How do I install Calendar Bridge?

Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Calendar Bridge need an API key?

No required environment variable is listed on this record.

What transport does Calendar Bridge use?

Calendar Bridge is reached over HTTP.

When was Calendar Bridge last checked?

Last checked 2026-10-16. Connects ChatGPT to your Apple Calendar via a local Mac agent + Vercel relay

Calendar Bridge MCP server

📅 CalendarBridge

Your Apple Calendar, in ChatGPT — on your own Mac.

CalendarBridge is a Model Context Protocol (MCP) connector that lets ChatGPT work with your Apple Calendar. It never uploads your events to a third party — every action runs on your own Mac through a tiny local agent. The cloud piece is only a stateless relay that shuttles requests between ChatGPT and your Mac.

  ChatGPT  ──OAuth──►  CalendarBridge relay  ──job queue──►  calendar-agent  ──►  Calendar.app
 (connector)          (Vercel, stateless)      (your Mac, polls & executes)     (on your Mac)

Your Mac is the only place your events are ever read or written. The relay stores only short-lived job payloads and your account record; it never sees an event unless a job is in flight, and jobs expire in seconds.

For users — 3 steps

1. Create your account at calendarbridge.vercel.app and generate a pairing code.

2. Install the Mac agent (needs Node 18+):

npx calendar-agent pair <YOUR-CODE>   # link this Mac to your account
npx calendar-agent install            # keep it running on every restart

The first time it touches Calendar, macOS asks "Terminal wants to control Calendar" — click OK (one time).

3. Connect ChatGPT: Settings → Plugins → turn on Developer mode (Security & login) → Create a custom plugin → paste the MCP Server URL https://calendarbridge.vercel.app/mcp → Authentication OAuth → sign in & Allow.

That's it. In a new chat: "Search my Apple Calendar for the dentist appointment" or "Add a Team Standup to my Work calendar tomorrow at 9am."

Your Mac must be awake with the agent running. npx calendar-agent install makes it start automatically at login and restart if it ever crashes.

Managing the agent

npx calendar-agent status      # is it paired & reachable?
npx calendar-agent logs        # recent activity
npx calendar-agent uninstall   # stop auto-start

What ChatGPT can do

Tool	Action
`list_calendars`	List all your calendars (Work, Personal, Family, …)
`list_events`	List upcoming events in a date window (default next 7 days), optionally one calendar
`search_events`	Find events whose title contains a keyword
`get_event`	Read one event by id
`create_event`	Create an event (title, start, end, optional location, notes, calendar, all-day)
`update_event`	Edit an event's fields (overwrites the fields you pass — read it first)

Self-hosting

You can run your own relay so nothing depends on the hosted instance.

Prereqs: a Vercel account and a Supabase project (free tiers are fine).

Storage — in your Supabase project's SQL editor, run supabase/schema.sql. It creates a tiny Redis-shaped KV + queue surface (nb_* functions) with RLS on.
Deploy the server/ directory to Vercel.
Set env vars (see server/.env.example):
- SUPABASE_URL, SUPABASE_SERVICE_ROLE_KEY — your project + service-role key
- JWT_SECRET — openssl rand -hex 32
Verify: curl https://YOUR-APP.vercel.app/api/health → redisConfigured, redisOk, jwtSecretSet all true.
Point the agent at it: npx calendar-agent pair <CODE> --server https://YOUR-APP.vercel.app.

How it works

Auth — OAuth 2.1 with PKCE and Dynamic Client Registration (RFC 7591). ChatGPT registers itself, the user signs in on the CalendarBridge consent page, and ChatGPT gets a scoped MCP access token. JWTs are HMAC-signed; three kinds (session, agent, mcp) with distinct privileges. Optional email verification via Resend (RESEND_API_KEY); off unless configured, and enforcement is opt-in (REQUIRE_EMAIL_VERIFICATION).
Relay — MCP tool call → job pushed to jobs:<user> (TTL ≤ the caller's wait window, so an abandoned job can't run late) → the Mac agent (holding a hanging long-poll) is handed the job within ~200ms, executes it, pushes the result → the MCP handler returns it. The long-poll means jobs are delivered on arrival rather than on a fixed interval, so relay overhead is ~300ms instead of ~1s. The agent is considered "online" only while it's actively connected.
Agent — a dependency-free Node CLI. Tools run via JXA (osascript -l JavaScript) against Calendar.app; arguments are passed as JSON over argv (never shell-interpolated). A macOS LaunchAgent keeps it alive across logins and crashes.

Repository layout

server/    Vercel functions: OAuth + MCP endpoint + relay        (deploy this)
agent/     calendar-agent — the npm-published Mac CLI                 (users npx this)
kit/       Browser automations: register the dev-mode connector AND
           fill the OpenAI directory submission (see kit/README.md)
supabase/  schema.sql for self-hosting the storage
test/      end-to-end OAuth + MCP integration test

Development

# server
cd server && cp .env.example .env.local   # fill in, then: vercel dev
# end-to-end test against a live deployment (reads ../.env.local)
node test/e2e-oauth.mjs
# agent unit tests
node --test agent/test-agent-unit.mjs

Security & privacy

Events are read/written only on your Mac. The relay never persists event content — job payloads live in Redis-shaped storage with a short TTL and are deleted on delivery.
The agent token is stored at ~/.calendarbridge-agent.json (mode 600).
No secrets are committed; see .gitignore and the .env.example files.
Write tools are marked destructive so ChatGPT asks before changing an event.

