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bookshelf-mcp AGENTS.md

bookshelf-mcp AGENTS.md is an instructions file for Codex, OpenCode from arr-mcps/bookshelf-mcp. It costs 1,385 tokens per session, scanned A, original, MIT.

Instruction files for a server that exposes Bookshelf’s REST API as AI tools. Bookshelf is a Readarr-based service for managing authors, books, files, series, downloads, and related library data.

In plain words
What is it for?
Developing, testing, and maintaining the Bookshelf MCP server and its read and write operations.
Why use it?
They define how the server is tested, authenticated, and organised, while limiting the tool list so its API description does not overwhelm the assistant.

Instructions file for CodexOpenCode

not rated 0 8d ago A scan 1,385 tokens original MIT
View the source file arr-mcps/bookshelf-mcp
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/arr-mcps/bookshelf-mcp/agents-md
Clone the repo
git clone --depth 1 https://github.com/arr-mcps/bookshelf-mcp

Made for: Codex, OpenCode.

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.

agentmods badge for bookshelf-mcp AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/arr-mcps/bookshelf-mcp/agents-md.svg)](https://agentmods.dev/instructions/arr-mcps/bookshelf-mcp/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/arr-mcps/bookshelf-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/arr-mcps/bookshelf-mcp/agents-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,385 This file is loaded in full into every session.
When invoked 1,385 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.01385 $0.01385
Opus 5 $0.00692 $0.00692
Sonnet 5 $0.00277 $0.00277
Haiku 4.5 $0.00138 $0.00138

Measured 4d ago against content hash 4141cf9bb80c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bookshelf-mcp AGENTS.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 4d 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.

AGENTS.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — bookshelf-mcp

MCP server exposing Bookshelf's v1 REST API (Readarr fork, OpenAPI 3.0.1) as tools so an LLM can read and manage a Bookshelf instance: authors, books, book files, editions, series, queue, history, indexers, import lists, custom formats, tags, commands, system status, and more. Full surface — reads and writes. Uses FastMCP, uv for deps.

Exposed as 15 resource-scoped portmanteau tools, not one tool per endpoint — see "Tool registry and the spec" below. A prior version registered all 221 endpoints individually; that blew the MCP context budget (~221 tools × ~250 tokens ≈ 55k tokens just for this one server) and has been retired.

Testing

  • Offline suite: make test (or uv run pytest)
  • Live integration (needs BOOKSHELF_URL/BOOKSHELF_API_KEY): make test-integration
    • GET endpoints run against the live instance.
    • POST/PUT/DELETE only run when BOOKSHELF_WRITE_TESTS=1 (safe create→update→delete cycles against a scratch tag, then cleanup). Never point write tests at a production library.

Tool registry and the spec

  • _TOOL_REGISTRY in bookshelf_mcp.py is generated from the vendored spec at tests/data/bookshelf_openapi.json by scripts/generate_registry.py. It lists every JSON-producing endpoint under /api/v1 plus GET /ping.
  • Excluded on purpose: /login, /logout, /api (swagger metadata), static web routes, the .ics calendar feed, and binary/text endpoints (media covers, raw log files) — _req JSON-decodes every response.
  • To add a tool or refresh coverage, edit scripts/generate_registry.py (add NAME_OVERRIDES/DOC_OVERRIDES) and regenerate from the vendored spec, then re-run the tests. Do not hand-edit the registry.
  • Endpoint function naming (internal, no longer an MCP tool name): bookshelf_<verb>_<resource> derived from path + method (e.g. bookshelf_list_author, bookshelf_create_author, bookshelf_delete_author, bookshelf_run_command). Overrides for flagship/action endpoints live in the authoring script.

Read the full file on GitHub · 55 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.

  1. 4d ago First seen · 55 lines · 1,385 tokens per session scan A 4141cf9bb80c

Subscribe to this mod's changes

bookshelf-mcp AGENTS.md is an instructions file published in the GitHub repository arr-mcps/bookshelf-mcp (0 stars, last pushed 8d ago), licensed MIT. It adds 1,385 tokens to every session, about $0.0069 per session on Opus 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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