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v3 resolves its tool catalog from the authenticated account. Begin every new session with get_status and retain the returned account identity, enrollment state, blockers, and reachable accounts. Switch only to an accountId returned by get_status:
After switching, process notifications/tools/list_changed and call get_status again. The second read confirms which account is active even when the client did not refresh its catalog immediately. Omit accountId to return to the credential’s home account. Buyer and Seller accounts receive their account-specific tools when enrolled. Organisation accounts currently provide navigation and shared settings rather than an operational noun catalog.

Full account-access reference

Review customer relationships, role and permission behavior, and stable v2 account switching in the canonical account-access guide.