zapier-dev-mcp

An MCP server for people who build Zapier integrations. Zapier MCP lets AI use Zapier apps — this server helps you ship one. Point Claude at your zapier-platform-cli project:

• "What's in this integration?" — triggers, creates, searches, auth, platform version, request hooks
• "Is it ready for app review?" — a lint pass encoding the things Zapier's review commonly bounces integrations for
• "Run the validator" — wraps your project's own zapier validate

Quick start

Claude Code

claude mcp add zapier-dev -- npx -y zapier-dev-mcp

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "zapier-dev": {
      "command": "npx",
      "args": ["-y", "zapier-dev-mcp"]
    }
  }
}

Then: "Lint C:\code\my-zapier-app and walk me through fixing the errors."

Tools

| Tool | What it does | |------|--------------| | inspect_integration | Structured summary of the app definition | | lint_integration | Review-readiness report: errors / warnings / info, each anchored to a component path | | generate_test_fixtures | Ready-to-run bundle mocks (typed inputData, authData from your auth fields) plus an appTester test skeleton per component | | validate_integration | Runs the project's own zapier validate (schema + style), with install guidance if the CLI is missing |

What the linter checks

• Missing operation.sample on visible actions — required for public apps, and the single most common review bounce
• Dynamic dropdowns ("trigger_key.id.label") referencing triggers that don't exist
• Missing display.label / display.description / noun; unlabeled input fields
• Definition version vs package.json version mismatch; platformVersion vs the zapier-platform-core dependency
• Auth without a connectionLabel (users can't tell accounts apart)
• Key/map-key mismatches and duplicate keys

hidden components skip the visibility checks. The linter complements zapier validate — schema validation catches malformed definitions; this catches reviewable-but-rough ones.

Notes

• Inspecting a project evaluates its entry module in a child process (with a timeout and output cap) — exactly what the Zapier CLI itself does. Only point it at projects you trust, i.e. your own.
• Computed input fields (functions) can't be linted statically; they're skipped, not flagged.
• Not affiliated with or endorsed by Zapier. zapier-platform-cli is Zapier's open-source SDK.

Development

npm install
npm test                 # offline tests — synthetic projects written in-suite
npm run build            # tsc → dist/
node scripts/smoke.mjs   # end-to-end: generates a project, drives the server over stdio

Architecture: src/extract.ts (definition extraction via child process) and src/lint.ts (pure review checks) carry the logic; src/index.ts is the MCP wiring.

License

MIT