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Cwltool

Reference CWL runner and validator. Used by summarize-cwl for entrypoint validation.

draft cli-toolcli/cwltool
Revised
2026-05-10
Rev
1

cwltool

Reference implementation of the Common Workflow Language standard. The Foundry uses it for entrypoint validation (cwltool --validate) before normalization; runtime execution is out of scope for current Molds.

Install

uvx cwltool runs cwltool in an ephemeral environment without a project venv. For repeat use, uv tool install cwltool puts the binary on PATH.

Fallback without uv: pip install cwltool (in a venv).

Notes

  • Validation is structural, not behavioral. A workflow that validates may still fail under execution.
  • The Foundry pairs cwltool --validate with cwl-utils cwl-normalizer for downstream extraction — the normalized JSON is the preferred surface.