diff --git a/docs/channels/googlechat.md b/docs/channels/googlechat.md
index 3e721503a..3cd60b73f 100644
--- a/docs/channels/googlechat.md
+++ b/docs/channels/googlechat.md
@@ -5,9 +5,7 @@ read_when:
 ---
 # Google Chat (Chat API)
 
-Status: ready for DMs + spaces via Google Chat API webhooks (HTTP only).
-
-## Quick setup (beginner)
+## Service Account Setup
 1) Create a Google Cloud project and enable the **Google Chat API**.
    - Go to: [Google Chat API Credentials](https://console.cloud.google.com/apis/api/chat.googleapis.com/credentials)
    - Enable the API if it is not already enabled.
@@ -46,6 +44,71 @@ Status: ready for DMs + spaces via Google Chat API webhooks (HTTP only).
 8) Set the webhook audience type + value (matches your Chat app config).
 9) Start the gateway. Google Chat will POST to your webhook path.
 
+## User OAuth (optional, enables reactions)
+Service account covers almost all features, but **reactions and user-attributed actions require user OAuth**.
+
+### Option A: Use gog OAuth (recommended if you already use `gog`)
+If you already use `gog` for Google Workspace, you can reuse its OAuth client + refresh token.
+`gog` stores the OAuth client credentials JSON in your config directory and the refresh token in your system keyring. 
+
+1) Ensure `gog` is already authorized:
+   ```bash
+   gog auth list
+   ```
+2) Configure Google Chat to reuse `gog`:
+   ```json5
+   {
+     channels: {
+       googlechat: {
+         oauthFromGog: true,
+         // Optional when multiple gog clients or accounts are configured:
+         gogAccount: "you@example.com",
+         gogClient: "work"
+       }
+     }
+   }
+   ```
+3) Ensure `gog` can access its keyring on the gateway host.
+   - `gog` stores refresh tokens in the system keychain by default (not inside `credentials.json`). 
+   - For headless systems (systemd, SSH-only), switch to file keyring + password (see `gog` docs). 
+     - Set `GOG_KEYRING_BACKEND=file` and `GOG_KEYRING_PASSWORD=...` for the gateway service.
+     - The file keyring lives under your gog config directory (for example `~/.config/gogcli/keyring/`).
+4) Verify `gog` is visible to clawdbot and ask it to run:
+   ```bash
+   Run `gog auth tokens list --json` and tell me if you can access services.
+   ```
+   This lists token keys only (no secrets). If this fails, install `gog` on the gateway host and ensure the keyring is accessible.
+   For non-interactive services, set `GOG_KEYRING_PASSWORD` in the gateway environment so `gog` can unlock the keyring.
+5) Set `typingIndicator` to "reaction" in your clawdbot config.
+```json5
+{
+  channels: {
+    "googlechat": {
+      actions: { reactions: true },
+      typingIndicator: "reaction",
+    }
+  }
+}
+```
+
+Clawdbot reads `gog` OAuth client files from:
+- `~/.config/gogcli/credentials.json`
+- `~/.config/gogcli/credentials-<client>.json`
+- `~/.config/gogcli/credentials-<domain>.json` (or macOS equivalent) 
+
+Clawdbot queries `gog auth tokens list --json` to discover which account to use, then runs `gog auth tokens export <email> --out <tmp>` to read the refresh token. If you have multiple gog accounts, set `gogAccount` (or `GOG_ACCOUNT`) to pick the right one. If this fails, set `oauthRefreshToken` manually.
+
+### Option B: Manual OAuth
+1) Configure OAuth consent + create OAuth client credentials in your Google Cloud project (desktop app recommended). 
+2) Use an OAuth 2.0 flow to request **offline** access and collect a refresh token.
+   - Required scopes for reactions include:
+     - `https://www.googleapis.com/auth/chat.messages.reactions.create`
+     - `https://www.googleapis.com/auth/chat.messages.reactions`
+     - (or) `https://www.googleapis.com/auth/chat.messages`
+3) Save the client credentials + refresh token in your config or env vars (examples below).
+
+**Tip:** user OAuth actions are attributed to the user in Google Chat.
+
 ## Add to Google Chat
 Once the gateway is running and your email is added to the visibility list:
 1) Go to [Google Chat](https://chat.google.com/).
@@ -144,6 +207,17 @@ Use these identifiers for delivery and allowlists:
     "googlechat": {
       enabled: true,
       serviceAccountFile: "/path/to/service-account.json",
+      // Optional: user OAuth for reactions + user-attributed actions
+      oauthClientFile: "/path/to/oauth-client.json",
+      oauthRefreshToken: "1//0g...",
+      // Or reuse gog:
+      // oauthFromGog: true,
+      // gogAccount: "you@example.com",
+      // gogClient: "work",
+      // Or explicit fields:
+      // oauthClientId: "123456.apps.googleusercontent.com",
+      // oauthClientSecret: "GOCSPX-...",
+      // oauthRedirectUri: "https://your.host/googlechat/oauth/callback",
       audienceType: "app-url",
       audience: "https://gateway.example.com/googlechat",
       webhookPath: "/googlechat",
@@ -171,6 +245,11 @@ Use these identifiers for delivery and allowlists:
 
 Notes:
 - Service account credentials can also be passed inline with `serviceAccount` (JSON string).
+- User OAuth can be provided via `oauthClientFile` + `oauthRefreshToken` or the explicit client fields.
+- Env options (default account): `GOOGLE_CHAT_OAUTH_CLIENT_ID`, `GOOGLE_CHAT_OAUTH_CLIENT_SECRET`,
+  `GOOGLE_CHAT_OAUTH_REDIRECT_URI`, `GOOGLE_CHAT_OAUTH_CLIENT_FILE`,
+  `GOOGLE_CHAT_OAUTH_REFRESH_TOKEN`, `GOOGLE_CHAT_OAUTH_REFRESH_TOKEN_FILE`.
+- `oauthFromGog` reuses the `gog` keyring. Use `gogAccount`/`gogClient` (or `GOG_ACCOUNT`/`GOG_CLIENT`) when multiple accounts or clients exist.
 - Default webhook path is `/googlechat` if `webhookPath` isn’t set.
 - Reactions are available via the `reactions` tool and `channels action` when `actions.reactions` is enabled.
 - `typingIndicator` supports `none`, `message` (default), and `reaction` (reaction requires user OAuth).
diff --git a/docs/gateway/configuration.md b/docs/gateway/configuration.md
index 5a00ea9cd..add47f45b 100644
--- a/docs/gateway/configuration.md
+++ b/docs/gateway/configuration.md
@@ -1140,6 +1140,12 @@ Multi-account support lives under `channels.googlechat.accounts` (see the multi-
     "googlechat": {
       enabled: true,
       serviceAccountFile: "/path/to/service-account.json",
+      oauthClientFile: "/path/to/oauth-client.json",
+      oauthRefreshToken: "1//0g...",
+      // Or reuse gog OAuth:
+      // oauthFromGog: true,
+      // gogAccount: "you@example.com",
+      // gogClient: "work",
       audienceType: "app-url",             // app-url | project-number
       audience: "https://gateway.example.com/googlechat",
       webhookPath: "/googlechat",
@@ -1164,6 +1170,12 @@ Multi-account support lives under `channels.googlechat.accounts` (see the multi-
 Notes:
 - Service account JSON can be inline (`serviceAccount`) or file-based (`serviceAccountFile`).
 - Env fallbacks for the default account: `GOOGLE_CHAT_SERVICE_ACCOUNT` or `GOOGLE_CHAT_SERVICE_ACCOUNT_FILE`.
+- User OAuth can be provided via `oauthClientFile` + `oauthRefreshToken` (or explicit client fields).
+- Env fallbacks for user OAuth (default account): `GOOGLE_CHAT_OAUTH_CLIENT_ID`,
+  `GOOGLE_CHAT_OAUTH_CLIENT_SECRET`, `GOOGLE_CHAT_OAUTH_REDIRECT_URI`,
+  `GOOGLE_CHAT_OAUTH_CLIENT_FILE`, `GOOGLE_CHAT_OAUTH_REFRESH_TOKEN`,
+  `GOOGLE_CHAT_OAUTH_REFRESH_TOKEN_FILE`.
+- `oauthFromGog` reuses `gog` OAuth credentials; `gogAccount`/`gogClient` (or `GOG_ACCOUNT`/`GOG_CLIENT`) select the account/client.
 - `audienceType` + `audience` must match the Chat app’s webhook auth config.
 - Use `spaces/<spaceId>` or `users/<userId|email>` when setting delivery targets.
 
