What is mycelium-mcp CLAUDE.md?

A set of Claude Code instructions for the Mycelium MCP server project. It explains the server, its commands, project layout, required checks, and rules for handling uncertainty and failures.

Use it when working on the Mycelium MCP server, including running it, installing dependencies, testing it, and modifying its source.

It keeps code changes evidence-based and makes failures visible instead of hiding them. It also tells the agent to inspect files before editing them.

How SoftBacon-Software/mycelium-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to SoftBacon-Software/mycelium-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/SoftBacon-Software/mycelium-mcp/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/SoftBacon-Software/mycelium-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/softbacon-software/mycelium-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/softbacon-software/mycelium-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/softbacon-software/mycelium-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/softbacon-software/mycelium-mcp/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/softbacon-software/mycelium-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/softbacon-software/mycelium-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,393 This file is loaded in full into every session.

When invoked 1,393 The same file — it is already loaded in full.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01393	$0.01393
Opus 5.5	$0.00557	$0.00557
Sonnet 5.5	$0.00279	$0.00279
Haiku 4.5	$0.00139	$0.00139

Measured 2mo ago against content hash d7ec8c204cc3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mycelium-mcp CLAUDE.md scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

MCP (Model Context Protocol) server that wraps the Mycelium platform API as native Claude Code tools. Package name: `mycelium-mcp`. Gives Claude agents tools like `mycelium_boot`, `mycelium_claim_task`, `mycelium_heartbe

CLAUDE.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — Mycelium MCP Server

What This Is

MCP (Model Context Protocol) server that wraps the Mycelium platform API as native Claude Code tools. Package name: mycelium-mcp. Gives Claude agents tools like mycelium_boot, mycelium_claim_task, mycelium_heartbeat instead of raw curl commands. (Tools are defined internally under legacy studio_* names and registered as mycelium_* only — the studio_* aliases were dropped to stay under MCP tool limits.)

Critical Rules

No guessing: If info isn't in context, say "I don't know" or use a tool to fetch it.
No silent failures: Report failures immediately. Never pretend something worked.
Evidence-based: Verify files exist before editing. Read before writing.
Honest failure: Failing is OK. Never force "success" by modifying tests or deleting checks.

Commands

node index.js                    # Run MCP server (stdio transport)
npm install                      # Install dependencies
npm test                         # smoke gate + handler tests (no framework, Node builtins only)

Tests: test/smoke.mjs (syntax/import/export gate over every source file) and test/handlers.test.mjs (api client + tool handlers against a local mock substrate, plus an entry-point boot/shutdown gate). Run green before any publish.

Layout

index.js          # Entry point — MCP server setup, env validation, shutdown wiring
src/
  api.js          # HTTP client for Mycelium API (fetch wrapper, timeouts, error context)
  state.js        # Session state, auto-heartbeat (5min interval)
  sse.js          # SSE event stream client (reconnect with backoff)
  tools.js        # All MCP tool definitions and handlers
test/             # npm test — zero-dependency gates (not published to npm)
package.json      # mycelium-mcp

Architecture

Transport: stdio (standard MCP pattern)
Two modes: admin (full access, X-Admin-Key) and agent (scoped, X-Agent-Key, auto-heartbeat)
API target: Defaults to https://mycelium.fyi/api/mycelium. Configurable via MYCELIUM_API_URL.
Tool naming: All tools registered with mycelium_* prefix only (legacy studio_* names exist in source but are not registered — dropped to stay under tool limits).
Auto-heartbeat: In agent mode, sends heartbeat every 5 minutes. Clears working_on on shutdown.

Read the full file on GitHub · 118 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 118 lines · 1,393 tokens per session scan A d7ec8c204cc3

Subscribe to this mod's changes

mycelium-mcp CLAUDE.md is an instructions file published in the GitHub repository SoftBacon-Software/mycelium-mcp (1 stars, last pushed 1mo ago), licensed MIT. It adds 1,393 tokens to every session, about $0.0056 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Claude Code ai-agents llm-tools mcp model-context-protocol

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

mycelium-mcp: Instructions file for Claude Code