Under the hood
Useful1 Signal2
The request that reads a session's plan-mode plan is now internal-only, off the documented control surface.
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What
The request that reads a session's current plan-mode plan is now flagged as internal, keeping it out of the documented control surface.
Evidence
@internal Read the session's current plan-mode plan.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.