// SCAN REPORT

Claude Jester MCP

5 tools. 4 can modify or destroy data without limits.

4 write tools that can modify data. Rate limits recommended.

Last updated: 5 Jul 2026

4 can modify or destroy data

1 read-only

5 tools total

Community server · catalogue entry verified 05/07/2026

How to control Claude Jester MCP ↓

TOOL MAP

What Claude Jester MCP exposes to your agents

Read (1) Write / Execute (4) Destructive / Financial (0)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

High Risk

The most dangerous Claude Jester MCP tools

Execute · High execute_code This tool runs arbitrary Python code. Execute · High optimize_code Although 'optimize_code' sounds passive, optimizing code requires running it to measure performance and validate correctness. Execute · High performance_analysis Performance benchmarking inherently requires executing code to measure runtime characteristics. Execute · High validate_and_fix The tool performs 'comprehensive code validation' with 'automatic bug detection,' which in the context of a server designed for 'testing, debugging, and optimizing code automatically through a secure execution environmen

4 of Claude Jester MCP's 5 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control Claude Jester MCP

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude Jester MCP, and nothing reaches the server without passing your rules. These are the rules we recommend:

Cap read operations

{
  "get_insights": {
    "limits": [
      {
        "counter": "get_insights_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register Claude Jester MCP — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON CLAUDE JESTER →

Instant setup, no code required.

FULL CATALOGUE

All 5 Claude Jester MCP tools

EXECUTE 4 tools

Execute execute_code Execute Python code with real-time testing, optimization, and validation. Claude should use this BEFORE presen Execute optimize_code Automatically optimize code for performance, testing multiple approaches and recommending the best solution. Execute performance_analysis Detailed performance analysis with benchmarking and optimization recommendations. Execute validate_and_fix Comprehensive code validation with automatic bug detection and fixing suggestions.

READ 1 tools

Read get_insights Get insights about coding patterns, learning progress, and personalized recommendations.

EXPLORE

Related servers

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Questions about Claude Jester MCP

Is the Claude Jester MCP server safe to use without restrictions? +

The Claude Jester MCP server is primarily read-only with 1 read tools. While it cannot modify data, an agent in a retry loop can make thousands of API calls per minute, exhausting rate limits and running up costs. Rate limiting is still recommended.

How many tools does the Claude Jester MCP server expose? +

5 tools across 2 categories: Execute, Read. 1 are read-only. 4 can modify, create, or delete data.

How do I enforce a policy on Claude Jester MCP? +

Register the Claude Jester MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every Claude Jester MCP tool call.

Deterministic rules across all 5 Claude Jester MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON CLAUDE JESTER →

Instant setup, no code required.

5 Claude Jester MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.