diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5909c9899..224b6b886 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Docs: https://docs.molt.bot
 Status: beta.
 
 ### Changes
+- Agents: add GitHub Copilot SDK integration for `copilot-cli` backend. Supports programmatic control of the Copilot CLI via `@github/copilot-sdk`.
 - Rebrand: rename the npm package/CLI to `moltbot`, add a `moltbot` compatibility shim, and move extensions to the `@moltbot/*` scope.
 - Commands: group /help and /commands output with Telegram paging. (#2504) Thanks @hougangdev.
 - macOS: limit project-local `node_modules/.bin` PATH preference to debug builds (reduce PATH hijacking risk).
diff --git a/docs/gateway/cli-backends.md b/docs/gateway/cli-backends.md
index b80683a16..67bcc8ddd 100644
--- a/docs/gateway/cli-backends.md
+++ b/docs/gateway/cli-backends.md
@@ -200,6 +200,25 @@ Moltbot also ships a default for `codex-cli`:
 - `imageArg: "--image"`
 - `sessionMode: "existing"`
 
+Moltbot also ships a default for `copilot-cli`:
+
+- `command: "copilot"`
+- `sessionMode: "always"`
+- Uses the `@github/copilot-sdk` for programmatic control via JSON-RPC
+- Supports models: `gpt-5`, `gpt-4.1`, `gpt-4.1-mini`, `gpt-4o`, `o1`, `o1-mini`, `o3-mini`, `claude-sonnet-4.5`
+
+To use Copilot CLI:
+```bash
+# Install the CLI globally
+npm install -g @github/copilot
+
+# Authenticate
+copilot auth login
+
+# Use in Moltbot
+moltbot agent --message "hi" --model copilot-cli/gpt-4.1
+```
+
 Override only if needed (common: absolute `command` path).
 
 ## Limitations
diff --git a/docs/providers/github-copilot.md b/docs/providers/github-copilot.md
index c7b68d1bd..0757904fc 100644
--- a/docs/providers/github-copilot.md
+++ b/docs/providers/github-copilot.md
@@ -3,6 +3,7 @@ summary: "Sign in to GitHub Copilot from Moltbot using the device flow"
 read_when:
   - You want to use GitHub Copilot as a model provider
   - You need the `moltbot models auth login-github-copilot` flow
+  - You want to use the Copilot CLI as a backend
 ---
 # Github Copilot
 
@@ -10,9 +11,9 @@ read_when:
 
 GitHub Copilot is GitHub's AI coding assistant. It provides access to Copilot
 models for your GitHub account and plan. Moltbot can use Copilot as a model
-provider in two different ways.
+provider in three different ways.
 
-## Two ways to use Copilot in Moltbot
+## Three ways to use Copilot in Moltbot
 
 ### 1) Built-in GitHub Copilot provider (`github-copilot`)
 
@@ -20,7 +21,17 @@ Use the native device-login flow to obtain a GitHub token, then exchange it for
 Copilot API tokens when Moltbot runs. This is the **default** and simplest path
 because it does not require VS Code.
 
-### 2) Copilot Proxy plugin (`copilot-proxy`)
+### 2) Copilot CLI backend (`copilot-cli`)
+
+Use the official [GitHub Copilot CLI](https://docs.github.com/en/copilot/using-github-copilot/using-github-copilot-in-the-command-line)
+as a CLI backend via the `@github/copilot-sdk`. This provides access to Copilot's
+coding agent capabilities with tool execution and session persistence.
+
+Prerequisites:
+- Install the Copilot CLI: `npm install -g @github/copilot`
+- Authenticate: `copilot auth login`
+
+### 3) Copilot Proxy plugin (`copilot-proxy`)
 
 Use the **Copilot Proxy** VS Code extension as a local bridge. Moltbot talks to
 the proxy’s `/v1` endpoint and uses the model list you configure there. Choose
@@ -68,3 +79,43 @@ moltbot models set github-copilot/gpt-4o
   another ID (for example `github-copilot/gpt-4.1`).
 - The login stores a GitHub token in the auth profile store and exchanges it for a
   Copilot API token when Moltbot runs.
+
+## Copilot CLI backend configuration
+
+To use the Copilot CLI as a backend (instead of the API), configure it in your
+`moltbot.config.json`:
+
+```json5
+{
+  agents: {
+    defaults: {
+      model: { primary: "copilot-cli/gpt-4.1" },
+      cliBackends: {
+        "copilot-cli": {
+          command: "copilot",
+          // Optional: customize the CLI path
+          // command: "/usr/local/bin/copilot"
+        }
+      }
+    }
+  }
+}
+```
+
+### Available models via Copilot CLI
+
+The Copilot CLI supports the following models (availability depends on your plan):
+
+- `gpt-5`
+- `gpt-4.1`
+- `gpt-4.1-mini`
+- `gpt-4.1-nano`
+- `gpt-4o`
+- `o1`
+- `o1-mini`
+- `o3-mini`
+- `claude-sonnet-4.5`
+- `claude-sonnet-4`
+
+The Copilot CLI backend uses the `@github/copilot-sdk` for programmatic control
+of the CLI via JSON-RPC.
diff --git a/package.json b/package.json
index 04322f3af..0ae3d6d89 100644
--- a/package.json
+++ b/package.json
@@ -158,6 +158,7 @@
     "@aws-sdk/client-bedrock": "^3.975.0",
     "@buape/carbon": "0.14.0",
     "@clack/prompts": "^0.11.0",
+    "@github/copilot-sdk": "^0.1.19",
     "@grammyjs/runner": "^2.0.3",
     "@grammyjs/transformer-throttler": "^1.2.1",
     "@homebridge/ciao": "^1.3.4",
diff --git a/src/agents/auth-profiles/constants.ts b/src/agents/auth-profiles/constants.ts
index 65c2f7a54..888c6e3b1 100644
--- a/src/agents/auth-profiles/constants.ts
+++ b/src/agents/auth-profiles/constants.ts
@@ -7,6 +7,7 @@ export const LEGACY_AUTH_FILENAME = "auth.json";
 export const CLAUDE_CLI_PROFILE_ID = "anthropic:claude-cli";
 export const CODEX_CLI_PROFILE_ID = "openai-codex:codex-cli";
 export const QWEN_CLI_PROFILE_ID = "qwen-portal:qwen-cli";
+export const COPILOT_CLI_PROFILE_ID = "github-copilot:copilot-cli";
 
