Borrowing it
Nothing to install: this file belongs to hoangsonww/PetSwipe-Match-App. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/hoangsonww/PetSwipe-Match-App/master/.agents/skills/backend-api-change/SKILL.mdgit clone --depth 1 https://github.com/hoangsonww/PetSwipe-Match-AppWrote 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/hoangsonww/petswipe-match-app/backend-api-change)<a href="https://agentmods.dev/skills/hoangsonww/petswipe-match-app/backend-api-change"><img src="https://agentmods.dev/badge/skills/hoangsonww/petswipe-match-app/backend-api-change/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/hoangsonww/petswipe-match-app/backend-api-change"><img src="https://agentmods.dev/badge/skills/hoangsonww/petswipe-match-app/backend-api-change.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 | $0.00049 | $0.00208 |
| Opus 5 | $0.00024 | $0.00104 |
| Sonnet 5 | $0.00010 | $0.00042 |
| Haiku 4.5 | $0.00005 | $0.00021 |
Grade A, and why
backend-api-change 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 10d 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
Use this skill for backend/API changes in PetSwipe.
Workflow
- Identify the route, controller, service, entity, and migration impact.
- Keep request and response behavior explicit.
- Check whether Swagger/OpenAPI exposure needs to change.
- Check whether health, readiness, or startup behavior is affected.
- Validate with build/tests appropriate to the touched area.
Repo-Specific Guidance
backend/src/app.tsis the central runtime and docs surface.- Health endpoints at
/healthand/readymatter for deployment. - Swagger is exposed at
/api-docs.jsonand/docs. - Route/controller/service/entity drift is a common source of regressions.
Read references/api-checklist.md before finishing.
What ships with it
2 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.
- 10d ago First seen · 24 lines · 49 tokens per session scan A 9b4d2e328464
backend-api-change is a skill published in the GitHub repository hoangsonww/PetSwipe-Match-App (25 stars, last pushed 2d ago), licensed MIT. It adds 49 tokens to every session and 208 once invoked, about $0.0002 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 2026-08-30.
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