Emil FilipovandClaude Opus 5 d6cb258484 fix(core): attach the JSON fallbacks via Annotated, not @field_serializer ...

A `@field_serializer` takes the field's one serializer slot, so any subclass
declaring its own serializer for `func`, `coroutine` or `args_schema` would fail
at class creation with `PydanticUserError: Multiple field serializer functions
were defined`. Those subclasses were valid before this PR.

`PlainSerializer` in the field's `Annotated` metadata leaves the decorator slot
free: a subclass serializer is accepted and takes precedence. Output, dump
options and CPU cost are unchanged (0.014 ms vs 0.134 ms on master for a 12-tool
payload, byte-identical).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-13 18:26:31 +02:00

..

benchmarks

perf(core): memoize BaseTool.tool_call_schema subset model and cache model_json_schema (#38073)

2026-06-17 17:17:14 -04:00

integration_tests

core: Add ruff rules for PIE (#26939)

2024-09-27 12:08:35 -04:00

unit_tests

fix(core): attach the JSON fallbacks via Annotated, not @field_serializer

2026-08-13 18:26:31 +02:00

__init__.py

Separate out langchain_core package (#13577)

2023-11-20 13:09:30 -08:00