[BUG CLIENT]: response_format_from_pydantic_model can't accept integer keyword

[LourensT]

Python -VV

Python 3.13.11 (main, Dec  5 2025, 21:16:49) [Clang 21.1.4 ]

Pip freeze

annotated-types==0.7.0
anyio==4.12.0
certifi==2025.11.12
charset-normalizer==3.4.4
eval-type-backport==0.3.1
googleapis-common-protos==1.72.0
h11==0.16.0
httpcore==1.0.9
httpx==0.28.1
idna==3.11
importlib-metadata==8.7.1
invoke==2.2.1
mistralai==1.10.0
opentelemetry-api==1.38.0
opentelemetry-exporter-otlp-proto-common==1.38.0
opentelemetry-exporter-otlp-proto-http==1.38.0
opentelemetry-proto==1.38.0
opentelemetry-sdk==1.38.0
opentelemetry-semantic-conventions==0.59b0
protobuf==6.33.2
pydantic==2.12.5
pydantic-core==2.41.5
python-dateutil==2.9.0.post0
pyyaml==6.0.3
requests==2.32.5
six==1.17.0
typing-extensions==4.15.0
typing-inspection==0.4.2
urllib3==2.6.2
zipp==3.23.0

Reproduction Steps

1 This works

from mistralai.extra import response_format_from_pydantic_model
from pydantic import BaseModel, Field


class MyModel(BaseModel):
    some_list: list[int] = Field(
        default_factory=list,
        description="A list of strings",
        # min_length=1
    )


print(response_format_from_pydantic_model(MyModel))

output

type='json_schema' json_schema=JSONSchema(name='MyModel', schema_definition={'properties': {'some_list': {'description': 'A list of strings', 'items': {'type': 'integer'}, 'title': 'Some List', 'type': 'array'}}, 'title': 'MyModel', 'type': 'object', 'additionalProperties': False}, description=Unset(), strict=True)

2. This does not

from mistralai.extra import response_format_from_pydantic_model
from pydantic import BaseModel, Field


class MyModel(BaseModel):
    some_list: list[int] = Field(
        default_factory=list,
        description="A list of strings",
        min_length=1
    )


print(response_format_from_pydantic_model(MyModel))

exiting with error

Traceback (most recent call last):
  File ".../try.py", line 11, in <module>
    print(response_format_from_pydantic_model(MyModel))
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File ".../.venv/lib/python3.13/site-packages/mistralai/extra/utils/response_format.py", line 13, in response_format_from_pydantic_model
    model_schema = rec_strict_json_schema(model.model_json_schema())
  File ".../.venv/lib/python3.13/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 15, in rec_strict_json_schema
    schema_node[key] = rec_strict_json_schema(value)
                       ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
  File "...venv/lib/python3.13/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 15, in rec_strict_json_schema
    schema_node[key] = rec_strict_json_schema(value)
                       ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
  File "....venv/lib/python3.13/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 15, in rec_strict_json_schema
    schema_node[key] = rec_strict_json_schema(value)
                       ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
  File ".../.venv/lib/python3.13/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 20, in rec_strict_json_schema
    raise ValueError(f"Unexpected type: {schema_node}")
ValueError: Unexpected type: 1

Expected Behavior

output

type='json_schema' json_schema=JSONSchema(name='MyModel', schema_definition={'properties': {'some_list': {'description': 'A list of strings', 'items': {'type': 'integer'}, 'minItems': 1, 'title': 'Some List', 'type': 'array'}}, 'title': 'MyModel', 'type': 'object', 'additionalProperties': False}, description=Unset(), strict=True)

Additional Context

No response

Suggested Solutions

The problems is in ./mistralai/extra/utils/_pydantic_helper.py in rec_strict_json_schema, which recursively sets additionalProperties to false.

my suggested fix in line 9

-     if isinstance(schema_node, (str, bool)) or schema_node is None:
+     if isinstance(schema_node, (str, bool, int)) or schema_node is None:

This works for me. You may also considering adding other immutables here like float, Unicode, although I haven't tested it.