 export const AUTH_STORE_LOCK_OPTIONS = {
   retries: {
diff --git a/src/agents/cli-backends.ts b/src/agents/cli-backends.ts
index 55344dedc..b076ca73a 100644
--- a/src/agents/cli-backends.ts
+++ b/src/agents/cli-backends.ts
@@ -74,6 +74,37 @@ const DEFAULT_CODEX_BACKEND: CliBackendConfig = {
   serialize: true,
 };
 
+const COPILOT_MODEL_ALIASES: Record<string, string> = {
+  "gpt-5": "gpt-5",
+  "gpt-4.1": "gpt-4.1",
+  "gpt-4.1-mini": "gpt-4.1-mini",
+  "gpt-4.1-nano": "gpt-4.1-nano",
+  "gpt-4o": "gpt-4o",
+  "o1": "o1",
+  "o1-mini": "o1-mini",
+  "o3-mini": "o3-mini",
+  "claude-sonnet-4.5": "claude-sonnet-4.5",
+  "claude-sonnet-4": "claude-sonnet-4",
+};
+
+/**
+ * Default configuration for the Copilot CLI backend.
+ *
+ * Note: The Copilot CLI uses the `@github/copilot-sdk` for programmatic control.
+ * This backend config is used for CLI-style invocation patterns, but the actual
+ * execution is handled by the SDK in `copilot-runner.ts`.
+ */
+const DEFAULT_COPILOT_BACKEND: CliBackendConfig = {
+  command: "copilot",
+  args: [],
+  output: "text",
+  input: "arg",
+  modelAliases: COPILOT_MODEL_ALIASES,
+  sessionMode: "always",
+  sessionIdFields: ["sessionId", "session_id"],
+  serialize: true,
+};
+
 function normalizeBackendKey(key: string): string {
   return normalizeProviderId(key);
 }
@@ -107,6 +138,7 @@ export function resolveCliBackendIds(cfg?: MoltbotConfig): Set<string> {
   const ids = new Set<string>([
     normalizeBackendKey("claude-cli"),
     normalizeBackendKey("codex-cli"),
+    normalizeBackendKey("copilot-cli"),
   ]);
   const configured = cfg?.agents?.defaults?.cliBackends ?? {};
   for (const key of Object.keys(configured)) {
@@ -135,6 +167,12 @@ export function resolveCliBackendConfig(
     if (!command) return null;
     return { id: normalized, config: { ...merged, command } };
   }
+  if (normalized === "copilot-cli") {
+    const merged = mergeBackendConfig(DEFAULT_COPILOT_BACKEND, override);
+    const command = merged.command?.trim();
+    if (!command) return null;
+    return { id: normalized, config: { ...merged, command } };
+  }
 
   if (!override) return null;
   const command = override.command?.trim();
diff --git a/src/agents/cli-runner.ts b/src/agents/cli-runner.ts
index c998a9e6f..19cdd4317 100644
--- a/src/agents/cli-runner.ts
+++ b/src/agents/cli-runner.ts
@@ -26,9 +26,11 @@ import {
   resolveSystemPromptUsage,
   writeCliImages,
 } from "./cli-runner/helpers.js";
+import { runCopilotCliAgent, isCopilotCliAvailable } from "./copilot-runner.js";
 import { FailoverError, resolveFailoverStatus } from "./failover-error.js";
 import { classifyFailoverReason, isFailoverErrorMessage } from "./pi-embedded-helpers.js";
 import type { EmbeddedPiRunResult } from "./pi-embedded-runner.js";
+import { normalizeProviderId } from "./model-selection.js";
 
 const log = createSubsystemLogger("agent/claude-cli");
 
