- **Source build portability:** keep tsdown configuration self-contained so builds do not depend on resolving the tsdown package from unrun's temporary module directory.

- **Diffs rendering:** render viewer and image output from one SSR preload, preserve language-pack highlighting through hydration, normalize language hints case-insensitively, skip identical before/after inputs with an explicit `changed` result, report truthful file-render and input errors, cache hash-pinned viewer runtimes, and prefer canonical file settings over stale aliases. (#100487)

- **Remote browser reliability:** bound persistent Playwright tab enumeration by the existing remote CDP timeout budget and retire timed-out connection attempts so late completions cannot restore a stuck connection. (#80147, #58968) Thanks @HemantSudarshan and @KeaneYan.

- **MCP OAuth response bounds:** reject body-less foreign error bodies without calling their inherently unbounded `text()` fallback, while preserving HTTP status and headers for safe SDK diagnostics. (#98143) Thanks @Pick-cat.

- **Control UI approval prompts:** keep stale resolve failures and busy-state cleanup from leaking across newer approvals or Gateway reconnects. (#98394) Thanks @haruaiclone-droid.

- **Agent empty replies:** surface a visible failure when a completed interactive turn has no deliverable reply, including queued follow-ups, while preserving explicit silence, pending continuations, and committed side effects, honoring queued send policies, and treating compaction notices as progress. (#100456) Thanks @mushuiyu886.