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kymo-parity

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Aktualisiert20. Juni 2026 um 23:45

Check or close Python↔JS feature parity in kymostudio via the conformance suite. Use when adding a feature to one impl (Python or JS) that the other needs, when a JS conformance test diverges from Python's golden, or to confirm a new behavior is locked in both languages. Encodes the rule that Python is the reference impl and JS reconciles toward it.

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SKILL.md

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name	kymo-parity
description	Check or close Python↔JS feature parity in kymostudio via the conformance suite. Use when adding a feature to one impl (Python or JS) that the other needs, when a JS conformance test diverges from Python's golden, or to confirm a new behavior is locked in both languages. Encodes the rule that Python is the reference impl and JS reconciles toward it.
argument-hint	[feature-or-stem]
allowed-tools	Bash Read Edit Grep

This is the Loop 2 parity watcher from docs/research/engineering/loop-engineering/application-kymostudio.md. CLAUDE.md's headline constraint: packages/python and packages/js are two independent impls kept at parity. The conformance suite enforces it — but only for behaviors that have a corpus case. A new feature with no case is invisible to the gate until you add one.

The asymmetry (non-negotiable)

Python is the reference implementation and the sole golden writer. JS is read-only against conformance/golden/. So parity is always restored by reconciling JS toward Python, never by editing the golden or loosening the JS test. The documented root cause of every past divergence was JS rounding — fix it with pyRound (packages/js/src/round.ts, half-to-even) wherever Python uses int(round(...)): hot spots are alignment.ts, bpmn-layout.ts, from-bpmn.ts, to-bpmn.ts.

Two modes

A. Diagnose a divergence (a JS conformance test is red)

Run cd packages/js && npm test and read the deepEqual diff — it names the field and the two values.
Locate where Python computes that field vs where JS does (Grep the field name in both packages/python/src/kymo/ and packages/js/src/).
If the values differ by a rounding boundary (.5 cases, off-by-one px), it's a pyRound site in JS. Apply pyRound; re-run. If it's a genuinely unported feature, port it to JS.
Never touch conformance/golden/* to "fix" this — that inverts the reference direction.

B. Lock a new behavior into both impls

Add a minimal corpus case exercising the behavior to conformance/corpus/<name>.kymo (or a .bpmn fixture under the BPMN corpus).

Regenerate the golden from Python (the writer):

cd packages/python && KYMO_UPDATE_CONFORMANCE=1 uv run --group dev python -m pytest tests/test_conformance.py tests/test_bpmn_conformance.py

Run the JS suite against the new golden:
```
cd packages/js && npm test
```
If JS passes → parity is locked. If it diverges → mode A (port/reconcile JS).
A genuinely tracked-but-unreconciled .bpmn gap goes in conformance/known_divergences.json with a reason — but treat that as a last resort, not a shortcut.

Output

State: the field/feature, which impl was behind, the reconciliation (pyRound site or port), and the final cross-impl /kymo-verify all verdict. If you added a corpus case, name it.

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name	kymo-parity
description	Check or close Python↔JS feature parity in kymostudio via the conformance suite. Use when adding a feature to one impl (Python or JS) that the other needs, when a JS conformance test diverges from Python's golden, or to confirm a new behavior is locked in both languages. Encodes the rule that Python is the reference impl and JS reconciles toward it.
argument-hint	[feature-or-stem]
allowed-tools	Bash Read Edit Grep

The asymmetry (non-negotiable)

Two modes

A. Diagnose a divergence (a JS conformance test is red)

Run cd packages/js && npm test and read the deepEqual diff — it names the field and the two values.
Locate where Python computes that field vs where JS does (Grep the field name in both packages/python/src/kymo/ and packages/js/src/).
If the values differ by a rounding boundary (.5 cases, off-by-one px), it's a pyRound site in JS. Apply pyRound; re-run. If it's a genuinely unported feature, port it to JS.
Never touch conformance/golden/* to "fix" this — that inverts the reference direction.

B. Lock a new behavior into both impls

Add a minimal corpus case exercising the behavior to conformance/corpus/<name>.kymo (or a .bpmn fixture under the BPMN corpus).

Regenerate the golden from Python (the writer):

cd packages/python && KYMO_UPDATE_CONFORMANCE=1 uv run --group dev python -m pytest tests/test_conformance.py tests/test_bpmn_conformance.py

Run the JS suite against the new golden:
```
cd packages/js && npm test
```
If JS passes → parity is locked. If it diverges → mode A (port/reconcile JS).
A genuinely tracked-but-unreconciled .bpmn gap goes in conformance/known_divergences.json with a reason — but treat that as a last resort, not a shortcut.

Output

State: the field/feature, which impl was behind, the reconciliation (pyRound site or port), and the final cross-impl /kymo-verify all verdict. If you added a corpus case, name it.