output_model_schema describes the final task result (e.g. {summary, step_results}).
Auto-copying it into every extract call (added Feb 2026) asks the model to produce
the whole-task shape from a single page, and on the browser-use gateway routes the
extract sub-call through the agent action protocol, which breaks it (client
KeyError 'action'). Per-page extract now uses a schema only when the caller passes
extraction_schema explicitly; free-text extraction is the default again.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
ChatBrowserUse now accepts provider-prefixed model ids (anthropic/*,
openai/*, google/*) alongside the bu-* aliases and browser-use/* models,
so a single BROWSER_USE_API_KEY can reach them. bu-* aliases and the
bu-latest -> bu-2-0 normalization are unchanged; bare ids are rejected
with guidance toward the provider/model form.
Also matches provider-prefixed Claude Sonnet ids in the Agent
llm_screenshot_size auto-config, so the screenshot optimization isn't
lost when Claude is reached via ChatBrowserUse.
Adds an example, a README FAQ entry, and tests.
ENG-5060
- fable for coord clicks
- explicit support
- model refusal response
- fable pricing with 5m/1h cache writes and inference geo multiplier
- anthropic fallback, thinking, output config, and inference geo request support
JayLay0310