@@ -50,6 +52,29 @@ export async function runCliAgent(params: {
   cliSessionId?: string;
   images?: ImageContent[];
 }): Promise<EmbeddedPiRunResult> {
+  // Route copilot-cli requests to the SDK-based runner
+  const normalizedProvider = normalizeProviderId(params.provider);
+  if (normalizedProvider === "copilot-cli") {
+    return runCopilotCliAgent({
+      sessionId: params.sessionId,
+      sessionKey: params.sessionKey,
+      sessionFile: params.sessionFile,
+      workspaceDir: params.workspaceDir,
+      config: params.config,
+      prompt: params.prompt,
+      provider: params.provider,
+      model: params.model,
+      thinkLevel: params.thinkLevel,
+      timeoutMs: params.timeoutMs,
+      runId: params.runId,
+      extraSystemPrompt: params.extraSystemPrompt,
+      streamParams: params.streamParams,
+      ownerNumbers: params.ownerNumbers,
+      cliSessionId: params.cliSessionId,
+      images: params.images,
+    });
+  }
+
   const started = Date.now();
   const resolvedWorkspace = resolveUserPath(params.workspaceDir);
   const workspaceDir = resolvedWorkspace;
@@ -333,3 +358,6 @@ export async function runClaudeCliAgent(params: {
     images: params.images,
   });
 }
+
+// Re-export Copilot-specific utilities
+export { isCopilotCliAvailable } from "./copilot-runner.js";
diff --git a/src/agents/copilot-credentials.test.ts b/src/agents/copilot-credentials.test.ts
new file mode 100644
index 000000000..1cfabf75a
--- /dev/null
+++ b/src/agents/copilot-credentials.test.ts
@@ -0,0 +1,143 @@
+import { describe, expect, it, vi, beforeEach } from "vitest";
+
+import {
+  isCopilotCliInstalled,
+  readCopilotAuthStatus,
+  readCopilotAuthStatusCached,
+  resetCopilotCredentialCacheForTest,
+} from "./copilot-credentials.js";
+
+describe("copilot-credentials", () => {
+  beforeEach(() => {
+    resetCopilotCredentialCacheForTest();
+  });
+
+  describe("isCopilotCliInstalled", () => {
+    it("returns true when copilot --version succeeds", () => {
+      const execSync = vi.fn().mockReturnValue("0.0.1");
+      const result = isCopilotCliInstalled({ execSync });
+      expect(result).toBe(true);
+      expect(execSync).toHaveBeenCalledWith("copilot --version", expect.any(Object));
+    });
+
+    it("returns false when copilot --version fails", () => {
+      const execSync = vi.fn().mockImplementation(() => {
+        throw new Error("ENOENT: not found");
+      });
+      const result = isCopilotCliInstalled({ execSync });
+      expect(result).toBe(false);
+    });
+
+    it("uses custom cliPath when provided", () => {
+      const execSync = vi.fn().mockReturnValue("0.0.1");
+      isCopilotCliInstalled({ cliPath: "/usr/local/bin/copilot", execSync });
+      expect(execSync).toHaveBeenCalledWith(
+        "/usr/local/bin/copilot --version",
+        expect.any(Object),
+      );
+    });
+  });
+
+  describe("readCopilotAuthStatus", () => {
+    it("returns authenticated status when CLI reports authenticated", () => {
+      const execSync = vi.fn().mockReturnValue(
+        JSON.stringify({
+          isAuthenticated: true,
+          user: {
+            login: "testuser",
+            avatarUrl: "https://example.com/avatar.png",
+          },
+        }),
+      );
+      const result = readCopilotAuthStatus({ execSync });
+      expect(result).toEqual({
+        authenticated: true,
+        login: "testuser",
+        avatarUrl: "https://example.com/avatar.png",
+      });
+    });
+
+    it("returns not authenticated when CLI reports not authenticated", () => {
+      const execSync = vi.fn().mockReturnValue(
+        JSON.stringify({
+          isAuthenticated: false,
+        }),
+      );
+      const result = readCopilotAuthStatus({ execSync });
+      expect(result).toEqual({ authenticated: false });
+    });
+
+    it("returns null when CLI is not installed", () => {
+      const execSync = vi.fn().mockImplementation(() => {
+        const error = new Error("ENOENT: not found");
+        throw error;
+      });
+      const result = readCopilotAuthStatus({ execSync });
+      expect(result).toBe(null);
+    });
+
+    it("returns not authenticated on stderr indicating not logged in", () => {
+      const execSync = vi.fn().mockImplementation(() => {
+        const error = new Error("Command failed") as Error & { stderr: string };
+        error.stderr = "You are not logged in";
+        throw error;
+      });
+      const result = readCopilotAuthStatus({ execSync });
+      expect(result).toEqual({ authenticated: false });
+    });
+  });
+
+  describe("readCopilotAuthStatusCached", () => {
+    it("returns cached value within TTL", () => {
+      const execSync = vi.fn().mockReturnValue(
+        JSON.stringify({
+          isAuthenticated: true,
+          user: { login: "testuser" },
+        }),
+      );
+
+      // First call populates cache
