share_file · JS-Peer x DeFi MCP Server MCP: Risk & Policy

WHAT IT DOES

What share_file does on JS-Peer x DeFi MCP Server

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

WHY IT NEEDS A POLICY

Why share_file needs a policy

Sharing a file with a peer-to-peer network is a Write operation — it uploads/publishes data to the network. It is reversible in principle (the file can be unshared/withdrawn), so it does not qualify as Destructive.

From the tool's definition Share a file with the network using file exchange protocol

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 JS-Peer x DeFi MCP Server, so you can run agents against it safely.

FAQ

Questions about share_file

What does the share_file tool do? +

Share a file with the network using file exchange protocol. It is categorised as a Write tool in the JS-Peer x DeFi MCP Server 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 JS-Peer x DeFi MCP Server 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 JS-Peer x DeFi MCP Server. 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 JS-Peer x DeFi MCP Server MCP server (nkovaturient/js-peer-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.