Ahmed Ibrahimandcopyberry 0c5720ea0f Keep environment tools stable across readiness changes (#54098) ...

## Why

Environment tool availability and selectors should remain stable as selected environments become ready.

## What changed

- Keep configured environment tools advertised even when no execution environment is ready, and derive `environment_id` selectors from all selected environments.
- Return guidance to wait when an environment is unavailable, while preserving errors for unknown environment IDs. Require a usable primary environment for `write_stdin`.
- Always include `shell` and `login` in the `exec_command` schema and mark `stable_environment_tools` as removed.

## Testing

Update integration tests to expect environment tools with empty or starting environments, and remove explicit feature opt-ins from affected scenarios.

GitOrigin-RevId: 1590c1b5be16a39e4a370663c552b881602545b5

2026-10-14 21:06:42 +00:00

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Preserve running turn recovery across thread settings updates (#53879)

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all__suite__scenarios__agent_eviction__idle_eviction_followup.snap

Add scenario coverage for worker context across idle eviction (#52062)

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all__suite__scenarios__agent_message_board__agent_message_board_context.snap

Add optional descriptions to agent message board channels (#52183)

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Stabilize write ordering in the shared message board scenario (#53632)

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Deliver remote message board notifications to active turns (#49686)

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Expose message board permissions and structured denials (#52568)

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Wire background compaction into the turn lifecycle (#53800)

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Add an optional JSON transcript format for Guardian (#51465)

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Keep Code Mode tool discovery guidance stable across catalog changes (#50562)

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Load persisted sender context for Guardian reviews (#51734)

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Emit one developer notice per incremental namespace update batch (#52295)

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Allow model catalogs to override incremental tool notices (#52736)

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Emit one developer notice per incremental namespace update batch (#52295)

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Support model-specific function description prefixes (#51930)

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Add experimental prediction forks that inherit parent context (#51884)

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Keep environment tools stable across readiness changes (#54098)

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