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 berkcangumusisik/claude-code-practices --skill rest-api-designgit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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/berkcangumusisik/claude-code-practices/rest-api-design)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/rest-api-design"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/rest-api-design/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/berkcangumusisik/claude-code-practices/rest-api-design"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/rest-api-design.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 | $0.00014 | $0.00325 |
| Opus 5 | $0.00007 | $0.00162 |
| Sonnet 5 | $0.00003 | $0.00065 |
| Haiku 4.5 | $0.00001 | $0.00032 |
Grade A, and why
rest-api-design 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 6d 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.
What it actually says
REST API Design
Resource / Scope: $ARGUMENTS
If reviewing existing API:
- Read route definitions:
grep -rn "router\.\|app\." src/ --include="*.ts" | grep -E "get|post|put|patch|delete" | head -30
Check for:
- Proper HTTP method usage (GET=read, POST=create, PUT/PATCH=update, DELETE=remove)
- Consistent URL naming (
/usersnot/getUsers) - Plural nouns for collections (
/users/123) - Nested resources for relationships (
/users/123/posts) - Query params for filtering/sorting/pagination, not URL segments
- Consistent response shapes
- Missing pagination on list endpoints
- HTTP status codes correct (201 for creation, 204 for delete, etc.)
If designing new API:
Generate the complete route table:
GET /resources List (with pagination)
POST /resources Create
GET /resources/:id Get one
PUT /resources/:id Replace
PATCH /resources/:id Partial update
DELETE /resources/:id Delete
GET /resources/:id/related Nested resource
Include request/response shapes and error codes for each endpoint.
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.
- 6d ago First seen · 47 lines · 14 tokens per session scan A 82230b105638
rest-api-design is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 14 tokens to every session and 325 once invoked, about $0.0001 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 2026-09-03.
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