Lifecycle changedspecification/2025-06-18/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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132130If the client does not support the version in the server's response, it **SHOULD**
133131disconnect.
134132
135<Note>
136 If using HTTP, the client **MUST** include the `MCP-Protocol-Version: <protocol-version>` HTTP header on all subsequent requests to the MCP
137 server.
138 For details, see [the Protocol Version Header section in Transports](/specification/2025-06-18/basic/transports#protocol-version-header).
139</Note>
133> [!NOTE]
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135> If using HTTP, the client **MUST** include the `MCP-Protocol-Version: <protocol-version>` HTTP header on all subsequent requests to the MCP
136> server.
137> For details, see [the Protocol Version Header section in Transports](/specification/2025-06-18/basic/transports#protocol-version-header).
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141139#### Capability Negotiation
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