diff --git a/extensions/googlechat/src/accounts.ts b/extensions/googlechat/src/accounts.ts
index ade8a38ae..c8e5c7e26 100644
--- a/extensions/googlechat/src/accounts.ts
+++ b/extensions/googlechat/src/accounts.ts
@@ -2,8 +2,11 @@ import type { OpenClawConfig } from "openclaw/plugin-sdk";
 import { DEFAULT_ACCOUNT_ID, normalizeAccountId } from "openclaw/plugin-sdk";
 
 import type { GoogleChatAccountConfig, GoogleChatConfig } from "./types.config.js";
+import { readGogRefreshTokenSync, resolveGogCredentialsFile } from "./gog.js";
 
-export type GoogleChatCredentialSource = "file" | "inline" | "env" | "none";
+export type GoogleChatAppCredentialSource = "file" | "inline" | "env" | "none";
+export type GoogleChatUserCredentialSource = "file" | "inline" | "env" | "none";
+export type GoogleChatCredentialSource = "file" | "inline" | "env" | "oauth" | "none";
 
 export type ResolvedGoogleChatAccount = {
   accountId: string;
@@ -11,12 +14,21 @@ export type ResolvedGoogleChatAccount = {
   enabled: boolean;
   config: GoogleChatAccountConfig;
   credentialSource: GoogleChatCredentialSource;
+  appCredentialSource: GoogleChatAppCredentialSource;
+  userCredentialSource: GoogleChatUserCredentialSource;
   credentials?: Record<string, unknown>;
   credentialsFile?: string;
 };
 
 const ENV_SERVICE_ACCOUNT = "GOOGLE_CHAT_SERVICE_ACCOUNT";
 const ENV_SERVICE_ACCOUNT_FILE = "GOOGLE_CHAT_SERVICE_ACCOUNT_FILE";
+const ENV_GOG_ACCOUNT = "GOG_ACCOUNT";
+const ENV_GOG_CLIENT = "GOG_CLIENT";
+const ENV_OAUTH_CLIENT_ID = "GOOGLE_CHAT_OAUTH_CLIENT_ID";
+const ENV_OAUTH_CLIENT_SECRET = "GOOGLE_CHAT_OAUTH_CLIENT_SECRET";
+const ENV_OAUTH_CLIENT_FILE = "GOOGLE_CHAT_OAUTH_CLIENT_FILE";
+const ENV_OAUTH_REFRESH_TOKEN = "GOOGLE_CHAT_OAUTH_REFRESH_TOKEN";
+const ENV_OAUTH_REFRESH_TOKEN_FILE = "GOOGLE_CHAT_OAUTH_REFRESH_TOKEN_FILE";
 
 function listConfiguredAccountIds(cfg: OpenClawConfig): string[] {
   const accounts = (cfg.channels?.["googlechat"] as GoogleChatConfig | undefined)?.accounts;
@@ -69,13 +81,17 @@ function parseServiceAccount(value: unknown): Record<string, unknown> | null {
   }
 }
 
+function hasNonEmptyString(value: unknown): boolean {
+  return typeof value === "string" && value.trim().length > 0;
+}
+
 function resolveCredentialsFromConfig(params: {
   accountId: string;
   account: GoogleChatAccountConfig;
 }): {
   credentials?: Record<string, unknown>;
   credentialsFile?: string;
-  source: GoogleChatCredentialSource;
+  source: GoogleChatAppCredentialSource;
 } {
   const { account, accountId } = params;
   const inline = parseServiceAccount(account.serviceAccount);
@@ -103,6 +119,53 @@ function resolveCredentialsFromConfig(params: {
   return { source: "none" };
 }
 
+function resolveUserAuthSource(params: {
+  accountId: string;
+  account: GoogleChatAccountConfig;
+}): GoogleChatUserCredentialSource {
+  const { account, accountId } = params;
+  const gogAccount = account.gogAccount?.trim() || process.env[ENV_GOG_ACCOUNT]?.trim() || undefined;
+  const gogClient = account.gogClient?.trim() || process.env[ENV_GOG_CLIENT]?.trim() || undefined;
+  const clientId = account.oauthClientId?.trim();
+  const clientSecret = account.oauthClientSecret?.trim();
+  const clientFile = account.oauthClientFile?.trim();
+  const refreshToken = account.oauthRefreshToken?.trim();
+  const refreshTokenFile = account.oauthRefreshTokenFile?.trim();
+
+  const hasInlineClient = hasNonEmptyString(clientId) && hasNonEmptyString(clientSecret);
+  const hasFileClient = hasNonEmptyString(clientFile);
+  const hasInlineRefresh = hasNonEmptyString(refreshToken);
+  const hasFileRefresh = hasNonEmptyString(refreshTokenFile);
+  const hasGogClient = account.oauthFromGog
+    ? Boolean(resolveGogCredentialsFile({ gogClient, gogAccount }))
+    : false;
+  const hasGogRefresh = account.oauthFromGog
+    ? Boolean(readGogRefreshTokenSync({ gogAccount, gogClient }))
+    : false;
+
+  const hasEnvClient =
+    accountId === DEFAULT_ACCOUNT_ID &&
+    hasNonEmptyString(process.env[ENV_OAUTH_CLIENT_ID]) &&
+    hasNonEmptyString(process.env[ENV_OAUTH_CLIENT_SECRET]);
+  const hasEnvClientFile =
+    accountId === DEFAULT_ACCOUNT_ID && hasNonEmptyString(process.env[ENV_OAUTH_CLIENT_FILE]);
+  const hasEnvRefresh =
+    accountId === DEFAULT_ACCOUNT_ID && hasNonEmptyString(process.env[ENV_OAUTH_REFRESH_TOKEN]);
+  const hasEnvRefreshFile =
+    accountId === DEFAULT_ACCOUNT_ID &&
+    hasNonEmptyString(process.env[ENV_OAUTH_REFRESH_TOKEN_FILE]);
+
+  const hasClient =
+    hasInlineClient || hasFileClient || hasEnvClient || hasEnvClientFile || hasGogClient;
+  const hasRefresh =
+    hasInlineRefresh || hasFileRefresh || hasEnvRefresh || hasEnvRefreshFile || hasGogRefresh;
+  if (!hasClient || !hasRefresh) return "none";
+
+  if (hasFileClient || hasFileRefresh) return "file";
+  if (hasEnvClient || hasEnvClientFile || hasEnvRefresh || hasEnvRefreshFile) return "env";
+  return "inline";
+}
+
 export function resolveGoogleChatAccount(params: {
   cfg: OpenClawConfig;
   accountId?: string | null;
@@ -114,13 +177,22 @@ export function resolveGoogleChatAccount(params: {
   const accountEnabled = merged.enabled !== false;
   const enabled = baseEnabled && accountEnabled;
   const credentials = resolveCredentialsFromConfig({ accountId, account: merged });
+  const userCredentialSource = resolveUserAuthSource({ accountId, account: merged });
+  const credentialSource =
+    credentials.source !== "none"
+      ? credentials.source
+      : userCredentialSource !== "none"
+        ? "oauth"
+        : "none";
 
   return {
     accountId,
     name: merged.name?.trim() || undefined,
     enabled,
     config: merged,
-    credentialSource: credentials.source,
+    credentialSource,
+    appCredentialSource: credentials.source,
+    userCredentialSource,
     credentials: credentials.credentials,
     credentialsFile: credentials.credentialsFile,
   };
diff --git a/extensions/googlechat/src/actions.ts b/extensions/googlechat/src/actions.ts
index cecce7b14..3053834fc 100644
--- a/extensions/googlechat/src/actions.ts
+++ b/extensions/googlechat/src/actions.ts
@@ -32,6 +32,7 @@ function listEnabledAccounts(cfg: OpenClawConfig) {
 
 function isReactionsEnabled(accounts: ReturnType<typeof listEnabledAccounts>, cfg: OpenClawConfig) {
   for (const account of accounts) {
+    if (account.userCredentialSource === "none") continue;
     const gate = createActionGate(
       (account.config.actions ?? (cfg.channels?.["googlechat"] as { actions?: unknown })?.actions) as Record<
         string,
@@ -119,6 +120,9 @@ export const googlechatMessageActions: ChannelMessageActionAdapter = {
     }
 
     if (action === "react") {
+      if (account.userCredentialSource === "none") {
+        throw new Error("Google Chat reactions require user OAuth credentials.");
+      }
       const messageName = readStringParam(params, "messageId", { required: true });
       const { emoji, remove, isEmpty } = readReactionParams(params, {
         removeErrorMessage: "Emoji is required to remove a Google Chat reaction.",
@@ -147,6 +151,9 @@ export const googlechatMessageActions: ChannelMessageActionAdapter = {
     }
 
