> For the complete documentation index, see [llms.txt](https://docs.stackai.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stackai.com/workflow-builder/inputs.md). # Inputs Input nodes define how data enters your StackAI workflow — from user messages and uploaded files to scheduled triggers and external form submissions. Every workflow starts with at least one input node. Choose the type that matches how your agent receives data. ### In this section

Topic	Page
Input Node Accept text, structured data, or user messages from the interface or API.	/spaces/FSlso1Kjob5CLDrh0dVn/pages/jYCuAzL4Sv2RwJDvIDTP
Files Node Accept uploaded files — PDFs, spreadsheets, images — as workflow inputs.	/spaces/FSlso1Kjob5CLDrh0dVn/pages/bBAKtVVoITit4Ky9P2jl
URL Input Node Fetch and use web page content as a workflow input.	/spaces/FSlso1Kjob5CLDrh0dVn/pages/wy8TAMEHcAgr6PHE3vR3
Audio Input Node Accept audio files for transcription or analysis.	/spaces/FSlso1Kjob5CLDrh0dVn/pages/cjC6ZUfmGndeGoX6q3SR
Trigger Node Start a workflow automatically on a schedule or external event.	/spaces/FSlso1Kjob5CLDrh0dVn/pages/YMP8x0dWeHoxFEPLGgYP

### Pick the right input for your use case * Chat or API interface? Use the [**Input Node**](/workflow-builder/inputs/input-node.md). * Handling uploaded documents? Use the [**Files Node**](/workflow-builder/inputs/files-node.md). * Scheduled or event-driven jobs? Use the [**Trigger Node**](/workflow-builder/inputs/trigger-node.md). * Working with audio? Use the [**Audio Input Node**](/workflow-builder/inputs/audio-input-node.md)**.** --- # 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 dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.stackai.com/workflow-builder/inputs.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.