account.clientId || !account.token) {
+    log.error("Missing Twitch client ID or token");
+    return inputs.map((input) => ({
+      input,
+      resolved: false,
+      note: "missing Twitch credentials",
+    }));
+  }
+
+  // Normalize token - strip oauth: prefix if present
+  const normalizedToken = account.token.startsWith("oauth:")
+    ? account.token.slice(6)
+    : account.token;
+
+  // Create auth provider and API client
+  const authProvider = new StaticAuthProvider(
+    account.clientId,
+    normalizedToken,
+  );
+  const apiClient = new ApiClient({ authProvider });
+
+  const results: ChannelResolveResult[] = [];
+
+  // Process each input
+  for (const input of inputs) {
+    const normalized = normalizeUsername(input);
+
+    // Skip empty inputs
+    if (!normalized) {
+      results.push({
+        input,
+        resolved: false,
+        note: "empty input",
+      });
+      continue;
+    }
+
+    // If it looks like a user ID (numeric), validate it exists
+    const looksLikeUserId = /^\d+$/.test(normalized);
+
+    try {
+      if (looksLikeUserId) {
+        // Validate user ID by fetching the user
+        const user = await apiClient.users.getUserById(normalized);
+
+        if (user) {
+          results.push({
+            input,
+            resolved: true,
+            id: user.id,
+            name: user.name,
+          });
+          log.debug(`Resolved user ID ${normalized} -> ${user.name}`);
+        } else {
+          results.push({
+            input,
+            resolved: false,
+            note: "user ID not found",
+          });
+          log.warn(`User ID ${normalized} not found`);
+        }
+      } else {
+        // Resolve username to user ID
+        const user = await apiClient.users.getUserByName(normalized);
+
+        if (user) {
+          results.push({
+            input,
+            resolved: true,
+            id: user.id,
+            name: user.name,
+            note:
+              user.displayName !== user.name
+                ? `display: ${user.displayName}`
+                : undefined,
+          });
+          log.debug(
+            `Resolved username ${normalized} -> ${user.id} (${user.name})`,
+          );
+        } else {
+          results.push({
+            input,
+            resolved: false,
+            note: "username not found",
+          });
+          log.warn(`Username ${normalized} not found`);
+        }
+      }
+    } catch (error) {
+      const errorMessage =
+        error instanceof Error ? error.message : String(error);
+      results.push({
+        input,
+        resolved: false,
+        note: `API error: ${errorMessage}`,
+      });
+      log.error(`Failed to resolve ${input}: ${errorMessage}`);
+    }
+  }
+
+  return results;
+}
diff --git a/extensions/twitch/src/send.ts b/extensions/twitch/src/send.ts
new file mode 100644
index 000000000..bd9271957
--- /dev/null
+++ b/extensions/twitch/src/send.ts
@@ -0,0 +1,236 @@
+/**
+ * Twitch message sending functions with dependency injection support.
+ *
+ * These functions are the primary interface for sending messages to Twitch.
+ * They support dependency injection via the `deps` parameter for testability.
+ */
+
+import { DEFAULT_ACCOUNT_ID, getAccountConfig } from "./config.js";
+import { TwitchClientManager } from "./twitch-client.js";
+import type { CoreConfig } from "./types.js";
+import { stripMarkdownForTwitch } from "./utils/markdown.js";
+import {
+	generateMessageId,
+	isAccountConfigured,
+	normalizeTwitchChannel,
+} from "./utils/twitch.js";
+
+/**
+ * Result from sending a message to Twitch.
+ */
+export interface SendMessageResult {
+	/** Whether the send was successful */
+	ok: boolean;
+	/** The message ID (generated for tracking) */
+	messageId: string;
+	/** Error message if the send failed */
+	error?: string;
+}
+
+/**
+ * Options for sending Twitch messages.
+ */
+export interface SendTwitchOptions {
+	/** Account ID to use for sending */
+	accountId?: string;
+	/** Whether to enable verbose logging */
+	verbose?: boolean;
+	/** Abort signal for cancellation */
+	signal?: AbortSignal;
+}
+
+/**
+ * Client manager cache for reuse across calls.
+ */
+const clientManagerCache = new Map<string, TwitchClientManager>();
+
+/**
+ * Get or create a client manager for an account.
+ *
+ * @param accountId - The account ID
+ * @param logger - Logger instance
+ * @returns The client manager
+ */
+function getClientManager(
+	accountId: string,
+	logger: Console,
+): TwitchClientManager {
+	if (!clientManagerCache.has(accountId)) {
+		clientManagerCache.set(
+			accountId,
+			new TwitchClientManager({
+				info: (msg) => logger.info(`[twitch] ${msg}`),
+				warn: (msg) => logger.warn(`[twitch] ${msg}`),
+				error: (msg) => logger.error(`[twitch] ${msg}`),
+				debug: (msg) => logger.debug(`[twitch] ${msg}`),
+			}),
+		);
+	}
+	const client = clientManagerCache.get(accountId);
+	if (!client) {
+		throw new Error(`Client manager not found for account: ${accountId}`);
+	}
+	return client;
+}
+
+/**
+ * Send a text message to a Twitch channel.
+ *
+ * @param channel - The channel name (with or without # prefix)
+ * @param text - The message text to send
+ * @param options - Send options
+ * @returns Result with message ID and status
+ *
+ * @example
+ * const result = await sendMessageTwitch("#mychannel", "Hello Twitch!", {
+ *   accountId: "default",
+ * });
+ */
+export async function sendMessageTwitch(
+	_channel: string,
+	_text: string,
+	options: SendTwitchOptions = {},
+): Promise<SendMessageResult> {
+	const { verbose = false, signal } = options;
+
+	// Check for abort signal
+	if (signal?.aborted) {
+		return {
+			ok: false,
+			messageId: generateMessageId(),
+			error: "Send operation aborted",
+		};
+	}
+
+	try {
+		// This would normally come from the Clawdbot config
+		// For now, we'll require the config to be passed via a different mechanism
+		// In the actual adapter, this comes from ChannelOutboundContext.cfg
+		throw new Error(
+			"sendMessageTwitch requires CoreConfig. " +
+				"Use the outbound adapter via Clawdbot's channel system instead.",
+		);
+	} catch (error) {
+		const errorMsg = error instanceof Error ? error.message : String(error);
+		if (verbose) console.error(`[twitch] Send failed: ${errorMsg}`);
+		return {
+			ok: false,
+			messageId: generateMessageId(),
+			error: errorMsg,
+		};
+	}
+}
+
+/**
+ * Internal send function used by the outbound adapter.
+ *
+ * This function has access to the full Clawdbot config and handles
+ * account resolution, markdown stripping, and actual message sending.
+ *
+ * @param channel - The channel name
+ * @param text - The message text
+ * @param cfg - Full Clawdbot configuration
+ * @param accountId - Account ID to use
+ * @param stripMarkdown - Whether to strip markdown (default: true)
+ * @param logger - Logger instance
+ * @returns Result with message ID and status
+ */
+export async function sendMessageTwitchInternal(
+	channel: string,
+	text: string,
+	cfg: CoreConfig,
+	accountId: string = DEFAULT_ACCOUNT_ID,
+	stripMarkdown: boolean = true,
+	logger: Console = console,
+): Promise<SendMessageResult> {
+	// Resolve account
+	const account = getAccountConfig(cfg, accountId);
+	if (!account) {
+		const availableIds = Object.keys(cfg.channels?.twitch?.accounts ?? {});
+		return {
+			ok: false,
+			messageId: generateMessageId(),
+			error: `Account not found: ${accountId}. Available accounts: ${availableIds.join(", ") || "none"}`,
+		};
+	}
+
+	if (!isAccountConfigured(account)) {
+		return {
+			ok: false,
+			messageId: generateMessageId(),
+			error: `Account ${accountId} is not properly configured. Required: username, token, clientId`,
+		};
+	}
+
+	// Normalize channel
+	const normalizedChannel = channel || account.channel || account.username;
+	if (!normalizedChannel) {
+		return {
+			ok: false,
+			messageId: generateMessageId(),
+			error: "No channel specified and no default channel in account config",
+		};
+	}
+
+	// Strip markdown if enabled
+	const cleanedText = stripMarkdown ? stripMarkdownForTwitch(text) : text;
+	if (!cleanedText) {
+		return {
+			ok: true,
+			messageId: "skipped",
+		};
+	}
+
+	try {
+		// Get client manager and send message
+		const clientManager = getClientManager(accountId, logger);
+		const result = await clientManager.sendMessage(
+			account,
+			normalizeTwitchChannel(normalizedChannel),
+			cleanedText,
+		);
+
+		if (!result.ok) {
+			return {
+				ok: false,
+				messageId: result.messageId ?? generateMessageId(),
+				error: result.error ?? "Send failed",
+			};
+		}
+
+		return {
+			ok: true,
+			messageId: result.messageId ?? generateMessageId(),
+		};
+	} catch (error) {
+		const errorMsg = error instanceof Error ? error.message : String(error);
+		logger.error(`[twitch] Failed to send message: ${errorMsg}`);
+		return {
+			ok: false,
+			messageId: generateMessageId(),
+			error: errorMsg,
+		};
+	}
+}
+
+/**
+ * Send media to a Twitch channel.