     if (action === "reactions") {
+      if (account.userCredentialSource === "none") {
+        throw new Error("Google Chat reactions require user OAuth credentials.");
+      }
       const messageName = readStringParam(params, "messageId", { required: true });
       const limit = readNumberParam(params, "limit", { integer: true });
       const reactions = await listGoogleChatReactions({
diff --git a/extensions/googlechat/src/api.test.ts b/extensions/googlechat/src/api.test.ts
index 959b396df..9b0f1487d 100644
--- a/extensions/googlechat/src/api.test.ts
+++ b/extensions/googlechat/src/api.test.ts
@@ -11,6 +11,8 @@ const account = {
   accountId: "default",
   enabled: true,
   credentialSource: "inline",
+  appCredentialSource: "inline",
+  userCredentialSource: "none",
   config: {},
 } as ResolvedGoogleChatAccount;
 
diff --git a/extensions/googlechat/src/api.ts b/extensions/googlechat/src/api.ts
index b487a2627..38be48a5f 100644
--- a/extensions/googlechat/src/api.ts
+++ b/extensions/googlechat/src/api.ts
@@ -1,7 +1,7 @@
 import crypto from "node:crypto";
 
 import type { ResolvedGoogleChatAccount } from "./accounts.js";
-import { getGoogleChatAccessToken } from "./auth.js";
+import { getGoogleChatAccessToken, type GoogleChatAuthMode } from "./auth.js";
 import type { GoogleChatReaction } from "./types.js";
 
 const CHAT_API_BASE = "https://chat.googleapis.com/v1";
@@ -11,8 +11,9 @@ async function fetchJson<T>(
   account: ResolvedGoogleChatAccount,
   url: string,
   init: RequestInit,
+  options?: { authMode?: GoogleChatAuthMode },
 ): Promise<T> {
-  const token = await getGoogleChatAccessToken(account);
+  const token = await getGoogleChatAccessToken(account, { mode: options?.authMode });
   const res = await fetch(url, {
     ...init,
     headers: {
@@ -32,8 +33,9 @@ async function fetchOk(
   account: ResolvedGoogleChatAccount,
   url: string,
   init: RequestInit,
+  options?: { authMode?: GoogleChatAuthMode },
 ): Promise<void> {
-  const token = await getGoogleChatAccessToken(account);
+  const token = await getGoogleChatAccessToken(account, { mode: options?.authMode });
   const res = await fetch(url, {
     ...init,
     headers: {
@@ -51,9 +53,9 @@ async function fetchBuffer(
   account: ResolvedGoogleChatAccount,
   url: string,
   init?: RequestInit,
-  options?: { maxBytes?: number },
+  options?: { maxBytes?: number; authMode?: GoogleChatAuthMode },
 ): Promise<{ buffer: Buffer; contentType?: string }> {
-  const token = await getGoogleChatAccessToken(account);
+  const token = await getGoogleChatAccessToken(account, { mode: options?.authMode });
   const res = await fetch(url, {
     ...init,
     headers: {
@@ -115,10 +117,14 @@ export async function sendGoogleChatMessage(params: {
     }));
   }
   const url = `${CHAT_API_BASE}/${space}/messages`;
-  const result = await fetchJson<{ name?: string }>(account, url, {
-    method: "POST",
-    body: JSON.stringify(body),
-  });
+  const result = await fetchJson<{ name?: string }>(
+    account,
+    url,
+    {
+      method: "POST",
+      body: JSON.stringify(body),
+    },
+  );
   return result ? { messageName: result.name } : null;
 }
 
@@ -129,10 +135,14 @@ export async function updateGoogleChatMessage(params: {
 }): Promise<{ messageName?: string }> {
   const { account, messageName, text } = params;
   const url = `${CHAT_API_BASE}/${messageName}?updateMask=text`;
-  const result = await fetchJson<{ name?: string }>(account, url, {
-    method: "PATCH",
-    body: JSON.stringify({ text }),
-  });
+  const result = await fetchJson<{ name?: string }>(
+    account,
+    url,
+    {
+      method: "PATCH",
+      body: JSON.stringify({ text }),
+    },
+  );
   return { messageName: result.name };
 }
 
@@ -202,10 +212,15 @@ export async function createGoogleChatReaction(params: {
 }): Promise<GoogleChatReaction> {
   const { account, messageName, emoji } = params;
   const url = `${CHAT_API_BASE}/${messageName}/reactions`;
-  return await fetchJson<GoogleChatReaction>(account, url, {
-    method: "POST",
-    body: JSON.stringify({ emoji: { unicode: emoji } }),
-  });
+  return await fetchJson<GoogleChatReaction>(
+    account,
+    url,
+    {
+      method: "POST",
+      body: JSON.stringify({ emoji: { unicode: emoji } }),
+    },
+    { authMode: "user" },
+  );
 }
 
 export async function listGoogleChatReactions(params: {
@@ -216,9 +231,14 @@ export async function listGoogleChatReactions(params: {
   const { account, messageName, limit } = params;
   const url = new URL(`${CHAT_API_BASE}/${messageName}/reactions`);
   if (limit && limit > 0) url.searchParams.set("pageSize", String(limit));
-  const result = await fetchJson<{ reactions?: GoogleChatReaction[] }>(account, url.toString(), {
-    method: "GET",
-  });
+  const result = await fetchJson<{ reactions?: GoogleChatReaction[] }>(
+    account,
+    url.toString(),
+    {
+      method: "GET",
+    },
+    { authMode: "user" },
+  );
   return result.reactions ?? [];
 }
 
@@ -228,7 +248,7 @@ export async function deleteGoogleChatReaction(params: {
 }): Promise<void> {
   const { account, reactionName } = params;
   const url = `${CHAT_API_BASE}/${reactionName}`;
-  await fetchOk(account, url, { method: "DELETE" });
+  await fetchOk(account, url, { method: "DELETE" }, { authMode: "user" });
 }
 
 export async function findGoogleChatDirectMessage(params: {
diff --git a/extensions/googlechat/src/auth.ts b/extensions/googlechat/src/auth.ts
index 681ea6c22..64be9f723 100644
--- a/extensions/googlechat/src/auth.ts
+++ b/extensions/googlechat/src/auth.ts
@@ -1,6 +1,9 @@
 import { GoogleAuth, OAuth2Client } from "google-auth-library";
+import { DEFAULT_ACCOUNT_ID } from "clawdbot/plugin-sdk";
 
 import type { ResolvedGoogleChatAccount } from "./accounts.js";
+import { readJsonFile, readRefreshTokenFromFile } from "./file-utils.js";
+import { readGogRefreshTokenSync, resolveGogCredentialsFile } from "./gog.js";
 
 const CHAT_SCOPE = "https://www.googleapis.com/auth/chat.bot";
 const CHAT_ISSUER = "chat@system.gserviceaccount.com";
@@ -10,6 +13,7 @@ const CHAT_CERTS_URL =
   "https://www.googleapis.com/service_accounts/v1/metadata/x509/chat@system.gserviceaccount.com";
 
 const authCache = new Map<string, { key: string; auth: GoogleAuth }>();
+const oauthCache = new Map<string, { key: string; client: OAuth2Client }>();
 const verifyClient = new OAuth2Client();
 
 let cachedCerts: { fetchedAt: number; certs: Record<string, string> } | null = null;
@@ -42,7 +46,7 @@ function getAuthInstance(account: ResolvedGoogleChatAccount): GoogleAuth {
   return auth;
 }
 
-export async function getGoogleChatAccessToken(
+export async function getGoogleChatAppAccessToken(
   account: ResolvedGoogleChatAccount,
 ): Promise<string> {
   const auth = getAuthInstance(account);
@@ -55,6 +59,146 @@ export async function getGoogleChatAccessToken(
   return token;
 }
 
