Fix JSON schema flow state kickoff inputs (#6325)

Allow required JSON schema state fields to be supplied by kickoff inputs
instead of requiring every field to exist in state.default before
runtime.

Example: a flow with required lead_name and no state.default can now run
with kickoff inputs={"lead_name": "Ada Lovelace"}.

lib/crewai/src/crewai/flow/runtime/__init__.py

@@ -227,7 +227,12 @@ def _build_definition_state_model(
             pass
 
         model_class = StateWithId
-    return model_class(**kwargs)
+    try:
+        return model_class(**kwargs)
+    except ValidationError as e:
+        if any(error.get("type") != "missing" for error in e.errors()):
+            raise
+        return model_class.model_construct(**kwargs)
 
 
 def _iter_condition_events(condition: FlowDefinitionCondition) -> Iterator[str]:

lib/crewai/tests/test_flow_from_definition.py

@@ -357,6 +357,27 @@ methods:
     listen: begin
 """
 
+JSON_SCHEMA_REQUIRED_INPUT_STATE_YAML = """
+schema: crewai.flow/v1
+name: JsonSchemaRequiredInputStateFlow
+state:
+  type: json_schema
+  json_schema:
+    title: LeadState
+    type: object
+    required:
+      - lead_name
+    properties:
+      lead_name:
+        type: string
+methods:
+  begin:
+    start: true
+    do:
+      call: expression
+      expr: state.lead_name
+"""
+
 PYDANTIC_REF_WITH_SCHEMA_FALLBACK_YAML = f"""
 schema: crewai.flow/v1
 name: SchemaFallbackFlow
@@ -2298,6 +2319,18 @@ def test_json_schema_state_validates_inputs():
         flow.kickoff(inputs={"count": "not-a-number"})
 
 
+def test_json_schema_state_required_fields_can_come_from_kickoff_inputs():
+    flow = Flow.from_definition(
+        FlowDefinition.from_declaration(contents=JSON_SCHEMA_REQUIRED_INPUT_STATE_YAML)
+    )
+
+    result = flow.kickoff(inputs={"lead_name": "Ada Lovelace"})
+
+    assert result == "Ada Lovelace"
+    assert flow.state.lead_name == "Ada Lovelace"
+    assert flow.state.id
+
+
 def test_pydantic_state_falls_back_to_json_schema_when_ref_unimportable():
     flow = Flow.from_definition(
         FlowDefinition.from_declaration(contents=PYDANTIC_REF_WITH_SCHEMA_FALLBACK_YAML)