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The YAML format of a workflow's file, which read_workflow returns and save_workflow takes: stages, after, base, model and teams.
# Workflow files
A workflow's file is YAML: an optional `description`, then `stages`. The workflow's name is not in the file. Unknown fields are refused.
| Field | Meaning |
|---|---|
| `name` | One line, unique in the workflow. |
| `after` | The names of the stages whose outputs it gets; it starts once all of them have finished. Absent means the previous stage in the list, and for the first stage none, so a file without `after` is a chain. `[]` means it starts from the brief. |
| `base` | `parent`, the default: branch from the commit its one `after` stage finished at, or for a stage with none, from where the workflow was started. `main`: branch from the default branch. Refused on a stage with more than one `after` stage, which always branches from the default branch and is told the branches it can merge. |
| `model` | Also picks the vendor: `gpt-*` models run on Codex, `gemini-*` models on Antigravity, every other model on Claude Code. |
| `prompt` | The stage agent's instructions. |
| `agents` | In place of `model`: a list of at least two, each with `name`, `model` and `prompt`, that runs the stage as a team. They work in the stage's one task and worktree and talk through a shared board; each gets the stage's `prompt` and then its own, and the first agent finishes the stage. |
Every stage runs as its own task. Exactly one stage is final (no other stage comes after it), and cycles are refused.
```yaml
description: Build a change, review and test it in parallel, then fix what they found.
stages:
- name: Build
model: claude-opus-5-5
prompt: Implement the brief.
- name: Review
after: [Build]
model: gpt-6.1-sol
prompt: Review the Build stage's work and list the problems.
- name: Test
after: [Build]
model: gemini-4-argon-high
prompt: Exercise the change and report what fails.
- name: Fix
after: [Review, Test]
agents:
- name: fixer
model: claude-opus-5-5
prompt: Fix every problem the reports list.
- name: checker
model: gpt-6.1-sol
prompt: Check each fix as the fixer lands it.
prompt: Merge the branches you are given and address both reports.
```