+const ENV_OAUTH_CLIENT_ID = "GOOGLE_CHAT_OAUTH_CLIENT_ID";
+const ENV_OAUTH_CLIENT_SECRET = "GOOGLE_CHAT_OAUTH_CLIENT_SECRET";
+const ENV_OAUTH_REDIRECT_URI = "GOOGLE_CHAT_OAUTH_REDIRECT_URI";
+const ENV_OAUTH_CLIENT_FILE = "GOOGLE_CHAT_OAUTH_CLIENT_FILE";
+const ENV_OAUTH_REFRESH_TOKEN = "GOOGLE_CHAT_OAUTH_REFRESH_TOKEN";
+const ENV_OAUTH_REFRESH_TOKEN_FILE = "GOOGLE_CHAT_OAUTH_REFRESH_TOKEN_FILE";
+const ENV_GOG_ACCOUNT = "GOG_ACCOUNT";
+const ENV_GOG_CLIENT = "GOG_CLIENT";
+
+type OAuthClientConfig = {
+  clientId: string;
+  clientSecret: string;
+  redirectUri?: string;
+};
+
+function parseOAuthClientJson(raw: unknown): OAuthClientConfig | null {
+  if (!raw || typeof raw !== "object") return null;
+  const record = raw as Record<string, unknown>;
+  const container =
+    (record.web as Record<string, unknown> | undefined) ??
+    (record.installed as Record<string, unknown> | undefined) ??
+    record;
+  const clientId = typeof container.client_id === "string" ? container.client_id.trim() : "";
+  const clientSecret =
+    typeof container.client_secret === "string" ? container.client_secret.trim() : "";
+  const redirect =
+    Array.isArray(container.redirect_uris) && typeof container.redirect_uris[0] === "string"
+      ? container.redirect_uris[0].trim()
+      : "";
+  if (!clientId || !clientSecret) return null;
+  return { clientId, clientSecret, redirectUri: redirect || undefined };
+}
+
+function resolveOAuthClientConfig(account: ResolvedGoogleChatAccount): OAuthClientConfig | null {
+  const cfg = account.config;
+  const gogAccount = cfg.gogAccount?.trim() || process.env[ENV_GOG_ACCOUNT]?.trim() || undefined;
+  const gogClient = cfg.gogClient?.trim() || process.env[ENV_GOG_CLIENT]?.trim() || undefined;
+  const inlineId = cfg.oauthClientId?.trim();
+  const inlineSecret = cfg.oauthClientSecret?.trim();
+  const inlineRedirect = cfg.oauthRedirectUri?.trim();
+  if (inlineId && inlineSecret) {
+    return {
+      clientId: inlineId,
+      clientSecret: inlineSecret,
+      redirectUri: inlineRedirect || undefined,
+    };
+  }
+
+  const filePath = cfg.oauthClientFile?.trim();
+  if (filePath) {
+    const parsed = parseOAuthClientJson(readJsonFile(filePath));
+    if (parsed) return parsed;
+  }
+
+  if (cfg.oauthFromGog) {
+    const gogCredentials = resolveGogCredentialsFile({ gogClient, gogAccount });
+    if (gogCredentials) {
+      const parsed = parseOAuthClientJson(readJsonFile(gogCredentials));
+      if (parsed) return parsed;
+    }
+  }
+
+  if (account.accountId === DEFAULT_ACCOUNT_ID) {
+    const envId = process.env[ENV_OAUTH_CLIENT_ID]?.trim();
+    const envSecret = process.env[ENV_OAUTH_CLIENT_SECRET]?.trim();
+    const envRedirect = process.env[ENV_OAUTH_REDIRECT_URI]?.trim();
+    if (envId && envSecret) {
+      return { clientId: envId, clientSecret: envSecret, redirectUri: envRedirect || undefined };
+    }
+    const envFile = process.env[ENV_OAUTH_CLIENT_FILE]?.trim();
+    if (envFile) {
+      const parsed = parseOAuthClientJson(readJsonFile(envFile));
+      if (parsed) return parsed;
+    }
+  }
+
+  return null;
+}
+
+function resolveOAuthRefreshToken(account: ResolvedGoogleChatAccount): string | null {
+  const cfg = account.config;
+  const gogAccount = cfg.gogAccount?.trim() || process.env[ENV_GOG_ACCOUNT]?.trim() || undefined;
+  const gogClient = cfg.gogClient?.trim() || process.env[ENV_GOG_CLIENT]?.trim() || undefined;
+  if (cfg.oauthRefreshToken?.trim()) return cfg.oauthRefreshToken.trim();
+
+  const tokenFile = cfg.oauthRefreshTokenFile?.trim();
+  if (tokenFile) {
+    const token = readRefreshTokenFromFile(tokenFile);
+    if (token) return token;
+  }
+
+  if (cfg.oauthFromGog) {
+    const token = readGogRefreshTokenSync({ gogAccount, gogClient });
+    if (token) return token;
+  }
+
+  if (account.accountId === DEFAULT_ACCOUNT_ID) {
+    const envToken = process.env[ENV_OAUTH_REFRESH_TOKEN]?.trim();
+    if (envToken) return envToken;
+    const envFile = process.env[ENV_OAUTH_REFRESH_TOKEN_FILE]?.trim();
+    if (envFile) {
+      const token = readRefreshTokenFromFile(envFile);
+      if (token) return token;
+    }
+  }
+  return null;
+}
+
+function getOAuthClient(account: ResolvedGoogleChatAccount): OAuth2Client {
+  const clientConfig = resolveOAuthClientConfig(account);
+  const refreshToken = resolveOAuthRefreshToken(account);
+  if (!clientConfig || !refreshToken) {
+    throw new Error("Missing Google Chat OAuth client credentials or refresh token");
+  }
+  const key = `${clientConfig.clientId}:${clientConfig.clientSecret}:${clientConfig.redirectUri ?? ""}:${refreshToken}`;
+  const cached = oauthCache.get(account.accountId);
+  if (cached && cached.key === key) return cached.client;
+
+  const client = new OAuth2Client(
+    clientConfig.clientId,
+    clientConfig.clientSecret,
+    clientConfig.redirectUri,
+  );
+  client.setCredentials({ refresh_token: refreshToken });
+  oauthCache.set(account.accountId, { key, client });
+  return client;
+}
+
+export async function getGoogleChatUserAccessToken(
+  account: ResolvedGoogleChatAccount,
+): Promise<string> {
+  const client = getOAuthClient(account);
+  const access = await client.getAccessToken();
+  const token = typeof access === "string" ? access : access?.token;
+  if (!token) {
+    throw new Error("Missing Google Chat OAuth access token");
+  }
+  return token;
+}
+
 async function fetchChatCerts(): Promise<Record<string, string>> {
   const now = Date.now();
   if (cachedCerts && now - cachedCerts.fetchedAt < 10 * 60 * 1000) {
@@ -71,6 +215,25 @@ async function fetchChatCerts(): Promise<Record<string, string>> {
 
 export type GoogleChatAudienceType = "app-url" | "project-number";
 
