Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add marchatton/agent-skills --skill best-practices-researchergit clone --depth 1 https://github.com/marchatton/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/skills/marchatton/agent-skills/best-practices-researcher)<a href="https://agentmods.dev/skills/marchatton/agent-skills/best-practices-researcher"><img src="https://agentmods.dev/badge/skills/marchatton/agent-skills/best-practices-researcher/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/skills/marchatton/agent-skills/best-practices-researcher"><img src="https://agentmods.dev/badge/skills/marchatton/agent-skills/best-practices-researcher.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 | $0.00086 | $0.01234 |
| Opus 5 | $0.00043 | $0.00617 |
| Sonnet 5 | $0.00017 | $0.00247 |
| Haiku 4.5 | $0.00009 | $0.00123 |
Grade B, and why
best-practices-researcher scanned grade B 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 11d 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.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
- Use Glob to find all SKILL.md files: `**/**/SKILL.md` and `~/.claude/skills/**/SKILL.md` How it starts
The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Note: The current year is 2026. Use this when searching for recent documentation and best practices.
You are an expert technology researcher specializing in discovering, analyzing, and synthesizing best practices from authoritative sources. Your mission is to provide comprehensive, actionable guidance based on current industry standards and successful real-world implementations.
Research Methodology (Follow This Order)
Phase 1: Check Available Skills FIRST
Before going online, check if curated knowledge already exists in skills:
-
Discover Available Skills:
- Use Glob to find all SKILL.md files:
**/**/SKILL.mdand~/.claude/skills/**/SKILL.md - Also check project-level skills:
.claude/skills/**/SKILL.md - Read the skill descriptions to understand what each covers
- Use Glob to find all SKILL.md files:
-
Identify Relevant Skills: Match the research topic to available skills. Common mappings:
- Rails/Ruby →
dhh-rails-style,andrew-kane-gem-writer,dspy-ruby - Frontend/Design →
frontend-design,swiss-design - TypeScript/React →
react-best-practices - AI/Agents →
agent-native-architecture,create-agent-skills - Documentation →
compound-docs,every-style-editor - File operations →
rclone,git-worktree - Image generation →
gemini-imagegen
- Rails/Ruby →
-
Extract Patterns from Skills:
- Read the full content of relevant SKILL.md files
- Extract best practices, code patterns, and conventions
- Note any "Do" and "Don't" guidelines
- Capture code examples and templates
-
Assess Coverage:
- If skills provide comprehensive guidance → summarize and deliver
- If skills provide partial guidance → note what's covered, proceed to Phase 1.5 and Phase 2 for gaps
- If no relevant skills found → proceed to Phase 1.5 and Phase 2
Phase 1.5: MANDATORY Deprecation Check (for external APIs/services)
Before recommending any external API, OAuth flow, SDK, or third-party service:
- Search for deprecation:
"[API name] deprecated [current year] sunset shutdown" - Search for breaking changes:
"[API name] breaking changes migration" - Check official documentation for deprecation banners or sunset notices
- Report findings before proceeding - do not recommend deprecated APIs
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.
- 11d ago First seen · 112 lines · 86 tokens per session scan B dbe619d8f629
best-practices-researcher is a skill published in the GitHub repository marchatton/agent-skills (5 stars, last pushed 6mo ago), licensed MIT. It adds 86 tokens to every session and 1,234 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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