mcp-prompt-lab

A local MCP server for prompt evaluation, enabling users to define test cases, run prompts against multiple LLM providers, score outputs with deterministic and LLM-graded assertions, and track quality over time, all within an AI coding environment.

→ nikolasbarwicki/mcp-prompt-lab · listed on glama

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// key findings

✅

4 tools verified — handlers match their declared behaviour

1 read-only tool verified — handlers contain no write/delete/exec

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

✅

Open source with a license and README

Anyone can audit the code, the license is declared, and the publisher documents what it does.

🔐

You'll be asked for 5 credentials: ANTHROPIC_API_KEY, GOOGLE_GENERATIVE_AI_API_KEY, OPENAI_API_KEY, OPENROUTER_API_KEY, XAI_API_KEY

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

🔐 secretANTHROPIC_API_KEY— anthropic: anthropic:claude-sonnet-4-20250514

🔐 secretGOOGLE_GENERATIVE_AI_API_KEY— "": "${GOOGLE_GENERATIVE_AI_API_KEY}"

configLOCAL_LLM_URL— local: (optional) local:my-model

🔐 secretOPENAI_API_KEY— "": "${OPENAI_API_KEY}",

🔐 secretOPENROUTER_API_KEY— openrouter: openrouter:meta-llama/llama-4-scout

configPROMPT_LAB_DB— Override with :

🔐 secretXAI_API_KEY— xai: xai:grok-3

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 4 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/nikolasbarwicki-mcp-prompt-lab-eazzp0)](https://m8ven.ai/mcp/nikolasbarwicki-mcp-prompt-lab-eazzp0)

commit: 1c5bbe5110dbc39d78a74d109eae9c36eeaa777a

code hash: 2c79139bf3f43c5aeb42d96015b602b6e30a310427f2986bdddac2b7ddcbe1a5

verified: 6/16/2026, 1:23:58 PM

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