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Limit sub-session models based on the main session model #3596

Description

@igolaizola

Feature summary

Allow users to prevent sub-sessions from using models that are more expensive than the model selected for the main session.

What problem are you trying to solve?

A Copilot session can launch sub-sessions that choose more expensive models than the one explicitly selected for the main session.

This makes usage costs unpredictable, especially in workflows that spawn multiple sub-sessions.

Proposed solution

Add a setting to limit sub-sessions to:

  • The same model as the parent session
  • The same model or cheaper models
  • Any model

The restriction should also apply recursively to nested sub-sessions.

Workflow impact

This would give users and teams better cost control while still allowing Copilot to choose models automatically within a defined limit.

Installation context

No response

Additional context

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Activity

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