# Myco: Agent-First Cognitive Substrate

An MCP server that keeps your project's context, decisions and taste, and carries them from one model generation to the next. Built for people tired of re-explaining their work.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed · ★ 65
- Author: Battam1111
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/Battam1111/Myco
- Updated: 2026-08-12
- HTML: https://affpapa.org/en/nevibecode/mcp/myco-agent-first-cognitive-substrate

## What it does

Myco is an MCP server an agent inhabits like a living armor. Between your turns it runs a metabolic cycle: new material lands as immutable history, the pilot turns that into durable understanding, stale pieces get pruned with a tombstone, and you approve any reshaping at the gate. A self-checking layer catches tampering, drift and runaway cost.

One repo holds three parts over a single wire protocol: a TypeScript operator the agent drives, a Rust substrate and a Python kernel. The doctrine governing all of it sits in the same repo, sealed by a hash chain, so the rules cannot quietly drift away from the code. There is no key to generate or hold.

You build it from source: `git clone`, then `cargo build --release --workspace`. Rust 1.80+, Node 22+ and Python 3.13+ are required. This is v0.9-genesis alpha, so expect to be early. Claude users get a ready MCP server in `operators/claude/` — drop it into `.claude/` or connect it directly.

## 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
- carry project context onto a new model without re-explaining everything
- trace why a decision was made months ago
- prune outdated working memory while keeping the history
- catch tampering or drift in what the agent has accumulated
- keep agent spend from running away

## Example prompts
- Connect the Myco MCP server from `operators/claude/` and show what entered memory today
- Run a metabolic cycle: ingest the new material and suggest what to prune
- Show which decisions from last quarter no longer match the current shape of the project

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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