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 agentmods add skills/a2ngerer/claude_onboarding_agent/web-development-setupnpx skills add a2ngerer/claude_onboarding_agent --skill web-development-setupgit clone --depth 1 https://github.com/a2ngerer/claude_onboarding_agentWrote 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/a2ngerer/claude_onboarding_agent/web-development-setup)<a href="https://agentmods.dev/skills/a2ngerer/claude_onboarding_agent/web-development-setup"><img src="https://agentmods.dev/badge/skills/a2ngerer/claude_onboarding_agent/web-development-setup.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 | $0.00051 | $0.06252 |
| Opus 5 | $0.00026 | $0.03126 |
| Sonnet 5 | $0.00010 | $0.01250 |
| Haiku 4.5 | $0.00005 | $0.00625 |
Grade A, and why
web-development-setup 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 5d 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 — 403 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Development Setup
This skill configures Claude for web application development — frontend SPAs, backend APIs, full-stack apps, and static sites. It is the right choice when the project centers on a JS/TS framework (Next.js, React, Vue, Svelte, SolidJS, Astro, Remix) or a web-backend stack (Node, Bun, Python FastAPI/Django, Go) serving HTTP traffic.
Use coding-setup for language-agnostic software projects (libraries, CLIs, generic services). Use design-setup for UI/UX design tooling (Figma, design systems) rather than application code.
Handoff context: Read skills/_shared/consume-handoff.md and run it with the handoff block (if any). The helper guarantees the following locals: detected_language, existing_claude_md, inferred_use_case, repo_signals, graphify_candidate. Use detected_language for all user-facing prose; generated file content stays in English.
Existing CLAUDE.md: If existing_claude_md: true, DO NOT overwrite it. Append a new delimited section at the end of the file:
<!-- onboarding-agent:start setup=web-development skill=web-development-setup section=claude-md -->
## Claude Onboarding Agent — Web Development Setup
...generated content...
<!-- onboarding-agent:end -->
If the delimited block already exists from a previous run (either the attributed form above or the legacy unattributed <!-- onboarding-agent:start --> form), replace only the content between the markers; leave the rest of the file untouched. Upgrade the opening marker to the attributed form while you are there — /upgrade-setup depends on it for detection.
Supporting Files
Read these on-demand at the step that invokes them. Do not read eagerly.
rule-file-templates.md— bodies of the.claude/rules/*.mdfiles (Step 8)framework-defaults.md— Q1/Q2-conditional styling and deploy-target matrix (Step 4), plus public env-var prefix tablegitignore-block.md— the.gitignoreblock and.env.examplescaffold (Step 8)document-skeletons.md—package.json,pyproject.toml, and per-stack install commands (Step 8)type-check-hook.template.sh— bash source for the optional type-check PostToolUse hook, with<PM_EXEC>placeholder (Step 8)skills/_shared/consume-handoff.md— orchestrator handoff parse + inline fallback (preamble, before Step 1)skills/_shared/offer-superpowers.md— canonical Superpowers opt-in (Step 1)skills/_shared/offer-github-mcp.md— canonical GitHub MCP offer (Step 7)skills/_shared/offer-graphify.md— canonical Graphify opt-in (Step 9)
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 403 lines · 51 tokens per session scan A 2c2a8563949a
web-development-setup is a skill published in the GitHub repository a2ngerer/claude_onboarding_agent (5 stars, last pushed yesterday), licensed MIT. It adds 51 tokens to every session and 6,252 once invoked, about $0.0003 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 2026-08-31.
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