crow_list_crosspost_transforms

THE RISK

Low Risk

Why crow_list_crosspost_transforms needs a policy

This tool retrieves and displays configuration data about available transform pairs for crossposting. It performs a query operation with no capability to modify, delete, or execute arbitrary operations. The pure function nature and listing operation confirm it is purely informational (Read category). Severity is low as there are no operational or security consequences from listing available transforms.

From the tool's definition Tool name includes 'list' and description states it 'List[s] the available (source, target) transform pairs', indicating data retrieval with no modification.

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

POLICY

How to control crow_list_crosspost_transforms

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 crow_list_crosspost_transforms:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crow_list_crosspost_transforms": {}
  }
}

crow_list_crosspost_transforms is read-only, so it stays allowed — but 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.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about crow_list_crosspost_transforms

What does the crow_list_crosspost_transforms tool do? +

List the available (source, target) transform pairs for crow_crosspost. Each pair is a pure function in servers/gateway/crossposting/transforms.js. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on crow_list_crosspost_transforms? +

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

crow_list_crosspost_transforms is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit crow_list_crosspost_transforms? +

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

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

crow_list_crosspost_transforms 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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