+export type GoogleChatAuthMode = "auto" | "app" | "user";
+
+export async function getGoogleChatAccessToken(
+  account: ResolvedGoogleChatAccount,
+  options?: { mode?: GoogleChatAuthMode },
+): Promise<string> {
+  const mode = options?.mode ?? "auto";
+  if (mode === "user") {
+    return await getGoogleChatUserAccessToken(account);
+  }
+  if (mode === "app") {
+    return await getGoogleChatAppAccessToken(account);
+  }
+  if (account.appCredentialSource !== "none") {
+    return await getGoogleChatAppAccessToken(account);
+  }
+  return await getGoogleChatUserAccessToken(account);
+}
+
 export async function verifyGoogleChatRequest(params: {
   bearer?: string | null;
   audienceType?: GoogleChatAudienceType | null;
diff --git a/extensions/googlechat/src/channel.ts b/extensions/googlechat/src/channel.ts
index da332abb9..2a587522c 100644
--- a/extensions/googlechat/src/channel.ts
+++ b/extensions/googlechat/src/channel.ts
@@ -149,6 +149,15 @@ export const googlechatPlugin: ChannelPlugin<ResolvedGoogleChatAccount> = {
         clearBaseFields: [
           "serviceAccount",
           "serviceAccountFile",
+          "oauthClientId",
+          "oauthClientSecret",
+          "oauthRedirectUri",
+          "oauthClientFile",
+          "oauthRefreshToken",
+          "oauthRefreshTokenFile",
+          "oauthFromGog",
+          "gogAccount",
+          "gogClient",
           "audienceType",
           "audience",
           "webhookPath",
@@ -158,6 +167,12 @@ export const googlechatPlugin: ChannelPlugin<ResolvedGoogleChatAccount> = {
         ],
       }),
     isConfigured: (account) => account.credentialSource !== "none",
+    unconfiguredReason: (account) => {
+      if (account.config.oauthFromGog) {
+        return "Google Chat OAuth from gog is enabled but no gog credentials were found. Ensure gog is installed, the gateway can access its keyring, or set oauthRefreshToken/oauthClientFile.";
+      }
+      return "Google Chat credentials are missing. Configure a service account or user OAuth.";
+    },
     describeAccount: (account) => ({
       accountId: account.accountId,
       name: account.name,
@@ -298,10 +313,29 @@ export const googlechatPlugin: ChannelPlugin<ResolvedGoogleChatAccount> = {
       }),
     validateInput: ({ accountId, input }) => {
       if (input.useEnv && accountId !== DEFAULT_ACCOUNT_ID) {
-        return "GOOGLE_CHAT_SERVICE_ACCOUNT env vars can only be used for the default account.";
+        return "Google Chat env credentials can only be used for the default account.";
       }
-      if (!input.useEnv && !input.token && !input.tokenFile) {
-        return "Google Chat requires --token (service account JSON) or --token-file.";
+      const hasServiceAccount = Boolean(input.token || input.tokenFile);
+      const hasOauthInput = Boolean(
+        input.oauthFromGog ||
+          input.oauthClientId ||
+          input.oauthClientSecret ||
+          input.oauthRedirectUri ||
+          input.oauthClientFile ||
+          input.oauthRefreshToken ||
+          input.oauthRefreshTokenFile,
+      );
+      if (!input.useEnv && !hasServiceAccount && !hasOauthInput) {
+        return "Google Chat requires service account JSON or OAuth credentials.";
+      }
+      if (hasOauthInput && !input.oauthFromGog) {
+        const hasClient =
+          Boolean(input.oauthClientFile) ||
+          (Boolean(input.oauthClientId) && Boolean(input.oauthClientSecret));
+        const hasRefresh = Boolean(input.oauthRefreshToken || input.oauthRefreshTokenFile);
+        if (!hasClient || !hasRefresh) {
+          return "Google Chat OAuth requires client id/secret (or --oauth-client-file) and a refresh token.";
+        }
       }
       return null;
     },
@@ -326,12 +360,30 @@ export const googlechatPlugin: ChannelPlugin<ResolvedGoogleChatAccount> = {
           : input.token
             ? { serviceAccount: input.token }
             : {};
+      const oauthClientId = input.oauthClientId?.trim();
+      const oauthClientSecret = input.oauthClientSecret?.trim();
+      const oauthRedirectUri = input.oauthRedirectUri?.trim();
+      const oauthClientFile = input.oauthClientFile?.trim();
+      const oauthRefreshToken = input.oauthRefreshToken?.trim();
+      const oauthRefreshTokenFile = input.oauthRefreshTokenFile?.trim();
+      const oauthFromGog = input.oauthFromGog === true ? true : undefined;
+      const gogAccount = input.gogAccount?.trim();
+      const gogClient = input.gogClient?.trim();
       const audienceType = input.audienceType?.trim();
       const audience = input.audience?.trim();
       const webhookPath = input.webhookPath?.trim();
       const webhookUrl = input.webhookUrl?.trim();
       const configPatch = {
         ...patch,
+        ...(oauthClientId ? { oauthClientId } : {}),
+        ...(oauthClientSecret ? { oauthClientSecret } : {}),
+        ...(oauthRedirectUri ? { oauthRedirectUri } : {}),
+        ...(oauthClientFile ? { oauthClientFile } : {}),
+        ...(oauthRefreshToken ? { oauthRefreshToken } : {}),
+        ...(oauthRefreshTokenFile ? { oauthRefreshTokenFile } : {}),
+        ...(oauthFromGog ? { oauthFromGog } : {}),
+        ...(gogAccount ? { gogAccount } : {}),
+        ...(gogClient ? { gogClient } : {}),
         ...(audienceType ? { audienceType } : {}),
         ...(audience ? { audience } : {}),
         ...(webhookPath ? { webhookPath } : {}),
@@ -491,6 +543,16 @@ export const googlechatPlugin: ChannelPlugin<ResolvedGoogleChatAccount> = {
         const configured = entry.configured === true;
         if (!enabled || !configured) return [];
         const issues = [];
+        if (entry.oauthFromGog && entry.userCredentialSource === "none") {
+          issues.push({
+            channel: "googlechat",
+            accountId,
+            kind: "auth",
+            message:
+              "Google Chat OAuth is set to reuse gog, but no gog OAuth credentials were detected.",
+            fix: "Ensure gog is installed and the keyring is unlocked (set GOG_KEYRING_PASSWORD), or set oauthRefreshToken/oauthClientFile manually.",
+          });
+        }
         if (!entry.audience) {
           issues.push({
             channel: "googlechat",
@@ -532,6 +594,8 @@ export const googlechatPlugin: ChannelPlugin<ResolvedGoogleChatAccount> = {
       enabled: account.enabled,
       configured: account.credentialSource !== "none",
       credentialSource: account.credentialSource,
+      oauthFromGog: account.config.oauthFromGog ?? false,
+      userCredentialSource: account.userCredentialSource,
       audienceType: account.config.audienceType,
       audience: account.config.audience,
       webhookPath: account.config.webhookPath,
diff --git a/extensions/googlechat/src/file-utils.ts b/extensions/googlechat/src/file-utils.ts
new file mode 100644
index 000000000..1c0c898b5
--- /dev/null
+++ b/extensions/googlechat/src/file-utils.ts
@@ -0,0 +1,48 @@
+import fs from "node:fs";
+
+/**
+ * Reads and parses a JSON file. Returns null if the file doesn't exist,
+ * is empty, or cannot be parsed. Logs meaningful errors for debugging.
+ */
+export function readJsonFile(filePath: string): unknown | null {
+  try {
+    const raw = fs.readFileSync(filePath, "utf8");
+    if (!raw.trim()) return null;
+    return JSON.parse(raw);
+  } catch (err) {
+    // Log meaningful errors (permission issues, malformed JSON) for debugging
+    if (err instanceof Error && err.message && !err.message.includes("ENOENT")) {
+      console.error(`Failed to read or parse JSON file ${filePath}`);
+    }
+    return null;
+  }
+}
+
+/**
+ * Extracts a refresh token from a JSON object that may have either
+ * `refresh_token` or `refreshToken` property.
+ */
+export function extractRefreshTokenFromRecord(record: Record<string, unknown>): string | null {
+  const token =
+    typeof record.refresh_token === "string"
+      ? record.refresh_token.trim()
+      : typeof record.refreshToken === "string"
+        ? record.refreshToken.trim()
+        : undefined;
+  if (token && token.length > 0) return token;
+  return null;
+}
+
+/**
+ * Reads a refresh token from a file. The file may contain either:
+ * - A plain string token
+ * - A JSON object with refresh_token or refreshToken property
+ */
+export function readRefreshTokenFromFile(filePath: string): string | null {
+  const raw = readJsonFile(filePath);
+  if (typeof raw === "string" && raw.trim()) return raw.trim();
+  if (raw && typeof raw === "object") {
+    return extractRefreshTokenFromRecord(raw as Record<string, unknown>);
+  }
+  return null;
+}
diff --git a/extensions/googlechat/src/gog.ts b/extensions/googlechat/src/gog.ts
new file mode 100644
index 000000000..b7add3b75
--- /dev/null
+++ b/extensions/googlechat/src/gog.ts
@@ -0,0 +1,218 @@
+import { execFileSync } from "node:child_process";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+import { readJsonFile } from "./file-utils.js";
+
+const tokenCache = new Map<string, string>();
+
+function resolveWildcardJsonFile(
+  dirs: string[],
+  baseName: string,
+  suffix = ".json",
+): string | null {
+  const matches: string[] = [];
+  for (const dir of dirs) {
+    try {
+      for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+        if (!entry.isFile()) continue;
+        if (
+          !entry.name.startsWith(`${baseName}-`) ||
+          !entry.name.endsWith(suffix)
+        )
+          continue;
+        matches.push(path.join(dir, entry.name));
+      }
+    } catch {
+      // Ignore missing/permission issues and fall back to other dirs.
+    }
+  }
+  if (matches.length === 1) return matches[0];
+  return null;
+}
+
+function resolveGogJsonFile(
+  params: { gogClient?: string | null; gogAccount?: string | null },
+  baseName: string,
+): string | null {
+  const client = params.gogClient?.trim();
+  const account = params.gogAccount?.trim();
+  const domain = extractDomain(account);
+  const dirs = resolveConfigDirs();
+  const candidates: string[] = [];
+
+  if (client) {
+    for (const dir of dirs) {
+      candidates.push(path.join(dir, `${baseName}-${client}.json`));
+    }
+  }
+  if (domain) {
+    for (const dir of dirs) {
+      candidates.push(path.join(dir, `${baseName}-${domain}.json`));
+    }
+  }
+  for (const dir of dirs) {
+    candidates.push(path.join(dir, `${baseName}.json`));
+  }
+
+  for (const candidate of candidates) {
+    if (fs.existsSync(candidate)) return candidate;
+  }
+
+  return resolveWildcardJsonFile(dirs, baseName);
+}
+
+function resolveConfigDirs(): string[] {
+  const dirs: string[] = [];
+  const xdg = process.env.XDG_CONFIG_HOME;
+  if (xdg) dirs.push(path.join(xdg, "gogcli"));
+  const home = os.homedir();
+  if (home) dirs.push(path.join(home, ".config", "gogcli"));
+  if (process.platform === "darwin" && home) {
+    dirs.push(path.join(home, "Library", "Application Support", "gogcli"));
+  }
+  if (process.platform === "win32") {
+    const appData = process.env.APPDATA;
+    if (appData) dirs.push(path.join(appData, "gogcli"));
+  }
+  return Array.from(new Set(dirs));
+}
+
+function extractDomain(account?: string | null): string | null {
+  const value = account?.trim();
+  if (!value) return null;
+  const at = value.lastIndexOf("@");
+  if (at === -1) return null;
+  return value.slice(at + 1).toLowerCase();
+}
+
+export function resolveGogCredentialsFile(params: {
+  gogClient?: string | null;
+  gogAccount?: string | null;
+}): string | null {
+  return resolveGogJsonFile(params, "credentials");
+}
+
+function extractRefreshToken(value: unknown): string | null {
+  if (!value || typeof value !== "object") return null;
+  const record = value as Record<string, unknown>;
+  const refreshToken =
+    typeof record.refresh_token === "string"
+      ? record.refresh_token
+      : typeof record.refreshToken === "string"
+        ? record.refreshToken
+        : undefined;
+  const trimmed = refreshToken?.trim();
+  if (!trimmed) return null;
+  if (trimmed.startsWith("ya29.")) return null;
+  if (trimmed.startsWith("1//")) return trimmed;
+  return trimmed.length > 30 ? trimmed : null;
+}
+
+function parseTokenEmails(value: unknown): string[] {
+  if (!value || typeof value !== "object") return [];
+  const record = value as Record<string, unknown>;
+  const keys = Array.isArray(record.keys)
+    ? record.keys.filter((entry): entry is string => typeof entry === "string")
+    : [];
+  const emails = new Set<string>();
+  for (const key of keys) {
+    const email = parseTokenEmail(key);
+    if (email) emails.add(email);
+  }
+  return Array.from(emails);
+}
+
+function parseTokenEmail(key: string): string | null {
+  const trimmed = key.trim();
+  if (!trimmed) return null;
+  const parts = trimmed.split(":");
+  if (parts.length < 2) return null;
+  if (parts[0] !== "token") return null;
+  if (parts.length === 2) return parts[1] || null;
+  return parts[2] || null;
+}
+
+export function readGogRefreshTokenSync(params: {
+  gogAccount?: string | null;
+  gogClient?: string | null;
+}): string | null {
+  const cacheKey = `${params.gogClient ?? ""}:${params.gogAccount ?? ""}`;
+  const cached = tokenCache.get(cacheKey);
+  if (cached) return cached;
+
+  const env = {
+    ...process.env,
+    ...(params.gogAccount?.trim()
+      ? { GOG_ACCOUNT: params.gogAccount.trim() }
+      : {}),
+    ...(params.gogClient?.trim()
+      ? { GOG_CLIENT: params.gogClient.trim() }
+      : {}),
+  };
+
+  const runGogJson = (args: string[]): unknown | null => {
+    try {
+      const stdout = execFileSync("gog", ["--no-input", "--json", ...args], {
+        encoding: "utf8",
+        stdio: ["ignore", "pipe", "pipe"],
+        timeout: 3000,
+        env,
+      });
+      return JSON.parse(stdout);
+    } catch {
+      return null;
+    }
+  };
+
+  const explicitAccount = params.gogAccount?.trim();
+  let account = explicitAccount;
+  if (!account) {
+    const parsed = runGogJson(["auth", "tokens", "list"]);
+    const emails = parseTokenEmails(parsed);
+    if (emails.length === 1) {
+      account = emails[0];
+    } else {
+      return null;
+    }
+  }
+
+  const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "clawdbot-gog-"));
+  const outPath = path.join(tmpDir, "token.json");
+  try {
+    execFileSync(
+      "gog",
+      [
+        "--no-input",
+        "--json",
+        "auth",
+        "tokens",
+        "export",
+        account,
+        "--out",
+        outPath,
+        "--overwrite",
+      ],
+      {
+        encoding: "utf8",
+        stdio: ["ignore", "pipe", "pipe"],
+        timeout: 5000,
+        env,
+      },
+    );
+    const parsed = readJsonFile(outPath);
+    const token = extractRefreshToken(parsed);
+    if (!token) return null;
+    tokenCache.set(cacheKey, token);
+    return token;
+  } catch {
+    return null;
+  } finally {
+    try {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    } catch {
+      // ignore cleanup errors
+    }
+  }
+}
diff --git a/extensions/googlechat/src/monitor.ts b/extensions/googlechat/src/monitor.ts
index d8ada7566..7d6058309 100644
--- a/extensions/googlechat/src/monitor.ts
+++ b/extensions/googlechat/src/monitor.ts
@@ -7,8 +7,10 @@ import {
   type ResolvedGoogleChatAccount
 } from "./accounts.js";
 import {
+  createGoogleChatReaction,
   downloadGoogleChatMedia,
   deleteGoogleChatMessage,
+  deleteGoogleChatReaction,
   sendGoogleChatMessage,
   updateGoogleChatMessage,
 } from "./api.js";
@@ -642,18 +644,18 @@ async function processMessageWithPipeline(params: {
     });
 
