bubus derives the default bus name from the class name, so the
ResilientEventBus default factory changed session bus names from
EventBus_* to ResilientEventBus_*, breaking the EventBus_ prefix contract
asserted in tests/ci/browser/test_session_start.py. Default the subclass
name back to EventBus_<id> when none is given (explicit names still honored).
The V2 worker reuses a keep_alive BrowserSession across warm Lambda
invocations. At the end of a run Agent.close() stops the session's event
bus and nulls out its async primitives (event_queue / _on_idle) to release
the event loop. On resume the worker can step() the bus before any
dispatch() restarts it, and stock bubus EventBus.step() asserts
"EventBus._start() must be called before step()" in that state — crashing
the run deterministically so the task dead-letters after max receives
(~1,600+ occurrences over 2 days).
Wrap the session's bus in a ResilientEventBus subclass whose step() and
wait_until_idle() are safe no-ops when the bus has not been started,
instead of asserting. The nulling stays (it's what lets the next dispatch()
recreate a fresh queue and _start() the bus), so a later dispatch() still
restarts the bus and processes events normally.
Fixes ENG-5280.
A flex item defaults to min-width:auto and won't shrink below its content,
so a long/unbroken URL in the default footer template overflowed and pushed
the page / totalPages span off the printable area. Give the url span
min-width:0 + overflow ellipsis so it truncates, and flex-shrink:0 on the
page-count span so it always renders. Adds a long-URL regression test.
Drop the bu-3 and bu-3-max model ids everywhere they were surfaced:
- ChatBrowserUse no longer lists them as valid bu-* aliases (provider-prefixed
ids like openai/gpt-5.5 are still accepted by the gateway).
- Remove their custom pricing entries and the README pricing blocks.
- Update docstrings, README quickstart, and the beta_agent example to use
openai/gpt-5.5 as the default, with bu-2-0 shown as a commented alternative.
- Drop the tests that asserted bu-3/bu-3-max acceptance and pricing.
The save_as_pdf action now renders page metadata into the PDF margins by
default, matching Chrome's Print dialog: the date in the header and the page
URL plus page numbers in the footer.
- Add display_header_footer (default True), header_template, and
footer_template params to SaveAsPdfAction.
- Pass displayHeaderFooter + header/footer templates and explicit margins to
CDP Page.printToPDF so the metadata has room to render (Chrome clips it
otherwise, and defaults header/footer font-size to 0px).
- Default templates show the date / URL + page numbers; callers can override
with custom HTML or disable entirely for a clean PDF.
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
Laith Weinberger