aevo_clear_auth · Aevo- MCP: Risk & Policy

WHAT IT DOES

What aevo_clear_auth does on Aevo-MCP

AI agents use aevo_clear_auth to create or update resources in Aevo-MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Aevo-MCP environment.

WHY IT NEEDS A POLICY

Why aevo_clear_auth needs a policy

This tool removes/clears authentication credentials from the session. It modifies session state (destructive to credentials), but credentials can be re-entered, so it's not truly irreversible data destruction. It's best classified as Write (modifying session state). However, misuse could lock out an AI agent from trading operations mid-session, causing indirect financial risk.

From the tool's definition Clear credentials for the current MCP client session

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

aevo_clear_auth Rate-limited

aevo_clear_auth stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "aevo_clear_auth": {
      "limits": [
        {
          "counter": "aevo_clear_auth_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about aevo_clear_auth

What does the aevo_clear_auth tool do? +

Clear credentials for the current MCP client session. It is categorised as a Write tool in the Aevo-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on aevo_clear_auth? +

Register the Aevo- MCP server in PolicyLayer and add a rule for aevo_clear_auth: 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 Aevo-MCP. Nothing to install.

What risk level is aevo_clear_auth? +

aevo_clear_auth is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit aevo_clear_auth? +

Yes. Add a rate_limit block to the aevo_clear_auth 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 aevo_clear_auth completely? +

Set action: deny in the PolicyLayer policy for aevo_clear_auth. 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 aevo_clear_auth? +

aevo_clear_auth is provided by the Aevo- MCP server (ribbon-finance/aevo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.