# Flow XO

> Build AI agents and the workflows they run with Flow XO.

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- [Flow XO documentation](https://docs.flowxo.com/index.md): Build AI agents and the workflows they run with Flow XO.
- [How Flow XO fits together](https://docs.flowxo.com/start/concepts.md): Organizations, workspaces, projects, the Blueprint, and how agents and workflows work together.
- [Build a workflow](https://docs.flowxo.com/workflows/build.md): Create a workflow, add and connect steps, and give an agent access to it.
- [Steps](https://docs.flowxo.com/workflows/steps.md): What each workflow step does and how to set it up.
- [Inputs, outputs and variables](https://docs.flowxo.com/workflows/inputs-outputs.md): What the agent sends in, what comes back, and the values a workflow keeps while it runs.
- [Pick, type or calculate a value](https://docs.flowxo.com/workflows/values.md): Use inputs, variables and earlier results in a step, type a value, or calculate one.
- [Google Sheets](https://docs.flowxo.com/workflows/google-sheets.md): Find rows, and insert, update or upsert one row in a worksheet.
- [Advanced JSON](https://docs.flowxo.com/workflows/advanced-json.md): Write a step's input or result as JSON: the format, references, validation, and when to use the form instead.
- [Test and fix a workflow](https://docs.flowxo.com/workflows/testing.md): Run a workflow through your agent, inspect the run, and fix what failed.
- [Connect tools over S3](https://docs.flowxo.com/knowledge/s3-access.md): Reach your Flow XO files from the AWS CLI, rclone, mountpoint-s3 or any S3-compatible tool.
- [Formula reference](https://docs.flowxo.com/reference/formulas.md): Every operator, function and method a workflow formula can use, with examples checked against the formula engine.
- [Step types](https://docs.flowxo.com/reference/steps.md): The steps in the workflow editor's add-step dialog.
- [Workflow limits](https://docs.flowxo.com/reference/limits.md): Default limits on workflow steps, retries, timeouts, waits and run data.