# `ACP.SessionInfoUpdate`
[🔗](https://github.com/f1729/agent-client-protocol-elixir/blob/main/lib/acp/unstable.ex#L808)

Update to session metadata. (Unstable)

Uses MaybeUndefined for fields to support partial updates:
- `:undefined` → field not included (no change)
- `nil` → explicitly null (clear the value)
- `{:value, v}` → set to v

# `from_json`
[🔗](https://github.com/f1729/agent-client-protocol-elixir/blob/main/lib/acp/unstable.ex#L840)

# `new`
[🔗](https://github.com/f1729/agent-client-protocol-elixir/blob/main/lib/acp/unstable.ex#L820)

# `to_json`
[🔗](https://github.com/f1729/agent-client-protocol-elixir/blob/main/lib/acp/unstable.ex#L822)

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*Consult [api-reference.md](api-reference.md) for complete listing*