What is bookshelf-mcp AGENTS.md?

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.

Developing, testing, and maintaining the Bookshelf MCP server and its read and write operations.

They define how the server is tested, authenticated, and organised, while limiting the tool list so its API description does not overwhelm the assistant.

How arr-mcps/bookshelf-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to arr-mcps/bookshelf-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/arr-mcps/bookshelf-mcp/main/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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/arr-mcps/bookshelf-mcp/agents-md/github.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/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/arr-mcps/bookshelf-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/arr-mcps/bookshelf-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" 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. 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	$0.01385	$0.01385
Opus 5.5	$0.00554	$0.00554
Sonnet 5.5	$0.00277	$0.00277
Haiku 4.5	$0.00138	$0.00138

Measured 2mo ago against content hash 4141cf9bb80c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 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.

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.

2mo 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 2d ago), licensed MIT. It adds 1,385 tokens to every session, about $0.0055 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.

Backend and APIs

bookshelf-mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
bookshelf-mcp AGENTS.mdarr-mcps/bookshelf-mcp	Instructions file	0	2d ago	MIT	A	1,385	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

bookshelf-mcp: Instructions file for Codex