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## Why Running root threads retained their startup global instructions, so edits to global `AGENTS.md` files did not take effect during an active session. ## What changed - Reload global instructions when capturing model-request context, including after tools within the same turn. Apply changes without repeating unchanged instructions or rediscovering repository instructions when the environment and trust level are unchanged. - Preserve the last successful global instructions on read failures, suppress recurring warnings until recovery, and clear instructions when their source is removed or blank. - Serialize refreshes and allow cancellation without blocking subsequent requests. - Give new subagents the parent's applied instruction snapshot and update Guardian reviewer reuse to account for refreshed instructions. ## Testing Add regression coverage for live edits and removal, read failures and recovery, warning suppression, cancellation, subagent inheritance, and Guardian reviewer reuse. Update resume, fork, and compaction tests to verify refreshed instructions. GitOrigin-RevId: f7e9b399740fa4f45e482c070f6e901ee7cf85cd