OpenAPI to Function Calling — Turn Swagger into LLM Tools
OpenAPI to Function Calling converts an OpenAPI (Swagger) spec into a JSON structure suitable for LLM function/tool calling. Each path and method becomes a tool with a name, description, and parameters derived from the API schema.
Why Use This Tool?
- Faster integration: Skip hand-writing tool schemas for every endpoint.
- Single source: Keep your API spec as the source of truth; regenerate tools when the API changes.
- Standard format: Output follows common function-calling schemas (e.g. OpenAI tools).
Key Features
- Paths and methods: Reads paths and operations from the spec.
- Parameters: Maps query/path parameters into tool parameters.
- Names and descriptions: Uses operationId, summary, and description when present.
- Copy: One-click copy of the generated JSON.
How it Works
The tool parses the pasted OpenAPI JSON, iterates over paths and HTTP methods, and builds a list of tools. Each tool has a name (from operationId or derived), a description, and a parameters object. Request body schemas are hinted as a body parameter. The result is a JSON object with a tools array.
Try OpenAPI to Function Calling
Paste your OpenAPI or Swagger JSON above. The function-calling JSON appears below. Copy it into your LLM client or backend.
简体中文
OpenAPI 转 LLM 函数调用 Schema 生成器
从 OpenAPI 描述自动生成适用于工具调用和智能体的 LLM 函数调用 Schema。
한국어
OpenAPI → LLM 함수 스키마 생성기
OpenAPI 스펙으로부터 도구·에이전트용 LLM 함수 호출 스키마를 자동으로 생성합니다.
日本語
OpenAPI から LLM 関数スキーマ生成ツール
OpenAPI 仕様から、ツール呼び出しやエージェント向けの LLM 関数コーリングスキーマを自動生成します。