login_verify · Talon MCP: Risk & Policy

WHAT IT DOES

What login_verify does on Talon

AI agents invoke login_verify to trigger actions in Talon. 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 login_verify needs a policy

Verifying a login code completes an authentication handshake and creates a session or issues credentials. This is not a simple read; it executes an external auth operation that grants access. It could be misused to hijack or complete unauthorized login attempts, making it medium severity.

From the tool's definition 'Complete login by verifying the code sent to the email address' — this triggers an authentication flow completion, which is an external operation (establishing a session/token) with side effects beyond mere data retrieval

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

login_verify Rate-limited

login_verify 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": {
    "login_verify": {
      "limits": [
        {
          "counter": "login_verify_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 Talon, so you can run agents against it safely.

FAQ

Questions about login_verify

What does the login_verify tool do? +

Complete login by verifying the code sent to the email address. It is categorised as a Execute tool in the Talon MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on login_verify? +

Register the Talon MCP server in PolicyLayer and add a rule for login_verify: 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 Talon. Nothing to install.

What risk level is login_verify? +

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

Can I rate-limit login_verify? +

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

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

login_verify is provided by the Talon MCP server (talon-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.