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 keodubo/PAW-Wiki --skill paw-service-contracts-layergit clone --depth 1 https://github.com/keodubo/PAW-WikiWrote 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/keodubo/paw-wiki/paw-service-contracts-layer)<a href="https://agentmods.dev/skills/keodubo/paw-wiki/paw-service-contracts-layer"><img src="https://agentmods.dev/badge/skills/keodubo/paw-wiki/paw-service-contracts-layer/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/keodubo/paw-wiki/paw-service-contracts-layer"><img src="https://agentmods.dev/badge/skills/keodubo/paw-wiki/paw-service-contracts-layer.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 | $0.00054 | $0.00506 |
| Opus 5 | $0.00027 | $0.00253 |
| Sonnet 5 | $0.00011 | $0.00101 |
| Haiku 4.5 | $0.00005 | $0.00051 |
Grade A, and why
paw-service-contracts-layer 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 12d 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 — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Paw Service Contracts Layer
Overview
Use this for service-contracts/, the public API between webapp and services.
Read references/layer-rules.md before changing service contracts.
Workflow
- Inspect existing service interfaces, DTOs, and exceptions in
service-contracts/src/main/java/ar/edu/itba/paw/services. - Resolve stage: TP1 contracts serve MVC/JSP flows; TP2 should preserve business use cases while persistence changes; TP final may need DTO/API boundaries.
- Design the service method as a use-case boundary, not as a direct DAO wrapper.
- Create command/data objects when passing many related values from webapp to services.
- Put domain exceptions here when webapp advice or REST resources must map them to HTTP status or inline/API errors.
- In TP final, separate service command DTOs/use-case data from API representation DTOs unless the repo already chose otherwise.
- Keep contracts independent from JSP paths, servlet types, Spring MVC forms, JAX-RS
Response/UriInfo/Link, media types, Problem Details payloads, CORS/cache headers, JDBC/JPA classes, frontend state, and implementation details. - Migrate implementations, tests, and callers in the same slice when changing existing contracts.
Contract Rules
- Services own business use cases; DAOs own storage mechanics.
- DTOs such as
SaveRestaurantData,CreateReservationData, andChangePasswordDatamake controllers thinner. - Exceptions should be specific enough for
ErrorHandlingAdviceand tests to assert behavior without string parsing. - API resources map service results/exceptions to HTTP DTO/status/header contracts; service contracts do not return HTTP responses or frontend route state.
- Do not split interface contracts around async implementation details such as
MailServicevsAsyncMailService. - Keep locale-sensitive mail contracts explicit about recipient locale.
Verification
- Contract-only compile:
mvn -pl service-contracts -am test. - Contract plus implementation:
mvn -pl services -am test. - Contract used from web forms/controllers:
mvn -pl webapp -am test.
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.
- 12d ago First seen · 39 lines · 54 tokens per session scan A 938dee98807d
paw-service-contracts-layer is a skill published in the GitHub repository keodubo/PAW-Wiki (10 stars, last pushed 1mo ago), licensed MIT. It adds 54 tokens to every session and 506 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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