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{
  "mcpServers": {
    "letterbox": {
      "command": "uvx",
      "args": [
        "letterbox==1.2.2"
      ],
      "env": {
        "LETTERBOX_CHANNEL": "${LETTERBOX_CHANNEL}",
        "LETTERBOX_SENDER": "${LETTERBOX_SENDER}",
        "LETTERBOX_INSTANCE_ID": "${LETTERBOX_INSTANCE_ID}"
      }
    }
  }
}

claude mcp add letterbox -e "LETTERBOX_CHANNEL=${LETTERBOX_CHANNEL}" -e "LETTERBOX_SENDER=${LETTERBOX_SENDER}" -e "LETTERBOX_INSTANCE_ID=${LETTERBOX_INSTANCE_ID}" -- uvx letterbox==1.2.2

[mcp_servers.letterbox]
command = "uvx"
args = ["letterbox==1.2.2"]
env = { "LETTERBOX_CHANNEL" = "${LETTERBOX_CHANNEL}", "LETTERBOX_SENDER" = "${LETTERBOX_SENDER}", "LETTERBOX_INSTANCE_ID" = "${LETTERBOX_INSTANCE_ID}" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "letterbox": {
      "type": "local",
      "command": [
        "uvx",
        "letterbox==1.2.2"
      ],
      "enabled": true,
      "environment": {
        "LETTERBOX_CHANNEL": "{env:LETTERBOX_CHANNEL}",
        "LETTERBOX_SENDER": "{env:LETTERBOX_SENDER}",
        "LETTERBOX_INSTANCE_ID": "{env:LETTERBOX_INSTANCE_ID}"
      }
    }
  }
}

{
  "mcpServers": {
    "letterbox": {
      "command": "uvx",
      "args": [
        "letterbox==1.2.2"
      ],
      "env": {
        "LETTERBOX_CHANNEL": "${LETTERBOX_CHANNEL}",
        "LETTERBOX_SENDER": "${LETTERBOX_SENDER}",
        "LETTERBOX_INSTANCE_ID": "${LETTERBOX_INSTANCE_ID}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=letterbox&config=eyJjb21tYW5kIjoidXZ4IiwiYXJncyI6WyJsZXR0ZXJib3g9PTEuMi4yIl0sImVudiI6eyJMRVRURVJCT1hfQ0hBTk5FTCI6IiR7TEVUVEVSQk9YX0NIQU5ORUx9IiwiTEVUVEVSQk9YX1NFTkRFUiI6IiR7TEVUVEVSQk9YX1NFTkRFUn0iLCJMRVRURVJCT1hfSU5TVEFOQ0VfSUQiOiIke0xFVFRFUkJPWF9JTlNUQU5DRV9JRH0ifX0%3D"
}

{
  "servers": {
    "letterbox": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "letterbox==1.2.2"
      ],
      "env": {
        "LETTERBOX_CHANNEL": "${LETTERBOX_CHANNEL}",
        "LETTERBOX_SENDER": "${LETTERBOX_SENDER}",
        "LETTERBOX_INSTANCE_ID": "${LETTERBOX_INSTANCE_ID}"
      }
    }
  }
}

{
  "mcpServers": {
    "letterbox": {
      "command": "uvx",
      "args": [
        "letterbox==1.2.2"
      ],
      "env": {
        "LETTERBOX_CHANNEL": "${LETTERBOX_CHANNEL}",
        "LETTERBOX_SENDER": "${LETTERBOX_SENDER}",
        "LETTERBOX_INSTANCE_ID": "${LETTERBOX_INSTANCE_ID}"
      }
    }
  }
}

extensions:
  "letterbox":
    enabled: true
    name: "letterbox"
    type: stdio
    cmd: "uvx"
    args:
      - "letterbox==1.2.2"
    envs:
      "LETTERBOX_CHANNEL": "${LETTERBOX_CHANNEL}"
      "LETTERBOX_SENDER": "${LETTERBOX_SENDER}"
      "LETTERBOX_INSTANCE_ID": "${LETTERBOX_INSTANCE_ID}"
    timeout: 300

This is a local package: the command runs on your machine.

Quality – / 100not scored

Not scored: fewer than three checks apply, usually because no remote answered a credential-free probe or the server is a local package.

protocoln/a · weight 25

n/a
protocol.modern, protocol.stateless, protocol.transport, protocol.list_ttlno remote answered a protocol handshake (not probed yet, unreachable, or local-only)

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygienen/a · weight 30

n/a
tools.descriptions, tools.description_length, tools.schemas, tools.annotations, tools.directory_hints, tools.token_cost, tools.api_dumptool list unknown (behind auth, not probed, or empty)

stabilityn/a · weight 15

n/a
stability.changes, stability.rug_pulltool list unknown

dependencies100 · weight 15

pass
deps.known_vulnsno known advisory in 31 resolved packages
pass
deps.mcp_sdk_versionmcp 1.30.0, no known advisory
pass
deps.resolvable[email protected] resolved: 31 packages

Tool list unknown · checked 2026-10-20 15:57 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 87 / 100

provenance80

livenessn/a

freshness85

hygiene100

+repository +namespace-matches-repo ~liveness-unmeasured ~updated-57d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

[email protected] PyPI30 dependencies, resolved · MCP SDK mcp 1.30.0 · advisories checked 2026-10-19

No known advisory affects this dependency graph.

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

package	registry	version	runtime	secrets
`letterbox`	pypi	1.2.2	–

Tools (0)

No tools observed. Local packages are never executed by the registry.

Schemas: list_tools.

Similar MCP servers

More from io.github.dovahkiin-v

Official server.json

{
  "name": "io.github.dovahkiin-v/letterbox",
  "title": "Letterbox",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "version": "1.2.2",
  "packages": [
    {
      "version": "1.2.2",
      "transport": {
        "type": "stdio"
      },
      "identifier": "letterbox",
      "registryType": "pypi",
      "environmentVariables": [
        {
          "name": "LETTERBOX_CHANNEL",
          "format": "string",
          "isRequired": true,
          "description": "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."
        },
        {
          "name": "LETTERBOX_SENDER",
          "format": "string",
          "isRequired": true,
          "description": "This endpoint's identity on the channel — the name the peer agent sees on every message."
        },
        {
          "name": "LETTERBOX_INSTANCE_ID",
          "format": "string",
          "isRequired": true,
          "description": "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."
        }
      ]
    }
  ],
  "repository": {
    "url": "https://github.com/dovahkiin-v/letterbox",
    "source": "github"
  },
  "description": "File-based comms protocol for AI-to-AI dialogue between terminal agents."
}