Subagents invoked with excessive instructions conflicting with their own

### Describe the bug

- Given the custom agents implementing orchestration pattern
- When the orchestrator agent clearly instructed to give the instruction X to subagent
- Then it completely ignores it and produces excessive and reinterpreted instructions
- As a result the subagent is confused as it often gets contradictory instructions from coordinator and looses focus on its own instructions

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

Running subagents should be strict as instructions given to the parent agent

### Additional context

_No response_

No file, test, or entry point is named. Start by reproducing the behavior with custom agents and an orchestrator instruction, then trace the subagent orchestration path; done means subagents follow the parent’s instruction without contradictory or excessive reinterpretation.

Rédigé par le modèle d'indexation à partir du texte de l'issue.