OpenAI endpoint required toolchoice

[bearsyankees]

No description provided.

[greptile-apps]

Greptile Summary

This PR automatically requires tool calls for OpenAI-compatible custom endpoints and preserves provider-reported OpenRouter streaming costs.

• Changes the required-tool-choice setting to support automatic, enabled, and disabled modes.
• Threads custom API-base detection into model settings.
• Captures OpenRouter stream costs by response ID and prioritizes them over estimated costs.
• Adds coverage for tool-choice resolution, streamed cost recovery, and runner settings.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code defect identified.

The endpoint-aware tool-choice behavior preserves explicit overrides and provider filtering, while the OpenRouter integration retains existing stream parsing and safely correlates exact costs under a lock.

Important Files Changed

Filename	Overview
strix/config/models.py	Installs a LiteLLM OpenRouter streaming-handler subclass that captures provider-reported cost without changing current parsing behavior.
strix/config/settings.py	Makes required tool choice tri-state so an unset value can activate endpoint-aware defaults.
strix/core/inputs.py	Resolves automatic required tool choice for supported OpenAI-style models using custom API endpoints while preserving explicit overrides.
strix/core/runner.py	Threads the presence of a configured API base into model-setting construction.
strix/report/state.py	Adds synchronized response-ID cost correlation and consumes exact streamed OpenRouter costs before falling back to estimation.
tests/test_cost_tracking.py	Covers OpenRouter cost extraction, stream correlation, cleanup, precedence, and LiteLLM provider resolution.
tests/test_inputs.py	Covers automatic and explicitly overridden required-tool-choice behavior across endpoint and provider combinations.

_{Reviews (1): Last reviewed commit: "fix(toolchoice): default required tool c..." | Re-trigger Greptile}