Letterbox
io.github.dovahkiin-v/letterbox · Status: active
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- Registry name
io.github.dovahkiin-v/letterbox- Package coordinate
pypi:letterbox- Version
1.2.2- Listed in the registry
- 2026-08-24
- Changed in the registry
- 2026-08-24
- First seen by tracevero
- 2026-08-25
- Vendor's website
- https://github.com/dovahkiin-v/letterbox
File-based comms protocol for AI-to-AI dialogue between terminal agents.
Vendor's own description, untranslated and unverified
Evidence for this page: The values on this page come from several collections. Each row therefore states its own origin. What the confidence levels mean
Measured values
| Credentials required | no Raw declaration – Required secret variables (raw): confirmed absent Raw declaration – Required secret headers (raw): confirmed absent Source: MCP-Register · collected on 2026-08-25 · derived |
|---|---|
| Execution location | local Raw declaration – Transports (raw): stdio Source: MCP-Register · collected on 2026-08-25 · derived |
| Path argument present | no Raw declaration – Path arguments (raw): confirmed absent Raw declaration – Path environment variables (raw): confirmed absent Source: MCP-Register · collected on 2026-08-25 · derived |
| Repository URL listed | yes Raw declaration – Repository (raw): https://github.com/dovahkiin-v/letterbox Source: MCP-Register · collected on 2026-08-25 · derived |
| Version | 1.2.2 Source: MCP-Register · collected on 2026-08-25 · self-declared |
Position within the holdings
How many of the 25,100 published entries carry the same measured value. A reference figure, not an assessment.
- Credentials requiredno20,735 of 25,100 carry this value (83 %)View these entries
- Execution locationlocal12,344 of 25,100 carry this value (49 %)View these entries
- Path argument presentno24,857 of 25,100 carry this value (99 %)View these entries
- Repository URL listedyes19,482 of 25,100 carry this value (78 %)View these entries
All 4 values together are carried by 8,664 of 25,100 entries.
This entry appears in these selections
- MCP servers without credentials20,735
- Locally executed MCP servers12,344
- MCP servers with a repository URL19,482
- Local MCP servers without credentials9,365
- Local MCP servers with a repository URL11,717
- MCP servers over stdio only10,041
- MCP servers as a PyPI package only3,120
- Local MCP servers as a PyPI package only3,101
- MCP servers available as a package only10,841
The source's raw values24
Evidence for this page: The values on this page come from several collections. Each row therefore states its own origin.
| Description (raw) | File-based comms protocol for AI-to-AI dialogue between terminal agents. Source: MCP-Register · collected on 2026-08-26 · self-declared |
|---|---|
| Environment variables (raw) | LETTERBOX_CHANNEL, LETTERBOX_SENDER, LETTERBOX_INSTANCE_ID Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Required secret variables (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Transports (raw) | stdio Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Path arguments (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Repository (raw) | https://github.com/dovahkiin-v/letterbox Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Package registries (raw) | pypi Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Required secret headers (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Path environment variables (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Remote URLs (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Remote hosts (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Registry status message (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| First listed in the registry (raw) | 2026-08-24 Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Last changed in the registry (raw) | 2026-08-24 Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Schema version of the raw record (raw) | https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Delivery form (raw) | paket Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Repository platform (raw) | github Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Repository subfolder (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Package identifiers (raw) | letterbox Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Package versions (raw) | 1.2.2 Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Runtime hints (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Environment variable formats (raw) | string Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Environment variable descriptions (raw) | LETTERBOX_CHANNEL=Channel name to open. Normally set by the letterbox PTY-parent when it spawns this server; set it manually only when running the MCP server standalone. · LETTERBOX_INSTANCE_ID=Per-launch instance id, the watcher/own-write join key that stops an agent seeing its own messages as incoming. Must be unique per launch. · LETTERBOX_SENDER=This endpoint's identity on the channel — the name the peer agent sees on every message. Source: MCP-Register · collected on 2026-08-25 · self-declared |
| Icon formats (raw) | confirmed absent Source: MCP-Register · collected on 2026-08-25 · self-declared |
Changes
| 2026-08-26 | Description (raw): – → File-based comms protocol for AI-to-AI dialogue between terminal agents. |
|---|---|
| 2026-08-25 | Version: – → 1.2.2 |
| 2026-08-25 | Repository URL listed: – → true |
| 2026-08-25 | Path argument present: – → false |
| 2026-08-25 | Execution location: – → local |
| 2026-08-25 | Credentials required: – → false |
| 2026-08-25 | Last changed in the registry (raw): – → 2026-08-24 |
| 2026-08-25 | First listed in the registry (raw): – → 2026-08-24 |
| 2026-08-25 | Registry status message (raw): – → – |
| 2026-08-25 | Schema version of the raw record (raw): – → https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json |
These are the 10 most recent changes to this entry. Full history
tracevero · https://tracevero.com/mcp/io-github-dovahkiin-v-letterbox