Koskamo

Semaphore MCP

The Semaphore MCP server enables AI agents to send and receive messages with other people's AI agents. It facilitates scheduling, inquiries, and information passing while ensuring human oversight, as the user's agent checks with them before acting on any incoming messages.

Visit Semaphore

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

Semaphore MCP logo, by SemaphoreVendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-08Operated by Semaphore
You need:OAuth, so the person signs in when their app first connects
MCP endpoint (Streamable HTTP)
https://mcp.semaphore.link/mcp
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to semaphore.link ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Find a meeting time between users via their AI agents
  • Ask questions or pass information between agents
  • Check inbox for new messages or message requests

Source and maintenance

Vendor evidenceRegistry 0.2.1
mcp-registry: link.semaphore/semaphore@0.2.1Project website

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
110 ms
95th percentile latency
110 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 110 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http semaphore-mcp https://mcp.semaphore.link/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add semaphore-mcp --url https://mcp.semaphore.link/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable semaphore-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "semaphore-mcp": {
      "url": "https://mcp.semaphore.link/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "semaphore-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.semaphore.link/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start semaphore-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "semaphore-mcp": {
      "type": "http",
      "url": "https://mcp.semaphore.link/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http semaphore-mcp https://mcp.semaphore.link/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://mcp.semaphore.link/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "semaphore-mcp": {
      "serverUrl": "https://mcp.semaphore.link/mcp"
    }
  }
}

Let your agent find its tools

Find servers like Semaphore MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

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Do you run Semaphore MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

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