rc-openapi

rc-openapi is a skill for Claude Code, Codex from rodolfochicone/rc-project. It costs 76 tokens per session (1,110 once invoked), scanned A, original, MIT.

A tool for creating or updating an OpenAPI document, a machine-readable description of an HTTP API, from the project's source code.

In plain words
What is it for?
Use it to generate or maintain an openapi.yaml file after API changes or for an existing service.
Why use it?
It keeps API documentation aligned with the routes, inputs, and outputs that actually exist in the service.

Skill for Claude CodeCodex

Part of the rc plugin — 32 skills, 2 commands, 4 agents, 5 hooks shipped together

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.

agentmods
npx agentmods add skills/rodolfochicone/rc-project/rc-openapi
Any agent
npx skills add rodolfochicone/rc-project --skill rc-openapi
Clone the repo
git clone --depth 1 https://github.com/rodolfochicone/rc-project

Made for: Claude Code, Codex.

Or install rc, the plugin that ships this one along with the rest of its 32 skills, 2 commands, 4 agents, 5 hooks.

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 rc-openapi

README.md
[![agentmods](https://agentmods.dev/badge/skills/rodolfochicone/rc-project/rc-openapi.svg)](https://agentmods.dev/skills/rodolfochicone/rc-project/rc-openapi)
Your own site
<a href="https://agentmods.dev/skills/rodolfochicone/rc-project/rc-openapi"><img src="https://agentmods.dev/badge/skills/rodolfochicone/rc-project/rc-openapi.svg" alt="Measured on agentmods" height="20"></a>
Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,110 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00076 $0.01110
Opus 5 $0.00038 $0.00555
Sonnet 5 $0.00015 $0.00222
Haiku 4.5 $0.00008 $0.00111

Measured 4d ago against content hash 4b4cd00ef210, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rc-openapi 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.

skills/misc/rc-openapi/SKILL.md · 51 lines

How it starts

The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenAPI Specification

Generate or maintain an OpenAPI document that mirrors the API's real routes, request contracts, and response models. Document only what exists in source. This skill is standalone and stack-agnostic; it detects how the project defines HTTP endpoints. It only writes the spec file — it never modifies source code.

Required Inputs

  • None. Operates on the current repository.
  • Optional: the spec output path (default .techdocs/docs/openapi.yaml, or the existing location if one is found) and the target OpenAPI version.

Workflow

  1. Locate the spec and pick the version.

    • Search for an existing openapi.yaml/openapi.json (.techdocs/docs/, docs/, repo root). If found, read it for comparison and reuse its output path and version. Otherwise default the output to .techdocs/docs/openapi.yaml, creating the directory if needed.
    • For a new spec, default to OpenAPI 3.1.0. Use 3.0.3 only if the project's tooling (gateway, codegen, docs renderer) pins it — note the choice in the report.
  2. Discover HTTP endpoints from source. Detect the routing mechanism and enumerate every endpoint with method, full path, handler reference, and any summary/description from doc comments or manifest annotations. Routing may live in framework routers (Express, Gin, Spring, FastAPI, etc.) or infrastructure manifests (serverless.yml http events, API Gateway). Ignore non-HTTP triggers.

  3. Extract request contracts from each handler's validation layer: path params, query params, body fields, and required headers — with type, required/optional, defaults, nullability, constraints (uuid, min/max, datetime, enum), and any custom validation messages. Read from the real schema/DTO (Zod, Pydantic, Go structs, class-validator, etc.).

  4. Extract response models. For each endpoint determine the success and error responses from the handler's return shape and the domain entities it serializes — including field renames the handler applies — and the HTTP status codes it can emit (2xx success, 4xx validation/not-found/conflict, etc.).

Read the full file on GitHub · 51 lines

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. 4d ago First seen · 51 lines · 76 tokens per session scan A 4b4cd00ef210

Subscribe to this mod's changes

rc-openapi is a skill published in the GitHub repository rodolfochicone/rc-project (19 stars, last pushed 28d ago), licensed MIT. It adds 76 tokens to every session and 1,110 once invoked, about $0.0004 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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