Install lowest direct in CI

[Kludex]

Closes #3710

---

Note

Adjust CI to use lowest-direct installs and expand Python matrix, bump a few dependency pins, and harden tests with guarded imports and minor fixes.

• CI:
  • Use uv sync --group dev first and --resolution lowest-direct for lowest-versions; run pytest with --no-sync.
  • Expand Python matrix to include 3.11; increase test-lowest-versions timeout to 35m; set UV_FROZEN="0" for lowest runs.
• Dependencies:
  • Pin exceptiongroup>=1.2.2 (py<3.11).
  • Tighten optional deps: pillow>11.0.0, torch>=2.8.0, vllm>=0.8.0, and boto3-stubs[bedrock-runtime]>=1.40.64.
• Tests/Typing:
  • Guard vendor imports with try_import() and move some imports under TYPE_CHECKING.
  • Bedrock tests parametrize geo prefixes safely when package missing.
  • Google error test now parameterizes error class by name via getattr.
  • Minor refactors in HuggingFace/Anthropic/UI tests and small formatting in create_web_app HTML response.

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[cursor]

Bug: Inconsistent version specifier excludes Pillow 11.0.0

The pillow>11.0.0 constraint uses an exclusive lower bound (>) while all other version constraints in the file consistently use inclusive bounds (>=). In the same PR, vllm>=0.8.0 uses >=. Since Pillow has no version between 11.0.0 and 11.1.0, this effectively sets the minimum to 11.1.0, potentially excluding a valid version. If the intent was to require Pillow 11.0.0 or later, this appears to be a typo and >=11.0.0 would be the correct specifier.

 

[cursor]

Bug: Type alias moved to TYPE_CHECKING breaks runtime import

The AsyncAnthropicClient type alias is now only defined under if TYPE_CHECKING:, but pydantic_ai/models/anthropic.py performs a runtime import with from ..providers.anthropic import AsyncAnthropicClient at line 49. Since TYPE_CHECKING is False at runtime, this import will fail with an ImportError, completely breaking the Anthropic model functionality.

 

[Kludex]

@DouweM is this still needed now that we have the mcp-run-python in another repo? I've already checked that this test is also ran on that repo.

[DouweM]

@Kludex I'm fine removing it.

Note that we also test that it mcp-run-python be started here:

pydantic-ai/docs/mcp/client.md

Lines 140 to 152 in c1213e4

	from pydantic_ai import Agent
	from pydantic_ai.mcp import MCPServerStdio
	server = MCPServerStdio( # (1)!
	'uv', args=['run', 'mcp-run-python', 'stdio'], timeout=10
	)
	agent = Agent('openai:gpt-5', toolsets=[server])
	async def main():
	result = await agent.run('How many days between 2000-01-01 and 2025-03-18?')
	print(result.output)
	#> There are 9,208 days between January 1, 2000, and March 18, 2025.

That makes the test suite require deno. I actually think we should drop that entirely and really treat it as a separate package.

[DouweM]

Should we also move the ${{ matrix.install.command }} here and make the test command uv run --no-sync ...?

[DouweM]

Some warnings from the lowest-versions job:

warning: The direct dependency `boto3-stubs` is unpinned. Consider setting a lower bound when using `--resolution lowest` or `--resolution lowest-direct` to avoid using outdated versions.
warning: The direct dependency `exceptiongroup` is unpinned. Consider setting a lower bound when using `--resolution lowest` or `--resolution lowest-direct` to avoid using outdated versions.
warning: The direct dependency `torch` is unpinned. Consider setting a lower bound when using `--resolution lowest` or `--resolution lowest-direct` to avoid using outdated versions.
warning: The package `boto3-stubs==0.1.8` does not have an extra named `bedrock-runtime`

[DouweM]

Adding matrix.install.command here didn't work?