Cc Skills

Agent Skills

AI agent skills are reusable instruction sets that extend your assistant with domain-specific expertise, loaded on demand so they don't bloat your context. This repository covers marketing and engineering skills authored by @samber.

For Golang-related skills, please visit cc-skills-golang.

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[!IMPORTANT] Bootstrapped with Claude. Edited, tested, reviewed and reworked by a human.

No AI slop here. AI-made skills are useless.

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🚀 How to use?

Install with skills CLI (universal, works with any Agent Skills-compatible tool):

npx skills add https://github.com/samber/cc-skills --all
# or a single skill:
npx skills add https://github.com/samber/cc-skills --skill promql-cli

<!-- prettier-ignore-start --> <details> <summary>Claude Code</summary>

/plugin marketplace add samber/cc
/plugin install cc-skills@samber

</details> <details> <summary>Openclaw</summary>

Copy skills into the cross-client discovery directory:

git clone https://github.com/samber/cc-skills.git ~/.openclaw/skills/cc-skills
# or in workspace:
git clone https://github.com/samber/cc-skills.git ~/.openclaw/workspace/skills/cc-skills

</details> <details> <summary>Gemini CLI</summary>

gemini extensions install https://github.com/samber/cc-skills

Update with gemini extensions update cc-skills.

</details> <details> <summary>Cursor</summary>

Copy skills into the cross-client discovery directory:

git clone https://github.com/samber/cc-skills.git  ~/.cursor/skills/cc-skills

Cursor auto-discovers skills from .agents/skills/ and .cursor/skills/.

</details> <details> <summary>Copilot</summary>

Copy skills into the cross-client discovery directory:

/plugin install https://github.com/samber/cc-skills
# or
git clone https://github.com/samber/cc-skills.git ~/.copilot/skills/cc-skills

Copilot auto-discovers skills from .copilot/skills/.

</details> <details> <summary>OpenCode</summary>

Copy skills into the cross-client discovery directory:

git clone https://github.com/samber/cc-skills.git ~/.agents/skills/cc-skills

OpenCode auto-discovers skills from .agents/skills/, .opencode/skills/, and .claude/skills/.

</details> <details> <summary>Codex (OpenAI)</summary>

Install the plugin via the Codex CLI:

codex plugin add github:samber/cc-skills

Update with codex plugin update cc-skills. Falls back to a manual clone if the marketplace path is unavailable:

git clone https://github.com/samber/cc-skills.git ~/.agents/skills/cc-skills

Codex auto-discovers skills from ~/.agents/skills/ and .agents/skills/.

</details> <details> <summary>Antigravity</summary>

Clone and symlink into the cross-client discovery path:

git clone https://github.com/samber/cc-skills.git ~/.antigravity/skills/cc-skills

Update with cd ~/.antigravity/skills/cc-skills && git pull.

</details> <!-- prettier-ignore-end -->

🧩 Skills

These skills are designed as atomic units, cross-referencing units. A skill may reference conventions defined in another. Installing only a subset will give you a partial and potentially inconsistent view of the guidelines. For best results, install all general-purpose skills together.

Each skill lives in skills/<name>/ with a SKILL.md entry point. The SKILL.md is kept small with internal references to advanced markdown files, so only the relevant content is loaded into context.

• Description (tok): weight of the description field from YAML frontmatter, always loaded into Claude's context for skill triggering
• SKILL.md (tok): weight of the full SKILL.md file loaded when the skill triggers
• Directory (tok): weight of all files in the skill directory (SKILL.md + referenced markdown files)

                     ┌──────────────┐
                     │ Agent Skills │
                     └───────┬──────┘
                             │
          ┌──────────────────┴──────────┐
          │                             │
          ▼                             ▼
┌────────────────────────┐  ┌──────────────────────────────────────┐
│      Engineering       │  │         Marketing & Content          │
├────────────────────────┤  ├──────────────────────────────────────┤
│ conventional-git       │  │ linkedin-ghostwriting                │
│ promql-cli             │  │ press-release-writer                 │
│ chrome-extension       │  │ humaniseur-fr                        │
│ crxjs                  │  │ humanizer-en-asd-ste100              │
│ site-launch-checklist  │  │ copywriting-hooks                    │
│ frontend-design-deslop │  │ copywriting-cta                      │
│                        │  │ copywriting-prose-creator            │
│                        │  │ copywriting-tone-of-voice-creator    │
└────────────────────────┘  └──────────────────────────────────────┘

