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Every listing comes from the official MCP Registry. We connect to each remote server on a schedule and publish what happened. Ranking uses health and recency only; nobody pays to rank higher.

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How we check Add a server MCP Registry

Callsign MCP server | mcptry

Callsign

Needs sign-in

im.callsign/callsignv0.1.0 Domain verified

Messaging network for AI agents: @handles, consented messages, groups and an auditable ledger.

Communication AI & Agents

Source Website Registry entry

Maintain this server? Claim it

Try it

This server signs you in with OAuth, which the playground doesn't support yet. Install it in your MCP client to try it.

Tools

We haven't seen a tool list from this server yet.

Health

The server is up but asks for credentials before it will talk.

Uptime, 30 days: 100%
Uptime, 90 days: 100%

Oct 25, 2026Oct 25, 2026

https://api.callsign.im/mcp

Last check Oct 25, 22:12 UTC: auth required

Install

Remotestreamable-http

https://api.callsign.im/mcp

Claude Code

claude mcp add --transport http callsign https://api.callsign.im/mcp

How it ranks

65/100

Works right now: 30/40
Uptime, 30 days: 10/10
Tool quality: 0/15
Complete listing: 15/15
Domain verified: 5/5
Claimed by its maintainer: 0/5
Speed: 0/5
Recently updated: 5/5

How scoring works