fix(codex): restore collaborative browser handoff - #436
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Codex 5.6 Code Mode can defer MCP tools without exposing tool_search, leaving them reachable only through ALL_TOOLS. Teach T3's Codex instructions to use that fallback before declaring browser collaboration unavailable. Model: gpt-5.6-sol Harness: T3 Code Codex
patroza
marked this pull request as ready for review
September 1, 2026 08:26
Do not report preview_open as ready when the requested floating preview has not actually attached to a visible browser surface. Model: GPT-5.6 Sol\nHarness: Codex via T3 Code
patroza
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Summary
ALL_TOOLSpreview_openreports successRoot cause
Two independent gaps compounded. Codex 5.6 Code Mode currently omits the normal deferred
tool_searchprimitive even though T3 preview tools remain callable throughALL_TOOLS, and T3 did not document that fallback. After discovery, T3 could create a desktop webview and return its tab metadata whilevisibleremained false because readiness only checked the automation bridge. Claude Code is unaffected by the discovery gap because its MCP tools are exposed normally.The captured turn demonstrated the second gap directly:
preview_openreturnedtab_1, the iCloud URL and title, andvisible: false; subsequent snapshot and evaluate operations failed. The agent therefore knew the backing tab existed, but no browser surface had attached to the thread.Validation
vp test run apps/server/src/provider/Layers/CodexSessionRuntime.test.ts(39 passed)vp test run apps/web/src/components/preview/previewAutomationOpenReadiness.test.ts(10 passed)