share_file · Claude IPC MCP: Risk & Policy

WHAT IT DOES

What share_file does on Claude IPC MCP

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

WHY IT NEEDS A POLICY

Why share_file needs a policy

The tool facilitates file sharing between instances, which is a write-like operation (data is being transferred/replicated to another system component). While not destructive, it modifies the state of inter-process communication by introducing new data transfers.

From the tool's definition Tool named 'share_file' with description 'Share file content with another instance' indicates creating or transferring file data to another process/instance.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

share_file Rate-limited

share_file 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Claude IPC MCP, so you can run agents against it safely.

FAQ

Questions about share_file

What does the share_file tool do? +

Share file content with another instance. It is categorised as a Write tool in the Claude IPC MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on share_file? +

Register the Claude IPC MCP server in PolicyLayer and add a rule for share_file: 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 Claude IPC MCP. Nothing to install.

What risk level is share_file? +

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

Can I rate-limit share_file? +

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

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

share_file is provided by the Claude IPC MCP server (jdez427/claude-ipc-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.