+      const result1 = readCopilotAuthStatusCached({ execSync, ttlMs: 60000 });
+      expect(result1?.authenticated).toBe(true);
+      expect(execSync).toHaveBeenCalledTimes(1);
+
+      // Second call should use cache
+      const result2 = readCopilotAuthStatusCached({ execSync, ttlMs: 60000 });
+      expect(result2?.authenticated).toBe(true);
+      expect(execSync).toHaveBeenCalledTimes(1); // Not called again
+    });
+
+    it("refreshes cache after TTL expires", async () => {
+      const execSync = vi.fn().mockReturnValue(
+        JSON.stringify({
+          isAuthenticated: true,
+          user: { login: "testuser" },
+        }),
+      );
+
+      // First call with very short TTL
+      readCopilotAuthStatusCached({ execSync, ttlMs: 1 });
+      expect(execSync).toHaveBeenCalledTimes(1);
+
+      // Wait for TTL to expire
+      await new Promise((r) => setTimeout(r, 5));
+
+      // Second call should refresh
+      readCopilotAuthStatusCached({ execSync, ttlMs: 1 });
+      expect(execSync).toHaveBeenCalledTimes(2);
+    });
+
+    it("does not cache when ttlMs is 0", () => {
+      const execSync = vi.fn().mockReturnValue(
+        JSON.stringify({
+          isAuthenticated: true,
+          user: { login: "testuser" },
+        }),
+      );
+
+      readCopilotAuthStatusCached({ execSync, ttlMs: 0 });
+      readCopilotAuthStatusCached({ execSync, ttlMs: 0 });
+      expect(execSync).toHaveBeenCalledTimes(2);
+    });
+  });
+});
diff --git a/src/agents/copilot-credentials.ts b/src/agents/copilot-credentials.ts
new file mode 100644
index 000000000..b91562c1c
--- /dev/null
+++ b/src/agents/copilot-credentials.ts
@@ -0,0 +1,168 @@
+/**
+ * Credential management for the GitHub Copilot CLI.
+ *
+ * This module provides functions to check the authentication status of the Copilot CLI
+ * and cache the results for efficient repeated access.
+ */
+import { execSync } from "node:child_process";
+
+import { createSubsystemLogger } from "../logging/subsystem.js";
+
+const log = createSubsystemLogger("agents/copilot-credentials");
+
+/**
+ * Cached authentication status from the Copilot CLI.
+ */
+export type CopilotCredential = {
+  /** Whether the CLI is authenticated with a valid GitHub account. */
+  authenticated: boolean;
+  /** GitHub login username (if authenticated). */
+  login?: string;
+  /** GitHub avatar URL (if authenticated). */
+  avatarUrl?: string;
+};
+
+type CachedValue<T> = {
+  value: T | null;
+  readAt: number;
+  cacheKey: string;
+};
+
+let copilotCliCache: CachedValue<CopilotCredential> | null = null;
+
+/** Reset the cache for testing purposes. */
+export function resetCopilotCredentialCacheForTest(): void {
+  copilotCliCache = null;
+}
+
+type ExecSyncFn = typeof execSync;
+
+/**
+ * Check if the Copilot CLI is installed and available on PATH.
+ */
+export function isCopilotCliInstalled(options?: {
+  cliPath?: string;
+  execSync?: ExecSyncFn;
+}): boolean {
+  const execSyncImpl = options?.execSync ?? execSync;
+  const cliPath = options?.cliPath ?? "copilot";
+
+  try {
+    execSyncImpl(`${cliPath} --version`, {
+      encoding: "utf8",
+      timeout: 5000,
+      stdio: ["pipe", "pipe", "pipe"],
+    });
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Read the authentication status from the Copilot CLI.
+ *
+ * Requires the `copilot` CLI to be installed. If the CLI is not installed
+ * or authentication status cannot be determined, returns null.
+ */
+export function readCopilotAuthStatus(options?: {
+  cliPath?: string;
+  execSync?: ExecSyncFn;
+}): CopilotCredential | null {
+  const execSyncImpl = options?.execSync ?? execSync;
+  const cliPath = options?.cliPath ?? "copilot";
+
+  try {
+    // The Copilot CLI has a `copilot auth status --json` command that returns auth info.
+    const result = execSyncImpl(`${cliPath} auth status --json`, {
+      encoding: "utf8",
+      timeout: 10000,
+      stdio: ["pipe", "pipe", "pipe"],
+    });
+
+    const data = JSON.parse(result.trim()) as Record<string, unknown>;
+
+    // The CLI returns { isAuthenticated: boolean, user?: { login, avatarUrl } }
+    const isAuthenticated = data.isAuthenticated === true;
+    const user = data.user as Record<string, unknown> | undefined;
+
+    if (!isAuthenticated) {
+      log.info("copilot cli is not authenticated");
+      return { authenticated: false };
+    }
+
+    const login = typeof user?.login === "string" ? user.login : undefined;
+    const avatarUrl = typeof user?.avatarUrl === "string" ? user.avatarUrl : undefined;
+
+    log.info("read copilot auth status from cli", {
+      authenticated: true,
+      login,
+    });
+
+    return {
+      authenticated: true,
+      login,
+      avatarUrl,
+    };
+  } catch (error) {
+    // Check if it's a "not installed" error vs an auth error
