Alter Meridian Pty Ltd Independent This memo specifies the briefing-and-binding envelope: a delivery contract for the wire-level structure by which an artificial- intelligence agent surfaces a consequential decision to the human principal it acts for, and by which the principal commits, declines, amends, or rejects that decision. The envelope carries eight named slots (a synopsis, findings, recommendations, an offer of detail, a question stem, a set of options each marked with its own reasoning, a single recommended option, and a pair of escape hatches) and is emitted as a structured field of a Model Context Protocol tool result. The envelope is renderer-agnostic, so the briefing an agent delivers and the binding a principal commits back have one machine- checkable shape across every consuming surface. The memo also specifies a dual-veto handshake: one escape hatch lets the principal revise the answer space while accepting the question; the other lets the principal reject the question itself and reopen deliberation. Either party may veto. The memo defines a content digest over the envelope, canonicalized under JCS and hashed with SHA-256, so that a resolution names the exact envelope it resolves and an external receipt can reference that envelope by digest. The memo is Informational. No new transport is introduced; the envelope composes with the handle namespace of draft-morrison-identity-pronouns and the MCP tool surface of draft-morrison-org-alter-policy-provision.