chronos-mcp 0.1.3

Local-first email and calendar inbox for AI agents

Chronos — agent-inbox

Local-first email and calendar inbox for AI agents. Syncs Gmail and Google Calendar into a single queryable SQLite database and exposes all data through an MCP server.

Features

• Sync multiple Gmail and Google Calendar accounts into one SQLite database
• Full-text search via FTS5 (messages and events)
• MCP server at localhost:7071/sse for agent integration
• HTTP REST API at localhost:7070 for direct queries
• Read-only SQL interface via POST /v1/query
• Optimistic event writes with provider-wins conflict resolution
• Incremental sync with historyId (Gmail) and syncToken (Calendar)
• ULID primary keys, WAL mode, no cloud dependencies at query time

Installation

pipx install chronos-mcp

Or from source:

git clone https://github.com/CourtimusPrime/chronos.git
cd chronos
pip install -e .

Setup

Prerequisites

1. Go to console.cloud.google.com
2. Create a project and enable Gmail API and Google Calendar API
3. Create an OAuth client ID (Desktop app type)
4. Download the credentials JSON file

Register an account

Run chronos --help for full Google Cloud Console setup instructions.

# Step 1: Stage your credentials (Desktop app OAuth JSON from Google Cloud Console)
chronos --use /path/to/credentials.json

# Step 2: Register an account (opens browser for OAuth2 consent)
chronos --add personal

Staged credentials persist until the next --use call, so you can register multiple accounts with one credentials file:

chronos --use /path/to/credentials.json
chronos --add personal
chronos --add work

The --add step:

• Writes ~/.chronos/personal_token.json (self-contained token file)
• Creates two rows in the accounts table (gmail + google_calendar)
• Prints a confirmation summary

Start syncing

chronos --start

The daemon starts on 127.0.0.1:7070 (HTTP) and 127.0.0.1:7071 (MCP/SSE).

CLI Reference

chronos --use CREDENTIALS_PATH          # Stage a credentials JSON for --add
chronos --add ALIAS                     # Register a new account (requires prior --use)
chronos --remove ALIAS                  # Remove an account and its data
chronos --list                          # List all registered accounts
chronos --test ALIAS                    # Test account tokens
chronos --start [--http-port N] [--mcp-port N]  # Start daemon
chronos --stop                          # Stop the running daemon (preserves synced data)
chronos --status                        # Show sync status
chronos --sync [ALIAS] [--type full|incremental]  # Trigger sync

Ctrl+C vs --stop: Pressing Ctrl+C while chronos --start is running wipes synced data (emails, threads, events, calendars) but preserves accounts. Use chronos --stop from another terminal for a clean shutdown that preserves data.

Run chronos --help for Google Cloud Console setup steps.

Environment Variables

Variable	Default	Description
CHRONOS_HOME	~/.chronos	Credentials and database directory
CHRONOS_DB_PATH	$CHRONOS_HOME/chronos.db	SQLite database file
CHRONOS_HTTP_PORT	7070	HTTP API port
CHRONOS_MCP_PORT	7071	MCP server port
CHRONOS_LOG_LEVEL	INFO	Log level

License

MIT