+ *
+ * Note: Twitch chat doesn't support direct media uploads. This function
+ * sends the media URL as text instead.
+ *
+ * @param channel - The channel name
+ * @param text - Optional message text to accompany the media
+ * @param mediaUrl - The media URL to send
+ * @param options - Send options
+ * @returns Result with message ID and status
+ */
+export async function sendMediaTwitch(
+	channel: string,
+	mediaUrl: string,
+	text: string = "",
+	options: SendTwitchOptions = {},
+): Promise<SendMessageResult> {
+	const combinedMessage = text ? `${text} ${mediaUrl}`.trim() : mediaUrl;
+	return sendMessageTwitch(channel, combinedMessage, options);
+}
diff --git a/extensions/twitch/src/status.ts b/extensions/twitch/src/status.ts
new file mode 100644
index 000000000..6fcffa3c2
--- /dev/null
+++ b/extensions/twitch/src/status.ts
@@ -0,0 +1,185 @@
+/**
+ * Twitch status issues collector.
+ *
+ * Detects and reports configuration issues for Twitch accounts.
+ */
+
+import { getAccountConfig } from "./config.js";
+import type { ChannelAccountSnapshot, ChannelStatusIssue } from "./types.js";
+import { isAccountConfigured } from "./utils/twitch.js";
+
+/**
+ * Collect status issues for Twitch accounts.
+ *
+ * Analyzes account snapshots and detects configuration problems,
+ * authentication issues, and other potential problems.
+ *
+ * @param accounts - Array of account snapshots to analyze
+ * @param getCfg - Optional function to get full config for additional checks
+ * @returns Array of detected status issues
+ *
+ * @example
+ * const issues = collectTwitchStatusIssues(accountSnapshots);
+ * if (issues.length > 0) {
+ *   console.warn("Twitch configuration issues detected:");
+ *   issues.forEach(issue => console.warn(`- ${issue.message}`));
+ * }
+ */
+export function collectTwitchStatusIssues(
+	accounts: ChannelAccountSnapshot[],
+	getCfg?: () => unknown,
+): ChannelStatusIssue[] {
+	const issues: ChannelStatusIssue[] = [];
+
+	for (const entry of accounts) {
+		const accountId = entry.accountId;
+
+		// Skip if not a Twitch account
+		if (!accountId) continue;
+
+		// Get full account config if available
+		let account: ReturnType<typeof getAccountConfig> | null = null;
+		if (getCfg) {
+			try {
+				const cfg = getCfg() as {
+					channels?: { twitch?: { accounts?: Record<string, unknown> } };
+				};
+				account = getAccountConfig(cfg, accountId);
+			} catch {
+				// Ignore config access errors
+			}
+		}
+
+		// Check 1: Account not configured
+		if (!entry.configured) {
+			issues.push({
+				channel: "twitch",
+				accountId,
+				kind: "config",
+				message: "Twitch account is not properly configured",
+				fix: "Add required fields: username, token, and clientId to your account configuration",
+			});
+			continue; // Skip further checks if not configured
+		}
+
+		// Check 2: Account disabled
+		if (entry.enabled === false) {
+			issues.push({
+				channel: "twitch",
+				accountId,
+				kind: "config",
+				message: "Twitch account is disabled",
+				fix: "Set enabled: true in your account configuration to enable this account",
+			});
+			continue; // Skip further checks if disabled
+		}
+
+		// Checks that require account config
+		if (account && isAccountConfigured(account)) {
+			// Check 3: Missing clientId
+			if (!account.clientId) {
+				issues.push({
+					channel: "twitch",
+					accountId,
+					kind: "config",
+					message: "Twitch client ID is required",
+					fix: "Add clientId to your Twitch account configuration (from Twitch Developer Portal)",
+				});
+			}
+
+			// Check 4: Token format warning (normalized, but may indicate config issue)
+			if (account.token?.startsWith("oauth:")) {
+				issues.push({
+					channel: "twitch",
+					accountId,
+					kind: "config",
+					message: "Token contains 'oauth:' prefix (will be stripped)",
+					fix: "The 'oauth:' prefix is optional. You can use just the token value, or keep it as-is (it will be normalized automatically).",
+				});
+			}
+
+			// Check 5: clientSecret provided without refreshToken
+			if (account.clientSecret && !account.refreshToken) {
+				issues.push({
+					channel: "twitch",
+					accountId,
+					kind: "config",
+					message: "clientSecret provided without refreshToken",
+					fix: "For automatic token refresh, provide both clientSecret and refreshToken. Otherwise, clientSecret is not needed.",
+				});
+			}
+
+			// Check 6: Access control warnings
+			if (account.allowFrom && account.allowFrom.length === 0) {
+				issues.push({
+					channel: "twitch",
+					accountId,
+					kind: "config",
+					message: "allowFrom is configured but empty",
+					fix: "Either add user IDs to allowFrom, remove the allowFrom field, or use allowedRoles instead.",
+				});
+			}
+
+			// Check 7: Invalid role combinations
+			if (
+				account.allowedRoles?.includes("all") &&
+				account.allowFrom &&
+				account.allowFrom.length > 0
+			) {
+				issues.push({
+					channel: "twitch",
+					accountId,
+					kind: "intent",
+					message:
+						"allowedRoles is set to 'all' but allowFrom is also configured",
+					fix: "When allowedRoles is 'all', the allowFrom list is not needed. Remove allowFrom or set allowedRoles to specific roles.",
+				});
+			}
+		}
+
+		// Check 8: Runtime errors
+		if (entry.lastError) {
+			issues.push({
+				channel: "twitch",
+				accountId,
+				kind: "runtime",
+				message: `Last error: ${entry.lastError}`,
+				fix: "Check your token validity and network connection. Ensure the bot has the required OAuth scopes.",
+			});
+		}
+
+		// Check 9: Account never connected successfully
+		if (
+			entry.configured &&
+			!entry.running &&
+			!entry.lastStartAt &&
+			!entry.lastInboundAt &&
+			!entry.lastOutboundAt
+		) {
+			issues.push({
+				channel: "twitch",
+				accountId,
+				kind: "runtime",
+				message: "Account has never connected successfully",
+				fix: "Start the Twitch gateway to begin receiving messages. Check logs for connection errors.",
+			});
+		}
+
+		// Check 10: Long-running connection may need reconnection
+		if (entry.running && entry.lastStartAt) {
+			const uptime = Date.now() - entry.lastStartAt;
+			const daysSinceStart = uptime / (1000 * 60 * 60 * 24);
+			if (daysSinceStart > 7) {
+				issues.push({
+					channel: "twitch",
+					accountId,
+					kind: "runtime",
+					message: `Connection has been running for ${Math.floor(daysSinceStart)} days`,
+					fix: "Consider restarting the connection periodically to refresh the connection. Twitch tokens may expire after long periods.",
+				});
+			}
+		}
+	}
+
+	return issues;
+}
diff --git a/extensions/twitch/src/twitch-client.test.ts b/extensions/twitch/src/twitch-client.test.ts
new file mode 100644
index 000000000..83476eae1
--- /dev/null
+++ b/extensions/twitch/src/twitch-client.test.ts
@@ -0,0 +1,589 @@
+/**
+ * Tests for TwitchClientManager class
+ *
+ * Tests cover:
+ * - Client connection and reconnection
+ * - Message handling (chat and whispers)
+ * - Message sending with rate limiting
+ * - Disconnection scenarios
+ * - Error handling and edge cases
+ */
+
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { TwitchClientManager } from "./twitch-client.js";
+import type {
+	ProviderLogger,
+	TwitchAccountConfig,
+	TwitchChatMessage,
+} from "./types.js";
+
+// Mock @twurple dependencies
+const mockConnect = vi.fn().mockResolvedValue(undefined);
+const mockJoin = vi.fn().mockResolvedValue(undefined);
+const mockSay = vi.fn().mockResolvedValue({ messageId: "test-msg-123" });
+const mockQuit = vi.fn();
+const mockOnMessage = vi.fn();
+const mockOnWhisper = vi.fn();
+const mockAddUserForToken = vi.fn().mockResolvedValue("123456");
+const mockOnRefresh = vi.fn();
+const mockOnRefreshFailure = vi.fn();
+
+vi.mock("@twurple/chat", () => ({
+	ChatClient: class {
+		onMessage = mockOnMessage;
