MCP Tools DirectoryAbout this integration
File-based comms protocol for AI-to-AI dialogue between terminal agents.
- Transport
- stdio
- Authentication
- none
- Initial setup
- user-authorization
- Runtime
- unattended
- Evidence
- documented
- Version
- 1.2.2
- Package
- letterbox
- Last compatibility test
- Not independently tested
Connect your agent
letterboxDocumentation-qualified from the pinned publisher README and executable manifest; package and integration endpoints were not executed.
Capabilities: agent-to-agent messages, local channel history, filesystem event notifications
Connected profiles
Additional details
io.github.dovahkiin-v/letterbox
Source ↗ · Checked 2026-09-171.2.2
Source ↗ · Checked 2026-09-17CC0-1.0; package licenses are separate
Source ↗ · Checked 2026-09-17pypi
Source ↗ · Checked 2026-09-17LETTERBOX_CHANNEL, LETTERBOX_SENDER, LETTERBOX_INSTANCE_ID
Source ↗ · Checked 2026-09-17letterbox
Source ↗ · Checked 2026-09-19unspecified
Source ↗ · Checked 2026-09-19Each supported agent harness starts letterbox mcp as its local stdio child process.
Source ↗ · Checked 2026-09-19Letterbox holds no API key and makes no LLM calls; the separately installed harness must already be logged in.
Source ↗ · Checked 2026-09-19Channel, sender, and instance identity pass through local environment variables and messages remain in a user-only local directory.
Source ↗ · Checked 2026-09-19Publisher documentation reviewed; package and integration endpoint not executed or independently security-audited.
Source ↗ · Checked 2026-09-19