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 andisab/swe-marketplace --skill skill-devgit clone --depth 1 https://github.com/andisab/swe-marketplaceWrote 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/andisab/swe-marketplace/skill-dev)<a href="https://agentmods.dev/skills/andisab/swe-marketplace/skill-dev"><img src="https://agentmods.dev/badge/skills/andisab/swe-marketplace/skill-dev/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/andisab/swe-marketplace/skill-dev"><img src="https://agentmods.dev/badge/skills/andisab/swe-marketplace/skill-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.05516 |
| Opus 5.5 | $0.00034 | $0.02206 |
| Sonnet 5.5 | $0.00017 | $0.01103 |
| Haiku 4.5 | $0.00009 | $0.00552 |
Grade A, and why
skill-dev 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 — 819 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Dev Skill
This skill helps create production-ready Claude Code skills following Anthropic's official specifications and best practices.
Skills vs Agents: Key Differences
| Aspect | Skills | Sub-agents |
|---|---|---|
| Invocation | Model-invoked (automatic) | User-invoked (explicit) or Task tool |
| Scope | Single capability | Multiple capabilities |
| File | Directory with SKILL.md | Single .md file |
| Supporting files | Can include templates, scripts | System prompt only |
| Discovery | Description matching | Description + explicit invocation |
| Use case | Reusable patterns, tools, workflows | Specialized AI assistants |
When to use Skills: Create autonomous capabilities that Claude should invoke automatically when context matches (e.g., PDF processing, form filling, specific workflows)
When to use Agents: Create specialized AI assistants for complex domains requiring multi-step reasoning (e.g., database expert, security auditor)
Use Case Categories
Anthropic identifies three common skill categories:
| Category | Purpose | Example |
|---|---|---|
| Document & Asset Creation | Produce tangible outputs (reports, documents, designs, code) | A frontend-design skill that creates production-grade UI components |
| Workflow Automation | Orchestrate multi-step processes with validation gates | A skill-creator skill that walks users through use case definition, frontmatter, and validation |
| MCP Enhancement | Add knowledge and best practices on top of MCP tool access | A sentry-code-review skill that uses Sentry's MCP to analyze and fix bugs in PRs |
The kitchen analogy: MCP provides the professional kitchen (tools, ingredients, equipment). Skills provide the recipes (step-by-step instructions on how to create something valuable). Together, they enable users to accomplish complex tasks without figuring out every step themselves. See patterns/skill-mcp-integration.md for in-depth MCP integration guidance.
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 · 819 lines · 86 tokens per session scan A 8b1be5978a25
skill-dev is a skill published in the GitHub repository andisab/swe-marketplace (21 stars, last pushed 5d ago), licensed MIT. It adds 86 tokens to every session and 5,516 once invoked, about $0.0003 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 skills, from other repositories
ccc-tuneup
Audit and safely optimize the local Commander setup: version freshness, junk, count drift, superseded agents, hooks, settings keys, MCP staleness and cost settings. Read-only scan first; backs up, archives (never deletes) and asks before any fix. Use when the setup feels cluttered, stale or slow.
ccc-adopt
Merge Commander's orchestrator/executor section and a stack-tailored skill and agent list into an existing project's CLAUDE.md as a delimited, re-runnable block, with backup and diff approval first. Use when adopting Commander conventions in a repo you already have.
ccc-fable
Arm, check, audit or disarm the Fable Method: the PM loop, 12 checkable gates, workflow-first posture and verifier separation, persisted in Commander state. Use when the user says fable on/off/status/audit or wants verification-gated, orchestrated work.
ccc-codex
Manage the OpenAI Codex CLI: doctor, models, plugins, MCP servers, custom agents, cloud tasks, remote control, reviews, updates, import and config, backing up config first. Use when the user asks to check, set up or manage Codex.
ccc-deploy
Deploy the current build to Vercel, Fly.io, Cloudflare, GitHub Pages, npm, or a package deploy script, verify the live URL, and draft post-deploy notes. Use when a build is ready to go live or the user says deploy, push to production, or publish the package.
ccc-e2e
Pre-release assessment that fans out via $ccc-fleet into up to three isolated workers (QA audit, unit tests, Playwright E2E) running $ccc-testing lanes, then writes a severity-ranked PASS or FAIL verdict. Use when about to tag a release, after a large merge, or asking is this ready.