Borrowing it
Nothing to install: this file belongs to fallow-rs/fallow-skills. 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/fallow-rs/fallow-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/fallow-rs/fallow-skillsWrote 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/fallow-rs/fallow-skills/agents-md)<a href="https://agentmods.dev/instructions/fallow-rs/fallow-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/fallow-rs/fallow-skills/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.
<a href="https://agentmods.dev/instructions/fallow-rs/fallow-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/fallow-rs/fallow-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00489 | $0.00489 |
| Opus 5.5 | $0.00196 | $0.00196 |
| Sonnet 5.5 | $0.00098 | $0.00098 |
| Haiku 4.5 | $0.00049 | $0.00049 |
Grade A, and why
fallow-skills 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 18d 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.
How it starts
The opening of the file, as written. The whole thing — 48 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fallow public skills
This public repository owns portable end-user skills for the released Fallow product. It does not own Fallow maintainer workflows, private cloud knowledge, or public user documentation.
Start here
- Skill content lives under
fallow/skills/. - Each skill listed in
source-lock.jsonfollows the pinned public product contract. The lock has one entry per released Fallow skill. Each entry has a source root, a target root, and transforms. - Skills that the lock does not list, such as
fallow-review, belong to this repository. The source contract check ignores them. - Agent-specific interface files may wrap a skill, but must not fork its authored instructions.
codex-app/holds the source of the Fallow app for Codex: an MCP server and an MCP App that use the OpenAI MCP extensions.npm run buildthere writes the bundled output tofallow/codex-app/, which is committed because a plugin install runs no build step. CI rebuilds it and fails on a difference. Never editfallow/codex-app/by hand. Seecodex-app/README.md.- The OpenAI directory submission stays skills-only.
fallow/.codex-plugin/skills-only.jsontellsscripts/plugin_release.pywhich manifest fields and skills to leave out of that ZIP. - Public user guidance belongs in
fallow-rs/docs. - Open-source maintainer workflows belong in
fallow-rs/fallow.
Validation
Run:
node --test scripts/*.test.mjs
python3 -m unittest discover -s scripts -p 'test_*.py'
python3 scripts/validate_skill_frontmatter.py .
(cd codex-app && npm ci && npm run check)
FALLOW_SOURCE_DIR=/path/to/pinned/fallow node scripts/check-source-contract.mjs
The source contract check fails closed when the pinned source is absent, incorrect, or has drifted. Never copy private content or machine-local paths into this repository.
Keep skills concise, use progressive disclosure through direct references, and require a dry run before destructive Fallow operations.
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.
- 18d ago Changed · +9 lines · +161 tokens per session d3564ed88447
- 26d ago Changed · +3 lines · +52 tokens per session 5f7641c7ec9c
- 1mo ago Changed · +2 lines · +27 tokens per session 1ffbb40448ad
- 1mo ago First seen · 34 lines · 249 tokens per session scan A 612efa5edf68
fallow-skills AGENTS.md is an instructions file published in the GitHub repository fallow-rs/fallow-skills (134 stars, last pushed today), licensed MIT. It adds 489 tokens to every session, about $0.0020 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 2026-08-30.
Other instructions, from other repositories
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.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
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 copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.