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A session is the negotiated contract binding an agent to an embodiment in a world. The world manifest is what makes AWP worlds self-describing: a generic agent discovers at runtime what bodies exist, what it can perceive, and what it can do — the same way an MCP client discovers tools. The agent manifest declares supported modalities and protocol versions so the world can tailor or reject. Negotiation always resolves to a subset: the world MAY grant fewer channels, action types, or looser rates than requested, and MUST say exactly what was granted in session.ready. Renegotiation mid-session uses the same messages. Normative rules: session lifecycle and negotiation.