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 parisgroup-ai/imersao-ia-setup --skill api-designgit clone --depth 1 https://github.com/parisgroup-ai/imersao-ia-setupWrote 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/parisgroup-ai/imersao-ia-setup/api-design)<a href="https://agentmods.dev/skills/parisgroup-ai/imersao-ia-setup/api-design"><img src="https://agentmods.dev/badge/skills/parisgroup-ai/imersao-ia-setup/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/parisgroup-ai/imersao-ia-setup/api-design"><img src="https://agentmods.dev/badge/skills/parisgroup-ai/imersao-ia-setup/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 | $0.00062 | $0.00666 |
| Opus 5 | $0.00031 | $0.00333 |
| Sonnet 5 | $0.00012 | $0.00133 |
| Haiku 4.5 | $0.00006 | $0.00067 |
Grade A, and why
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 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.
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 — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Design Skill
This skill ensures every API is consistent, well-documented, and follows industry best practices.
URL Structure
/api/v1/{resource} # Collection
/api/v1/{resource}/{id} # Single item
/api/v1/{resource}/{id}/{sub-resource} # Nested resource
Rules:
- Use plural nouns:
/users,/orders,/products - Use kebab-case for multi-word:
/order-items - Max 2 levels of nesting
HTTP Methods
| Method | Purpose | Idempotent | Safe |
|---|---|---|---|
| GET | Retrieve | Yes | Yes |
| POST | Create | No | No |
| PUT | Replace | Yes | No |
| PATCH | Update | Yes | No |
| DELETE | Remove | Yes | No |
Response Format
Success
{
"data": { },
"meta": {
"requestId": "req_xyz789",
"timestamp": "2024-01-15T10:30:00Z"
}
}
Error
{
"error": {
"code": "VALIDATION_ERROR",
"message": "Invalid input data",
"details": [
{ "field": "email", "message": "Must be valid email" }
]
},
"meta": { "requestId": "req_xyz789" }
}
Status Codes
| Code | When to Use |
|---|---|
| 200 | Successful GET, PUT, PATCH |
| 201 | Successful POST (created) |
| 204 | Successful DELETE |
| 400 | Bad request |
| 401 | Not authenticated |
| 403 | Not authorized |
| 404 | Not found |
| 409 | Conflict |
| 422 | Validation failed |
| 429 | Rate limited |
| 500 | Server error |
Pagination
{
"data": [...],
"pagination": {
"page": 1,
"perPage": 20,
"total": 150,
"totalPages": 8,
"hasNext": true,
"hasPrev": false
}
}
Filtering & Sorting
GET /api/v1/users?status=active&sort=-createdAt&fields=id,name
Checklist
- URLs use plural nouns and kebab-case
- Correct HTTP methods for each operation
- Consistent response envelope
- Proper status codes
- Pagination on all list endpoints
- Validation with detailed errors
- Rate limiting headers
- OpenAPI documentation
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 · 62 tokens per session scan A b6fec8849d6c
api-design is a skill published in the GitHub repository parisgroup-ai/imersao-ia-setup (1 stars, last pushed 29d ago), licensed MIT. It adds 62 tokens to every session and 666 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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