   // Typing indicator setup
-  // Note: Reaction mode requires user OAuth, not available with service account auth.
-  // If reaction is configured, we fall back to message mode with a warning.
+  // Note: Reaction mode requires user OAuth. If unavailable, fall back to message mode.
   let typingIndicator = account.config.typingIndicator ?? "message";
-  if (typingIndicator === "reaction") {
+  if (typingIndicator === "reaction" && account.userCredentialSource === "none") {
     runtime.error?.(
-      `[${account.accountId}] typingIndicator="reaction" requires user OAuth (not supported with service account). Falling back to "message" mode.`,
+      `[${account.accountId}] typingIndicator="reaction" requires user OAuth. Configure OAuth (or oauthFromGog) to enable reactions; falling back to "message" mode.`,
     );
     typingIndicator = "message";
   }
   let typingMessageName: string | undefined;
+  let typingReactionName: string | undefined;
 
-  // Start typing indicator (message mode only, reaction mode not supported with app auth)
+  // Start typing indicator (message mode uses a temporary message; reaction mode uses 👀)
   if (typingIndicator === "message") {
     try {
       const botName = resolveBotDisplayName({
@@ -673,6 +675,21 @@ async function processMessageWithPipeline(params: {
     }
   }
 
+  if (typingIndicator === "reaction" && account.userCredentialSource !== "none") {
+    if (message.name) {
+      try {
+        const reaction = await createGoogleChatReaction({
+          account,
+          messageName: message.name,
+          emoji: "👀",
+        });
+        typingReactionName = reaction?.name;
+      } catch (err) {
+        runtime.error?.(`Failed sending typing reaction: ${String(err)}`);
+      }
+    }
+  }
+
   await core.channel.reply.dispatchReplyWithBufferedBlockDispatcher({
     ctx: ctxPayload,
     cfg: config,
@@ -687,9 +704,11 @@ async function processMessageWithPipeline(params: {
           config,
           statusSink,
           typingMessageName,
+          typingReactionName,
         });
         // Only use typing message for first delivery
         typingMessageName = undefined;
+        typingReactionName = undefined;
       },
       onError: (err, info) => {
         runtime.error?.(
@@ -729,14 +748,36 @@ async function deliverGoogleChatReply(params: {
   config: OpenClawConfig;
   statusSink?: (patch: { lastInboundAt?: number; lastOutboundAt?: number }) => void;
   typingMessageName?: string;
+  typingReactionName?: string;
 }): Promise<void> {
-  const { payload, account, spaceId, runtime, core, config, statusSink, typingMessageName } = params;
+  const {
+    payload,
+    account,
+    spaceId,
+    runtime,
+    core,
+    config,
+    statusSink,
+    typingMessageName,
+    typingReactionName,
+  } = params;
   const mediaList = payload.mediaUrls?.length
     ? payload.mediaUrls
     : payload.mediaUrl
       ? [payload.mediaUrl]
       : [];
 
