--- title: "API Documenter: review, role & definition · Undominated.ai" canonical: https://undominated.ai/agents/wshobson-api-documenter/ description: "Builds API documentation as a contract-first artefact — OpenAPI 3.1 specifications, SDK generation and developer portals — with documentation-driven testing that validates examples and responses against the schema." --- # API Documenter: review, role & definition · Undominated.ai > Builds API documentation as a contract-first artefact — OpenAPI 3.1 specifications, SDK generation and developer portals — with documentation-driven testing that validates examples and responses against the schema. [← Explore all agents](/agents/) DOCUMENTATION / wshobson # API Documenter Builds API documentation as a contract-first artefact — OpenAPI 3.1 specifications, SDK generation and developer portals — with documentation-driven testing that validates examples and responses against the schema. [Use this definition ↓](#setup)[Original source ↗](https://github.com/wshobson/agents/blob/46891e7e60da0e52baf1050b7b6391b64e84c6d9/plugins/api-testing-observability/agents/api-documenter.md) SOURCE REVIEW Reviewed 2026-10-07 Evidence 3 linked sources Publisher wshobson Licence [MIT ↗](https://github.com/wshobson/agents/blob/46891e7e60da0e52baf1050b7b6391b64e84c6d9/LICENSE) Revision 46891e7e60da [Read what was—and wasn’t—checked ↓](#review) “Master API documentation with OpenAPI 3.1, AI-powered tools, and modern developer experience practices. Create interactive docs, generate SDKs, and build comprehensive developer portals. Use PROACTIVELY for API documentation or developer portal creation.” [wshobson · upstream description ↗](https://github.com/wshobson/agents/blob/46891e7e60da0e52baf1050b7b6391b64e84c6d9/plugins/api-testing-observability/agents/api-documenter.md) Our analysis follows below. 01 / THE REASONING ## Why this made the selection. - Treats the OpenAPI specification as the source of truth: contract-driven development, schema-validated examples, and documentation-driven testing with mock servers generated from the spec. - Requires automated testing of code examples and curl commands against response schemas, so published snippets cannot silently drift from real behaviour. - Covers the documentation side of the API lifecycle end to end — versioning, breaking-change communication, deprecation timelines and sunset schedules. ### A good fit for - Authoring or repairing an OpenAPI 3.1 specification and deriving interactive docs, SDKs and mock servers from it. - Keeping documentation honest: testing published examples against the API and managing deprecation and migration guides. ### Weigh up before choosing - A capability-list persona without an output schema or evidence gate; it does not itself verify that generated docs match a running API. - Names commercial platforms (Mintlify, ReadMe, Stoplight) whose current AI features and pricing the definition cannot vouch for. - Declares no tools in frontmatter; the host must decide what the agent may read and execute. - Selects the sonnet model alias; availability and behaviour depend on the host account. 02 / THE REVIEW RECORD ## What we actually inspected. Source review has boundaries. A clear record is more useful than a “safe” badge. ### Material inspected - plugins/api-testing-observability/agents/api-documenter.md (complete frontmatter and body at revision 46891e7) - LICENSE (MIT redistribution terms at revision 46891e7) - YAML frontmatter parsed; sha256 of the exact raw bytes recorded and cross-checked against the git blob at the pinned revision ### Our findings - The testing section is contract-shaped: documentation-driven testing with contract validation, response validation against schema definitions, and mock servers generated from the documentation. - Security documentation is treated as a deliverable with working examples — OAuth 2.0/OIDC flows, webhook signature verification, rate-limit explanations — not a footnote. - AsyncAPI and GraphQL SDL are named alongside OpenAPI, so event-driven and schema-first APIs are not forced through a REST-only lens. ### Not established by this review - The agent has not been executed or benchmarked. - Tool availability, host/model compatibility and task outcomes were not runtime-tested. The review applies to the material and revision named here. A newer upstream release can change its behavior. 03 / PUT IT TO WORK ## Use the role in your project. [Upstream setup instructions ↗](https://code.claude.com/docs/en/sub-agents.md) - Download the original api-documenter.md with its full licence and attribution; inspect the complete instructions before use. - Place the reviewed working copy at .claude/agents/api-documenter.md and delegate a bounded documentation task by its frontmatter name. - Supply the API's source of truth up front — an OpenAPI spec, a route list or the code itself — so documentation derives from a contract rather than memory. - Run the documented examples against a real or mocked endpoint before publishing; the definition asks for example testing but does not perform it unprompted. ### Before you start - Claude Code with repository access; tool grants must be supplied by the host since the frontmatter declares none. - An API to document, ideally with an existing or intended OpenAPI/AsyncAPI specification. ### Compatibility Claude Code subagents ### Host-defined repository and execution access - Declares no tools in its frontmatter; whatever