The Background AI Chat MCP Server lets you control persistent AI chat sessions on chat.sakana.ai via headless Chrome, exposing them as MCP tools for AI assistants like Claude.
Open chat sessions (session_open): Launch a persistent chat session backed by a headless Chrome browser. Requires a one-time Terms of Service acceptance on first use.
Send messages (chat_send): Send a message to an active session and receive a streamed reply; incremental tokens are emitted as MCP logging notifications, with options to enable web search or "thinking" mode.
Interrupt responses (chat_interrupt): Abort an in-flight message mid-stream, returning any partial text already received.
Close sessions (session_close): Shut down a session and release its browser context, with an option to retain history (cookies and state) for future reuse.
List sessions (session_list): View all active and idle sessions to manage concurrent usage (up to 5 by default).
Each session runs in an isolated browser context with separate cookies. The server is configurable via environment variables (transport mechanism, auth key, HTTP port, max sessions, data directory) and is intended for personal/internal use.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Background AI Chat MCP Server Open a new Sakana chat session"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
MCP server that drives chat.sakana.ai via headless Chrome — persistent sessions for AI assistant use.
npx background-ai-chatnpm install -g background-ai-chat
background-ai-chatgit clone https://github.com/misternay/mcp-sakana-chat.git
cd mcp-sakana-chat
npm install && npm run build && npm startRelated MCP server: Chrome MCP Server
Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or equivalent:
{
"mcpServers": {
"sakana-chat": {
"command": "npx",
"args": ["-y", "background-ai-chat"]
}
}
}Why -y flag: Skips npm's install confirmation prompt, required for non-interactive usage.
Alternative (if globally installed):
{
"mcpServers": {
"sakana-chat": {
"command": "background-ai-chat"
}
}
}Variable | Default | Description |
|
|
|
|
| Bearer token for HTTP/SSE |
|
| HTTP/SSE port |
|
| Run Chrome headless |
|
| Max concurrent sessions |
|
| Root data directory |
session_open — Open a persistent chat session. Input: { login?, headless?, tosAccepted? } → Output: { sessionId, conversationId, mode, rateLimit, tosSummary }
chat_send — Send a message with streaming token events. Input: { sessionId, message } → Output: { reply, tokens[] }
chat_interrupt — Abort an in-flight message. Input: { sessionId } → Output: { interrupted: true }
session_close — Close a session and release its browser. Input: { sessionId, keepHistory? } → Output: { closed, messagesExchanged }
session_list — List all known sessions. Input: {} → Output: { sessions[] }
First call requires tosAccepted: true. Subsequent calls reuse the machine-wide ack.
ToS gate — machine-wide acknowledgment of Sakana Terms 5.8/5.9
Cookie isolation — separate browser context per session
No message logging — only metadata (sessionId, event, ms) to stderr
Personal/internal use only — not a competing product
npm run build # compile TypeScript
npm test # run tests
npm run test:watch # watch modeUnclaimed servers have limited discoverability.
If you are the server author, to access and configure the admin panel.
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