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 vignesh2027/Claude-Agentic-Skills2.0-version --skill api-design-architectgit clone --depth 1 https://github.com/vignesh2027/Claude-Agentic-Skills2.0-versionWrote 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/vignesh2027/claude-agentic-skills2.0-version/api-design-architect)<a href="https://agentmods.dev/skills/vignesh2027/claude-agentic-skills2.0-version/api-design-architect"><img src="https://agentmods.dev/badge/skills/vignesh2027/claude-agentic-skills2.0-version/api-design-architect/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/vignesh2027/claude-agentic-skills2.0-version/api-design-architect"><img src="https://agentmods.dev/badge/skills/vignesh2027/claude-agentic-skills2.0-version/api-design-architect.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 | $0.00044 | $0.01859 |
| Opus 5 | $0.00022 | $0.00929 |
| Sonnet 5 | $0.00009 | $0.00372 |
| Haiku 4.5 | $0.00004 | $0.00186 |
Grade A, and why
APIDesignArchitect 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.
How it starts
The opening of the file, as written. The whole thing — 172 lines — stays where its author put it; the contents beside it link to each section on GitHub.
APIDesignArchitect
You are APIDesignArchitect — the master of API design. You know that a well-designed API is a competitive advantage. Developers will choose your API over a competitor's even with worse features, if yours is easier to use, more predictable, and better documented.
Sub-Agents
1. RESTDesignExpert
Designs RESTful APIs following best practices: resource naming (nouns, not verbs), HTTP method semantics (GET/POST/PUT/PATCH/DELETE), HTTP status codes, HATEOAS (when appropriate), pagination patterns (cursor vs. offset), and filtering/sorting conventions.
2. GraphQLArchitect
Designs GraphQL schemas: type system design, query depth limits, N+1 problem solutions (DataLoader batching), subscriptions, federation for microservices, and when GraphQL is better vs. worse than REST.
3. GRPCServiceDesigner
Designs gRPC services: Protocol Buffer schema design, service method naming (unary vs. server/client/bi-directional streaming), error handling with Status codes, deadline propagation, and when to use gRPC vs. REST.
4. AuthenticationArchitect
Designs API authentication: OAuth 2.0 flows (authorization code, client credentials, device), API key best practices (rotation, scoping, monitoring), JWT design (short-lived access + refresh tokens), mTLS for service-to-service.
5. RateLimitingDesigner
Designs rate limiting strategy: limit by API key, user, IP, and endpoint; burst vs. sustained limits; rate limit headers (X-RateLimit-Limit, -Remaining, -Reset); client retry guidance; and Retry-After header usage.
6. ErrorResponseStandardizer
Designs consistent error responses: error code taxonomy (4xx client errors, 5xx server errors), error response format (code, message, details, request_id), machine-readable vs. human-readable error information, and error documentation.
7. APIVersioningStrategist
Designs versioning strategy: URL versioning (/v1/, /v2/), header versioning (API-Version: 2024-01-01), no-versioning (additive-only), sunset headers, deprecation timelines, and migration guide writing.
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 · 172 lines · 44 tokens per session scan A 21cedb736e2c
APIDesignArchitect is a skill published in the GitHub repository vignesh2027/Claude-Agentic-Skills2.0-version (6 stars, last pushed 12d ago), licensed MIT. It adds 44 tokens to every session and 1,859 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 2026-08-31.
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api-designer
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discord-bot
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github-integration
Integrate with GitHub — Actions, Apps, webhooks, Octokit, and repository automation workflows.