golang-swagger

The saved excerpt is a snapshot from when this skill was listed. The external source remains the complete and most current version.

---
name: golang-swagger
description: "Golang OpenAPI/Swagger documentation with swaggo/swag — annotation comments (@Summary, @Param, @Success, @Router, @Security), swag init code generation, framework integrations (gin, echo, fiber, chi, net/http), security definitions (Bearer/JWT, OAuth2, API key), and struct tags (swaggertype, enums, example, swaggerignore). Apply when adding or maintaining Swagger/OpenAPI docs in a Go project, or when the codebase imports github.com/swaggo/swag, github.com/swaggo/gin-swagger, github.com/swaggo/echo-swagger, github.com/swaggo/http-swagger, or github.com/swaggo/files."
user-invocable: true
license: MIT
compatibility: Designed for Claude Code, Codex or similar harness. Requires go and swag CLI.
metadata:
  author: samber
  version: "1.1.2"
  openclaw:
    emoji: "📋"
    homepage: https://github.com/samber/cc-skills-golang
    requires:
      bins:
        - go
        - swag
    install:
      - kind: go
        package: github.com/swaggo/swag/cmd/swag@latest
        bins: [swag]
    skill-library-version: "2.0.0-rc5"
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(golangci-lint:*) Bash(git:*) Agent WebFetch mcp__context7__resolve-library-id mcp__context7__query-docs Bash(swag:*) AskUserQuestion Bash(godig:*) Bash(gopls:*) LSP mcp__gopls__*
paths:
  - "**/*.go"
---

**Persona:** You are a Go API documentation engineer. You treat docs as a contract — accurate, complete annotations prevent integration bugs and make the Swagger UI the source of truth for API consumers.

**Modes:**

- **Build** — adding Swagger to a new or existing Go project: set up the toolchain, annotate handlers, generate docs, wire the UI endpoint.
- **Audit** — reviewing existing swagger annotations for completeness, correctness, and security coverage.

**Dependencies:**

- swag: `go install github.com/swaggo/swag/cmd/swag@latest`

## Setup

Three steps to get Swagger UI running:

```bash
swag init                        # generates docs/ with docs.go, swagger.json, swagger.yaml
swag init -g cmd/api/main.go     # if general info is not in main.go
swag fmt                         # format annotation comments (like go fmt)
```

Import the `docs` package to register the spec. Use a blank import when only wiring the UI; use a named import when you also need to override `docs.SwaggerInfo` at runtime:

```go
import _ "yourmodule/docs"          // blank: registers spec, no identifier
import docs "yourmodule/docs"       // named: use when overriding SwaggerInfo
```

Wire the UI endpoint — pick your framework:

```go
// Gin
r.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))

// Echo
e.GET("/swagger/*", echoSwagger.WrapHandler)

// Fiber
app.Get("/swagger/*", fiberSwagger.WrapHandler(swaggerFiles.Handler))

// net/http
mux.Handle("/swagger/", httpSwagger.Handler(swaggerFiles.Handler))

// Chi
r.Get("/swagger/*", httpSwagger.Handler(swaggerFiles.Handler))
```

Access the UI at `/swagger/index.html`.

For dynamic host/basepath (multi-environment), use a named import and override before serving:

```go
import docs "yourmodule/docs"

docs.SwaggerInfo.Host     = os.Getenv("API_HOST")
docs.SwaggerInfo.BasePath = "/api/v1"
```

[Full CLI reference](references/swag-cli.md)

## General API Info

Place in `main.go` (or the file passed via `-g`). These annotations define the top-level spec:

```go
// @title           My API
// @version         1.0
// @description     Short description of the API.
// @host            localhost:8080
// @BasePath        /api/v1
// @schemes         http https

// @contact.name    API Support
// @contact.email   [email protected]
// @license.name    Apache 2.0

// @securityDefinitions.apikey Bearer
// @in header
// @name Authorization
// @description Type "Bearer" followed by a space and the JWT token.
```

## Operation Annotations

Annotate each handler function. The standard doc comment (`// FuncName godoc`) must precede swag annotations — it anchors indentation for `swag fmt`.

```go