brute_force_xor · Crypto Tools MCP Server MCP: Risk & Policy

WHAT IT DOES

What brute_force_xor does on Crypto Tools MCP Server

AI agents invoke brute_force_xor to trigger actions in Crypto Tools MCP Server. 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 brute_force_xor needs a policy

The tool executes a brute-force attack process (trying all possible key values) against XOR-encrypted data. This is an active computational operation rather than a simple read/query. While the tool itself is a cryptanalysis utility within a compliance/analysis server context, misuse could enable decryption of protected data without authorization.

From the tool's definition 'Brute force XOR cipher with single-byte or short keys' — actively runs a brute-force cryptanalytic operation against XOR-encoded data

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

brute_force_xor Rate-limited

brute_force_xor 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": {
    "brute_force_xor": {
      "limits": [
        {
          "counter": "brute_force_xor_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 Crypto Tools MCP Server, so you can run agents against it safely.

FAQ

Questions about brute_force_xor

What does the brute_force_xor tool do? +

Brute force XOR cipher with single-byte or short keys. It is categorised as a Execute tool in the Crypto Tools MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on brute_force_xor? +

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

What risk level is brute_force_xor? +

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

Can I rate-limit brute_force_xor? +

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

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

brute_force_xor is provided by the Crypto Tools MCP Server MCP server (marc-shade/crypto-tools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.