fix(langchain): enable PreRouter by default to match Python behavior#91
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saschabuehrle merged 1 commit intomainfrom Nov 24, 2025
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**Problem**: TypeScript LangChain integration had `enablePreRouter: false` by default, causing ALL queries to go through drafter first, relying only on quality-based cascading. **Solution**: Changed default to `enablePreRouter: true` to match Python's behavior. **What this fixes**: - Complex queries (HARD/EXPERT) are now analyzed BEFORE sending to drafter - Very complex queries skip drafter entirely and go straight to verifier - Saves latency by avoiding unnecessary drafter attempts on complex queries - Matches Python LangChain integration behavior (enable_pre_router=True) **Changes**: 1. `wrapper.ts:60` - Changed `enablePreRouter ?? false` to `enablePreRouter ?? true` 2. `types.ts:47` - Updated documentation from `@default false` to `@default true` **Verification**: - ✅ All 62 TypeScript tests passing - ✅ n8n integration already has correct default (useComplexityRouting: true) - ✅ Behavior now consistent across Python and TypeScript
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Problem
TypeScript LangChain integration had
enablePreRouter: falseby default, which meant:This was inconsistent with Python's
enable_pre_router=Truedefault.Solution
Changed TypeScript default to
enablePreRouter: trueto match Python behavior.What This Fixes
✅ Complex queries analyzed BEFORE sending to drafter
✅ Matches Python behavior exactly
enable_pre_router=True(default)enablePreRouter: true(now default)useComplexityRouting: true(already correct)Changes
packages/langchain-cascadeflow/src/wrapper.ts:60enablePreRouter ?? false→enablePreRouter ?? truepackages/langchain-cascadeflow/src/types.ts:47@default false→@default trueTesting
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