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Circleback MCP Server

by circleback Your server? Claim it
not responding

Circleback is listed as active in the registry but did not answer our last check.

Uptime history 51 days of history · worst day 0%
51 days agonow
33.3%
Uptime 24h
30 of 90 checks
—
Tools
hidden behind auth
370 ms
Response time
average over 24h
open, no key
Access
streamable-http

Circleback does not always answer

Over the last week it answered 59.2% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

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Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

run in your terminal
claude mcp add mcp --transport http https://app.circleback.ai/api/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "mcp": {
      "url": "https://app.circleback.ai/api/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.mcp]
url = "https://app.circleback.ai/api/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "mcp": {
      "url": "https://app.circleback.ai/api/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "mcp": {
      "url": "https://app.circleback.ai/api/mcp"
    }
  }
}

Endpoints

URLTransportStateLatencyChecked
https://app.circleback.ai/api/mcp streamable-http answering 138 ms 14 min ago

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Circleback — questions

Answers built from our own checks of this server.

Is Circleback working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 30 of 90 checks got a reply (33.3%), average response time 370 ms. The bar chart above shows every period we have measured.
The registry lists Circleback as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Circleback?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Circleback need an API key?
No. Circleback completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. This is what we observed, not what the docs claim.
How fast is Circleback?
It answers our handshake in 370 ms on average, which is faster than 43% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.