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Plain MCP server

23 operations0 webhooks

Customer support platform for managing customers, threads, customer groups, companies, tiers, and users, with a raw GraphQL query endpoint.

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

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

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

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

Try Plain with your agent

Connect Plain, 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 Plain on my account, then run one read-only example and show me the result.

Runs once, when you ask

Plain tools and triggers

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

Threads

  • CreateWrite

    Create a thread for a customer.

    threads.create

  • Fetch IssuesRead-only

    Fetch external thread links for a customer and flatten as issue records.

    threads.fetchIssues

  • Get By IdRead-only

    Fetch a thread by Plain thread ID.

    threads.getById

  • List DeprecatedRead-only

    Deprecated threads listing operation; use threads.query.

    threads.listDeprecated

  • QueryRead-only

    List threads with filters, sort, and cursor pagination.

    threads.query

  • Send MessageWrite

    Reply to a thread via Plain routing.

    threads.sendMessage

  • UpdateWrite

    Update a thread title.

    threads.update

Customers

  • DeleteWrite

    Delete a customer asynchronously.

    customers.delete

  • Get By EmailRead-only

    Fetch a customer by email address.

    customers.getByEmail

  • Get By IdRead-only

    Fetch a customer by Plain customer ID.

    customers.getById

  • ListRead-only

    List customers with optional filters and cursor pagination (first/after or last/before).

    customers.list

  • UpsertWrite

    Create or update a customer by identifier.

    customers.upsert

Connect Plain to Claude, ChatGPT or Cursor

  1. 1

    Connect Plain in Corsair

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

    If your link lets the agent add apps, you can skip this: it gives you a sign-in link the first time it needs Plain. On a ChatGPT personal plan, connect Plain 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 Plain'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/plain, add the Plain plugin, and connect with an API key. Then call methods like corsair.plain.api.companies.fetch() from your app. Corsair syncs data per tenant.

Yes. Plain requires an API key from your Plain 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 Plain, GitHub, Notion, Stripe, and the rest. Trigger Plain from a webhook, push updates to Slack, or chain actions across plugins. Same tenant context across integrations, plain TypeScript.

Teams use Corsair for customer support platform for managing customers, threads, customer groups, companies, tiers, and users, with a raw graphql query endpoint. Common builds include sync jobs, admin tooling, and agents that call Plain APIs from your backend. Local DB entities let you query synced Plain records without hitting the API on every read.

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 Plain 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/plain in the open repo. When Plain 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 Plain data or hold individual access credentials. Credentials stay in your database. API calls run on your instance. We do not store Plain 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 Plain on a link in Strict mode and every write waits for your approval, while destructive actions are refused. None of the Plain 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.