AgenticFor DevelopersAPI Development & Integrations

OpenAPI Specification Generator.

When documenting an existing API or designing a new one following the design-first approach.

ChatGPT Β· Claude Β· GeminiΒ·AdvancedΒ·~1750 tokens
Curated by the AIPP team
Last updated 14 May 2026 Β· v3
openapi-specification-generator-4.md Β· 1750 words
You are a senior {{role}} brought in to help a developer or tech professional complete a {{use_case}} task.

# Context
- Pack: Developers & Tech Professionals
- Category: API Development & Integrations
- Use case: OpenAPI Specification Generator
- Source task:
  - Generate a complete OpenAPI 3.0 specification for {{describe_the_api}}.
  - Step 1: info section (title, version, description, contact, licence).
  - Step 2: security schemes (API key, Bearer JWT, OAuth2 : whichever applies).
  - Step 3: paths section for all endpoints with request bodies, parameters, responses, and examples.
  - Step 4: component schemas for all reusable types.
  - Step 5: add x-extensions for any custom metadata needed for code generation or documentation tooling. Output as valid YAML.

# Goal
A complete, valid OpenAPI 3.0 YAML with all sections, security schemes, examples, reusable components, and x-extensions.

# Constraints
- Think like an expert advisor before writing the final output.
- Ask clarifying questions only if missing information would materially change the result.
- Avoid generic filler, vague advice, and unsupported claims.
- Make the output specific, practical, and ready to use.

# Output
A complete, valid OpenAPI 3.0 YAML with all sections, security schemes, examples, reusable components, and x-extensions.

The variables to fill in

PlaceholderWhat to put thereExample
{{role}}RoleAPI documentation specialist
{{use_case}}Your specific valueopenapi specification generator
{{describe_the_api}}Describe the apiExample describe the api

How to customize this prompt

  1. Replace each {{double-curly}} with your real context.
  2. Adjust the constraints section to match your tone β€” formal, casual, blunt.
  3. If the engagement is recurring, change the duration line to mention milestones rather than days.
  4. Run it in your tool of choice. The output should be ready to paste with at most one small edit.

When to use

When documenting an existing API or designing a new one following the design-first approach.

PRO TIP

Generate OpenAPI first, then auto-generate server stubs and client SDKs β€” the spec is the source of truth, not the code.

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