Guard the tool-pair validator when transformed assistant messages belong to a tracked subagent session, while keeping normal main-session orphaned tool_use repair intact.
Constraint: code-yeongyu/oh-my-openagent#3996 reports background Oracle sessions hanging after synthetic placeholder tool_result insertion.
Rejected: disable tool-pair-validator globally | would regress main-session compaction/orphaned tool_use repair.
Confidence: high
Scope-risk: narrow
Directive: Keep subagent skip coverage and normal repair coverage together when changing tool-pair validation.
Tested: bun test src/hooks/tool-pair-validator/hook.test.ts src/plugin/messages-transform.test.ts
Tested: bun run typecheck
Not-tested: live Oracle background task e2e; no remote push or PR comment performed.
PeterPonyu
17030b9a0d