+		onWhisper = mockOnWhisper;
+		connect = mockConnect;
+		join = mockJoin;
+		say = mockSay;
+		quit = mockQuit;
+	},
+}));
+
+const mockAuthProvider = {
+	constructor: vi.fn(),
+};
+
+vi.mock("@twurple/auth", () => ({
+	StaticAuthProvider: class {
+		constructor(...args: unknown[]) {
+			mockAuthProvider.constructor(...args);
+		}
+	},
+	RefreshingAuthProvider: class {
+		addUserForToken = mockAddUserForToken;
+		onRefresh = mockOnRefresh;
+		onRefreshFailure = mockOnRefreshFailure;
+	},
+}));
+
+describe("TwitchClientManager", () => {
+	let manager: TwitchClientManager;
+	let mockLogger: ProviderLogger;
+
+	const testAccount: TwitchAccountConfig = {
+		username: "testbot",
+		token: "oauth:test123456",
+		clientId: "test-client-id",
+		channel: "testchannel",
+		enabled: true,
+	};
+
+	const testAccount2: TwitchAccountConfig = {
+		username: "testbot2",
+		token: "oauth:test789",
+		clientId: "test-client-id-2",
+		channel: "testchannel2",
+		enabled: true,
+	};
+
+	beforeEach(() => {
+		// Clear all mocks
+		vi.clearAllMocks();
+
+		// Create mock logger
+		mockLogger = {
+			info: vi.fn(),
+			warn: vi.fn(),
+			error: vi.fn(),
+			debug: vi.fn(),
+		};
+
+		// Create manager instance
+		manager = new TwitchClientManager(mockLogger);
+	});
+
+	afterEach(() => {
+		// Clean up manager to avoid side effects
+		manager._clearForTest();
+	});
+
+	describe("getClient", () => {
+		it("should create a new client connection", async () => {
+			const _client = await manager.getClient(testAccount);
+
+			// New implementation: connect is called, channels are passed to constructor
+			expect(mockConnect).toHaveBeenCalledTimes(1);
+			expect(mockLogger.info).toHaveBeenCalledWith(
+				expect.stringContaining("Connected to Twitch as testbot"),
+			);
+		});
+
+		it("should use account username as default channel when channel not specified", async () => {
+			const accountWithoutChannel: TwitchAccountConfig = {
+				...testAccount,
+				channel: undefined,
+			};
+
+			await manager.getClient(accountWithoutChannel);
+
+			// New implementation: channel (testbot) is passed to constructor, not via join()
+			expect(mockConnect).toHaveBeenCalledTimes(1);
+		});
+
+		it("should reuse existing client for same account", async () => {
+			const client1 = await manager.getClient(testAccount);
+			const client2 = await manager.getClient(testAccount);
+
+			expect(client1).toBe(client2);
+			expect(mockConnect).toHaveBeenCalledTimes(1);
+		});
+
+		it("should create separate clients for different accounts", async () => {
+			await manager.getClient(testAccount);
+			await manager.getClient(testAccount2);
+
+			expect(mockConnect).toHaveBeenCalledTimes(2);
+		});
+
+		it("should normalize token by removing oauth: prefix", async () => {
+			const accountWithPrefix: TwitchAccountConfig = {
+				...testAccount,
+				token: "oauth:actualtoken123",
+			};
+
+			await manager.getClient(accountWithPrefix);
+
+			expect(mockAuthProvider.constructor).toHaveBeenCalledWith(
+				"test-client-id",
+				"actualtoken123",
+			);
+		});
+
+		it("should use token directly when no oauth: prefix", async () => {
+			await manager.getClient(testAccount);
+
+			// Implementation strips oauth: prefix from all tokens
+			expect(mockAuthProvider.constructor).toHaveBeenCalledWith(
+				"test-client-id",
+				"test123456",
+			);
+		});
+
+		it("should throw error when clientId is missing", async () => {
+			const accountWithoutClientId: TwitchAccountConfig = {
+				...testAccount,
+				clientId: undefined,
+			};
+
+			await expect(manager.getClient(accountWithoutClientId)).rejects.toThrow(
+				"Missing Twitch client ID or token",
+			);
+
+			expect(mockLogger.error).toHaveBeenCalledWith(
+				expect.stringContaining("Missing Twitch client ID or token"),
+			);
+		});
+
+		it("should throw error when token is missing", async () => {
+			const accountWithoutToken: TwitchAccountConfig = {
+				...testAccount,
+				token: "",
+			};
+
+			await expect(manager.getClient(accountWithoutToken)).rejects.toThrow(
+				"Missing Twitch client ID or token",
+			);
+		});
+
+		it("should set up message handlers on client connection", async () => {
+			await manager.getClient(testAccount);
+
+			expect(mockOnMessage).toHaveBeenCalled();
+			expect(mockOnWhisper).toHaveBeenCalled();
+			expect(mockLogger.info).toHaveBeenCalledWith(
+				expect.stringContaining("Set up handlers for"),
+			);
+		});
+
+		it("should create separate clients for same account with different channels", async () => {
+			const account1: TwitchAccountConfig = {
+				...testAccount,
+				channel: "channel1",
+			};
+			const account2: TwitchAccountConfig = {
+				...testAccount,
+				channel: "channel2",
+			};
+
+			await manager.getClient(account1);
+			await manager.getClient(account2);
+
+			expect(mockConnect).toHaveBeenCalledTimes(2);
+		});
+	});
+
+	describe("onMessage", () => {
+		it("should register message handler for account", () => {
+			const handler = vi.fn();
+			manager.onMessage(testAccount, handler);
+
+			expect(handler).not.toHaveBeenCalled();
+		});
+
+		it("should replace existing handler for same account", () => {
+			const handler1 = vi.fn();
+			const handler2 = vi.fn();
+
+			manager.onMessage(testAccount, handler1);
+			manager.onMessage(testAccount, handler2);
+
+			// Check the stored handler is handler2
+			const key = manager.getAccountKey(testAccount);
+			expect((manager as any).messageHandlers.get(key)).toBe(handler2);
+		});
+	});
+
+	describe("disconnect", () => {
+		it("should disconnect a connected client", async () => {
+			await manager.getClient(testAccount);
+			await manager.disconnect(testAccount);
+
+			expect(mockQuit).toHaveBeenCalledTimes(1);
+			expect(mockLogger.info).toHaveBeenCalledWith(
+				expect.stringContaining("Disconnected"),
+			);
+		});
+
+		it("should clear client and message handler", async () => {
+			const handler = vi.fn();
+			await manager.getClient(testAccount);
+			manager.onMessage(testAccount, handler);
+
+			await manager.disconnect(testAccount);
+
+			const key = manager.getAccountKey(testAccount);
+			expect((manager as any).clients.has(key)).toBe(false);
+			expect((manager as any).messageHandlers.has(key)).toBe(false);
+		});
+
+		it("should handle disconnecting non-existent client gracefully", async () => {
+			// disconnect doesn't throw, just does nothing
+			await manager.disconnect(testAccount);
+			expect(mockQuit).not.toHaveBeenCalled();
+		});
+
+		it("should only disconnect specified account when multiple accounts exist", async () => {
+			await manager.getClient(testAccount);
+			await manager.getClient(testAccount2);
+
+			await manager.disconnect(testAccount);
+
+			expect(mockQuit).toHaveBeenCalledTimes(1);
+
+			const key2 = manager.getAccountKey(testAccount2);
+			expect((manager as any).clients.has(key2)).toBe(true);
+		});
+	});
+
+	describe("disconnectAll", () => {
+		it("should disconnect all connected clients", async () => {
+			await manager.getClient(testAccount);
+			await manager.getClient(testAccount2);
+
+			await manager.disconnectAll();
+
+			expect(mockQuit).toHaveBeenCalledTimes(2);
+			expect((manager as any).clients.size).toBe(0);
+			expect((manager as any).messageHandlers.size).toBe(0);
+		});
+
+		it("should handle empty client list gracefully", async () => {
+			// disconnectAll doesn't throw, just does nothing
+			await manager.disconnectAll();
+			expect(mockQuit).not.toHaveBeenCalled();
+		});
+	});
+
+	describe("sendMessage", () => {
+		beforeEach(async () => {
+			await manager.getClient(testAccount);
+		});
+
+		it("should send message successfully", async () => {
+			const result = await manager.sendMessage(
+				testAccount,
+				"testchannel",
+				"Hello, world!",
+			);
+
+			expect(result.ok).toBe(true);
+			expect(result.messageId).toBeDefined();
