What is musicbrainz-mcp CLAUDE.md?

Projectinstructies voor de MusicBrainz-MCP-server, een koppeling waarmee een code-agent de online muziekencyclopedie MusicBrainz kan gebruiken. Ze beschrijven de opdrachten, gereedschappen, opbouw en limieten voor API-gebruik.

Voor het ontwikkelen, testen en gebruiken van de server, inclusief zoeken, opzoeken, bladeren, hoesafbeeldingen, gezondheidscontroles en bevestigde wijzigingen zoals tags, beoordelingen en collecties.

De instructies maken duidelijk hoe de server lokaal wordt gebouwd en gestart en welke regels gelden voor het aantal verzoeken aan MusicBrainz.

How chrischall/musicbrainz-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to chrischall/musicbrainz-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/chrischall/musicbrainz-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/chrischall/musicbrainz-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/chrischall/musicbrainz-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/chrischall/musicbrainz-mcp/claude-md)

Your own site

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

Per session 2,472 This file is loaded in full into every session.

When invoked 2,472 The same file — it is already loaded in full.

Security scan A 0 findings. 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	$0.02472	$0.02472
Opus 5.5	$0.00989	$0.00989
Sonnet 5.5	$0.00494	$0.00494
Haiku 4.5	$0.00247	$0.00247

Measured 2d ago against content hash f679c696cddf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

musicbrainz-mcp CLAUDE.md scanned grade A with 0 findings 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 2d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

musicbrainz-mcp

MCP server for MusicBrainz, the open music encyclopedia. Wraps the /ws/2 REST API (https://musicbrainz.org/ws/2) plus the Cover Art Archive and exposes 9 tools to Claude over stdio: 6 read-only (search/lookup/browse/cover-art/resolve/healthcheck) and 3 OAuth-authenticated, confirmation-gated writes (tags, ratings, collections).

Commands

npm run build          # tsc + esbuild bundle → dist/index.js + dist/bundle.js
npm test               # tsc typecheck + vitest run
npm run test:watch     # vitest watch
npm run test:coverage  # tsc typecheck + vitest run --coverage (v8 reporter, no thresholds)

Run locally (requires built dist/):

node dist/index.js      # reads work with no creds; writes need MUSICBRAINZ_OAUTH_*

Tool naming

All tools are prefixed musicbrainz_ and use a generic entity-enum shape rather than per-entity tools: musicbrainz_search / _lookup / _browse take an entity argument covering all 13 core MusicBrainz entities.

Architecture

src/
  version.ts      # single source of truth for VERSION (x-release-please-version)
  index.ts        # MCP server entry — runMcp({ name, version, banner, tools })
  client.ts       # MusicBrainzClient — reads (no auth), Cover Art Archive, OAuth + XML writes; throttled ≥1.1s
  entities.ts     # entity enums + MBID schema shared across tools
  xml.ts          # mmd-2.0 submission XML builders (tags / ratings)
  attribution.ts  # ATTRIBUTION_NOTE appended to data tool descriptions
  tools/
    lookup.ts       # musicbrainz_lookup
    search.ts       # musicbrainz_search
    browse.ts       # musicbrainz_browse
    coverart.ts     # musicbrainz_cover_art (Cover Art Archive)
    resolve.ts      # musicbrainz_resolve (URL → entity)
    utilities.ts    # musicbrainz_healthcheck
    tags.ts         # musicbrainz_submit_tags (OAuth, confirmation-gated)
    ratings.ts      # musicbrainz_submit_rating (OAuth, confirmation-gated)
    collections.ts  # musicbrainz_modify_collection (OAuth, confirmation-gated)
    hints.ts        # _meta.mint context-group hints (family; lookup reads, change writes, no canonical)

Read the full file on GitHub · 110 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.

2d ago Changed · +1 lines · +24 tokens per session f679c696cddf
28d ago Changed · +148 tokens per session e91242956d74
29d ago Changed · +1 lines · +45 tokens per session 686124cf403d
1mo ago Changed · +83 tokens per session d94dfab4d988
1mo ago Changed · +3 lines · +212 tokens per session 0145c2177193
2mo ago First seen · 105 lines · 1,960 tokens per session scan A e17d7c117b97

Subscribe to this mod's changes

musicbrainz-mcp CLAUDE.md is an instructions file published in the GitHub repository chrischall/musicbrainz-mcp (0 stars, last pushed 2d ago), licensed MIT. It adds 2,472 tokens to every session, about $0.0099 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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musicbrainz-mcp: Instructions file for Claude Code