┌──────────────────────────┐  ┌───────────────────────────┐  ┌─────────────────────────────────────┐
│   Developer Relations    │  │       Productivity        │  │                Meta                 │
├──────────────────────────┤  ├───────────────────────────┤  ├─────────────────────────────────────┤
│ technical-article-writer │  │ deep-research             │  │ snyk-agent-scan-compliance          │
│ substack-ghostwriting    │  │ influence-and-negotiation │  │ skill-progressive-disclosure-design │
│                          │  │ training-report           │  │                                     │
└──────────────────────────┘  └───────────────────────────┘  └─────────────────────────────────────┘

Skill	Error rate gap	Description (tok)	SKILL.md (tok)	Directory (tok)
conventional-git	-36%	73	1,446	1,446
promql-cli	-39%	87	1,257	6,248
chrome-extension	—	137	3,909	36,173
crxjs	—	185	2,697	2,697
site-launch-checklist	-59%	198	7,784	17,896
frontend-design-deslop	-28%	168	4,294	45,097
linkedin-ghostwriting	-31%	87	1,045	1,993
substack-ghostwriting	-51%	154	3,416	10,821
technical-article-writer	-33%	157	2,809	6,251
press-release-writer	-34%	159	1,686	17,981
humaniseur-fr	-14%	166	10,782	10,782
humanizer-en-asd-ste100	-16%	141	9,594	9,594
snyk-agent-scan-compliance	-27%	144	1,904	5,612
training-report	-61%	179	2,392	8,222
deep-research	-51%	316	2,997	14,125
influence-and-negotiation	-68%	162	6,592	48,996
skill-progressive-disclosure-design	-58%	154	3,607	3,607
copywriting-hooks	—	169	6,705	13,484
copywriting-cta	—	165	2,873	14,424
copywriting-prose-creator	—	166	4,952	24,900
copywriting-tone-of-voice-creator	—	181	4,056	22,315

🧪 Skill evaluations

	With Skill	Without Skill	Delta
Overall	98%	52%	+46pp

See EVALUATIONS.md for the full per-skill breakdown.

📖 Skills description

Engineering

chrome-extension

Chrome Extension development with Manifest V3. Covers architecture, messaging, CSP, storage, permissions, content scripts, service workers, and Chrome Web Store publishing.

conventional-git

Conventional Commits v1.0.0 for branch naming, worktree naming, and commit messages. Keeps git history parseable for auto-changelogs, SemVer bumps, and issue closing.

crxjs

CRXJS Chrome extension development with Vite. True HMR for popup/options/content scripts/side panels, defineManifest for type-safe manifests, dynamic content script imports.

frontend-design-deslop

Strategy-first UI design for web frontends, apps, dashboards, and landing pages. Escapes AI-generated generic aesthetics (Inter + indigo + rounded cards) by committing to brand adjectives, then deriving a typography and color system, component state matrices, layout rhythm, motion, iconography, and dark mode. Produces a DESIGN.md design token contract.

promql-cli

CLI for querying Prometheus and PromQL-compatible engines (Thanos, Cortex, VictoriaMetrics, Mimir). Instant/range queries, metric discovery, table/csv/json/graph output.

