ThinkSpace

thinkspace-mcp

An MCP server that sends notes from your AI conversations to the ThinkSpace inbox — so what you reach with AI doesn't scroll away in a chat log, and ends up as cards you arrange with your own hands.

ThinkSpace's philosophy: AI helps gather and diverge; you build the map, because only what you build yourself stays in your head. Accordingly, this server never creates cards directly — it only delivers material to the inbox. Turning material into cards is yours.

• Remote server (recommended): https://mcp.thinkspace-app.com/mcp — works from claude.ai, ChatGPT, Claude Code, and any MCP client that supports OAuth. Notes arrive on every device where you're signed in to ThinkSpace.
• Local server (legacy): a stdio bridge for Claude Code on the same Mac as the app.

Remote server

Connect

Client	How
claude.ai (web / desktop / mobile)	Settings → Connectors → Add custom connector → URL https://mcp.thinkspace-app.com/mcp
ChatGPT	Settings → Connectors (developer mode) → Create → MCP server URL https://mcp.thinkspace-app.com/mcp, auth OAuth
Claude Code	claude mcp add --transport http thinkspace https://mcp.thinkspace-app.com/mcp then /mcp to sign in

The client opens ThinkSpace's connection page. Sign in with your ThinkSpace email and password, or — if you use Sign in with Apple — with a 6-digit code from the app: Inbox → link icon (top right) → “Get a connection code” (valid for 10 minutes).

You can see and revoke connections in the same screen in the app. A revoked connection gets a 401 on its next call and the client asks you to connect again.

Use

「いまの結論、受信箱に送って」 "Send this to my ThinkSpace inbox."

The client calls send_to_inbox with the full text of the message and a rough label. Open the inbox in ThinkSpace (iPhone / iPad / Mac) and decide what becomes a card.

Tool

send_to_inbox

input	description
text (required)	Note body — the verbatim full text of one chat message
title (optional)	Label draft, ideally ≤20 characters (you'll rewrite it by hand)
source (optional)	Origin identifier, defaults to mcp

Annotations: readOnlyHint: false, destructiveHint: false, idempotentHint: false. The server only writes to the inbox; it cannot read your inbox or canvases.

Limits: 60 notes per minute per user; bodies over 30,000 characters are cut at that point and flagged as truncated.

How it works

• One Cloudflare Worker serves both the OAuth 2.1 authorization server and the MCP endpoint (Streamable HTTP, stateless). Discovery via RFC 9728 / RFC 8414, dynamic client registration (RFC 7591) and client ID metadata documents, PKCE S256, refresh-token rotation.
• The authorization page is ThinkSpace's own. Passwords are verified against ThinkSpace's auth service and never stored or logged. App codes are one-time and expire in 10 minutes.
• Each connection is recorded and can be revoked from the app. Tokens carry only the user id and connection id.
• Notes are written to the ThinkSpace backend (Supabase) as inbox items and delivered to the app by its normal sync.

Docs for end users: https://support.thinkspace.nextbuild.jp/en/ai-inbox/ Privacy policy: https://thinkspace-public.s3.ap-northeast-1.amazonaws.com/privacy-policy-en-v2.html

Develop

cd remote
npm install
cp .dev.vars.example .dev.vars   # SUPABASE_URL / SUPABASE_ANON_KEY / SUPABASE_SERVICE_ROLE_KEY
npx wrangler dev                 # http://localhost:8787/mcp
./node_modules/.bin/tsc --noEmit
npx wrangler deploy

Secrets in production are set with wrangler secret put (see remote/wrangler.jsonc). The service role key lives only in Worker secrets and .dev.vars (gitignored).

Local server (legacy, macOS only)

A stdio server that hands notes to the ThinkSpace app on the same Mac via the thinkspace:// URL scheme; the app's own sync then delivers them to your iPad / iPhone. No account or token is needed, but it only works with Claude Code on that Mac.

claude mcp add thinkspace -- npx -y thinkspace-mcp
# or from a local checkout
git clone https://github.com/naoyax628X/thinkspace-mcp.git
cd thinkspace-mcp && npm install
claude mcp add thinkspace -- node /path/to/thinkspace-mcp/index.js

The npm package is thinkspace-mcp, published by the same author as this repository; it contains only index.js (the local bridge).

Requires Node.js 18+ and the ThinkSpace Mac app. The tool is the same send_to_inbox; source defaults to claude-code, and bodies beyond URL-scheme limits are delivered via the clipboard channel (source becomes clipboard). Note that the clipboard channel overwrites whatever is on your clipboard at that moment.

License

MIT