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Frontier MCP Server

by openfrontier Your server? Claim it
not responding

Frontier is listed as active in the registry but did not answer our last check. It exposes 3 tools.

Discover Frontier inference capabilities and read sanitized usage through read-only tools.

Uptime history 86 days of history · worst day 0%
86 days agonow
0.0%
Uptime 24h
0 of 92 checks
3
Tools
read from the server
29 ms
Response time
average over 24h
open, no key
Access
streamable-http

Frontier does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

run in your terminal
claude mcp add frontier --transport http https://openfrontier.dev/mcp
Settings → Connectors → Add custom connector, then paste this address
https://openfrontier.dev/mcp
~/.codex/config.toml
[mcp_servers.frontier]
url = "https://openfrontier.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "frontier": {
      "url": "https://openfrontier.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "frontier": {
      "type": "http",
      "url": "https://openfrontier.dev/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

capabilities
get_capabilities
Get the public endpoints, stable aliases, and exact Chat Completions constraints.
models
list_models
List Frontier's current stable public model aliases.
usage
get_usage
Read usage for the Frontier bearer API key on this MCP HTTP request.

Endpoints

URLTransportStateLatencyChecked
https://openfrontier.dev/mcp streamable-http answering 29 ms 5 min ago

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Frontier — questions

Answers built from our own checks of this server.

What can Frontier do?
It exposes 3 tools, read directly from the server on our last check. Among them: get_capabilities, get_usage, list_models. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Frontier working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 92 checks got a reply (0.0%), average response time 29 ms. The bar chart above shows every period we have measured.
The registry lists Frontier 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 Frontier?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Frontier need an API key?
No. Frontier completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.