Prompt Lab MCP Server

Enables prompt optimization loops and regression test suites for Claude Code, with a companion web UI for real-time visualization of scores and prompt revisions.

→ jurek-f/prompt-lab-mcp · listed on glama

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// key findings

🚨

Secret credentials may flow to a network call

1 flow detected: UPSTASH_REDIS_REST_TOKEN. We can’t prove the destination matches the brand the credential belongs to.

⚠️

Known vulnerabilities in dependencies: 7 high

Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.

🔐

You'll be asked for 4 credentials: ANTHROPIC_API_KEY, GEMINI_API_KEY, OPENAI_API_KEY, UPSTASH_REDIS_REST_TOKEN

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

🔐 secretGEMINI_API_KEY

🔐 secretOPENAI_API_KEY

configOVERHANG_PROMPT_LAB_URL— URL of your Prompt Lab UI deployment

configOVERHANG_VOICE_URL

configPORT

🔐 secretUPSTASH_REDIS_REST_TOKEN— Upstash Redis token

configUPSTASH_REDIS_REST_URL— Upstash Redis URL for persistence

// 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 6 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/jurek-f-prompt-lab-mcp-he6xa2)](https://m8ven.ai/mcp/jurek-f-prompt-lab-mcp-he6xa2)

commit: 929e876b2fb52e28734b76fe8881374e8e0d9a4b

code hash: 9bbb1e50d15d5c745cdc0ac374019c8edb1bc24357410a66003612edb439e577

verified: 6/14/2026, 9:52:30 AM

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