Can I connect the same template twice, with two different keys? No — each template allows a single connection per account. If you genuinely need a second account for the same service, bring it in as a second Custom server (Manual 26, section 8).
Who sees the tools I turn on? Any agent with access to that resource — “Access to everything”, or one of the server’s tags if you set any (Manual 23 · AI agents, section 6) — same as with a Custom server.
Can I see my key again after connecting it? No, never — not you, not anyone on your provider’s team. If you need to change it, disconnect and reconnect with the new key (section 7).
Is there a “via third party” (meta-provider) level? No. The catalog has three levels (A, B and C) and there’s no intermediary between your account and the provider: every server connects directly with the credential or session you authorize. New integrations are added to the catalog progressively, one by one, after being verified.