@CryogenicPlanet2d ago
The playground-key → user binding is already enforced at session creation (session.ts — body.user_id must equal metadata.userId for INTERNAL_PLAYGROUND keys, added in #10452), so any session created via the playground flow already belongs to the key's bound user. We likely don't need to re-check on list-tools/execute.
The only scenario this guards is a playground key replaying a session_id from a session created by a different (e.g. DEVELOPER) key in the same project — but the playground key only ever lives in a dashboard member's vault, and that member already has full project access, so it isn't an escalation.