gmail-fan
Synchronizes multiple Gmail and Google Workspace accounts into a local SQLite database and exposes search and mailbox operations through a stdio MCP interface.
README
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
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.
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