Borrowing it
Nothing to install: this file belongs to hookdeck/agent-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/hookdeck/agent-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/hookdeck/agent-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/hookdeck/agent-skills/agents-md)<a href="https://agentmods.dev/instructions/hookdeck/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/hookdeck/agent-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/hookdeck/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/hookdeck/agent-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 | $0.05478 | $0.05478 |
| Opus 5.5 | $0.02191 | $0.02191 |
| Sonnet 5.5 | $0.01096 | $0.01096 |
| Haiku 4.5 | $0.00548 | $0.00548 |
Grade A, and why
agent-skills AGENTS.md scanned grade A with 1 finding 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 17d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
inspect/ # Inspect skill: free webhook test URLs (curl only, no examples) How it starts
The opening of the file, as written. The whole thing — 299 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Instructions for AI agents working on the Hookdeck Agent Skills repository.
Read this file before creating, modifying, or reviewing any skill in this repo.
hookdeck.com discovery index
Product skills under skills/event-gateway/, skills/hookdeck/, skills/inspect/, and skills/outpost/ are packaged at build time by the hookdeck/website repo and served from https://hookdeck.com/.well-known/agent-skills/ (RFC v0.2.0 discovery index + .tar.gz archives). When those paths change on main, .github/workflows/trigger-website-deploy.yml notifies Hookdeck, which triggers a Vercel production deploy of the site (same Hookdeck source as Outpost docs; both configured as Actions secrets: HOOKDECK_WEBSITE_DEPLOY_SOURCE_URL, VERCEL_WEBSITE_DEPLOY_HOOK_SOURCE_API_KEY). See website scripts/agent-skills-discovery.md for packaging details.
Specification
All skills MUST conform to the Agent Skills specification and follow the authoring best practices.
Hard constraints
- Every skill is a directory under
skills/containing aSKILL.mdfile SKILL.mdmust have YAML frontmatter withnameanddescriptionname: max 64 chars, lowercasea-z, numbers, and hyphens only. Must match the parent directory name exactly. No consecutive hyphens. Cannot start or end with a hyphen.description: max 1024 chars. Third person. Describes what the skill does AND when to use it with specific trigger phrases.- SKILL.md body: under 500 lines (< 5000 tokens). Move detailed content to
references/files. - File references: one level deep from SKILL.md only. SKILL.md links to reference files. Reference files may link to other reference files for workflow (e.g. 01→02→04) or "see also"; avoid long chains (A→B→C→D).
- Reference files over 100 lines: include a table of contents at the top.
- Progressive disclosure:
nameanddescriptionare loaded at startup for all skills. Full SKILL.md is loaded when the skill is activated. Reference files are loaded only on demand.
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.
- 17d ago Changed · +8 lines · +215 tokens per session 5bd7fe8db7bc
- 2mo ago First seen · 291 lines · 5,263 tokens per session scan A fa3a782f7b28
agent-skills AGENTS.md is an instructions file published in the GitHub repository hookdeck/agent-skills (5 stars, last pushed yesterday), licensed MIT. It adds 5,478 tokens to every session, about $0.0219 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
agent-skills AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| agent-skills AGENTS.mdhookdeck/agent-skills | Instructions file | 5 | yesterday | MIT | A | 5,478 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | 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 | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 275k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |