Proving Ground MCP Server
Proving Ground is listed as active in the registry but did not answer our last check. Last commit 6 Oct 2026.
Accounts-payable exception environment with a pass/fail verifier and proof packet: AI agents work AP
What the code does
We read the source, 2 min ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
p = subprocess.Popen(cmd, stdout=open("out/api.log", "a"), stderr=subprocess.STDOUT, start_new_session=True)
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.
claude mcp add proving-ground --transport http https://proving-ground-production.up.railway.app/mcphttps://proving-ground-production.up.railway.app/mcp[mcp_servers.proving-ground]
url = "https://proving-ground-production.up.railway.app/mcp"{
"mcpServers": {
"proving-ground": {
"url": "https://proving-ground-production.up.railway.app/mcp"
}
}
}{
"servers": {
"proving-ground": {
"type": "http",
"url": "https://proving-ground-production.up.railway.app/mcp"
}
}
}Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://proving-ground-production.up.railway.app/mcp | streamable-http | answering | 331 ms | 11 min ago |
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Proving Ground — questions
Answers built from our own checks of this server.