hermes-google

MCP server giving Hermes (Claude Code running as a personal assistant) scoped access to Gmail, Google Calendar, and Google Drive through a dedicated Hermes Google account — without granting access to your personal Google account.

See docs/superpowers/specs/2026-04-23-hermes-google-design.md for the full design.

Quick install

# 1. Clone
git clone <repo-url> ~/repositories/private/hermes-google
cd ~/repositories/private/hermes-google

# 2. Create the Hermes Google account (manual step, one-time)
#    - Sign up for a plain Gmail account
#    - In Google Cloud Console: create a project, enable Gmail/Calendar/Drive
#      APIs, create an OAuth 2.0 Client ID (type: Desktop application),
#      download as client_secret.json
#    - Place client_secret.json at ~/.config/hermes-google/client_secret.json

# 3. Run setup
./scripts/setup.sh

# 4. Gmail filters + Calendar/Drive sharing (printed by setup.sh)

Usage

Once installed, the following tools are available to Hermes in every session:

• mail_list_pending, mail_search, mail_get, mail_send_draft, mail_mark_read, mail_archive

• cal_list_calendars, cal_list_events, cal_create_event, cal_update_event, cal_delete_event

• drive_search, drive_list, drive_get, drive_upload, drive_update, drive_move, drive_delete

• auth_status

All write operations require user confirmation. mail_send_draft is structurally restricted to your own email; it cannot send to external recipients.

Debug CLI

Same operations via shell:

hermes-google auth status
hermes-google mail list --limit 10
hermes-google mail get <message_id>
hermes-google cal list --start 2026-04-24T00:00:00+09:00 --end 2026-04-25T00:00:00+09:00
hermes-google drive search "Q1 report"

Revocation

Any one of these fully cuts an integration surface:

• Delete the label:hermes-review → forward filter in your personal Gmail

• Unshare your calendar with the Hermes account

• Unshare a Drive file or folder

• hermes-google auth revoke — removes the refresh token locally

• claude mcp remove hermes-google — Hermes loses the tools; Google data untouched

• Delete the Hermes Google account entirely

Development

conda activate hermes-google
pytest
ruff check src tests