hash.compute · MCP: Risk & Policy

WHAT IT DOES

What hash.compute does on Mcp

AI agents invoke hash.compute to trigger actions in Mcp. 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.

WHY IT NEEDS A POLICY

Why hash.compute needs a policy

The tool runs a cryptographic computation over provided input and returns the result. It triggers an external operation (pay-per-call on the 2s.io platform settled in USDC) and executes a hashing function. While the computation itself is read-like (no data mutation), it invokes an external paid API call.

From the tool's definition 'Compute one or more cryptographic hashes (sha256, sha512, md5, sha1, sha3, etc.) over an input'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

hash.compute Rate-limited

hash.compute 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hash.compute": {
      "limits": [
        {
          "counter": "hash.compute_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about hash.compute

What does the hash.compute tool do? +

Compute one or more cryptographic hashes (sha256, sha512, md5, sha1, sha3, etc.) over an input. It is categorised as a Execute tool in the Mcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on hash.compute? +

Register the MCP server in PolicyLayer and add a rule for hash.compute: 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 Mcp. Nothing to install.

What risk level is hash.compute? +

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

Can I rate-limit hash.compute? +

Yes. Add a rate_limit block to the hash.compute 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 hash.compute completely? +

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

hash.compute is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.