| name | phart-dag-chart |
| description | Validate ask/scillm DAG JSON and render PHART 1.5 ASCII decision-tree charts for terminals and dry-run output. DAG.json in → chart on stdout or actionable errors on stderr (no tracebacks). Python 3.14+ with PHART from github.com/scottvr/phart.
|
| allowed-tools | Bash, Read |
| triggers | ["render dag chart","dag ascii chart","render phart dag chart","validate dag json","dag decision tree","dry-run dag chart"] |
| provides | ["dag-ascii-chart","dag-validate"] |
| composes | [] |
| taxonomy | ["precision","validation"] |
phart-dag-chart
Structural validation and PHART rendering for ask.dag.v1 (and scillm.exec.graph.v1 input normalized for display).
Contract
| Input | Output |
|---|
Valid dag.json | chart → fenced ASCII decision tree on stdout |
| Invalid JSON / schema / cycle / unknown dep | stderr error [code]: … + optional hint:; exit 1 |
| Missing file / bad usage | exit 2 |
No raw Python tracebacks for expected failures.
Commands
./run.sh validate plans/my.dag.json
./run.sh validate plans/my.dag.json --json
./run.sh chart plans/my.dag.json
Composed by
- $ask — dry-run and
format_dag_ascii_chart() prefer this skill (phart-git renderer) before in-process PyPI fallback.
Validation messages
Aligned with $ask validate_ask_dag for structure (schema, node ids, types, depends_on, cycles). Chart mode skips skill registry checks; warns on empty skill.run or join nodes without depends_on.
Requirements
- Python ≥3.14 (PHART 1.5 git rev pinned in
pyproject.toml / uv.lock)
- uv for
./run.sh
Common mistakes
- Passing a directory instead of a
.json file → error [not_a_file].
- Duplicate node ids or dependency cycles → validation exit 1 with
hint: (no Python traceback).
- Expecting PHART 1.5 on Python 3.12 → use
$ask in-process PyPI fallback; this skill needs 3.14+.