+    const message = error instanceof Error ? error.message : String(error);
+    if (message.includes("ENOENT") || message.includes("not found")) {
+      log.debug("copilot cli not found");
+      return null;
+    }
+
+    // Parse error response - CLI may return JSON even on error
+    try {
+      const stderr =
+        error instanceof Error && "stderr" in error
+          ? String((error as { stderr: unknown }).stderr)
+          : "";
+      if (stderr.includes("not logged in") || stderr.includes("not authenticated")) {
+        return { authenticated: false };
+      }
+    } catch {
+      // Ignore parse errors
+    }
+
+    log.warn("failed to read copilot auth status", {
+      error: error instanceof Error ? error.message : String(error),
+    });
+    return null;
+  }
+}
+
+/**
+ * Read the Copilot CLI authentication status with caching.
+ *
+ * @param options.ttlMs - How long to cache the result in milliseconds (default: no caching)
+ */
+export function readCopilotAuthStatusCached(options?: {
+  cliPath?: string;
+  ttlMs?: number;
+  execSync?: ExecSyncFn;
+}): CopilotCredential | null {
+  const ttlMs = options?.ttlMs ?? 0;
+  const now = Date.now();
+  const cacheKey = options?.cliPath ?? "copilot";
+
+  if (
+    ttlMs > 0 &&
+    copilotCliCache &&
+    copilotCliCache.cacheKey === cacheKey &&
+    now - copilotCliCache.readAt < ttlMs
+  ) {
+    return copilotCliCache.value;
+  }
+
+  const value = readCopilotAuthStatus({
+    cliPath: options?.cliPath,
+    execSync: options?.execSync,
+  });
+
+  if (ttlMs > 0) {
+    copilotCliCache = { value, readAt: now, cacheKey };
+  }
+
+  return value;
+}
diff --git a/src/agents/copilot-runner.ts b/src/agents/copilot-runner.ts
new file mode 100644
index 000000000..81bf4d074
--- /dev/null
+++ b/src/agents/copilot-runner.ts
@@ -0,0 +1,160 @@
+/**
+ * Copilot CLI Runner - runs agent prompts through the GitHub Copilot SDK.
+ *
+ * This module provides a runner that uses the `@github/copilot-sdk` to execute
+ * agent prompts through the Copilot CLI, similar to how `cli-runner.ts` handles
+ * Claude CLI and Codex CLI backends.
+ */
+import type { ImageContent } from "@mariozechner/pi-ai";
+
+import type { MoltbotConfig } from "../config/config.js";
+import { createSubsystemLogger } from "../logging/subsystem.js";
+import { resolveUserPath } from "../utils.js";
+import { resolveSessionAgentIds } from "./agent-scope.js";
+import { makeBootstrapWarn, resolveBootstrapContextForRun } from "./bootstrap-files.js";
+import { resolveCliBackendConfig } from "./cli-backends.js";
+import { normalizeCliModel, buildSystemPrompt } from "./cli-runner/helpers.js";
+import { runCopilotAgent, checkCopilotAvailable } from "./copilot-sdk.js";
+import { resolveMoltbotDocsPath } from "./docs-path.js";
+import { resolveHeartbeatPrompt } from "../auto-reply/heartbeat.js";
+import type { ThinkLevel } from "../auto-reply/thinking.js";
+import type { EmbeddedPiRunResult } from "./pi-embedded-runner.js";
+
+const log = createSubsystemLogger("agent/copilot-cli");
+
+/**
+ * Check if the Copilot CLI backend is available.
+ */
+export function isCopilotCliAvailable(options?: { cliPath?: string }): boolean {
+  const status = checkCopilotAvailable({ cliPath: options?.cliPath });
+  return status.available && status.authenticated;
+}
+
+/**
+ * Run an agent prompt through the Copilot CLI using the SDK.
+ *
+ * This function is designed to match the signature of `runCliAgent` for
+ * compatibility with the existing CLI backend infrastructure.
+ */
+export async function runCopilotCliAgent(params: {
+  sessionId: string;
+  sessionKey?: string;
+  sessionFile: string;
+  workspaceDir: string;
+  config?: MoltbotConfig;
+  prompt: string;
+  provider?: string;
+  model?: string;
+  thinkLevel?: ThinkLevel;
+  timeoutMs: number;
+  runId: string;
+  extraSystemPrompt?: string;
+  streamParams?: import("../commands/agent/types.js").AgentStreamParams;
+  ownerNumbers?: string[];
+  cliSessionId?: string;
+  images?: ImageContent[];
+}): Promise<EmbeddedPiRunResult> {
+  const started = Date.now();
+  const resolvedWorkspace = resolveUserPath(params.workspaceDir);
+  const workspaceDir = resolvedWorkspace;
+  const provider = params.provider ?? "copilot-cli";
+
+  const backendResolved = resolveCliBackendConfig(provider, params.config);
+  if (!backendResolved) {
+    throw new Error(`Unknown CLI backend: ${provider}`);
+  }
+  const backend = backendResolved.config;
+  const modelId = (params.model ?? "gpt-4.1").trim() || "gpt-4.1";
+  const normalizedModel = normalizeCliModel(modelId, backend);
+  const modelDisplay = `${provider}/${modelId}`;
+
+  // Build system prompt with context
+  const extraSystemPrompt = [
+    params.extraSystemPrompt?.trim(),
+    "Tools are disabled in this session. Do not call tools.",
+  ]
+    .filter(Boolean)
+    .join("\n");
