Borrowing it
Nothing to install: this file belongs to tmchow/illo-skill. 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/tmchow/illo-skill/main/AGENTS.mdgit clone --depth 1 https://github.com/tmchow/illo-skillWrote 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/tmchow/illo-skill/agents-md)<a href="https://agentmods.dev/instructions/tmchow/illo-skill/agents-md"><img src="https://agentmods.dev/badge/instructions/tmchow/illo-skill/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/tmchow/illo-skill/agents-md"><img src="https://agentmods.dev/badge/instructions/tmchow/illo-skill/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 | $0.04931 | $0.04931 |
| Opus 5.5 | $0.01972 | $0.01972 |
| Sonnet 5.5 | $0.00986 | $0.00986 |
| Haiku 4.5 | $0.00493 | $0.00493 |
Grade A, and why
illo-skill 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 1mo 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 — 368 lines — stays where its author put it; the contents beside it link to each section on GitHub.
illo-skill
The canonical home of illo, a cross-platform AI agent skill (SKILL.md
format) installable through runtime-specific lanes: the generic skills CLI
(npx skills add tmchow/illo-skill --skill illo, works across Claude
Code/Cursor/Codex and other Agent-Skills runtimes), Hermes (GitHub directory
identifier: hermes skills install tmchow/illo-skill/illo or
/skills install tmchow/illo-skill/illo; raw SKILL.md URLs are valid only
for single-file fallback installs — never for illo, which is multi-file), and
OpenClaw (ClawHub via openclaw skills install illo). Document lanes side by
side; never present one as the only path.
This guide is for anyone (human or agent) editing the repo. Keep it accurate when conventions change.
illo was extracted from tmchow/agent-skills
(June 2026, full history preserved). That repo keeps a frozen copy and must
keep serving its _assets/illo/ raw URLs — they are baked into
already-installed copies — but all development and publishing happen here.
Repo layout
The skill lives in skills/illo/, deliberately not at the repo root.
The top-level skills/ folder matches the layout convention of the
canonical skill repos (anthropics/skills, openai/skills,
vercel-labs/agent-skills) and keeps a future Claude Code plugin lane
possible (.claude-plugin/ + skills/). Installers copy the entire skill
directory verbatim, so the skill dir must contain only what every install
should ship; promoting SKILL.md to the root would make _assets/ and
repo meta ship with every install and blow the size budget. Note the
install identifiers do not carry the skills/ segment — skills.sh
indexes by skill name (tmchow/illo-skill/illo), the same way
openai/skills/skill-creator hides its skills/ folder.
skills/illo/SKILL.md— required. The agent-facing instructions.skills/illo/README.md— required. The human-facing landing page (below).skills/illo/references/— deep material loaded on demand, including the seventeen look definitions inreferences/styles/.skills/illo/scripts/— the engine (illo.py) and the Hermes asset-repair preflight.skills/illo/assets/— bundled binary assets pluschecksums.txt, a generated manifest (never edit by hand; see Binary assets below)._assets/illo/— docs-only images linked by raw URL (calibration examples, README embeds). They live outside the skill directory so they never ship with installs..github/— the ClawHub publish and asset-checksum workflows and their scripts.- Root
README.md— the repo landing page; rootLICENSE— MIT.
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.
- 1mo ago First seen · 368 lines · 4,931 tokens per session scan A 16799c8f6151
illo-skill AGENTS.md is an instructions file published in the GitHub repository tmchow/illo-skill (407 stars, last pushed 29d ago), licensed MIT. It adds 4,931 tokens to every session, about $0.0197 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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.