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Cosmic MCP server

20 operations0 webhooks

Headless CMS. Manage objects, object types, media, and revisions.

Use Cosmic in Claude, ChatGPT, Cursor or another MCP client

Connect Cosmic once in Corsair, then add one MCP address to your agent.

Connect Cosmic
Setup steps for Claude, ChatGPT, Cursor and Claude Code

Building your own app on the Corsair SDK? Get API keys

Try Cosmic with your agent

Connect Cosmic, then paste this into Claude, ChatGPT or Cursor. For ideas from other apps, see the use cases.

Using Corsair, show me what you can do in Cosmic on my account, then run one read-only example and show me the result.

Runs once, when you ask

Cosmic tools and triggers

Tools are what your agent can do in Cosmic through Corsair's MCP server. Triggers are the Cosmic events a routine can start from.

Objects

  • BatchWrite

    Run up to 25 Object operations in one request

    objects.batch

  • DeleteWrite

    Delete an Object by id

    objects.delete

  • FindRead-only

    List Objects in a Bucket with filtering and pagination

    objects.find

  • Find OneRead-only

    Get a single Object by type and slug

    objects.findOne

  • Get By IdRead-only

    Get a single Object by id

    objects.getById

  • InsertWrite

    Create an Object in a Bucket

    objects.insert

  • UpdateWrite

    Update an Object by id

    objects.update

Media

  • DeleteWrite

    Delete Media by id

    media.delete

  • FindRead-only

    List Media in a Bucket

    media.find

  • Find OneRead-only

    Get a single Media item by name

    media.findOne

  • InsertWrite

    Upload Media to a Bucket

    media.insert

  • UpdateWrite

    Update Media metadata by id

    media.update

Connect Cosmic to Claude, ChatGPT or Cursor

  1. 1

    Connect Cosmic in Corsair

    Add your Cosmic API key once in Corsair. Corsair stores the credential encrypted and makes the Cosmic API calls for your agent, so it never goes into a prompt or a config file. Connect Cosmic

    If your link lets the agent add apps, you can skip this: it gives you a sign-in link the first time it needs Cosmic. On a ChatGPT personal plan, connect Cosmic here first.

  2. 2

    Add Corsair's MCP server to your agent

    Every client uses the same address:

    https://mcp.corsair.dev/mcp
    Open Customize → Connectors → Add custom connector, paste the address, then select Connect.

    Codex, Gemini CLI, VS Code, Zed and other clients with OAuth sign-in work the same way. Clients without it, such as GitHub Copilot's coding agent, use a link's own address and an API key. Setup for every client

  3. 3

    Sign in and choose what needs your approval

    Your client opens Corsair to sign in. Pick a link: the apps your agent can use and a mode that decides what it may do without asking. None of Cosmic's operations are destructive, so in the default Cautious mode they all run right away. Strict mode asks before each of its 11 writes, and Read mode allows reads only.

FAQ

Install corsair and @corsair-dev/cosmic, add the Cosmic plugin, and connect with an API key. Then call methods like corsair.cosmic.api.media.delete() from your app. Corsair keeps each tenant isolated.

Yes. Cosmic requires an API key from your Cosmic account or developer dashboard. Create credentials with access that matches what you automate, then paste them into Corsair or connect through managed auth in Hub.

Yes. One Corsair client can hit Cosmic, GitHub, Notion, Stripe, and the rest. Trigger Cosmic from a webhook, push updates to Slack, or chain actions across plugins. Same tenant context across integrations, plain TypeScript.

Teams use Corsair for headless cms. manage objects, object types, media, and revisions. Common builds include sync jobs, admin tooling, and agents that call Cosmic APIs from your backend.

The SDK is open source. Self-host and you pay Corsair nothing for the integration layer. Hub bills for hosted auth and execution, not per Cosmic API call. Hub has a generous free tier. For hobby projects you can probably run the whole thing on free. Paid plans start to matter with more tenants or heavier traffic.

We maintain @corsair-dev/cosmic in the open repo. When Cosmic ships API changes, upgrade the package. Your call sites stay typed. You should not need to rewrite the integration layer each time.

No. Corsair does not read your Cosmic data or hold individual access credentials. Credentials stay in your database. API calls run on your instance. We do not store Cosmic data on your behalf.

Yes. Add https://mcp.corsair.dev/mcp as a custom connector or MCP server in Claude, ChatGPT, Cursor, VS Code, Claude Code, Codex or any client that supports remote MCP servers with OAuth sign-in, then sign in to Corsair. On ChatGPT personal plans, custom servers currently get read tools only.

Yes. Put Cosmic on a link in Strict mode and every write waits for your approval, while destructive actions are refused. None of the Cosmic operations are destructive, so the default Cautious mode runs them all without asking. You can change a link's mode at hub.corsair.dev/me.