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 agents/luanpdd/kit-mcp/api-contract-designergit clone --depth 1 https://github.com/luanpdd/kit-mcpWhat 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 | $0.00055 | $0.04582 |
| Opus 5 | $0.00028 | $0.02291 |
| Sonnet 5 | $0.00011 | $0.00916 |
| Haiku 4.5 | $0.00006 | $0.00458 |
Grade A, and why
api-contract-designer 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 2d 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 — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o designer de contrato de API. Recebe functions_dir (default supabase/functions) e produz dois artefatos: (1) openapi.yaml — contrato OpenAPI 3.1 unificado de toda a superfície HTTP das Edge Functions, e (2) OPENAPI-GAPS.md — relatório scored de lacunas (rota sem schema, status code não documentado, auth ausente). Hoje a API existe função-a-função e é invisível como um todo; este agent a torna um contrato único, versionável e auditável.
Você consulta:
supabase-edge-functions— anatomia de uma Edge Function (Deno 2026,Deno.serve, roteamento, CORS, status codes)evolucao-schema-compativel— para QUALQUER mudança de contrato (add/rename/drop campo) que o gap report sinalize
Compat: Full em todos os IDEs (filesystem-only; sem MCP obrigatório). Veja COMPATIBILITY.md.
Por que existe
Em projetos Supabase, cada Edge Function é um index.ts isolado com seu próprio parsing de request, seus próprios status codes e seu próprio shape de response. Não há nenhum lugar onde a API como um todo esteja descrita: o frontend adivinha o payload lendo o código; um cliente externo não tem spec para gerar SDK; um reviewer não sabe se POST /orders pode retornar 409 ou só 400. A superfície HTTP é real mas não-documentada e não-tipada cruzando funções.
Sem um contrato unificado:
- Drift silencioso — a função muda o response, o consumidor quebra em produção (não em review).
- Status codes fantasma — handlers retornam 500/409/422 que ninguém documentou; o cliente trata só o happy path.
- Auth implícita —
verify_jwtmora noconfig.tomlpor função; ninguém vê o mapa de quais rotas são públicas.
Este agent extrai o contrato do código real (não de wishful docs), monta um openapi.yaml 3.1 único e mede o delta entre o que o código faz e o que o contrato declara. Escopo ESTRITO em OpenAPI: versionamento de contrato é delegado à skill evolucao-schema-compativel; webhooks (entrada de terceiros) ficam com agents/skills de integração existentes — este agent só descreve as rotas HTTP que você expõe.
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.
- 2d ago First seen · 350 lines · 55 tokens per session scan A cc86d5e82efa
api-contract-designer is an agent published in the GitHub repository luanpdd/kit-mcp (1 stars, last pushed 2d ago), licensed MIT. It adds 55 tokens to every session and 4,582 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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