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gmail-fan

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gmail-fan

Local-first macOS Gmail gateway: synchronize several Gmail or Google Workspace accounts into SQLite, search them quickly, and expose the same operations through a JSON CLI and a local stdio MCP server.

Gmail is the source of truth. OAuth tokens live in the macOS Keychain. There is no bundled model, embeddings index, or model-provider SDK.

Requirements

  • macOS (Keychain + LaunchAgent)

  • Bun 1.4 or newer

  • A Google Cloud project with the Gmail API enabled and an OAuth Desktop client JSON

Related MCP server: Gmail Local MCP

Install and first account

bun install
bun run build
bun src/cli/main.ts init --oauth-client ./client_secret.json
bun src/cli/main.ts accounts add --alias work
bun src/cli/main.ts sync
bun src/cli/main.ts search "quarterly planning" --json

Production paths:

~/Library/Application Support/gmail-fan/
~/Library/Logs/gmail-fan/

Development

bun install
bun run test:unit
bun run test:integration
bun run typecheck
bun run check
bun run build

Architecture

Gmail accounts
      ↓
Gmail API + separate OAuth grant per account
      ↓
Synchronization service
      ↓
SQLite + FTS5
      ↓
Shared application service layer
      ↓
CLI            Local MCP server (stdio)

Decisions: docs/adr. Security: docs/security.md. CLI: docs/cli.md. MCP: docs/mcp.md. Demo: docs/demo.md.

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivitySlowing
ResponsivenessNo issues

Resources

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