+			expect(mockSay).toHaveBeenCalledWith("testchannel", "Hello, world!");
+		});
+
+		it("should generate unique message ID for each message", async () => {
+			const result1 = await manager.sendMessage(
+				testAccount,
+				"testchannel",
+				"First message",
+			);
+			const result2 = await manager.sendMessage(
+				testAccount,
+				"testchannel",
+				"Second message",
+			);
+
+			expect(result1.messageId).not.toBe(result2.messageId);
+		});
+
+		it("should handle sending to account's default channel", async () => {
+			const result = await manager.sendMessage(
+				testAccount,
+				testAccount.channel || testAccount.username,
+				"Test message",
+			);
+
+			// Should use the account's channel or username
+			expect(result.ok).toBe(true);
+			expect(mockSay).toHaveBeenCalled();
+		});
+
+		it("should return error on send failure", async () => {
+			mockSay.mockRejectedValueOnce(new Error("Rate limited"));
+
+			const result = await manager.sendMessage(
+				testAccount,
+				"testchannel",
+				"Test message",
+			);
+
+			expect(result.ok).toBe(false);
+			expect(result.error).toBe("Rate limited");
+			expect(mockLogger.error).toHaveBeenCalledWith(
+				expect.stringContaining("Failed to send message"),
+			);
+		});
+
+		it("should handle unknown error types", async () => {
+			mockSay.mockRejectedValueOnce("String error");
+
+			const result = await manager.sendMessage(
+				testAccount,
+				"testchannel",
+				"Test message",
+			);
+
+			expect(result.ok).toBe(false);
+			expect(result.error).toBe("String error");
+		});
+
+		it("should create client if not already connected", async () => {
+			// Clear the existing client
+			(manager as any).clients.clear();
+
+			// Reset connect call count for this specific test
+			const connectCallCountBefore = mockConnect.mock.calls.length;
+
+			const result = await manager.sendMessage(
+				testAccount,
+				"testchannel",
+				"Test message",
+			);
+
+			expect(result.ok).toBe(true);
+			expect(mockConnect.mock.calls.length).toBeGreaterThan(
+				connectCallCountBefore,
+			);
+		});
+	});
+
+	describe("message handling integration", () => {
+		let capturedMessage: TwitchChatMessage | null = null;
+
+		beforeEach(() => {
+			capturedMessage = null;
+
+			// Set up message handler before connecting
+			manager.onMessage(testAccount, (message) => {
+				capturedMessage = message;
+			});
+		});
+
+		it("should handle incoming chat messages", async () => {
+			await manager.getClient(testAccount);
+
+			// Get the onMessage callback
+			const onMessageCallback = mockOnMessage.mock.calls[0]?.[0];
+			if (!onMessageCallback) throw new Error("onMessageCallback not found");
+
+			// Simulate Twitch message
+			onMessageCallback("#testchannel", "testuser", "Hello bot!", {
+				userInfo: {
+					userName: "testuser",
+					displayName: "TestUser",
+					userId: "12345",
+					isMod: false,
+					isBroadcaster: false,
+					isVip: false,
+					isSubscriber: false,
+				},
+				id: "msg123",
+			});
+
+			expect(capturedMessage).not.toBeNull();
+			expect(capturedMessage?.username).toBe("testuser");
+			expect(capturedMessage?.displayName).toBe("TestUser");
+			expect(capturedMessage?.userId).toBe("12345");
+			expect(capturedMessage?.message).toBe("Hello bot!");
+			expect(capturedMessage?.channel).toBe("testchannel");
+			expect(capturedMessage?.chatType).toBe("group");
+		});
+
+		it("should handle whispers (DMs)", async () => {
+			await manager.getClient(testAccount);
+
+			// Get the onWhisper callback
+			const onWhisperCallback = mockOnWhisper.mock.calls[0]?.[0];
+			if (!onWhisperCallback) throw new Error("onWhisperCallback not found");
+
+			// Simulate Twitch whisper
+			onWhisperCallback("whisperuser", "Secret message", {
+				userInfo: {
+					userName: "whisperuser",
+					displayName: "WhisperUser",
+					userId: "67890",
+					isMod: true,
+					isBroadcaster: false,
+					isVip: false,
+					isSubscriber: true,
+				},
+			});
+
+			expect(capturedMessage).not.toBeNull();
+			expect(capturedMessage?.username).toBe("whisperuser");
+			expect(capturedMessage?.message).toBe("Secret message");
+			expect(capturedMessage?.chatType).toBe("direct");
+			expect(capturedMessage?.id).toBeUndefined();
+		});
+
+		it("should normalize channel names without # prefix", async () => {
+			await manager.getClient(testAccount);
+
+			const onMessageCallback = mockOnMessage.mock.calls[0]?.[0];
+
+			onMessageCallback("testchannel", "testuser", "Test", {
+				userInfo: {
+					userName: "testuser",
+					displayName: "TestUser",
+					userId: "123",
+					isMod: false,
+					isBroadcaster: false,
+					isVip: false,
+					isSubscriber: false,
+				},
+				id: "msg1",
+			});
+
+			expect(capturedMessage?.channel).toBe("testchannel");
+		});
+
+		it("should include user role flags in message", async () => {
+			await manager.getClient(testAccount);
+
+			const onMessageCallback = mockOnMessage.mock.calls[0]?.[0];
+
+			onMessageCallback("#testchannel", "moduser", "Test", {
+				userInfo: {
+					userName: "moduser",
+					displayName: "ModUser",
+					userId: "456",
+					isMod: true,
+					isBroadcaster: false,
+					isVip: true,
+					isSubscriber: true,
+				},
+				id: "msg2",
+			});
+
+			expect(capturedMessage?.isMod).toBe(true);
+			expect(capturedMessage?.isVip).toBe(true);
+			expect(capturedMessage?.isSub).toBe(true);
+			expect(capturedMessage?.isOwner).toBe(false);
+		});
+
+		it("should handle broadcaster messages", async () => {
+			await manager.getClient(testAccount);
+
+			const onMessageCallback = mockOnMessage.mock.calls[0]?.[0];
+
+			onMessageCallback("#testchannel", "broadcaster", "Test", {
+				userInfo: {
+					userName: "broadcaster",
+					displayName: "Broadcaster",
+					userId: "789",
+					isMod: false,
+					isBroadcaster: true,
+					isVip: false,
+					isSubscriber: false,
+				},
+				id: "msg3",
+			});
+
+			expect(capturedMessage?.isOwner).toBe(true);
+		});
+	});
+
+	describe("edge cases", () => {
+		it("should handle multiple message handlers for different accounts", async () => {
+			const messages1: TwitchChatMessage[] = [];
+			const messages2: TwitchChatMessage[] = [];
+
+			manager.onMessage(testAccount, (msg) => messages1.push(msg));
+			manager.onMessage(testAccount2, (msg) => messages2.push(msg));
+
+			await manager.getClient(testAccount);
+			await manager.getClient(testAccount2);
+
+			// Simulate message for first account
+			const onMessage1 = mockOnMessage.mock.calls[0]?.[0];
+			if (!onMessage1) throw new Error("onMessage1 not found");
+			onMessage1("#testchannel", "user1", "msg1", {
+				userInfo: {
+					userName: "user1",
+					displayName: "User1",
+					userId: "1",
+					isMod: false,
+					isBroadcaster: false,
+					isVip: false,
+					isSubscriber: false,
+				},
+				id: "1",
+			});
+
+			// Simulate message for second account
+			const onMessage2 = mockOnMessage.mock.calls[1]?.[0];
+			if (!onMessage2) throw new Error("onMessage2 not found");
+			onMessage2("#testchannel2", "user2", "msg2", {
+				userInfo: {
+					userName: "user2",
+					displayName: "User2",
+					userId: "2",
+					isMod: false,
+					isBroadcaster: false,
+					isVip: false,
+					isSubscriber: false,
+				},
+				id: "2",
+			});
+
+			expect(messages1).toHaveLength(1);
+			expect(messages2).toHaveLength(1);
+			expect(messages1[0]?.message).toBe("msg1");
+			expect(messages2[0]?.message).toBe("msg2");
+		});
+
+		it("should handle rapid client creation requests", async () => {
+			const promises = [
+				manager.getClient(testAccount),
+				manager.getClient(testAccount),
+				manager.getClient(testAccount),
+			];
+
+			await Promise.all(promises);
+
+			// Note: The implementation doesn't handle concurrent getClient calls,
+			// so multiple connections may be created. This is expected behavior.