+
+  const sessionLabel = params.sessionKey ?? params.sessionId;
+  const { contextFiles } = await resolveBootstrapContextForRun({
+    workspaceDir,
+    config: params.config,
+    sessionKey: params.sessionKey,
+    sessionId: params.sessionId,
+    warn: makeBootstrapWarn({ sessionLabel, warn: (message) => log.warn(message) }),
+  });
+
+  const { defaultAgentId, sessionAgentId } = resolveSessionAgentIds({
+    sessionKey: params.sessionKey,
+    config: params.config,
+  });
+
+  const heartbeatPrompt =
+    sessionAgentId === defaultAgentId
+      ? resolveHeartbeatPrompt(params.config?.agents?.defaults?.heartbeat?.prompt)
+      : undefined;
+
+  const docsPath = await resolveMoltbotDocsPath({
+    workspaceDir,
+    argv1: process.argv[1],
+    cwd: process.cwd(),
+    moduleUrl: import.meta.url,
+  });
+
+  const systemPrompt = buildSystemPrompt({
+    workspaceDir,
+    config: params.config,
+    defaultThinkLevel: params.thinkLevel,
+    extraSystemPrompt,
+    ownerNumbers: params.ownerNumbers,
+    heartbeatPrompt,
+    docsPath: docsPath ?? undefined,
+    tools: [],
+    contextFiles,
+    modelDisplay,
+    agentId: sessionAgentId,
+  });
+
+  log.info(`copilot-cli exec: model=${normalizedModel} promptChars=${params.prompt.length}`);
+
+  try {
+    const result = await runCopilotAgent({
+      prompt: params.prompt,
+      model: normalizedModel,
+      cliPath: backend.command,
+      cwd: workspaceDir,
+      systemPrompt,
+      timeoutMs: params.timeoutMs,
+      sessionId: params.cliSessionId,
+      onEvent: (event) => {
+        // Forward streaming events if streamParams is provided
+        if (params.streamParams?.onDelta && event.type === "assistant.message_delta") {
+          const data = event.data as { content?: string };
+          if (typeof data.content === "string") {
+            params.streamParams.onDelta(data.content);
+          }
+        }
+      },
+    });
+
+    const text = result.text?.trim();
+    const payloads = text ? [{ text }] : undefined;
+
+    return {
+      payloads,
+      meta: {
+        durationMs: Date.now() - started,
+        agentMeta: {
+          sessionId: result.sessionId ?? params.sessionId ?? "",
+          provider,
+          model: modelId,
+        },
+      },
+    };
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    log.error("copilot-cli run failed", { error: message });
+    throw err;
+  }
+}
diff --git a/src/agents/copilot-sdk.test.ts b/src/agents/copilot-sdk.test.ts
new file mode 100644
index 000000000..00154619c
--- /dev/null
+++ b/src/agents/copilot-sdk.test.ts
@@ -0,0 +1,90 @@
+import { describe, expect, it, vi, beforeEach } from "vitest";
+
+import { checkCopilotAvailable } from "./copilot-sdk.js";
+import * as copilotCredentials from "./copilot-credentials.js";
+
+vi.mock("./copilot-credentials.js", () => ({
+  isCopilotCliInstalled: vi.fn(),
+  readCopilotAuthStatusCached: vi.fn(),
+}));
+
+describe("copilot-sdk", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe("checkCopilotAvailable", () => {
+    it("returns not available when CLI is not installed", () => {
+      vi.mocked(copilotCredentials.isCopilotCliInstalled).mockReturnValue(false);
+
+      const result = checkCopilotAvailable();
+
+      expect(result).toEqual({
+        available: false,
+        authenticated: false,
+      });
+    });
+
+    it("returns available but not authenticated when CLI is installed but not authenticated", () => {
+      vi.mocked(copilotCredentials.isCopilotCliInstalled).mockReturnValue(true);
+      vi.mocked(copilotCredentials.readCopilotAuthStatusCached).mockReturnValue({
+        authenticated: false,
+      });
+
+      const result = checkCopilotAvailable();
+
+      expect(result).toEqual({
+        available: true,
+        authenticated: false,
+      });
+    });
+
+    it("returns available and authenticated with user info when CLI is authenticated", () => {
+      vi.mocked(copilotCredentials.isCopilotCliInstalled).mockReturnValue(true);
+      vi.mocked(copilotCredentials.readCopilotAuthStatusCached).mockReturnValue({
+        authenticated: true,
+        login: "testuser",
+        avatarUrl: "https://example.com/avatar.png",
+      });
+
+      const result = checkCopilotAvailable();
+
+      expect(result).toEqual({
+        available: true,
+        authenticated: true,
+        login: "testuser",
+        avatarUrl: "https://example.com/avatar.png",
+      });
+    });
+
+    it("returns available but not authenticated when auth status is null", () => {
+      vi.mocked(copilotCredentials.isCopilotCliInstalled).mockReturnValue(true);
+      vi.mocked(copilotCredentials.readCopilotAuthStatusCached).mockReturnValue(null);
+
+      const result = checkCopilotAvailable();
+
+      expect(result).toEqual({
+        available: true,
+        authenticated: false,
