crypto_test_harness

Run extracted crypto code in worker_threads + vm sandbox and return deterministic test results.

SERVERJshookmcp SOURCE@jshookmcp/jshook

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-vmoranv-jshookmcp/crypto-test-harness.md

WHAT IT DOES

What crypto_test_harness does on Jshookmcp

AI agents invoke crypto_test_harness to trigger actions in Jshookmcp. 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.

RISK

Why crypto_test_harness is rated High

Executes arbitrary crypto code in a sandbox; misuse could run malicious code.

From the tool's definition Run extracted crypto code in worker_threads + vm sandbox

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs crypto_test_harness safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For crypto_test_harness, this is the rule to start with:

crypto_test_harness Rate-limited

crypto_test_harness 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": {
    "crypto_test_harness": {
      "limits": [
        {
          "counter": "crypto_test_harness_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every crypto_test_harness call is checked against it from then on.

FAQ

Questions about crypto_test_harness

What does the crypto_test_harness tool do? +

Run extracted crypto code in worker_threads + vm sandbox and return deterministic test results. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on crypto_test_harness? +

Register the Jshook MCP server in PolicyLayer and add a rule for crypto_test_harness: 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 Jshookmcp. Nothing to install.

What risk level is crypto_test_harness? +

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

Can I rate-limit crypto_test_harness? +

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

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

crypto_test_harness is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Jshook, and thousands of servers like it.

This server

All 736 Jshook tools → High-risk tools on this server →

Across the catalogue

emit_harness on 0sec →execute_test_case on Percepta MCP Server → All high-risk MCP tools → The MCP Attack Database →

Guides

Govern code and CI agents →Agent sandbox →Least privilege for MCP →