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 skills/dongduong2001/pudo-code-system/api-designnpx skills add DongDuong2001/pudo-code-system --skill api-designgit clone --depth 1 https://github.com/DongDuong2001/pudo-code-systemWrote 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/dongduong2001/pudo-code-system/api-design)<a href="https://agentmods.dev/skills/dongduong2001/pudo-code-system/api-design"><img src="https://agentmods.dev/badge/skills/dongduong2001/pudo-code-system/api-design.svg" alt="Measured on agentmods" 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 | $0.00014 | $0.00184 |
| Opus 5 | $0.00007 | $0.00092 |
| Sonnet 5 | $0.00003 | $0.00037 |
| Haiku 4.5 | $0.00001 | $0.00018 |
Grade A, and why
api-design-plan 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 4d 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
API Design Skill
This skill is utilized during the PLAN phase when defining the contract between different services or between a client and a backend.
When to use this skill
- When defining RESTful endpoints, GraphQL schemas, or gRPC definitions.
- When creating API documentation (OpenAPI/Swagger).
- When planning API versioning and deprecation strategies.
Guidelines
- Consistency: Maintain consistent naming conventions (e.g., standardizing on plural nouns for REST collections).
- Versioning: Plan for API versioning from Day 1 (e.g.,
/v1/users). - Pagination & Filtering: Design endpoints to handle large datasets natively.
- Security: Ensure authentication (OAuth2, JWT) and authorization (RBAC/ABAC) are built into the design.
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.
- 4d ago First seen · 20 lines · 14 tokens per session scan A b96b2a589ea2
api-design-plan is a skill published in the GitHub repository DongDuong2001/pudo-code-system (5 stars, last pushed 28d ago), licensed MIT. It adds 14 tokens to every session and 184 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 2026-08-31.
Other skills, from other repositories
scale-to-millions
Use this skill whenever the user is designing, reviewing, debugging, or answering interview questions about system/software architecture and scalability — e.g. "scale my app", "how do I handle more traffic", "design a URL shortener / news feed / chat system", "my API is slow under load", "should I shard my database"…
binary-analysis-patterns
Master binary analysis patterns including disassembly, decompilation, control flow analysis, and code pattern recognition. Use when analyzing executables, understanding compiled code, or performing static analysis on binaries.
conductor-implement
Execute tasks from a track's implementation plan following TDD workflow.
antigravity-skills-manager
Global skills manager for Google Antigravity. Explore, search, install, and manage 300+ agent skills from the rmyndharis/antigravity-skills catalog using pure stdlib CLI tools.
api-documenter
Master API documentation with OpenAPI 3.1, AI-powered tools, and modern developer experience practices. Create interactive docs, generate SDKs, and build comprehensive developer portals. Use PROACTIVELY for API documentation or developer portal creation.
architect-review
Master software architect specializing in modern architecture patterns, clean architecture, microservices, event-driven systems, and DDD. Reviews system designs and code changes for architectural integrity, scalability, and maintainability. Use PROACTIVELY for architectural decisions.