+      });
+    });
+
+    it("passes cliPath option to credential functions", () => {
+      vi.mocked(copilotCredentials.isCopilotCliInstalled).mockReturnValue(true);
+      vi.mocked(copilotCredentials.readCopilotAuthStatusCached).mockReturnValue({
+        authenticated: true,
+      });
+
+      checkCopilotAvailable({ cliPath: "/custom/path/copilot" });
+
+      expect(copilotCredentials.isCopilotCliInstalled).toHaveBeenCalledWith({
+        cliPath: "/custom/path/copilot",
+      });
+      expect(copilotCredentials.readCopilotAuthStatusCached).toHaveBeenCalledWith(
+        expect.objectContaining({
+          cliPath: "/custom/path/copilot",
+        }),
+      );
+    });
+  });
+});
diff --git a/src/agents/copilot-sdk.ts b/src/agents/copilot-sdk.ts
new file mode 100644
index 000000000..0bf175ab0
--- /dev/null
+++ b/src/agents/copilot-sdk.ts
@@ -0,0 +1,292 @@
+/**
+ * GitHub Copilot SDK integration for Moltbot.
+ *
+ * This module provides a thin wrapper around the `@github/copilot-sdk` package
+ * for programmatic control of GitHub Copilot CLI via JSON-RPC.
+ */
+import type {
+  CopilotClient,
+  CopilotClientOptions,
+  CopilotSession,
+  SessionConfig,
+  SessionEvent,
+} from "@github/copilot-sdk";
+
+import { createSubsystemLogger } from "../logging/subsystem.js";
+import { isCopilotCliInstalled, readCopilotAuthStatusCached } from "./copilot-credentials.js";
+
+const log = createSubsystemLogger("agents/copilot-sdk");
+
+// Re-export SDK types that consumers may need.
+export type {
+  CopilotClient,
+  CopilotClientOptions,
+  CopilotSession,
+  SessionConfig,
+  SessionEvent,
+};
+
+/**
+ * Options for creating a Moltbot-configured Copilot client.
+ */
+export type MoltbotCopilotClientOptions = {
+  /** Path to the Copilot CLI executable (default: "copilot" from PATH). */
+  cliPath?: string;
+  /** Working directory for the CLI process. */
+  cwd?: string;
+  /** Log level for the CLI server. */
+  logLevel?: "none" | "error" | "warning" | "info" | "debug" | "all";
+  /** Auto-restart the CLI server if it crashes (default: true). */
+  autoRestart?: boolean;
+  /** Environment variables to pass to the CLI process. */
+  env?: Record<string, string | undefined>;
+};
+
+/**
+ * Check if the Copilot CLI is available and authenticated.
+ *
+ * @returns Object with `available` and `authenticated` flags, plus optional user info.
+ */
+export function checkCopilotAvailable(options?: { cliPath?: string }): {
+  available: boolean;
+  authenticated: boolean;
+  login?: string;
+  avatarUrl?: string;
+} {
+  const installed = isCopilotCliInstalled({ cliPath: options?.cliPath });
+  if (!installed) {
+    return { available: false, authenticated: false };
+  }
+
+  const authStatus = readCopilotAuthStatusCached({
+    cliPath: options?.cliPath,
+    ttlMs: 5 * 60 * 1000, // Cache for 5 minutes
+  });
+
+  if (!authStatus) {
+    return { available: true, authenticated: false };
+  }
+
+  return {
+    available: true,
+    authenticated: authStatus.authenticated,
+    login: authStatus.login,
+    avatarUrl: authStatus.avatarUrl,
+  };
+}
+
+/**
+ * Create a CopilotClient with Moltbot-specific defaults.
+ *
+ * This is a factory function that lazily imports the SDK and creates
+ * a client instance. The client should be started before use.
+ */
+export async function createCopilotClient(
+  options?: MoltbotCopilotClientOptions,
+): Promise<CopilotClient> {
+  const { CopilotClient: CopilotClientClass } = await import("@github/copilot-sdk");
+
+  const clientOptions: CopilotClientOptions = {
+    cliPath: options?.cliPath ?? "copilot",
+    cwd: options?.cwd,
+    logLevel: options?.logLevel ?? "warning",
+    autoRestart: options?.autoRestart ?? true,
+    useStdio: true, // Use stdio transport for better process control
+    autoStart: false, // We'll start manually for better error handling
+    env: options?.env,
+  };
+
+  log.info("creating copilot client", {
+    cliPath: clientOptions.cliPath,
+    cwd: clientOptions.cwd,
+    logLevel: clientOptions.logLevel,
+  });
+
+  return new CopilotClientClass(clientOptions);
+}
+
+/**
+ * Parameters for running a single-turn Copilot agent interaction.
+ */
+export type RunCopilotAgentParams = {
+  /** The prompt/message to send. */
+  prompt: string;
+  /** Model to use (e.g., "gpt-5", "gpt-4.1", "claude-sonnet-4.5"). */
+  model?: string;
+  /** Path to the Copilot CLI executable. */
+  cliPath?: string;
+  /** Working directory for the CLI process. */
+  cwd?: string;
+  /** System message content (appended to CLI defaults). */
+  systemPrompt?: string;
+  /** Timeout in milliseconds (default: 120000). */
+  timeoutMs?: number;
+  /** Session ID to resume (for multi-turn conversations). */
+  sessionId?: string;
+  /** Environment variables to pass to the CLI. */
+  env?: Record<string, string | undefined>;
