skill-api-design

skill-api-design is a skill for Claude Code from saitarrun/Sdlc-ai-workflow. It costs 49 tokens per session (676 once invoked), scanned A, original, no licence file.

A skill for designing REST and gRPC APIs—the interfaces software uses to exchange requests and responses. It covers contracts, versions, errors, compatibility, rate limits, and OpenAPI specifications.

In plain words
What is it for?
Use it when planning an API, defining request and response formats, choosing versioning, or documenting an interface with OpenAPI.
Why use it?
It helps prevent inconsistent interfaces and breaking changes as an API evolves.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the sdlc-workflow plugin — 44 skills, 15 commands, 26 agents shipped together

Good fit Use it when planning an API, defining request and response formats, choosing versioning, or documenting an interface with OpenAPI.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/saitarrun/sdlc-ai-workflow/skill-api-design
Install

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.

Any agent
npx skills add saitarrun/Sdlc-ai-workflow --skill skill-api-design
Clone the repo
git clone --depth 1 https://github.com/saitarrun/Sdlc-ai-workflow

Made for: Claude Code.

Or install sdlc-workflow, the plugin that ships this one along with the rest of its 44 skills, 15 commands, 26 agents.

Wrote 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.

agentmods badge for skill-api-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/saitarrun/sdlc-ai-workflow/skill-api-design/github.svg)](https://agentmods.dev/skills/saitarrun/sdlc-ai-workflow/skill-api-design)
Your own site
<a href="https://agentmods.dev/skills/saitarrun/sdlc-ai-workflow/skill-api-design"><img src="https://agentmods.dev/badge/skills/saitarrun/sdlc-ai-workflow/skill-api-design/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.

agentmods 80×15 button for skill-api-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/saitarrun/sdlc-ai-workflow/skill-api-design"><img src="https://agentmods.dev/badge/skills/saitarrun/sdlc-ai-workflow/skill-api-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 676 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00049 $0.00676
Opus 5.5 $0.00020 $0.00270
Sonnet 5.5 $0.00010 $0.00135
Haiku 4.5 $0.00005 $0.00068

Measured 1mo ago against content hash 75a2fbf17a00, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skill-api-design 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 1mo 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.

skills/skill-api-design/SKILL.md · 114 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 1mo ago First seen · 114 lines · 49 tokens per session scan A 75a2fbf17a00

Subscribe to this mod's changes

skill-api-design is a skill published in the GitHub repository saitarrun/Sdlc-ai-workflow (5 stars, last pushed 1mo ago), with no licence file. It adds 49 tokens to every session and 676 once invoked, about $0.0002 per session on Opus 5.5. 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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