Lifecycle changedspecification/2025-11-25/basic/lifecycle
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11# Lifecycle
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3<div id="enable-section-numbers" />
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53The Model Context Protocol (MCP) defines a rigorous lifecycle for client-server
64connections that ensures proper capability negotiation and state management.
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172170If the client does not support the version in the server's response, it **SHOULD**
173171disconnect.
174172
175<Note>
176 If using HTTP, the client **MUST** include the `MCP-Protocol-Version: <protocol-version>` HTTP header on all subsequent requests to the MCP
177 server.
178 For details, see [the Protocol Version Header section in Transports](/specification/2025-11-25/basic/transports#protocol-version-header).
179</Note>
173> [!NOTE]
174>
175> If using HTTP, the client **MUST** include the `MCP-Protocol-Version: <protocol-version>` HTTP header on all subsequent requests to the MCP
176> server.
177> For details, see [the Protocol Version Header section in Transports](/specification/2025-11-25/basic/transports#protocol-version-header).
180178
181179#### Capability Negotiation
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