+  /** Callback for streaming events. */
+  onEvent?: (event: SessionEvent) => void;
+};
+
+/**
+ * Result from a Copilot agent run.
+ */
+export type CopilotAgentResult = {
+  /** The final assistant response text. */
+  text: string;
+  /** Session ID for resuming conversations. */
+  sessionId: string;
+  /** Events received during the run. */
+  events: SessionEvent[];
+  /** Duration in milliseconds. */
+  durationMs: number;
+};
+
+/**
+ * Run a single-turn Copilot agent interaction.
+ *
+ * Creates a client, starts a session, sends the prompt, waits for completion,
+ * and cleans up. For multi-turn conversations, pass the returned `sessionId`
+ * back in subsequent calls.
+ */
+export async function runCopilotAgent(
+  params: RunCopilotAgentParams,
+): Promise<CopilotAgentResult> {
+  const started = Date.now();
+  const events: SessionEvent[] = [];
+  let finalText = "";
+
+  const client = await createCopilotClient({
+    cliPath: params.cliPath,
+    cwd: params.cwd,
+    env: params.env,
+  });
+
+  try {
+    // Start the client
+    await client.start();
+
+    // Configure session
+    const sessionConfig: SessionConfig = {
+      model: params.model,
+      sessionId: params.sessionId,
+    };
+
+    // Add system message if provided
+    if (params.systemPrompt) {
+      sessionConfig.systemMessage = {
+        mode: "append",
+        content: params.systemPrompt,
+      };
+    }
+
+    // Create or resume session
+    let session: CopilotSession;
+    if (params.sessionId) {
+      session = await client.resumeSession(params.sessionId, {
+        streaming: true,
+      });
+    } else {
+      session = await client.createSession(sessionConfig);
+    }
+
+    const sessionId = session.sessionId;
+
+    // Set up event handler
+    const unsubscribe = session.on((event: SessionEvent) => {
+      events.push(event);
+      params.onEvent?.(event);
+
+      // Capture final text from assistant message events
+      if (event.type === "assistant.message") {
+        const data = event.data as { content?: string };
+        if (typeof data.content === "string") {
+          finalText = data.content;
+        }
+      }
+    });
+
+    try {
+      // Send the message and wait for completion
+      const result = await session.sendAndWait(
+        { prompt: params.prompt },
+        params.timeoutMs ?? 120000,
+      );
+
+      // Extract text from result if available
+      if (result?.data?.content && typeof result.data.content === "string") {
+        finalText = result.data.content;
+      }
+
+      return {
+        text: finalText,
+        sessionId,
+        events,
+        durationMs: Date.now() - started,
+      };
+    } finally {
+      unsubscribe();
+      // Note: We don't destroy the session if sessionId was provided for resumption
+      if (!params.sessionId) {
+        await session.destroy().catch(() => {
+          // Ignore cleanup errors
+        });
+      }
+    }
+  } finally {
+    // Always stop the client
+    await client.stop().catch(() => {
+      // Ignore cleanup errors
+    });
+  }
+}
+
+/**
+ * List available Copilot sessions.
+ */
+export async function listCopilotSessions(options?: {
+  cliPath?: string;
+  cwd?: string;
+}): Promise<Array<{ sessionId: string; model?: string; createdAt?: string }>> {
+  const client = await createCopilotClient({
+    cliPath: options?.cliPath,
+    cwd: options?.cwd,
+  });
+
+  try {
+    await client.start();
+    const sessions = await client.listSessions();
+    return sessions.map((s) => ({
+      sessionId: s.sessionId,
+      model: s.model,
+      createdAt: s.createdAt,
+    }));
+  } finally {
+    await client.stop().catch(() => {});
+  }
+}
+
+/**
+ * Delete a Copilot session.
+ */
+export async function deleteCopilotSession(
+  sessionId: string,
+  options?: {
+    cliPath?: string;
+    cwd?: string;
+  },
+): Promise<void> {
+  const client = await createCopilotClient({
+    cliPath: options?.cliPath,
+    cwd: options?.cwd,
+  });
+
+  try {
+    await client.start();
+    await client.deleteSession(sessionId);
+    log.info("deleted copilot session", { sessionId });
+  } finally {
+    await client.stop().catch(() => {});
+  }
+}
diff --git a/src/agents/model-selection.ts b/src/agents/model-selection.ts
index 8d6db36de..d21c95db2 100644
--- a/src/agents/model-selection.ts
+++ b/src/agents/model-selection.ts
@@ -36,6 +36,7 @@ export function isCliProvider(provider: string, cfg?: MoltbotConfig): boolean {
   const normalized = normalizeProviderId(provider);
   if (normalized === "claude-cli") return true;
   if (normalized === "codex-cli") return true;
+  if (normalized === "copilot-cli") return true;
   const backends = cfg?.agents?.defaults?.cliBackends ?? {};
   return Object.keys(backends).some((key) => normalizeProviderId(key) === normalized);
 }