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Currently we ignore the input schema in the branch and instead use the input schema from the previous node (or overall graph schema) This change makes the input schema to branches respected. This means that if you try to pass extra keys and they're NOT in the input schema, you will receive an error. If you don't provide an annotation in the router, it will fall back to the previous node's input schema / full graph state schema Alternative solution is to just ignore the input schema in the router altogether (including ignoring the schema from previous node / full graph), but personally I find it more confusing. --------- Co-authored-by: Nuno Campos <nuno@langchain.dev>