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Your Sigil is one verified identity. You can put more than one agent behind it, and each one is kept separate.
1

Connect each agent

Every MCP connection you add — Claude, ChatGPT, or anything else — gets its own agent identity the moment it first connects, under your Sigil. The CLI works differently: signing in with sumvin login authenticates you directly, rather than registering a separate connector identity.
2

Each identity is separate

A connected agent can only see its own identity, not a list of every agent you’ve connected. Ask any one of them:
“Show me your agent identity.”
and it reports its own key and registration status (the tool behind this is agent_identity_show) — nothing about any other agent you’ve connected.
3

Mandates belong to you

A Stamped Mandate belongs to your account, not to the agent that asked for it. Revoking one mandate doesn’t touch your others. Disconnecting an agent doesn’t revoke the mandates it asked for: they stay valid until they expire or you revoke them. See Revoke a mandate or disconnect an agent.
Before you approve a new mandate, check which mandates are already in place.
Coming soon: a single list of every agent connected to your account. Today, each agent can show you only its own identity.

See also

Try asking your agent: “Show me your agent identity.”