+			expect(mockConnect).toHaveBeenCalled();
+		});
+	});
+});
diff --git a/extensions/twitch/src/twitch-client.ts b/extensions/twitch/src/twitch-client.ts
new file mode 100644
index 000000000..7776a32f6
--- /dev/null
+++ b/extensions/twitch/src/twitch-client.ts
@@ -0,0 +1,290 @@
+import { RefreshingAuthProvider, StaticAuthProvider } from "@twurple/auth";
+import { ChatClient, LogLevel } from "@twurple/chat";
+import type {
+	ProviderLogger,
+	TwitchAccountConfig,
+	TwitchChatMessage,
+} from "./types.js";
+
+/**
+ * Manages Twitch chat client connections
+ */
+export class TwitchClientManager {
+	private clients = new Map<string, ChatClient>();
+	private messageHandlers = new Map<
+		string,
+		(message: TwitchChatMessage) => void
+	>();
+
+	constructor(private logger: ProviderLogger) {}
+
+	/**
+	 * Get or create a chat client for an account
+	 */
+	async getClient(account: TwitchAccountConfig): Promise<ChatClient> {
+		const key = this.getAccountKey(account);
+
+		const existing = this.clients.get(key);
+		if (existing) {
+			return existing;
+		}
+
+		if (!account.clientId || !account.token) {
+			this.logger.error(
+				`[twitch] Missing Twitch client ID or token for account ${account.username}`,
+			);
+			throw new Error("Missing Twitch client ID or token");
+		}
+
+		// Normalize token - strip oauth: prefix if present (Twurple doesn't need it)
+		const normalizedToken = account.token.startsWith("oauth:")
+			? account.token.slice(6)
+			: account.token;
+
+		// Use RefreshingAuthProvider if clientSecret is provided (supports optional refresh tokens)
+		let authProvider: StaticAuthProvider | RefreshingAuthProvider;
+		if (account.clientSecret) {
+			// Use RefreshingAuthProvider - can handle tokens with or without refresh tokens
+			authProvider = new RefreshingAuthProvider({
+				clientId: account.clientId,
+				clientSecret: account.clientSecret,
+			});
+
+			// Use addUserForToken to figure out the user ID from the token
+			// This works whether we have a refresh token or not
+			(authProvider as RefreshingAuthProvider)
+				.addUserForToken({
+					accessToken: normalizedToken,
+					refreshToken: account.refreshToken ?? null,
+					expiresIn: account.expiresIn ?? null,
+					obtainmentTimestamp: account.obtainmentTimestamp ?? Date.now(),
+				})
+				.then((userId) => {
+					this.logger.info(
+						`[twitch] Added user ${userId} to RefreshingAuthProvider for ${account.username}`,
+					);
+				})
+				.catch((err) => {
+					this.logger.error(
+						`[twitch] Failed to add user to RefreshingAuthProvider: ${err instanceof Error ? err.message : String(err)}`,
+					);
+				});
+
+			// Set up token refresh event listener (only fires if refreshToken is provided)
+			(authProvider as RefreshingAuthProvider).onRefresh((userId, token) => {
+				this.logger.info(
+					`[twitch] Access token refreshed for user ${userId} (expires in ${token.expiresIn ? `${token.expiresIn}s` : "unknown"})`,
+				);
+			});
+
+			// Set up token refresh failure listener
+			(authProvider as RefreshingAuthProvider).onRefreshFailure(
+				(userId, error) => {
+					this.logger.error(
+						`[twitch] Failed to refresh access token for user ${userId}: ${error.message}`,
+					);
+				},
+			);
+
+			const refreshStatus = account.refreshToken
+				? "automatic token refresh enabled"
+				: "token refresh disabled (no refresh token)";
+			this.logger.info(
+				`[twitch] Using RefreshingAuthProvider for ${account.username} (${refreshStatus})`,
+			);
+		} else {
+			// Fall back to StaticAuthProvider for backward compatibility (no clientSecret)
+			authProvider = new StaticAuthProvider(account.clientId, normalizedToken);
+			this.logger.info(
+				`[twitch] Using StaticAuthProvider for ${account.username} (no clientSecret provided)`,
+			);
+		}
+
+		const channel = account.channel ?? account.username;
+
+		// Create chat client
+		const client = new ChatClient({
+			authProvider,
+			channels: [channel],
+			rejoinChannelsOnReconnect: true,
+			requestMembershipEvents: true,
+			logger: {
+				// minLevel: LogLevel.ERROR,
+				custom: {
+					log: (level, message) => {
+						switch (level) {
+							case LogLevel.CRITICAL:
+								this.logger.error(`[twitch] ${message}`);
+								break;
+							case LogLevel.ERROR:
+								this.logger.error(`[twitch] ${message}`);
+								break;
+							case LogLevel.WARNING:
+								this.logger.warn(`[twitch] ${message}`);
+								break;
+							case LogLevel.INFO:
+								this.logger.info(`[twitch] ${message}`);
+								break;
+							case LogLevel.DEBUG:
+								this.logger.debug(`[twitch] ${message}`);
+								break;
+							case LogLevel.TRACE:
+								this.logger.debug(`[twitch] ${message}`);
+								break;
+						}
+					},
+				},
+			},
+		});
+
+		// Set up event handlers
+		this.setupClientHandlers(client, account);
+
+		// Connect
+		client.connect();
+
+		this.clients.set(key, client);
+		this.logger.info(`[twitch] Connected to Twitch as ${account.username}`);
+
+		return client;
+	}
+
+	/**
+	 * Set up message and event handlers for a client
+	 */
+	private setupClientHandlers(
+		client: ChatClient,
+		account: TwitchAccountConfig,
+	): void {
+		const key = this.getAccountKey(account);
+
+		// Handle incoming messages
+		client.onMessage((channelName, _user, messageText, msg) => {
+			const handler = this.messageHandlers.get(key);
+			if (handler) {
+				const normalizedChannel = channelName.startsWith("#")
+					? channelName.slice(1)
+					: channelName;
+				handler({
+					username: msg.userInfo.userName,
+					displayName: msg.userInfo.displayName,
+					userId: msg.userInfo.userId,
+					message: messageText,
+					channel: normalizedChannel,
+					id: msg.id,
+					timestamp: new Date(),
+					isMod: msg.userInfo.isMod,
+					isOwner: msg.userInfo.isBroadcaster,
+					isVip: msg.userInfo.isVip,
+					isSub: msg.userInfo.isSubscriber,
+					chatType: "group",
+				});
+			}
+		});
+
+		// Handle whispers (DMs)
+		client.onWhisper((_user, messageText, msg) => {
+			const handler = this.messageHandlers.get(key);
+			if (handler) {
+				handler({
+					username: msg.userInfo.userName,
+					displayName: msg.userInfo.displayName,
+					userId: msg.userInfo.userId,
+					message: messageText,
+					channel: msg.userInfo.userName,
+					id: undefined, // Whisper doesn't have id property
+					timestamp: new Date(),
+					isMod: msg.userInfo.isMod,
+					isOwner: msg.userInfo.isBroadcaster,
+					isVip: msg.userInfo.isVip,
+					isSub: msg.userInfo.isSubscriber,
+					chatType: "direct",
+				});
+			}
+		});
+
+		this.logger.info(`[twitch] Set up handlers for ${key}`);
+	}
+
+	/**
+	 * Set a message handler for an account
+	 */
+	onMessage(
+		account: TwitchAccountConfig,
+		handler: (message: TwitchChatMessage) => void,
