fabro/test/inferred_command.fabro
Release Repro 69a51e65b9
feat(workflow): infer command nodes from the script attribute
A node with no `shape` defaulted to `box`, which resolves to the agent
handler. That made a shapeless `script` node run as an LLM call prompted
with its own label, while the `script` was reported as inert — wrong
behavior behind a warning.

`script` is read by the command handler and by nothing else, so a
shapeless node that sets it is unambiguously a command node. `shape()`
now infers `parallelogram` in that case. An explicit `shape` still wins.

Two rules keep the inference honest:

- `script_prompt_conflict` — setting both `script` and `prompt` is an
  error. No handler reads both. It fires regardless of shape so that
  adding one cannot downgrade the error to a warning.
- `command_requires_script` — a command node without a script is an
  error. Without this the original trap just moves: a node meant as a
  command that omits its script silently becomes an agent again.

Also drops the `tool_command` alias in favor of `script` alone, routing
the six read sites through a new `Node::script()` accessor.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-07-27 14:59:31 -04:00

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digraph InferredCommand {
graph [goal="Verify a shapeless script node runs as a command"]
rankdir=LR
start [shape=Mdiamond, label="Start"]
exit [shape=Msquare, label="Exit"]
echo_task [label="Echo", script="echo hello"]
start -> echo_task -> exit
}