Borrowing it
Nothing to install: this file belongs to alessiomarcone/agent-fieldbook. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/alessiomarcone/agent-fieldbook/main/AGENTS.mdgit clone --depth 1 https://github.com/alessiomarcone/agent-fieldbookWrote 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.
[](https://agentmods.dev/instructions/alessiomarcone/agent-fieldbook/agents-md)<a href="https://agentmods.dev/instructions/alessiomarcone/agent-fieldbook/agents-md"><img src="https://agentmods.dev/badge/instructions/alessiomarcone/agent-fieldbook/agents-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00329 | $0.00329 |
| Opus 5 | $0.00164 | $0.00164 |
| Sonnet 5 | $0.00066 | $0.00066 |
| Haiku 4.5 | $0.00033 | $0.00033 |
Grade A, and why
agent-fieldbook AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Repository guide
This repository distributes one skills-only, product-aware knowledge plugin for Claude and Codex. Keep changes source-backed, compact, and compatible with both manifests.
Canonical files
- Keep the three naming layers distinct: public brand
Agent Fieldbook, marketplaceagent-fieldbook, and plugin namespaceknowledge-pack. - Treat
knowledge-base.md, every file underknowledge/,knowledge-card-prompt.md, andknowledge-card.schema.jsonas canonical. - After editing any of them, run
python3 scripts/sync_pack.pyto refresh the self-contained skill copies. - Keep plugin versions aligned across
manifest.json, both plugin manifests, and.claude-plugin/marketplace.json. - Keep Claude and Codex commands, manifests, agent configuration, and permission rules in separate references. Never translate fields by analogy.
Skill rules
- Keep each folder name equal to the
nameinSKILL.md. - Use lowercase hyphen-case without reserved vendor names.
- Put activation cues in the frontmatter
descriptionand detailed material inreferences/. - Keep
agents/openai.yamlaligned with each skill and mention$skill-namein its default prompt. - Do not add raw transcripts, copied course lessons, secrets, or private data.
Validation
Run before handing off changes:
python3 scripts/validate_pack.py
python3 -m unittest discover -s tests -v
claude plugin validate . --strict
claude plugin validate plugins/knowledge-pack --strict
The Claude commands are optional only when the CLI is unavailable.
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.
- 8d ago First seen · 33 lines · 329 tokens per session scan A 0d07b88aa0a5
agent-fieldbook AGENTS.md is an instructions file published in the GitHub repository alessiomarcone/agent-fieldbook (5 stars, last pushed today), licensed MIT. It adds 329 tokens to every session, about $0.0016 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.
Other instructions, from other repositories
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.