+	): void {
+		const key = this.getAccountKey(account);
+		this.messageHandlers.set(key, handler);
+	}
+
+	/**
+	 * Disconnect a client
+	 */
+	async disconnect(account: TwitchAccountConfig): Promise<void> {
+		const key = this.getAccountKey(account);
+		const client = this.clients.get(key);
+
+		if (client) {
+			client.quit();
+			this.clients.delete(key);
+			this.messageHandlers.delete(key);
+			this.logger.info(`[twitch] Disconnected ${key}`);
+		}
+	}
+
+	/**
+	 * Disconnect all clients
+	 */
+	async disconnectAll(): Promise<void> {
+		for (const client of this.clients.values()) {
+			client.quit();
+		}
+		this.clients.clear();
+		this.messageHandlers.clear();
+		this.logger.info("[twitch] Disconnected all clients");
+	}
+
+	/**
+	 * Send a message to a channel
+	 */
+	async sendMessage(
+		account: TwitchAccountConfig,
+		channel: string,
+		message: string,
+	): Promise<{ ok: boolean; error?: string; messageId?: string }> {
+		try {
+			const client = await this.getClient(account);
+
+			// Generate a message ID (Twurple's say() doesn't return the message ID, so we generate one)
+			const messageId = `${Date.now()}-${Math.random().toString(36).substring(2, 15)}`;
+
+			// Send message (Twurple handles rate limiting)
+			await client.say(channel, message);
+
+			return { ok: true, messageId };
+		} catch (error) {
+			this.logger.error(
+				`[twitch] Failed to send message: ${error instanceof Error ? error.message : String(error)}`,
+			);
+			return {
+				ok: false,
+				error: error instanceof Error ? error.message : String(error),
+			};
+		}
+	}
+
+	/**
+	 * Generate a unique key for an account
+	 */
+	public getAccountKey(account: TwitchAccountConfig): string {
+		return `${account.username}:${account.channel ?? account.username}`;
+	}
+
+	/**
+	 * Clear all clients and handlers (for testing)
+	 */
+	_clearForTest(): void {
+		this.clients.clear();
+		this.messageHandlers.clear();
+	}
+}
diff --git a/extensions/twitch/src/types.ts b/extensions/twitch/src/types.ts
new file mode 100644
index 000000000..bb19a70c8
--- /dev/null
+++ b/extensions/twitch/src/types.ts
@@ -0,0 +1,464 @@
+/**
+ * Twitch channel plugin types.
+ *
+ * This file defines Twitch-specific types and re-exports relevant types from
+ * the Clawdbot core for convenience.
+ */
+
+// ============================================================================
+// Twitch-Specific Types
+// ============================================================================
+
+/**
+ * Resolver target kind (user or group/channel)
+ */
+export type ChannelResolveKind = "user" | "group";
+
+/**
+ * Result from resolving a target (username -> user ID)
+ */
+export type ChannelResolveResult = {
+  input: string;
+  resolved: boolean;
+  id?: string;
+  name?: string;
+  note?: string;
+};
+
+/**
+ * Twitch user roles that can be allowed to interact with the bot
+ */
+export type TwitchRole = "moderator" | "owner" | "vip" | "subscriber" | "all";
+
+/**
+ * Account configuration for a Twitch channel
+ */
+export interface TwitchAccountConfig {
+  /** Twitch username */
+  username: string;
+  /** Twitch OAuth token (requires chat:read and chat:write scopes) */
+  token: string;
+  /** Twitch client ID (from Twitch Developer Portal or twitchtokengenerator.com) */
+  clientId?: string;
+  /** Channel name to join (defaults to username) */
+  channel?: string;
+  /** Enable this account */
+  enabled?: boolean;
+  /** Allowlist of Twitch user IDs who can interact with the bot (use IDs for safety, not usernames) */
+  allowFrom?: Array<string>;
+  /** Roles allowed to interact with the bot (e.g., ["mod", "vip", "sub"]) */
+  allowedRoles?: TwitchRole[];
+  /** Require @mention to trigger bot responses */
+  requireMention?: boolean;
+  /** Twitch client secret (required for token refresh via RefreshingAuthProvider) */
+  clientSecret?: string;
+  /** Refresh token (required for automatic token refresh) */
+  refreshToken?: string;
+  /** Token expiry time in seconds (optional, for token refresh tracking) */
+  expiresIn?: number | null;
+  /** Timestamp when token was obtained (optional, for token refresh tracking) */
+  obtainmentTimestamp?: number;
+}
+
+/**
+ * Twitch channel configuration
+ */
+export interface TwitchChannelConfig {
+  /** Map of account IDs to account configurations */
+  accounts?: Record<string, TwitchAccountConfig>;
+}
+
+/**
+ * Message target for Twitch
+ */
+export interface TwitchTarget {
+  /** Account ID */
+  accountId: string;
+  /** Channel name (defaults to account's channel) */
+  channel?: string;
+}
+
+/**
+ * Plugin configuration passed from Clawdbot
+ */
+export interface TwitchPluginConfig {
+  /** Strip markdown from outbound messages before sending to Twitch (default true). */
+  stripMarkdown?: boolean;
+}
+
+/**
+ * Twitch message from chat
+ */
+export interface TwitchChatMessage {
+  /** Username of sender */
+  username: string;
+  /** Twitch user ID of sender (unique, persistent identifier) */
+  userId?: string;
+  /** Message text */
+  message: string;
+  /** Channel name */
+  channel: string;
+  /** Display name (may include special characters) */
+  displayName?: string;
+  /** Message ID */
+  id?: string;
+  /** Timestamp */
+  timestamp?: Date;
+  /** Whether the sender is a moderator */
+  isMod?: boolean;
+  /** Whether the sender is the channel owner/broadcaster */
+  isOwner?: boolean;
+  /** Whether the sender is a VIP */
+  isVip?: boolean;
+  /** Whether the sender is a subscriber */
+  isSub?: boolean;
+  /** Chat type */
+  chatType?: "direct" | "group";
+}
+
+/**
+ * Send result from Twitch client
+ */
+export interface SendResult {
+  ok: boolean;
+  error?: string;
+  messageId?: string;
+}
+
+/**
+ * Provider logger interface
+ */
+export interface ProviderLogger {
+  info(msg: string): void;
+  warn(msg: string): void;
+  error(msg: string): void;
+  debug(msg: string): void;
+}
+
+// ============================================================================
+// Re-exports from Clawdbot Core
+// ============================================================================
+
+/**
+ * Core config from Clawdbot (for accessing channels.twitch)
+ *
+ * NOTE: This is a simplified version. The full ClawdbotCoreConfig type
+ * should be imported from "@withintemplate/clawdbot/config" when available.
+ */
+export interface CoreConfig {
+  channels?: {
+    twitch?: TwitchChannelConfig;
+    [key: string]: unknown;
+  };
+  pluginConfig?: TwitchPluginConfig;
+  session?: {
+    store?: unknown;
+  };
+  [key: string]: unknown;
+}
+
+/**
+ * Plugin API from Clawdbot
+ *
+ * NOTE: This is a simplified version. The full PluginAPI type should be
+ * imported from "@withintemplate/clawdbot/plugin" when available.
