# Todo 52.2 Benchmark URL Transport Compatibility Plan

**Status:** done

## Goal

Ensure every accepted benchmark base URL can be constructed by the production httpx transport.

## Scope

- Validate the complete URL with `httpx.URL` after structural and control-character checks.
- Convert `httpx.InvalidURL` and invalid port/IDNA cases into stable Pydantic configuration errors.
- Keep valid HTTP(S) Unicode hostnames that httpx accepts.

## Files

- Modify: `src/agent_lab/application/benchmark.py`
- Modify: `tests/test_benchmark_config.py`

## Verification

- `uv run pytest tests/test_benchmark_config.py tests/test_tool_invocation_comparison.py -q`
- `uv run pytest`
- `git diff --check`

## Observe / Update

- Config validation now uses the production httpx URL semantics for IDNA and port compatibility.
- Focused tests passed (`72 passed`) and the full suite passed at this checkpoint (`477 passed`).