hash_sha1

THE RISK

Low Risk

Why hash_sha1 needs a policy

SHA1 hashing is a pure computation/read operation that takes input data and produces a deterministic hash output. It has no side effects, does not modify any data, and does not interact with external systems. It only reads the input and returns a computed value.

From the tool's definition Generate SHA1 hash

Documented attack patterns abuse exactly the kind of access hash_sha1 gives an agent:

POLICY

How to control hash_sha1

PolicyLayer is an MCP gateway — it sits between your AI agents and IT Tools MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for hash_sha1:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hash_sha1": {}
  }
}

hash_sha1 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 IT Tools MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 119 IT Tools MCP Server tools →

Read 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.
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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about hash_sha1

What does the hash_sha1 tool do? +

Generate SHA1 hash. It is categorised as a Read tool in the IT Tools MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hash_sha1? +

Register the IT Tools MCP Server MCP server in PolicyLayer and add a rule for hash_sha1: 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 IT Tools MCP Server. Nothing to install.

What risk level is hash_sha1? +

hash_sha1 is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit hash_sha1? +

Yes. Add a rate_limit block to the hash_sha1 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_sha1 completely? +

Set action: deny in the PolicyLayer policy for hash_sha1. 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_sha1? +

hash_sha1 is provided by the IT Tools MCP Server MCP server (wrenchpilot/it-tools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every IT Tools MCP Server tool call.

Start from IT Tools MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →