// MCP TOOL REFERENCE

maker_redeem_code

ServerCrow
CategoryExecute

WHAT IT DOES

What maker_redeem_code does on Crow

AI agents invoke maker_redeem_code 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_redeem_code needs a policy

This tool redeems a one-time code and exchanges it for a session token via an atomic database UPDATE. It is not purely a read (it mutates state by consuming the code), not a simple write (it triggers authentication/authorization side effects), and not destructive in the irreversible data-deletion sense.

From the tool's definition 'redeem a one-shot code for a session token', 'UPDATE...RETURNING so a race produces exactly one winner; expired codes fail atomically'

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

POLICY

How to control maker_redeem_code

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_redeem_code:

policy.json

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

maker_redeem_code 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_redeem_code

What does the maker_redeem_code tool do? +

INTERNAL: redeem a one-shot code for a session token. The /kiosk/r/:code HTTP handler calls this server-side. Uses UPDATE...RETURNING so a race produces exactly one winner; expired codes fail atomically. 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_redeem_code? +

Register the Crow MCP server in PolicyLayer and add a rule for maker_redeem_code: 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_redeem_code? +

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

Can I rate-limit maker_redeem_code? +

Yes. Add a rate_limit block to the maker_redeem_code 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_redeem_code completely? +

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

maker_redeem_code 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.

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