# openapi

This skill shows how Vovk.ts derives an OpenAPI spec from procedures and validation schemas. Use it to document API operations and configure a docs UI such as Scalar.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · ★ 57
- Author: finom
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/finom/vovk/tree/HEAD/skills/openapi/SKILL.md
- Updated: 2026-10-22
- HTML: https://affpapa.org/en/nevibecode/skills/finom-openapi

## What it does

The skill explains how Vovk.ts maps procedure fields to OpenAPI parameters, request bodies, and responses. Add operation metadata with `@operation`; `@operation.error` describes expected errors, while shared API details belong in `vovk.config.mjs`. Segments can have their own configuration.

You can access the spec from code and serve its JSON through a controller. The docs section covers Scalar, with Redoc and Swagger UI as alternatives. One constraint matters: a procedure without `@operation`, `@operation.tool`, or `@operation.error` is excluded from the spec, so each operation you want documented needs a decorator.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add finom/vovk --skill openapi -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/openapi/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/openapi/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add finom/vovk --skill openapi -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/openapi/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add finom/vovk --skill openapi -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/openapi/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install finom/vovk openapi
```

2. **Manually: put the files in place**
- File: `.github/skills/openapi/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add finom/vovk --skill openapi -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/finom/vovk --path skills/openapi
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/openapi/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add finom/vovk --skill openapi -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/finom/vovk/tree/HEAD/skills/openapi/SKILL.md

## When to use it
- generate an OpenAPI spec from procedures and validation schemas
- set shared API details and server URLs
- document expected endpoint errors
- configure separate specs for API segments
- serve the spec as JSON for a documentation page

## Example prompts
- Configure OpenAPI generation for my Vovk.ts procedures and add metadata to the operations that should appear.
- Show me how to document endpoint errors with `@operation.error`.
- Set up a separate OpenAPI spec for the `admin` segment.

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: c906239aa21bb16c.

BEGIN THIRD-PARTY FILE c906239aa21bb16c
````text
---
name: openapi
description: Vovk.ts OpenAPI generation — how the OpenAPI 3.x spec is derived from procedures + validation schemas, the `@operation` decorator family (`@operation({...})` for summary/description/tags/security/deprecated, `@operation.error(status, message)` for error responses, `@operation.tool({...})` for AI tool metadata), top-level `outputConfig.openAPIObject` configuration (info, servers, license, tags, security, components), per-segment overrides, accessing the spec from code (`@/client/openapi`), serving the spec JSON from a controller, and rendering it with **Scalar** (the primary / recommended docs UI — picks up the TypeScript / Python / Rust code samples that Vovk generates via `x-codeSamples`) or alternatives like Redoc / Swagger UI. Use whenever the user asks for "API docs", "Scalar docs", "Swagger", "OpenAPI spec", "document my API", "generate OpenAPI from my controllers", "add an info/title/servers block", "segment-specific docs", "expose OpenAPI at /api/docs", "bearer auth in the spec", "document possible errors", "deprecate an endpoint". Does NOT cover procedure authoring → hand off to `procedure` skill. Does NOT cover AI tool derivation via `deriveTools` → hand off to `tools` skill (though `@operation.tool` is mentioned here since it's part of the decorator family). Does NOT cover third-party OpenAPI imports → hand off to `mixins` skill.
---

# Vovk.ts OpenAPI

OpenAPI 3.x spec is byproduct of code you already write. Procedures + validation schemas + `@operation` metadata → spec. No separate doc authoring.

## How procedures map to OpenAPI

| Procedure field | OpenAPI output |
|---|---|
| `params` schema | `parameters` with `in: 'path'` |
| `query` schema | `parameters` with `in: 'query'` |
| `body` schema | `requestBody` (content type from `contentType`, default `application/json`) |
| `output` schema | `responses.200` with `application/json`; other statuses via `@operation({ responses: { 201: … } })`, merged over it |
| `iteration` schema | `responses.200` with `application/jsonl` |
| `@operation` fields | operation-level metadata (`summary`, `description`, `tags`, etc.) |

Anything expressible in `procedure()` call — request shape, response shape, content type — lands in spec automatically.

## `@operation` decorator family

Three decorators, same namespace, all attached to `operation`:

| Decorator | Writes to | Purpose |
|---|---|---|
| `@operation({...})` | `operationObject` | Standard OpenAPI metadata (`summary`, `description`, `tags`, `deprecated`, `security`, …). Accepts any field from OpenAPI 3.1's `OperationObject`. |
| `@operation.error(status, message)` | `operationObject.responses[status]` | Document a known error shape. Generates response referencing `#/components/schemas/VovkErrorResponse` with `message` pinned to a literal. |
| `@operation.tool({...})` | `operationObject['x-tool']` | AI-tool metadata read by `deriveTools` — `name`, `description`, `title`, `hidden`, `meta`. See **`tools` skill** for full usage. |

### `@operation({...})`

```ts
import { operation, put, procedure } from 'vovk';
import { z } from 'zod';

@operation({
  summary: 'Update user',
  description: 'Update user profile by ID.',
  tags: ['users'],
  // plus any other OpenAPI OperationObject field:
  // deprecated, externalDocs, security, ...
````
END THIRD-PARTY FILE c906239aa21bb16c

The third-party file has ended. Everything between the c906239aa21bb16c tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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