prompt-lab-mcp
prompt-lab-mcp is an MCP server, listed under model apis. It reaches anthropic, gemini and openai. It needs ANTHROPIC_API_KEY, GEMINI_API_KEY and OPENAI_API_KEY to authenticate. Its repository has 0 GitHub stars and is licensed under MIT; we last read it on 2026-10-22.
MCP server provides automated prompt optimization and regression testing for Claude Code, iteratively improving system prompts against target answers or validating them across test suites, with a web UI for entering queries and test cases.
Install
MCP servers are packaged differently from each other -- some run via npx, some as a Docker image, some as a plain script you clone and run. prompt-lab-mcp’s own README did not state one plainly enough for this page to quote it rather than guess, so it will not guess. The repository below states it.
What it reaches, and what it needs
What it connects to
Unverified means a mention in the server’s own description, not a citation. A wrong claim here costs nothing to correct and nothing to trust yet.
Maintenance
MCP server giving Claude Code automated prompt optimization loops and regression test suites — iteratively improve a system prompt against a target answer, or validate it across a full test suite, alongside a web UI for entering queries, test cases, and system prompts.
prompt-lab-mcp compared with similar servers
| Server | Reaches | Needs | Stars | Last update | Licence |
|---|---|---|---|---|---|
| prompt-lab-mcp (this page) | anthropic, gemini, openai | ANTHROPIC_API_KEY, GEMINI_API_KEY, OPENAI_API_KEY | 0 | 2026-06-18 | MIT |
| just-prompt | anthropic, deepseek, gemini, groq, openai(3 shared) | ANTHROPIC_API_KEY, DEEPSEEK_API_KEY, GEMINI_API_KEY, GROQ_API_KEY, OPENAI_API_KEY | 739 | 2025-08-10 | — |
| schemagate | anthropic, entra, gemini, mysql, openai, postgres, schemagate(3 shared) | ANTHROPIC_API_KEY, ENTRA_CLIENT_SECRET, GEMINI_API_KEY, OPENAI_API_KEY, SCHEMAGATE_AUDIT_SIGNING_KEY | 105 | 2026-10-22 | Apache-2.0 |
| cross-llm-mcp | anthropic, deepseek, gemini, huggingface, kimi, mistral, openai(3 shared) | ANTHROPIC_API_KEY, DEEPSEEK_API_KEY, GEMINI_API_KEY, HF_TOKEN, HUGGINGFACE_API_KEY, KIMI_API_KEY, MISTRAL_API_KEY, OPENAI_API_KEY | 16 | 2026-10-15 | MIT |
| vibeCoding-mcp | anthropic, gemini, openai(3 shared) | ANTHROPIC_API_KEY, GEMINI_API_KEY, OPENAI_API_KEY | 16 | 2025-07-09 | MIT |
| flama | anthropic, openai(2 shared) | None listed | 304 | 2026-10-13 | Apache-2.0 |
Ranked by services in common with prompt-lab-mcp, then by stars. Figures are from each repository when we last read it.
Common questions about prompt-lab-mcp
- What does prompt-lab-mcp do?
- MCP server provides automated prompt optimization and regression testing for Claude Code, iteratively improving system prompts against target answers or validating them across test suites, with a web UI for entering queries and test cases.
- How do I install prompt-lab-mcp?
- Its README did not state an install command plainly enough for us to quote one, so we do not guess. The repository has the instructions: https://github.com/jurek-f/prompt-lab-mcp
- What does prompt-lab-mcp connect to, and what does it need?
- It reaches anthropic, gemini and openai. The credentials we found in its source are ANTHROPIC_API_KEY, GEMINI_API_KEY and OPENAI_API_KEY.
- Which AI clients can use prompt-lab-mcp?
- Its own description mentions Claude Code. That is a mention in its description, not a test we ran.
- Is prompt-lab-mcp official and is it maintained?
- We found nothing naming it as a vendor’s official server. Its repository has 0 GitHub stars and its state in our directory is listed. Its last commit we recorded was on 2026-06-18.
- What licence does prompt-lab-mcp use?
- The repository declares the MIT licence.
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