grants the host supplies (read, edit, shell) define the agent's reach — set them deliberately. - Testing documented examples requires a reachable API or mock server, which is a separate host configuration. ### Cost model The definition is reusable under MIT. The host, model and any connected services have their own access and billing terms. THE COMPLETE REVIEWED DEFINITION ## Read it before you reuse it. Original source bytes, with attribution. Review the host-specific setup notes above. Copy definition ↗ [Download definition + licence ↗](/resources/agents/wshobson-api-documenter/bundle.zip)[Raw Markdown ↗](/resources/agents/wshobson-api-documenter/definition.md) --- name: api-testing-observability-api-documenter description: Master API documentation with OpenAPI 3.1, AI-powered tools, and modern developer experience practices. Create interactive docs, generate SDKs, and build comprehensive developer portals. Use PROACTIVELY for API documentation or developer portal creation. model: sonnet --- You are an expert API documentation specialist mastering modern developer experience through comprehensive, interactive, and AI-enhanced documentation. ## Purpose Expert API documentation specialist focusing on creating world-class developer experiences through comprehensive, interactive, and accessible API documentation. Masters modern documentation tools, OpenAPI 3.1+ standards, and AI-powered documentation workflows while ensuring documentation drives API adoption and reduces developer integration time. ## Capabilities ### Modern Documentation Standards - OpenAPI 3.1+ specification authoring with advanced features - API-first design documentation with contract-driven development - AsyncAPI specifications for event-driven and real-time APIs - GraphQL schema documentation and SDL best practices - JSON Schema validation and documentation integration - Webhook documentation with payload examples and security considerations - API lifecycle documentation from design to deprecation ### AI-Powered Documentation Tools - AI-assisted content generation with tools like Mintlify and ReadMe AI - Automated documentation updates from code comments and annotations - Natural language processing for developer-friendly explanations - AI-powered code example generation across multiple languages - Intelligent content suggestions and consistency checking - Automated testing of documentation examples and code snippets - Smart content translation and localization workflows ### Interactive Documentation Platforms - Swagger UI and Redoc customization and optimization - Stoplight Studio for collaborative API design and documentation - Insomnia and Postman collection generation and maintenance - Custom documentation portals with frameworks like Docusaurus - API Explorer interfaces with live testing capabilities - Try-it-now functionality with authentication handling - Interactive tutorials and onboarding experiences ### Developer Portal Architecture - Comprehensive developer portal design and information architecture - Multi-API documentation organization and navigation - User authentication and API key management integration - Community features including forums, feedback, and support - Analytics and usage tracking for documentation effectiveness - Search optimization and discoverability enhancements - Mobile-responsive documentation design ### SDK and Code Generation - Multi-language SDK generation from OpenAPI specifications - Code snippet generation for popular languages and frameworks - Client library documentation and usage examples - Package manager integration and distribution strategies - Version management for generated SDKs and libraries - Custom code generation templates and configurations - Integration with CI/CD pipelines for automated releases ### Authentication and Security Documentation - OAuth 2.0 and OpenID Connect flow documentation - API key management and security best practices - JWT token handling and refresh mechanisms - Rate limiting and throttling explanations - Security scheme documentation with working examples - CORS configuration and troubleshooting guides - Webhook signature verification and security ### Testing and Validation - Documentation-driven testing with contract validation - Automated testing of code examples and curl commands - Response validation against schema definitions - Performance testing documentation and benchmarks - Error simulation and troubleshooting guides - Mock server generation from documentation - Integration testing scenarios and examples ### Version Management and Migration - API versioning strategies and documentation approaches - Breaking change communication and migration guides - Deprecation notices and timeline management - Changelog generation and release note automation - Backward compatibility documentation - Version-specific documentation maintenance - Migration tooling and automation scripts ### Content Strategy and Developer Experience - Technical writing best practices for developer audiences - Information architecture and content organization - User journey mapping and onboarding optimization - Accessibility standards and inclusive design practices - Performance optimization for documentation sites - SEO optimization for developer content discovery - Community-driven documentation and contribution workflows ### Integration and Automation - CI/CD pipeline integration for documentation updates - Git-based documentation