feat(cli): add --workflow for sequential pattern composition#2069
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1rashiid wants to merge 5 commits into
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feat(cli): add --workflow for sequential pattern composition#20691rashiid wants to merge 5 commits into
1rashiid wants to merge 5 commits into
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Adds a lightweight pattern composition feature that lets users chain
multiple patterns together via a simple YAML/JSON workflow file,
piping each step's output into the next step's input.
* New --workflow flag parses YAML/JSON with steps: [{pattern, input?,
variables?, model?, vendor?}]
* Each step reuses the existing Chatter.Send path, so --stream,
--dry-run, -m/-V, -v, --context, --strategy, --language all continue
to work unchanged
* Pre-flight validation: empty steps, missing pattern, repeated
patterns, and unknown pattern names all fail before any LLM call
* Per-step input override: an optional `input:` field lets a step
ignore the carried output; whitespace-only values are treated as no
override
* Progress + errors use a consistent "[step N/TOTAL pattern]" prefix
on stderr so stdout stays pipe-clean
* Single-pattern -p path is untouched – workflow only activates when
--workflow is set
Tests cover loading, validation, input-override chaining, empty-output
handling, and bad/malformed workflow files.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Adds a
--workflow <file>flag that runs multiple patterns in sequence, piping each step's output into the next step's input. Workflows are simple YAML/JSON files with asteps:list — each step names a pattern and may optionally overrideinput,variables,model, orvendor.Every step reuses the existing
Chatter.Sendpath, so all current flags (--stream,--dry-run,-m,-v,--context, etc.) keep working. Patterns are validated against the local store before any LLM call, and runtime failures stop immediately with a[step N/TOTAL pattern] failed: …error. Progress goes to stderr; final result to stdout. Single-pattern-pusage is untouched.cat article.txt | fabric --workflow wf.yaml --stream🤖 Generated with Claude Code