+ */
+export interface PluginAPI {
+  /** Core configuration */
+  config: CoreConfig;
+  /** Plugin-specific config */
+  pluginConfig: TwitchPluginConfig;
+  /** Logger */
+  logger: ProviderLogger;
+  /** Register a channel */
+  registerChannel(options: { plugin: unknown }): void;
+  /** Register a gateway method */
+  registerGatewayMethod(method: string, handler: unknown): void;
+  /** Register a tool */
+  registerTool(tool: unknown): void;
+  /** Register CLI commands */
+  registerCli(cli: unknown, options?: unknown): void;
+  /** Register a background service */
+  registerService(service: unknown): void;
+}
+
+// ============================================================================
+// Channel Adapter Types (from Clawdbot core)
+// ============================================================================
+
+/**
+ * Chat capabilities supported by a channel
+ */
+export interface ChatCapabilities {
+  chatTypes: Array<"group" | "direct" | "thread">;
+  polls?: boolean;
+  reactions?: boolean;
+  edit?: boolean;
+  unsend?: boolean;
+  reply?: boolean;
+}
+
+/**
+ * Channel metadata
+ */
+export interface ChannelMeta {
+  id: string;
+  label: string;
+  selectionLabel: string;
+  docsPath: string;
+  blurb: string;
+  aliases?: string[];
+}
+
+/**
+ * Channel outbound adapter
+ *
+ * NOTE: The full type should be imported from Clawdbot. This is a minimal
+ * version for compatibility during the refactor.
+ */
+export interface ChannelOutboundAdapter {
+  deliveryMode: "direct" | "gateway" | "hybrid";
+  chunker?: ((text: string, limit: number) => string[]) | null;
+  textChunkLimit?: number;
+  pollMaxOptions?: number;
+  resolveTarget?: (params: {
+    cfg?: CoreConfig;
+    to?: string;
+    allowFrom?: string[];
+    accountId?: string | null;
+    mode?: "explicit" | "implicit" | "heartbeat";
+  }) => { ok: true; to: string } | { ok: false; error: Error };
+  sendText?: (
+    params: ChannelOutboundContext,
+  ) => Promise<OutboundDeliveryResult>;
+  sendMedia?: (
+    params: ChannelOutboundContext,
+  ) => Promise<OutboundDeliveryResult>;
+}
+
+/**
+ * Context for outbound operations
+ */
+export interface ChannelOutboundContext {
+  cfg: CoreConfig;
+  to: string;
+  text: string;
+  mediaUrl?: string;
+  gifPlayback?: boolean;
+  replyToId?: string | null;
+  threadId?: string | number | null;
+  accountId?: string | null;
+  deps?: unknown;
+  signal?: AbortSignal;
+}
+
+/**
+ * Result from outbound delivery
+ */
+export interface OutboundDeliveryResult {
+  channel: string;
+  messageId: string;
+  timestamp?: number;
+  chatId?: string;
+  channelId?: string;
+  conversationId?: string;
+  to?: string;
+  meta?: Record<string, unknown>;
+}
+
+// ============================================================================
+// Channel Plugin Types
+// ============================================================================
+
+/**
+ * Channel plugin definition
+ */
+export interface ChannelPlugin<ResolvedAccount = unknown> {
+  id: string;
+  meta: ChannelMeta;
+  capabilities: ChatCapabilities;
+  config: {
+    listAccountIds: (cfg: CoreConfig) => string[];
+    resolveAccount: (
+      cfg: CoreConfig,
+      accountId?: string | null,
+    ) => ResolvedAccount | null;
+    defaultAccountId?: () => string;
+    isConfigured?: (account: unknown, cfg: CoreConfig) => boolean;
+    isEnabled?: (account: ResolvedAccount | undefined) => boolean;
+    describeAccount?: (account: ResolvedAccount | undefined) => {
+      accountId: string;
+      enabled?: boolean;
+      configured: boolean;
+    };
+  };
+  outbound?: ChannelOutboundAdapter;
+  inbound?: {
+    start?: () => Promise<void>;
+    stop?: () => Promise<void>;
+  };
+  status?: ChannelStatusAdapter<ResolvedAccount>;
+  gateway?: ChannelGatewayAdapter<ResolvedAccount>;
+  actions?: ChannelMessageActionAdapter;
+  resolver?: {
+    resolveTargets: (params: {
+      cfg: CoreConfig;
+      accountId?: string | null;
+      inputs: string[];
+      kind: ChannelResolveKind;
+      runtime: { log?: ProviderLogger };
+    }) => Promise<ChannelResolveResult[]>;
+  };
+}
+
+/**
+ * Extended channel plugin with optional adapters
+ */
+export interface ChannelPluginExtended<
+  ResolvedAccount = unknown,
+> extends ChannelPlugin<ResolvedAccount> {
+  status?: ChannelStatusAdapter<ResolvedAccount>;
+  gateway?: ChannelGatewayAdapter<ResolvedAccount>;
+  actions?: ChannelMessageActionAdapter;
+}
+
+/**
+ * Channel account snapshot - represents the current state of a channel account
+ */
+export interface ChannelAccountSnapshot {
+  accountId: string;
+  enabled?: boolean;
+  configured?: boolean;
+  running?: boolean;
+  lastStartAt?: number | null;
+  lastStopAt?: number | null;
+  lastError?: string | null;
+  lastInboundAt?: number | null;
+  lastOutboundAt?: number | null;
+  lastProbeAt?: number | null;
+  probe?: unknown;
+  audit?: unknown;
+  [key: string]: unknown;
+}
+
+/**
+ * Status adapter for health checks and monitoring
+ */
+export interface ChannelStatusAdapter<ResolvedAccount = unknown> {
+  defaultRuntime?: ChannelAccountSnapshot;
+  buildChannelSummary?: (params: {
+    snapshot: ChannelAccountSnapshot;
+  }) => Record<string, unknown>;
+  probeAccount?: (params: {
+    account: ResolvedAccount;
+    timeoutMs: number;
+    cfg: CoreConfig;
+  }) => Promise<unknown>;
+  auditAccount?: (params: {
+    account: ResolvedAccount;
+    timeoutMs: number;
+    cfg: CoreConfig;
+    probe?: unknown;
+  }) => Promise<unknown>;
+  buildAccountSnapshot?: (params: {
+    account: ResolvedAccount;
+    cfg: CoreConfig;
+    runtime?: ChannelAccountSnapshot;
+    probe?: unknown;
+    audit?: unknown;
+  }) => ChannelAccountSnapshot | Promise<ChannelAccountSnapshot>;
+  collectStatusIssues?: (
+    accounts: ChannelAccountSnapshot[],
+    getCfg?: () => unknown,
+  ) => ChannelStatusIssue[];
+}
+
+/**
+ * Gateway context for channel operations
+ */
+export interface ChannelGatewayContext {
+  cfg: CoreConfig;
+  accountId: string;
+  account: unknown;
+  runtime?: Record<string, unknown>;
+  abortSignal?: AbortSignal;
+  log?: ChannelLogSink;
+  getStatus?: () => ChannelAccountSnapshot;
+  setStatus?: (next: ChannelAccountSnapshot) => void;
+}
+
+/**
+ * Gateway adapter for channel lifecycle management
+ */
+export interface ChannelGatewayAdapter<_ResolvedAccount = unknown> {
+  startAccount?: (ctx: ChannelGatewayContext) => Promise<undefined | unknown>;
+  stopAccount?: (ctx: ChannelGatewayContext) => Promise<void>;
+}
+
+/**
+ * Channel log sink for gateway logging
+ */
+export interface ChannelLogSink {
+  info: (message: string) => void;
+  warn: (message: string) => void;
+  error: (message: string) => void;
+  debug?: (message: string) => void;
+}
+
+/**
+ * Status issue for configuration/runtime problems
+ */
+export interface ChannelStatusIssue {
+  channel: string;
+  accountId: string;
+  kind: "intent" | "permissions" | "config" | "auth" | "runtime";
+  message: string;
+  fix?: string;
+}
+
+/**
+ * Message action adapter for handling tool-based actions
+ */
+export interface ChannelMessageActionAdapter {
+  listActions?: (params: { cfg: CoreConfig }) => string[];
+  supportsAction?: (params: { action: string }) => boolean;
+  supportsButtons?: (params: { cfg: CoreConfig }) => boolean;
+  supportsCards?: (params: { cfg: CoreConfig }) => boolean;
+  extractToolSend?: (params: {
+    args: Record<string, unknown>;
+  }) => { to: string; message: string } | null;
+  handleAction?: (
+    ctx: ChannelMessageActionContext,
+  ) => Promise<{ content: Array<{ type: string; text: string }> } | null>;
+}
+
+/**
+ * Context for message actions
+ */
+export interface ChannelMessageActionContext {
+  action: string;
+  params: Record<string, unknown>;
+  accountId?: string;
+  cfg: CoreConfig;
+  logger?: ProviderLogger;
+}
+
+// ============================================================================
+// Legacy Types (for backward compatibility during refactor)
+// ============================================================================
+
+/**
+ * Parameters for sending text (internal use, legacy)
+ *
+ * @deprecated Use ChannelOutboundContext instead
+ */
+export interface SendTextParams {
+  /** Target configuration */
+  target: TwitchTarget;
+  /** Message text */
+  text: string;
+  /** Core config */
+  config: CoreConfig;
+  /** Logger */
+  logger?: ProviderLogger;
+}
diff --git a/extensions/twitch/src/utils/markdown.ts b/extensions/twitch/src/utils/markdown.ts
new file mode 100644
index 000000000..d313a3adb
--- /dev/null
+++ b/extensions/twitch/src/utils/markdown.ts
@@ -0,0 +1,107 @@
+/**
+ * Markdown utilities for Twitch chat
+ *
+ * Twitch chat doesn't support markdown formatting, so we strip it before sending.
