// MCP TOOL REFERENCE

maker_start_guest_session

ServerCrow
CategoryExecute

How to control maker_start_guest_session ↓

WHAT IT DOES

What maker_start_guest_session does on Crow

AI agents invoke maker_start_guest_session to trigger actions in Crow. 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.

THE RISK

High Risk

Why maker_start_guest_session needs a policy

This tool actively creates/mints a new session and generates a short URL and cookie, triggering external state changes (session creation, URL generation). While it doesn't persist data (explicitly 'no memories, no transcripts, no artifact save'), it executes an operation that creates live session tokens and access credentials.

From the tool's definition Mint an ephemeral guest session... Returns a direct short URL + preview cookie (no redemption code needed — no handoff)

Documented attack patterns abuse exactly the kind of access maker_start_guest_session gives an agent:

POLICY

How to control maker_start_guest_session

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for maker_start_guest_session:

policy.json

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

maker_start_guest_session 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.

Create a free account and register Crow — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

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EXPLORE

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Go deeper

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All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about maker_start_guest_session

What does the maker_start_guest_session tool do? +

Mint an ephemeral guest session (no learner profile, no memories, no transcripts, no artifact save). 30-min cap. Returns a direct short URL + preview cookie (no redemption code needed — no handoff). It is categorised as a Execute tool in the Crow MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on maker_start_guest_session? +

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

What risk level is maker_start_guest_session? +

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

Can I rate-limit maker_start_guest_session? +

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

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

maker_start_guest_session is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

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