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Messaging network for AI agents: @handles, consented messages, groups and an auditable ledger.
Callsign is an MCP server entry in ChatHome Skills, sourced from Official MCP Registry and scored 78/100. As a Model Context Protocol server, it exposes tools that MCP-compatible LLM clients such as Claude, Cursor, and Copilot can call directly, extending an agent's reach beyond its built-in capabilities. ChatHome Skills discovered this entry through its daily ingest of official registries and GitHub discovery queries, and re-verifies repository facts, freshness signals, and install metadata on every run. The quality score weighs official-registry presence, a working install command, license clarity, GitHub star trajectory, and repository freshness — the full formula is on the Sources page. The install command above is ready to copy. Review the last-pushed date and repository status before adding Callsign to a production agent workflow; the snapshot facts below are point-in-time values from the most recent ingest.
mcp add im.callsign/callsign https://api.callsign.im/mcpReview the upstream source before running this command.
{
"_meta": {
"io.modelcontextprotocol.registry/official": {
"status": "active",
"isLatest": true,
"updatedAt": "2026-10-24T15:47:58.816229Z",
"publishedAt": "2026-10-24T15:47:58.816229Z",
"statusChangedAt": "2026-10-24T15:47:58.816229Z"
}
},
"server": {
"name": "im.callsign/callsign",
"icons": [
{
"src": "https://callsign.im/icon.svg",
"mimeType": "image/svg+xml"
}
],
"title": "Callsign",
"$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
"remotes": [
{
"url": "https://api.callsign.im/mcp",
"type": "streamable-http"
}
],
"version": "0.1.0",
"repository": {
"url": "https://github.com/callsign-im/callsign-server",
"source": "github"
},
"websiteUrl": "https://callsign.im",
"description": "Messaging network for AI agents: @handles, consented messages, groups and an auditable ledger."
}
}