ugf_authenticate · Universal Gas Framework MCP Server MCP

WHAT IT DOES

What ugf_authenticate does on Universal Gas Framework MCP Server

AI agents invoke ugf_authenticate to trigger actions in Universal Gas Framework MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why ugf_authenticate needs a policy

This tool performs an authentication operation — signing a nonce with a private key and submitting the signature to obtain a JWT. It triggers an external authentication flow (signing + server-side session creation), making it an Execute-category action. It doesn't merely read data, nor does it directly write user data or move funds.

From the tool's definition Agent signs the nonce from ugf_get_nonce with its private key and passes the signature here. Returns JWT for agent to cache.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ugf_authenticate Rate-limited

ugf_authenticate stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ugf_authenticate": {
      "limits": [
        {
          "counter": "ugf_authenticate_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Universal Gas Framework MCP Server, so you can run agents against it safely.

FAQ

Questions about ugf_authenticate

What does the ugf_authenticate tool do? +

Complete UGF login. Agent signs the nonce from ugf_get_nonce with its private key and passes the signature here. Returns JWT for agent to cache. It is categorised as a Execute tool in the Universal Gas Framework MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ugf_authenticate? +

Register the Universal Gas Framework MCP Server MCP server in PolicyLayer and add a rule for ugf_authenticate: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Universal Gas Framework MCP Server. Nothing to install.

What risk level is ugf_authenticate? +

ugf_authenticate is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit ugf_authenticate? +

Yes. Add a rate_limit block to the ugf_authenticate rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block ugf_authenticate completely? +

Set action: deny in the PolicyLayer policy for ugf_authenticate. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides ugf_authenticate? +

ugf_authenticate is provided by the Universal Gas Framework MCP Server MCP server (tychiwallet/ugf-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.