Borrowing it
Nothing to install: this file belongs to timwukp/agent-skills-best-practice. 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/timwukp/agent-skills-best-practice/main/.kiro/steering/product.mdgit clone --depth 1 https://github.com/timwukp/agent-skills-best-practiceWrote 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/timwukp/agent-skills-best-practice/product)<a href="https://agentmods.dev/instructions/timwukp/agent-skills-best-practice/product"><img src="https://agentmods.dev/badge/instructions/timwukp/agent-skills-best-practice/product.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 | $0.00355 | $0.00355 |
| Opus 5 | $0.00178 | $0.00178 |
| Sonnet 5 | $0.00071 | $0.00071 |
| Haiku 4.5 | $0.00036 | $0.00036 |
Grade A, and why
agent-skills-best-practice product.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 yesterday.
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
Product Overview
This repository teaches AWS SAs and developers how to build agent skills — folders of instructions, scripts, and resources that AI agents (Kiro, Claude Code, Claude.ai) load dynamically to improve performance on specialized tasks.
It contains:
- Example skills in
skills/skills/: Apache 2.0 examples from Anthropic (skill-creator, mcp-builder, canvas-design, etc.) plus MIT-licensed software engineering workflow skills built for this repo (api-design, git-workflow, cicd-pipeline, terraform-module, and others). - A 6-hour workshop in
skills-workshop/with slides, exercises, labs, and test cases. - Tooling: a validation script used by CI, an install script for Kiro, and per-skill evals.
Skills here conform to the Agent Skills specification and are portable across Kiro, Claude Code, Claude.ai, and the Claude API. Anthropic's source-available document skills (docx, pdf, pptx, xlsx) are intentionally not included; this repo only carries open-source content.
Key Principles
- A skill is a self-contained folder whose
SKILL.mdhas YAML frontmatter (name,description) followed by instructions. - Descriptions drive activation: third person, what the skill does plus when to use it, with concrete trigger phrases.
- Progressive disclosure: keep
SKILL.mdunder 500 lines; push details intoreferences/, code intoscripts/. - Evaluation-first: engineering skills ship
evals/with task evals and should-trigger / should-not-trigger queries.
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.
- yesterday First seen · 23 lines · 355 tokens per session scan A 3ee509806362
agent-skills-best-practice product.md is an instructions file published in the GitHub repository timwukp/agent-skills-best-practice (10 stars, last pushed today), licensed MIT. It adds 355 tokens to every session, about $0.0018 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 2026-09-06.
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