# Baron Munchausen

Persists agent project memory locally across restarts and closed chats. Evaluates model statements and tags unbacked claims directly.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed · ★ 13
- Author: shinegang
- License: Apache-2.0 · policy=link-only · description only; the file stays with the author
- Source: https://github.com/shinegang/baron
- Updated: 2026-09-11
- HTML: https://affpapa.org/en/nevibecode/mcp/baron-munchausen

## What it does

The server stores a factual graph strictly on the local machine. Data never leaves your environment. It communicates through standard MCP input-output channels or exposes a JSON-RPC endpoint at `127.0.0.1:8765`. Calling `memory_checkpoint` retrieves 3 previous sessions alongside the last 5 project decisions.

Its built-in verification mechanism checks every answer against stored knowledge. Each sentence gets marked as `grounded`, `partial`, or `ungrounded`. Unsupported claims are listed individually. Claude Code hooks like `PreCompact` and `SessionStart` re-inject graph slices during context compaction.

Running the tool strictly requires Python 3.12. Because it relies entirely on the standard library, you will avoid package conflicts.

## Requirements
- Needs: Python and uv (commands run via uvx)

## Install

### Claude Code (native platform)

**Install**
- The MCP registry has no launch command for it: see the repository README

## When to use it
- keep project context intact across separate coding sessions
- flag fabricated claims in language model responses
- restore decision history after context window compactions
- operate a knowledge graph without third-party network requests

## Example prompts
- Inspect memory_checkpoint to review the decisions we recorded during previous sessions.
- Store the release build configuration rule in the project graph.
- Validate the latest architecture explanation and isolate ungrounded sentences.

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md