+  if (typingReactionName) {
+    try {
+      await deleteGoogleChatReaction({
+        account,
+        reactionName: typingReactionName,
+      });
+    } catch (err) {
+      runtime.error?.(`Google Chat typing reaction cleanup failed: ${String(err)}`);
+    }
+  }
+
   if (mediaList.length > 0) {
     let suppressCaption = false;
     if (typingMessageName) {
diff --git a/extensions/googlechat/src/onboarding.ts b/extensions/googlechat/src/onboarding.ts
index f25a64595..b05a732ae 100644
--- a/extensions/googlechat/src/onboarding.ts
+++ b/extensions/googlechat/src/onboarding.ts
@@ -21,6 +21,11 @@ const channel = "googlechat" as const;
 
 const ENV_SERVICE_ACCOUNT = "GOOGLE_CHAT_SERVICE_ACCOUNT";
 const ENV_SERVICE_ACCOUNT_FILE = "GOOGLE_CHAT_SERVICE_ACCOUNT_FILE";
+const ENV_OAUTH_CLIENT_ID = "GOOGLE_CHAT_OAUTH_CLIENT_ID";
+const ENV_OAUTH_CLIENT_SECRET = "GOOGLE_CHAT_OAUTH_CLIENT_SECRET";
+const ENV_OAUTH_CLIENT_FILE = "GOOGLE_CHAT_OAUTH_CLIENT_FILE";
+const ENV_OAUTH_REFRESH_TOKEN = "GOOGLE_CHAT_OAUTH_REFRESH_TOKEN";
+const ENV_OAUTH_REFRESH_TOKEN_FILE = "GOOGLE_CHAT_OAUTH_REFRESH_TOKEN_FILE";
 
 function setGoogleChatDmPolicy(cfg: OpenClawConfig, policy: DmPolicy) {
   const allowFrom =
@@ -138,10 +143,15 @@ async function promptCredentials(params: {
   const envReady =
     accountId === DEFAULT_ACCOUNT_ID &&
     (Boolean(process.env[ENV_SERVICE_ACCOUNT]) ||
-      Boolean(process.env[ENV_SERVICE_ACCOUNT_FILE]));
+      Boolean(process.env[ENV_SERVICE_ACCOUNT_FILE]) ||
+      Boolean(process.env[ENV_OAUTH_CLIENT_ID]) ||
+      Boolean(process.env[ENV_OAUTH_CLIENT_SECRET]) ||
+      Boolean(process.env[ENV_OAUTH_CLIENT_FILE]) ||
+      Boolean(process.env[ENV_OAUTH_REFRESH_TOKEN]) ||
+      Boolean(process.env[ENV_OAUTH_REFRESH_TOKEN_FILE]));
   if (envReady) {
     const useEnv = await prompter.confirm({
-      message: "Use GOOGLE_CHAT_SERVICE_ACCOUNT env vars?",
+      message: "Use Google Chat env credentials?",
       initialValue: true,
     });
     if (useEnv) {
@@ -183,6 +193,101 @@ async function promptCredentials(params: {
   });
 }
 
+async function promptOAuthCredentials(params: {
+  cfg: ClawdbotConfig;
+  prompter: WizardPrompter;
+  accountId: string;
+}): Promise<ClawdbotConfig> {
+  const { cfg, prompter, accountId } = params;
+  const envReady =
+    accountId === DEFAULT_ACCOUNT_ID &&
+    (Boolean(process.env[ENV_OAUTH_CLIENT_ID]) ||
+      Boolean(process.env[ENV_OAUTH_CLIENT_SECRET]) ||
+      Boolean(process.env[ENV_OAUTH_CLIENT_FILE]) ||
+      Boolean(process.env[ENV_OAUTH_REFRESH_TOKEN]) ||
+      Boolean(process.env[ENV_OAUTH_REFRESH_TOKEN_FILE]));
+  if (envReady) {
+    const useEnv = await prompter.confirm({
+      message: "Use Google Chat OAuth env credentials?",
+      initialValue: true,
+    });
+    if (useEnv) {
+      return applyAccountConfig({ cfg, accountId, patch: {} });
+    }
+  }
+  const method = await prompter.select({
+    message: "OAuth client source",
+    options: [
+      { value: "gog", label: "Reuse gog OAuth (recommended if already set up)" },
+      { value: "file", label: "OAuth client JSON file" },
+      { value: "manual", label: "OAuth client id + secret" },
+    ],
+    initialValue: "gog",
+  });
+
+  let patch: Record<string, unknown> = {};
+  if (method === "gog") {
+    const gogAccount = await prompter.text({
+      message: "gog account email (optional)",
+      placeholder: "you@example.com",
+    });
+    const gogClient = await prompter.text({
+      message: "gog client name (optional)",
+      placeholder: "work",
+    });
+    patch = {
+      oauthFromGog: true,
+      ...(String(gogAccount ?? "").trim() ? { gogAccount: String(gogAccount).trim() } : {}),
+      ...(String(gogClient ?? "").trim() ? { gogClient: String(gogClient).trim() } : {}),
+    };
+  } else if (method === "file") {
+    const path = await prompter.text({
+      message: "OAuth client JSON path",
+      placeholder: "/path/to/oauth-client.json",
+      validate: (value) => (String(value ?? "").trim() ? undefined : "Required"),
+    });
+    patch = { oauthClientFile: String(path).trim() };
+  } else {
+    const clientId = await prompter.text({
+      message: "OAuth client id",
+      placeholder: "123456.apps.googleusercontent.com",
+      validate: (value) => (String(value ?? "").trim() ? undefined : "Required"),
+    });
+    const clientSecret = await prompter.text({
+      message: "OAuth client secret",
+      placeholder: "GOCSPX-...",
+      validate: (value) => (String(value ?? "").trim() ? undefined : "Required"),
+    });
+    const redirectUri = await prompter.text({
+      message: "OAuth redirect URI (optional)",
+      placeholder: "https://your.host/googlechat/oauth/callback",
+    });
+    patch = {
+      oauthClientId: String(clientId).trim(),
+      oauthClientSecret: String(clientSecret).trim(),
+      ...(String(redirectUri ?? "").trim() ? { oauthRedirectUri: String(redirectUri).trim() } : {}),
+    };
+  }
+
+  const refreshToken =
+    method === "gog"
+      ? undefined
+      : await prompter.text({
+          message: "OAuth refresh token",
+          placeholder: "1//0g...",
+          validate: (value) => (String(value ?? "").trim() ? undefined : "Required"),
+        });
+
+  return applyAccountConfig({
+    cfg,
+    accountId,
+    patch: {
+      ...patch,
+      ...(refreshToken ? { oauthRefreshToken: String(refreshToken).trim() } : {}),
+    },
+  });
+}
+
 async function promptAudience(params: {
   cfg: OpenClawConfig;
   prompter: WizardPrompter;
@@ -218,8 +323,10 @@ async function promptAudience(params: {
 async function noteGoogleChatSetup(prompter: WizardPrompter) {
   await prompter.note(
     [
-      "Google Chat apps use service-account auth and an HTTPS webhook.",
+      "Google Chat apps use service-account auth or user OAuth plus an HTTPS webhook.",
       "Set the Chat API scopes in your service account and configure the Chat app URL.",
+      "User OAuth enables reactions and other user-level APIs.",
+      "If gog is configured, you can reuse its OAuth credentials for Chat.",
       "Webhook verification requires audience type + audience value.",
       `Docs: ${formatDocsLink("/channels/googlechat", "channels/googlechat")}`,
     ].join("\n"),
@@ -238,7 +345,7 @@ export const googlechatOnboardingAdapter: ChannelOnboardingAdapter = {
       channel,
       configured,
       statusLines: [
-        `Google Chat: ${configured ? "configured" : "needs service account"}`,
+        `Google Chat: ${configured ? "configured" : "needs auth"}`,
       ],
       selectionHint: configured ? "configured" : "needs auth",
     };
@@ -265,7 +372,19 @@ export const googlechatOnboardingAdapter: ChannelOnboardingAdapter = {
 
     let next = cfg;
     await noteGoogleChatSetup(prompter);
-    next = await promptCredentials({ cfg: next, prompter, accountId });
+    const authMethod = await prompter.select({
+      message: "Configure Google Chat credentials",
+      options: [
+        { value: "service-account", label: "Service account (bot auth)" },
+        { value: "oauth", label: "User OAuth (reactions + user actions)" },
+      ],
+      initialValue: "service-account",
+    });
+    if (authMethod === "oauth") {
+      next = await promptOAuthCredentials({ cfg: next, prompter, accountId });
+    } else {
+      next = await promptCredentials({ cfg: next, prompter, accountId });
+    }
     next = await promptAudience({ cfg: next, prompter, accountId });
 
