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Improve validation error retry message #3193

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Improve validation error retry message #3193

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ae734e2
Improve validation error retry message
dmontagu Oct 17, 2025
d893b87
Merge branch 'main' into dmontagu/improve-validation-error-retry-message
dmontagu Oct 24, 2025
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5 changes: 4 additions & 1 deletion pydantic_ai_slim/pydantic_ai/messages.py
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Original file line number Diff line number Diff line change
Expand Up @@ -882,7 +882,10 @@ def model_response(self) -> str:
description = self.content
else:
json_errors = error_details_ta.dump_json(self.content, exclude={'__all__': {'ctx'}}, indent=2)
description = f'{len(self.content)} validation errors: {json_errors.decode()}'
plural = isinstance(self.content, list) and len(self.content) != 1
description = (
f'{len(self.content)} validation error{"s" if plural else ""}:\n```json\n{json_errors.decode()}\n```'
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I like using format_as_xml as Samuel suggested

)
return f'{description}\n\nFix the errors and try again.'

def otel_event(self, settings: InstrumentationSettings) -> Event:
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2 changes: 1 addition & 1 deletion tests/models/cassettes/test_gemini/test_gemini_drop_exclusive_maximum.yaml
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Expand Up @@ -259,7 +259,7 @@ interactions:
name: get_chinese_zodiac
response:
call_error: |-
1 validation errors: [
1 validation error: [
{
"type": "greater_than",
"loc": [
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9 changes: 6 additions & 3 deletions tests/test_agent.py
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Expand Up @@ -186,7 +186,7 @@ def return_model(messages: list[ModelMessage], info: AgentInfo) -> ModelResponse
),
ModelResponse(
parts=[ToolCallPart(tool_name='final_result', args='{"a": 42, "b": "foo"}', tool_call_id=IsStr())],
usage=RequestUsage(input_tokens=87, output_tokens=14),
usage=RequestUsage(input_tokens=89, output_tokens=14),
model_name='function:return_model:',
timestamp=IsNow(tz=timezone.utc),
),
Expand Down Expand Up @@ -245,7 +245,9 @@ def check_b(cls, v: str) -> str:
retry_prompt = user_retry.parts[0]
assert isinstance(retry_prompt, RetryPromptPart)
assert retry_prompt.model_response() == snapshot("""\
1 validation errors: [
1 validation error:
```json
[
{
"type": "value_error",
"loc": [
Expand All @@ -255,6 +257,7 @@ def check_b(cls, v: str) -> str:
"input": "foo"
}
]
```

Fix the errors and try again.""")

Expand Down Expand Up @@ -1763,7 +1766,7 @@ class CityLocation(BaseModel):
),
ModelResponse(
parts=[TextPart(content='{"city": "Mexico City", "country": "Mexico"}')],
usage=RequestUsage(input_tokens=85, output_tokens=12),
usage=RequestUsage(input_tokens=87, output_tokens=12),
model_name='function:return_city_location:',
timestamp=IsDatetime(),
),
Expand Down