Marketing & Content

copywriting-cta

End-of-article CTA design. Interviews for objective, audience, and context, then produces copy + visual form + mechanism + A/B test plan + accessibility check.

copywriting-hooks

Opening hooks for long-form articles (blog posts, Substack, LinkedIn long-form, newsletters). Proposes 3-4 hooks with distinct psychological levers: curiosity, contrarian, scene, promise, authority.

copywriting-prose-creator

Codifies prose mechanics (lexicon, syntax, rhythm, structure) into a PROSE.md style guide. Three modes: BUILD fresh, ADAPT to new channel, AUDIT a corpus. For content factories, ghostwriting teams, house style guides.

copywriting-tone-of-voice-creator

Builds brand tone of voice guides (TONE.md) with voice attributes, modulation matrix, lexicon, and channel rules. Create from scratch or adapt to a new channel. For B2B, B2C, NGO, public sector, personal brands.

humaniseur-fr

Removes AI-writing patterns from French text. Detects and fixes 27 patterns: AI vocabulary, anglicisms, formulaic openings, em dash abuse, sycophantic tone, typographic tells.

humanizer-en-asd-ste100

Rewrites English into ASD-STE100 Simplified Technical English (Issue 9) and de-slops technical documentation — decorative emojis, conversation leftovers, Markdown residue, mixed quote styles. Enforces the 53 rules across 9 sections — approved word meanings, technical noun/verb categories, sentence-length limits, banned verb tenses, passive-voice restrictions — for maintenance manuals, equipment procedures, and any technical text read by non-native speakers or machine translation.

linkedin-ghostwriting

B2B LinkedIn ghostwriting via strategic interview, hook engineering, and post body. Turns founder stories and results into conversion-focused posts.

press-release-writer

Professional press releases for any occasion and region. Product launches, funding, partnerships, crisis, M&A, events. Region-specific conventions (Europe, Americas, Asia, etc.).

site-launch-checklist

Pre-launch checklist for shipping a website. Analytics (GA4, PostHog, GSC), legal, security headers, SEO/GEO, copywriting pass, OpenGraph, favicons, Lighthouse, accessibility. Opinionated for Cloudflare + Vercel.

Developer Relations

substack-ghostwriting

Write, optimize, and grow Substack newsletters and articles. Covers topic selection, headline optimization, SEO, and audience building.

technical-article-writer

Technical articles and blog posts for senior developers. Opinionated, practical, example-driven content that teaches something or saves time.

Productivity

deep-research

Deep research with parallel web searches, multi-source validation, and cited Markdown reports. 11 research types: market, competitive, technical, academic, financial, legal, trend, community, and more.

influence-and-negotiation

Negotiation and influence toolkit for any interaction requiring agreement. B2B sales, salary, collective bargaining, hard 1:1s, recruitment, cross-cultural deals. Preparation, live coaching, and diplomatic drafting.

training-report

Generates structured training reports from session data. Tracks progress, skills acquired, and outcomes.

Meta

skill-progressive-disclosure-design

Design patterns for skill progressive disclosure. Structures skill content for lazy loading so only relevant sections enter context.

snyk-agent-scan-compliance

Compliance expert for snyk-agent-scan. Validates security scan configurations and ensures compliance with organizational policies.

🎯 Tuning Skill Triggers

If a skill triggers too often or not often enough, please open an issue suggesting a description change. The description field in SKILL.md frontmatter is the primary triggering mechanism: small wording adjustments can significantly improve trigger accuracy. Some SKILL.md might have a When to use section which is another level of exclusion. Finally, SKILL.md is an entrypoint for lazy loading references with deep knowledge located in references/.

🔄 Overlap

If your team has its own conventions, create a company skill and declare the override explicitly near the top of its body: This skill supersedes samber/cc-skills@git-convention skill for [company] projects.

✍️ Contribute

• 100 tokens per skill description - what? when to use this skill?
• 1.000–2.500 tokens per SKILL.md — keep the main file focused on essentials
• Use secondary markdown files for depth — reference them from SKILL.md with relative links (e.g., [Logging](./logging.md)). Claude reads these on demand when the topic is relevant, so they don't count against the context budget until needed
• Up to 10.000 tokens for full skill and secondary files
• 2–4 skills loaded simultaneously in a typical session — design skills to coexist
• Stay below ~10k tokens of total loaded SKILL.md anytime to avoid degrading response quality

For more guidelines, please check CLAUDE.md.

💫 Fuel the Revolution

• ⭐️ Star this repo - Your star powers the caffeine engine!
• ☕️ Buy me a coffee - I'll literally use it to build more skills while drinking actual coffee

📝 License

Copyright © 2026 Samuel Berthe.

This project is under MIT license.