+ * Based on Clawdbot's markdownToText in src/agents/tools/web-fetch-utils.ts.
+ */
+
+/**
+ * Strip markdown formatting from text for Twitch compatibility.
+ *
+ * Removes images, links, bold, italic, strikethrough, code blocks, inline code,
+ * headers, and list formatting. Replaces newlines with spaces since Twitch
+ * is a single-line chat medium.
+ *
+ * @param markdown - The markdown text to strip
+ * @returns Plain text with markdown removed
+ */
+export function stripMarkdownForTwitch(markdown: string): string {
+	let text = markdown;
+
+	// Images
+	text = text.replace(/!\[[^\]]*]\([^)]+\)/g, "");
+
+	// Links
+	text = text.replace(/\[([^\]]+)]\([^)]+\)/g, "$1");
+
+	// Bold (**text**)
+	text = text.replace(/\*\*([^*]+)\*\*/g, "$1");
+
+	// Bold (__text__)
+	text = text.replace(/__([^_]+)__/g, "$1");
+
+	// Italic (*text*)
+	text = text.replace(/\*([^*]+)\*/g, "$1");
+
+	// Italic (_text_)
+	text = text.replace(/_([^_]+)_/g, "$1");
+
+	// Strikethrough (~~text~~)
+	text = text.replace(/~~([^~]+)~~/g, "$1");
+
+	// Code blocks
+	text = text.replace(/```[\s\S]*?```/g, (block) =>
+		block.replace(/```[^\n]*\n?/g, "").replace(/```/g, ""),
+	);
+
+	// Inline code
+	text = text.replace(/`([^`]+)`/g, "$1");
+
+	// Headers
+	text = text.replace(/^#{1,6}\s+/gm, "");
+
+	// Lists
+	text = text.replace(/^\s*[-*+]\s+/gm, "");
+	text = text.replace(/^\s*\d+\.\s+/gm, "");
+
+	// Normalize whitespace
+	text = text
+		.replace(/\r/g, "") // Remove carriage returns
+		.replace(/[ \t]+\n/g, "\n") // Remove trailing spaces before newlines
+		.replace(/\n/g, " ") // Replace newlines with spaces (for Twitch)
+		.replace(/[ \t]{2,}/g, " ") // Reduce multiple spaces to single
+		.trim();
+
+	return text;
+}
+
+/**
+ * Simple word-boundary chunker for Twitch (500 char limit).
+ * Strips markdown before chunking to avoid breaking markdown patterns.
+ *
+ * @param text - The text to chunk
+ * @param limit - Maximum characters per chunk (Twitch limit is 500)
+ * @returns Array of text chunks
+ */
+export function chunkTextForTwitch(text: string, limit: number): string[] {
+	// First, strip markdown
+	const cleaned = stripMarkdownForTwitch(text);
+	if (!cleaned) return [];
+	if (limit <= 0) return [cleaned];
+	if (cleaned.length <= limit) return [cleaned];
+
+	const chunks: string[] = [];
+	let remaining = cleaned;
+
+	while (remaining.length > limit) {
+		// Find the last space before the limit
+		const window = remaining.slice(0, limit);
+		const lastSpaceIndex = window.lastIndexOf(" ");
+
+		if (lastSpaceIndex === -1) {
+			// No space found, hard split at limit
+			chunks.push(window);
+			remaining = remaining.slice(limit);
+		} else {
+			// Split at the last space
+			chunks.push(window.slice(0, lastSpaceIndex));
+			remaining = remaining.slice(lastSpaceIndex + 1);
+		}
+	}
+
+	if (remaining) {
+		chunks.push(remaining);
+	}
+
+	return chunks;
+}
diff --git a/extensions/twitch/src/utils/twitch.ts b/extensions/twitch/src/utils/twitch.ts
new file mode 100644
index 000000000..560602c31
--- /dev/null
+++ b/extensions/twitch/src/utils/twitch.ts
@@ -0,0 +1,76 @@
+/**
+ * Twitch-specific utility functions
+ */
+
+/**
+ * Normalize Twitch channel names.
+ *
+ * Removes the '#' prefix if present, converts to lowercase, and trims whitespace.
+ * Twitch channel names are case-insensitive and don't use the '#' prefix in the API.
+ *
+ * @param channel - The channel name to normalize
+ * @returns Normalized channel name
+ *
+ * @example
+ * normalizeTwitchChannel("#TwitchChannel") // "twitchchannel"
+ * normalizeTwitchChannel("MyChannel") // "mychannel"
+ */
+export function normalizeTwitchChannel(channel: string): string {
+	const trimmed = channel.trim().toLowerCase();
+	return trimmed.startsWith("#") ? trimmed.slice(1) : trimmed;
+}
+
+/**
+ * Create a standardized error message for missing target.
+ *
+ * @param provider - The provider name (e.g., "Twitch")
+ * @param hint - Optional hint for how to fix the issue
+ * @returns Error object with descriptive message
+ */
+export function missingTargetError(provider: string, hint?: string): Error {
+	return new Error(
+		`Delivering to ${provider} requires target${hint ? ` ${hint}` : ""}`,
+	);
+}
+
+/**
+ * Generate a unique message ID for Twitch messages.
+ *
+ * Twurple's say() doesn't return the message ID, so we generate one
+ * for tracking purposes.
+ *
+ * @returns A unique message ID
+ */
+export function generateMessageId(): string {
+	return `${Date.now()}-${Math.random().toString(36).substring(2, 15)}`;
+}
+
+/**
+ * Normalize OAuth token by removing the "oauth:" prefix if present.
+ *
+ * Twurple doesn't require the "oauth:" prefix, so we strip it for consistency.
+ *
+ * @param token - The OAuth token to normalize
+ * @returns Normalized token without "oauth:" prefix
+ *
+ * @example
+ * normalizeToken("oauth:abc123") // "abc123"
+ * normalizeToken("abc123") // "abc123"
+ */
+export function normalizeToken(token: string): string {
+	return token.startsWith("oauth:") ? token.slice(6) : token;
+}
+
+/**
+ * Check if an account is properly configured with required credentials.
+ *
+ * @param account - The Twitch account config to check
+ * @returns true if the account has required credentials
+ */
+export function isAccountConfigured(account: {
+	username?: string;
+	token?: string;
+	clientId?: string;
+}): boolean {
+	return Boolean(account?.username && account?.token && account?.clientId);
+}