crow_share

ServerCrow
CategoryWrite

WHAT IT DOES

What crow_share does on Crow

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

THE RISK

Medium Risk

Why crow_share needs a policy

This tool sends/shares data to an external contact, which is a Write operation (creating a shared artifact or transmission). It uses a two-step confirmation token pattern to prevent accidental execution. While it involves encrypted P2P sharing, it does not delete data or move money. The severity is medium because misuse could expose sensitive memories, research, or notes to unintended recipients.

From the tool's definition Share a memory, research project, source, or note with a connected contact. The data is encrypted end-to-end. Returns a preview and confirmation token on first call; pass the token back to execute.

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

POLICY

How to control crow_share

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_share:

policy.json

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

crow_share 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.

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.

LIMIT THIS TOOL →

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EXPLORE

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Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crow_share

What does the crow_share tool do? +

Share a memory, research project, source, or note with a connected contact. The data is encrypted end-to-end. Returns a preview and confirmation token on first call; pass the token back to execute.\n\nFor share_type=\. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crow_share? +

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

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

Can I rate-limit crow_share? +

Yes. Add a rate_limit block to the crow_share 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_share completely? +

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

crow_share 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 →

Free to start. No card required.

576 Crow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.