License

MIT © Isaiah Dupree

📅 CalendarBridge

Your Apple Calendar, in ChatGPT — on your own Mac.

  ChatGPT  ──OAuth──►  CalendarBridge relay  ──job queue──►  calendar-agent  ──►  Calendar.app
 (connector)          (Vercel, stateless)      (your Mac, polls & executes)     (on your Mac)

For users — 3 steps

1. Create your account at calendarbridge.vercel.app and generate a pairing code.

2. Install the Mac agent (needs Node 18+):

npx calendar-agent pair <YOUR-CODE>   # link this Mac to your account
npx calendar-agent install            # keep it running on every restart

The first time it touches Calendar, macOS asks "Terminal wants to control Calendar" — click OK (one time).

That's it. In a new chat: "Search my Apple Calendar for the dentist appointment" or "Add a Team Standup to my Work calendar tomorrow at 9am."

Your Mac must be awake with the agent running. npx calendar-agent install makes it start automatically at login and restart if it ever crashes.

Managing the agent

npx calendar-agent status      # is it paired & reachable?
npx calendar-agent logs        # recent activity
npx calendar-agent uninstall   # stop auto-start

What ChatGPT can do

Tool	Action
`list_calendars`	List all your calendars (Work, Personal, Family, …)
`list_events`	List upcoming events in a date window (default next 7 days), optionally one calendar
`search_events`	Find events whose title contains a keyword
`get_event`	Read one event by id
`create_event`	Create an event (title, start, end, optional location, notes, calendar, all-day)
`update_event`	Edit an event's fields (overwrites the fields you pass — read it first)

Self-hosting

You can run your own relay so nothing depends on the hosted instance.

Prereqs: a Vercel account and a Supabase project (free tiers are fine).

Storage — in your Supabase project's SQL editor, run supabase/schema.sql. It creates a tiny Redis-shaped KV + queue surface (nb_* functions) with RLS on.
Deploy the server/ directory to Vercel.
Set env vars (see server/.env.example):
- SUPABASE_URL, SUPABASE_SERVICE_ROLE_KEY — your project + service-role key
- JWT_SECRET — openssl rand -hex 32
Verify: curl https://YOUR-APP.vercel.app/api/health → redisConfigured, redisOk, jwtSecretSet all true.
Point the agent at it: npx calendar-agent pair <CODE> --server https://YOUR-APP.vercel.app.

How it works

Auth — OAuth 2.1 with PKCE and Dynamic Client Registration (RFC 7591). ChatGPT registers itself, the user signs in on the CalendarBridge consent page, and ChatGPT gets a scoped MCP access token. JWTs are HMAC-signed; three kinds (session, agent, mcp) with distinct privileges. Optional email verification via Resend (RESEND_API_KEY); off unless configured, and enforcement is opt-in (REQUIRE_EMAIL_VERIFICATION).
Relay — MCP tool call → job pushed to jobs:<user> (TTL ≤ the caller's wait window, so an abandoned job can't run late) → the Mac agent (holding a hanging long-poll) is handed the job within ~200ms, executes it, pushes the result → the MCP handler returns it. The long-poll means jobs are delivered on arrival rather than on a fixed interval, so relay overhead is ~300ms instead of ~1s. The agent is considered "online" only while it's actively connected.
Agent — a dependency-free Node CLI. Tools run via JXA (osascript -l JavaScript) against Calendar.app; arguments are passed as JSON over argv (never shell-interpolated). A macOS LaunchAgent keeps it alive across logins and crashes.

Repository layout

server/    Vercel functions: OAuth + MCP endpoint + relay        (deploy this)
agent/     calendar-agent — the npm-published Mac CLI                 (users npx this)
kit/       Browser automations: register the dev-mode connector AND
           fill the OpenAI directory submission (see kit/README.md)
supabase/  schema.sql for self-hosting the storage
test/      end-to-end OAuth + MCP integration test

Development

# server
cd server && cp .env.example .env.local   # fill in, then: vercel dev
# end-to-end test against a live deployment (reads ../.env.local)
node test/e2e-oauth.mjs
# agent unit tests
node --test agent/test-agent-unit.mjs

Security & privacy

Events are read/written only on your Mac. The relay never persists event content — job payloads live in Redis-shaped storage with a short TTL and are deleted on delivery.
The agent token is stored at ~/.calendarbridge-agent.json (mode 600).
No secrets are committed; see .gitignore and the .env.example files.
Write tools are marked destructive so ChatGPT asks before changing an event.

Calendar Bridge

Add this server

Host a copy with our keys and logs.

Related MCP

Related skills

Questions

📅 CalendarBridge

For users — 3 steps

Managing the agent

What ChatGPT can do

Self-hosting

How it works

Repository layout

Development

Security & privacy

License

Calendar Bridge

Add this server

Host a copy with our keys and logs.

Related MCP

Related skills

Questions

📅 CalendarBridge

For users — 3 steps

Managing the agent

What ChatGPT can do

Self-hosting

How it works

Repository layout

Development

Security & privacy

License