> For the complete documentation index, see [llms.txt](https://docs.fastn.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fastn.ai/reference.md). # Reference - [Workflow runtime API](https://docs.fastn.ai/reference/workflow-runtime.md): What a workflow can reach at runtime: ctx, multi-tenant headers, connectors, unified APIs, database, state, secrets and configs. - [HTTP API](https://docs.fastn.ai/reference/api.md): Calling workflows and unified endpoints over HTTP. - [Errors and failure states](https://docs.fastn.ai/reference/errors.md): What each failure state means, where fastn shows you the detail, and what to do about it. - [fastn for AI agents](https://docs.fastn.ai/reference/ai-agents.md): A single dense page for LLMs and coding agents: the model, the runtime surface, the endpoints, and the things that are easy to get wrong. - [FAQs](https://docs.fastn.ai/reference/faqs.md): Short answers to the questions that come up most. - [Glossary](https://docs.fastn.ai/reference/glossary.md): Alphabetized definitions of every term used across the Fastn platform and documentation. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.fastn.ai/reference.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.