     const namedConfig = migrateBaseNameToDefaultAccount({
diff --git a/src/channels/plugins/types.core.ts b/src/channels/plugins/types.core.ts
index d640b389f..90462fd82 100644
--- a/src/channels/plugins/types.core.ts
+++ b/src/channels/plugins/types.core.ts
@@ -35,6 +35,15 @@ export type ChannelSetupInput = {
   webhookUrl?: string;
   audienceType?: string;
   audience?: string;
+  oauthClientId?: string;
+  oauthClientSecret?: string;
+  oauthRedirectUri?: string;
+  oauthClientFile?: string;
+  oauthRefreshToken?: string;
+  oauthRefreshTokenFile?: string;
+  oauthFromGog?: boolean;
+  gogAccount?: string;
+  gogClient?: string;
   useEnv?: boolean;
   homeserver?: string;
   userId?: string;
diff --git a/src/cli/channels-cli.ts b/src/cli/channels-cli.ts
index dd60016d4..035c9690e 100644
--- a/src/cli/channels-cli.ts
+++ b/src/cli/channels-cli.ts
@@ -38,6 +38,15 @@ const optionNamesAdd = [
   "webhookUrl",
   "audienceType",
   "audience",
+  "oauthClientId",
+  "oauthClientSecret",
+  "oauthRedirectUri",
+  "oauthClientFile",
+  "oauthRefreshToken",
+  "oauthRefreshTokenFile",
+  "oauthFromGog",
+  "gogAccount",
+  "gogClient",
   "useEnv",
   "homeserver",
   "userId",
@@ -175,6 +184,15 @@ export function registerChannelsCli(program: Command) {
     .option("--webhook-url <url>", "Google Chat webhook URL")
     .option("--audience-type <type>", "Google Chat audience type (app-url|project-number)")
     .option("--audience <value>", "Google Chat audience value (app URL or project number)")
+    .option("--oauth-client-id <id>", "Google Chat OAuth client ID")
+    .option("--oauth-client-secret <secret>", "Google Chat OAuth client secret")
+    .option("--oauth-redirect-uri <uri>", "Google Chat OAuth redirect URI")
+    .option("--oauth-client-file <path>", "Google Chat OAuth client JSON file")
+    .option("--oauth-refresh-token <token>", "Google Chat OAuth refresh token")
+    .option("--oauth-refresh-token-file <path>", "Google Chat OAuth refresh token file")
+    .option("--oauth-from-gog", "Reuse gog OAuth credentials for Google Chat", false)
+    .option("--gog-account <email>", "gog account email to match refresh token")
+    .option("--gog-client <client>", "gog client name to match credentials file")
     .option("--homeserver <url>", "Matrix homeserver URL")
     .option("--user-id <id>", "Matrix user ID")
     .option("--access-token <token>", "Matrix access token")
diff --git a/src/commands/channels/add-mutators.ts b/src/commands/channels/add-mutators.ts
index f6d9d3a56..fc5d8778c 100644
--- a/src/commands/channels/add-mutators.ts
+++ b/src/commands/channels/add-mutators.ts
@@ -39,6 +39,15 @@ export function applyChannelAccountConfig(params: {
   webhookUrl?: string;
   audienceType?: string;
   audience?: string;
+  oauthClientId?: string;
+  oauthClientSecret?: string;
+  oauthRedirectUri?: string;
+  oauthClientFile?: string;
+  oauthRefreshToken?: string;
+  oauthRefreshTokenFile?: string;
+  oauthFromGog?: boolean;
+  gogAccount?: string;
+  gogClient?: string;
   useEnv?: boolean;
   homeserver?: string;
   userId?: string;
@@ -76,6 +85,15 @@ export function applyChannelAccountConfig(params: {
     webhookUrl: params.webhookUrl,
     audienceType: params.audienceType,
     audience: params.audience,
+    oauthClientId: params.oauthClientId,
+    oauthClientSecret: params.oauthClientSecret,
+    oauthRedirectUri: params.oauthRedirectUri,
+    oauthClientFile: params.oauthClientFile,
+    oauthRefreshToken: params.oauthRefreshToken,
+    oauthRefreshTokenFile: params.oauthRefreshTokenFile,
+    oauthFromGog: params.oauthFromGog,
+    gogAccount: params.gogAccount,
+    gogClient: params.gogClient,
     useEnv: params.useEnv,
     homeserver: params.homeserver,
     userId: params.userId,
diff --git a/src/commands/channels/add.ts b/src/commands/channels/add.ts
index 274df1775..bc1dc8d61 100644
--- a/src/commands/channels/add.ts
+++ b/src/commands/channels/add.ts
@@ -36,6 +36,15 @@ export type ChannelsAddOptions = {
   webhookUrl?: string;
   audienceType?: string;
   audience?: string;
+  oauthClientId?: string;
+  oauthClientSecret?: string;
+  oauthRedirectUri?: string;
+  oauthClientFile?: string;
+  oauthRefreshToken?: string;
+  oauthRefreshTokenFile?: string;
+  oauthFromGog?: boolean;
+  gogAccount?: string;
+  gogClient?: string;
   useEnv?: boolean;
   homeserver?: string;
   userId?: string;
@@ -204,6 +213,15 @@ export async function channelsAddCommand(
       webhookUrl: opts.webhookUrl,
       audienceType: opts.audienceType,
       audience: opts.audience,
+      oauthClientId: opts.oauthClientId,
+      oauthClientSecret: opts.oauthClientSecret,
+      oauthRedirectUri: opts.oauthRedirectUri,
+      oauthClientFile: opts.oauthClientFile,
+      oauthRefreshToken: opts.oauthRefreshToken,
+      oauthRefreshTokenFile: opts.oauthRefreshTokenFile,
+      oauthFromGog: opts.oauthFromGog,
+      gogAccount: opts.gogAccount,
+      gogClient: opts.gogClient,
       homeserver: opts.homeserver,
       userId: opts.userId,
       accessToken: opts.accessToken,
@@ -247,6 +265,15 @@ export async function channelsAddCommand(
     webhookUrl: opts.webhookUrl,
     audienceType: opts.audienceType,
     audience: opts.audience,
+    oauthClientId: opts.oauthClientId,
+    oauthClientSecret: opts.oauthClientSecret,
+    oauthRedirectUri: opts.oauthRedirectUri,
+    oauthClientFile: opts.oauthClientFile,
+    oauthRefreshToken: opts.oauthRefreshToken,
+    oauthRefreshTokenFile: opts.oauthRefreshTokenFile,
+    oauthFromGog: opts.oauthFromGog,
+    gogAccount: opts.gogAccount,
+    gogClient: opts.gogClient,
     homeserver: opts.homeserver,
     userId: opts.userId,
     accessToken: opts.accessToken,
diff --git a/src/config/types.googlechat.ts b/src/config/types.googlechat.ts
index 5fceff49e..169e70fe9 100644
--- a/src/config/types.googlechat.ts
+++ b/src/config/types.googlechat.ts
@@ -60,6 +60,24 @@ export type GoogleChatAccountConfig = {
   serviceAccount?: string | Record<string, unknown>;
   /** Service account JSON file path. */
   serviceAccountFile?: string;
+  /** OAuth client id (user auth). */
+  oauthClientId?: string;
+  /** OAuth client secret (user auth). */
+  oauthClientSecret?: string;
+  /** OAuth redirect URI (user auth). */
+  oauthRedirectUri?: string;
+  /** OAuth client JSON file path (user auth). */
+  oauthClientFile?: string;
+  /** OAuth refresh token (user auth). */
+  oauthRefreshToken?: string;
+  /** OAuth refresh token file path (user auth). */
+  oauthRefreshTokenFile?: string;
+  /** Reuse gog OAuth credentials (user auth). */
+  oauthFromGog?: boolean;
+  /** gog account email to match refresh token (optional). */
+  gogAccount?: string;
+  /** gog client name to match credentials file (optional). */
+  gogClient?: string;
   /** Webhook audience type (app-url or project-number). */
   audienceType?: "app-url" | "project-number";
   /** Audience value (app URL or project number). */
diff --git a/src/config/zod-schema.providers-core.ts b/src/config/zod-schema.providers-core.ts
index ed7dda22a..850847d42 100644
--- a/src/config/zod-schema.providers-core.ts
+++ b/src/config/zod-schema.providers-core.ts
@@ -323,6 +323,15 @@ export const GoogleChatAccountSchema = z
     groups: z.record(z.string(), GoogleChatGroupSchema.optional()).optional(),
     serviceAccount: z.union([z.string(), z.record(z.string(), z.unknown())]).optional(),
     serviceAccountFile: z.string().optional(),
+    oauthClientId: z.string().optional(),
+    oauthClientSecret: z.string().optional(),
+    oauthRedirectUri: z.string().optional(),
+    oauthClientFile: z.string().optional(),
+    oauthRefreshToken: z.string().optional(),
+    oauthRefreshTokenFile: z.string().optional(),
+    oauthFromGog: z.boolean().optional(),
+    gogAccount: z.string().optional(),
+    gogClient: z.string().optional(),
     audienceType: z.enum(["app-url", "project-number"]).optional(),
     audience: z.string().optional(),
     webhookPath: z.string().optional(),