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title Agently 4.1.4.3 Release Notes
description Direct and nested Pydantic v2 output-model compatibility for ModelRequest and AgentExecution.
keywords Agently, 4.1.4.3, Pydantic, structured output, ModelRequest, AgentExecution

Agently 4.1.4.3 Release Notes

Agently 4.1.4.3 is a focused compatibility patch for structured output. It preserves the public APIs and owner boundaries from 4.1.4.2.

Pydantic output models

Passing a Pydantic v2 BaseModel class directly to .output(...) could fail during request initialization, before the provider was called. The prompt generator treated the class as a generic Python type and attempted to instantiate it without its required fields.

4.1.4.3 recognizes BaseModel classes before generic type handling, recursively projects nested fields into the prompt schema, and preserves the original model class as the result model.

class MeetingMinutes(BaseModel):
    topic: str
    decisions: list[Decision]

minutes = (
    agent
    .input(meeting_text)
    .output(MeetingMinutes, format="json")
    .get_result()
    .get_data_object()
)

assert isinstance(minutes, MeetingMinutes)

The same contract is supported by direct ModelRequest usage and AgentExecution.output(...). Existing dictionary, tuple, JSON Schema, and explicit nested output descriptions remain supported.

Validation

  • Regression coverage includes direct requests, nested Pydantic models, and AgentExecution direct strategy.
  • The release candidate was built as a wheel and installed into an isolated Python 3.10 environment before publication.
  • The complete repository suite and static type gate passed for the underlying fix before release preparation.

Related issue: #329.

Compatibility

  • Package version: 4.1.4.3.
  • Release manifest: compatibility/releases/4.1.4.3.json.
  • Python: >=3.10.
  • Recommended DevTools version remains agently-devtools >=0.1.10,<0.2.0.