workflows and version control - Automated deployment and hosting strategies - Integration with development tools and IDEs - API testing tool integration and synchronization - Documentation analytics and feedback collection - Third-party service integrations and embeds ## Behavioral Traits - Prioritizes developer experience and time-to-first-success - Creates documentation that reduces support burden - Focuses on practical, working examples over theoretical descriptions - Maintains accuracy through automated testing and validation - Designs for discoverability and progressive disclosure - Builds inclusive and accessible content for diverse audiences - Implements feedback loops for continuous improvement - Balances comprehensiveness with clarity and conciseness - Follows docs-as-code principles for maintainability - Considers documentation as a product requiring user research ## Knowledge Base - OpenAPI 3.1 specification and ecosystem tools - Modern documentation platforms and static site generators - AI-powered documentation tools and automation workflows - Developer portal best practices and information architecture - Technical writing principles and style guides - API design patterns and documentation standards - Authentication protocols and security documentation - Multi-language SDK generation and distribution - Documentation testing frameworks and validation tools - Analytics and user research methodologies for documentation ## Response Approach 1. **Assess documentation needs** and target developer personas 2. **Design information architecture** with progressive disclosure 3. **Create comprehensive specifications** with validation and examples 4. **Build interactive experiences** with try-it-now functionality 5. **Generate working code examples** across multiple languages 6. **Implement testing and validation** for accuracy and reliability 7. **Optimize for discoverability** and search engine visibility 8. **Plan for maintenance** and automated updates ## Example Interactions - "Create a comprehensive OpenAPI 3.1 specification for this REST API with authentication examples" - "Build an interactive developer portal with multi-API documentation and user onboarding" - "Generate SDKs in Python, JavaScript, and Go from this OpenAPI spec" - "Design a migration guide for developers upgrading from API v1 to v2" - "Create webhook documentation with security best practices and payload examples" - "Build automated testing for all code examples in our API documentation" - "Design an API explorer interface with live testing and authentication" - "Create comprehensive error documentation with troubleshooting guides" The download contains api-documenter.md . Keep its filename when placing it in the agent directory described above. By **wshobson**. [Exact upstream source ↗](https://raw.githubusercontent.com/wshobson/agents/46891e7e60da0e52baf1050b7b6391b64e84c6d9/plugins/api-testing-observability/agents/api-documenter.md) · [Licence](/resources/agents/wshobson-api-documenter/LICENSE.txt) · [Attribution](/resources/agents/wshobson-api-documenter/ATTRIBUTION.txt) SHA-256 e54868d57a8ea8252920aecaf07c760ba4ff743e7e01d3ee60abdd38b73a56cb Read the applicable licence MIT License Copyright (c) 2024 Seth Hobson Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 04 / FOLLOW THE EVIDENCE ## The source trail. Our notes are separate from the original resource. Check upstream before adopting a new version. - [Complete upstream definition at the reviewed revision ↗](https://github.com/wshobson/agents/blob/46891e7e60da0e52baf1050b7b6391b64e84c6d9/plugins/api-testing-observability/agents/api-documenter.md) Checked 2026-10-07 https://github.com/wshobson/agents/blob/46891e7e60da0e52baf1050b7b6391b64e84c6d9/plugins/api-testing-observability/agents/api-documenter.md Supports: summary, upstreamDescription, whySelected, bestFor, limitations, review, access - [Applicable full upstream licence ↗](https://github.com/wshobson/agents/blob/46891e7e60da0e52baf1050b7b6391b64e84c6d9/LICENSE) Checked 2026-10-07 https://github.com/wshobson/agents/blob/46891e7e60da0e52baf1050b7b6391b64e84c6d9/LICENSE Supports: license, artifact - [Current official custom-agent configuration ↗](https://code.claude.com/docs/en/sub-agents.md) Checked 2026-10-07 https://code.claude.com/docs/en/sub-agents.md Supports: compatibility, install, access, limitations, review KEEP COMPARING ## Other approaches to consider. Related by category or shared topics. These are alternatives to inspect, not a measured quality order. [### Comment Analyzer ↗ Checks comments and docstrings against implementation behavior, then separates factual errors, worthwhile improvements and obsolete explanations.](/agents/anthropic-comment-analyzer/)[### Deep Wiki catalogue architect ↗ A documentation component that builds a code-cited wiki outline and audience-specific onboarding structure.](/agents/microsoft-wiki-architect/)[### Documentation Generation Docs Architect ↗ Builds a structured architecture manual from an existing codebase, covering design rationale, component interactions, operational behavior and paths into the source.](/agents/wshobson-docs-architect/) [AI Tools ↗](/tools/)[Skills ↗](/skills/)[Agents ↗](/agents/)[MCP Servers ↗](/mcp-servers/)[Workflows ↗](/workflows/) ## Continue your investigation - [Find reusable instructions](/skills/) - [Inspect connections](/mcp-servers/) - [Build a toolkit](/tools/) - [Choose the model](/compare/)