2ca96f548bCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
56 lines
2.7 KiB
C#
56 lines
2.7 KiB
C#
namespace ModelContextProtocol.Protocol;
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/// <summary>
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/// Provides constants for well-known <c>_meta</c> field keys defined by the MCP protocol and its extensions.
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/// </summary>
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public static class MetaKeys
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{
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/// <summary>
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/// The metadata key used to carry the MCP protocol version in a request's <c>_meta</c> field.
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/// </summary>
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/// <remarks>
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/// Introduced by the 2026-07-28 protocol revision (SEP-2575). For HTTP transports, the value MUST
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/// match the <c>MCP-Protocol-Version</c> header. Servers reject a header/body mismatch with
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/// <see cref="McpErrorCode.HeaderMismatch"/>.
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/// </remarks>
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public const string ProtocolVersion = "io.modelcontextprotocol/protocolVersion";
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/// <summary>
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/// The metadata key used to identify the client software in a request's <c>_meta</c> field.
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/// </summary>
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/// <remarks>
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/// Introduced by the 2026-07-28 protocol revision (SEP-2575). Carries an <see cref="Protocol.Implementation"/>
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/// describing the client; replaces the <c>clientInfo</c> previously sent only with <c>initialize</c>.
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/// </remarks>
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public const string ClientInfo = "io.modelcontextprotocol/clientInfo";
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/// <summary>
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/// The metadata key used to declare client capabilities in a request's <c>_meta</c> field.
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/// </summary>
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/// <remarks>
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/// Introduced by the 2026-07-28 protocol revision (SEP-2575). Carries a <see cref="Protocol.ClientCapabilities"/>
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/// describing what optional features the client supports for this specific request. Servers MUST NOT
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/// infer capabilities from previous requests.
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/// </remarks>
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public const string ClientCapabilities = "io.modelcontextprotocol/clientCapabilities";
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/// <summary>
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/// The metadata key used to specify the desired log level for a request's resulting log notifications.
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/// </summary>
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/// <remarks>
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/// Introduced by the 2026-07-28 protocol revision (SEP-2575). Carries a <see cref="Protocol.LoggingLevel"/>.
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/// Replaces the legacy <see cref="RequestMethods.LoggingSetLevel"/> RPC. When absent, the server
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/// MUST NOT send log notifications for the request.
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/// </remarks>
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public const string LogLevel = "io.modelcontextprotocol/logLevel";
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/// <summary>
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/// The metadata key used to associate a notification with the request ID of an active
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/// <see cref="RequestMethods.SubscriptionsListen"/> subscription.
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/// </summary>
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/// <remarks>
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/// Introduced by the 2026-07-28 protocol revision (SEP-2575). Allows clients to demultiplex notifications
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/// belonging to different subscriptions on a shared channel (especially STDIO).
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/// </remarks>
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public const string SubscriptionId = "io.modelcontextprotocol/subscriptionId";
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}
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