McpProtocol class

MCP Protocol Version constants and definitions

Annotations

• @immutable

Constructors

McpProtocol()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

isSupported(String version) → bool

Check if a version is supported

negotiate(List<String> clientVersions, List<String> serverVersions) → String?

Get the highest compatible version between client and server

negotiateWithDateFallback(String? clientVersion, List<String> serverVersions) → String?

Advanced version negotiation with date-based compatibility

requiresProtocolHeader(String version) → bool

Whether the negotiated version understands the MCP-Protocol-Version HTTP header (mandatory after negotiation from 2025-06-18 onwards).

supportsBatching(String version) → bool

Whether the negotiated version supports JSON-RPC batching. Removed in 2025-06-18 (PR #416).

supportsElicitation(String version) → bool

Whether the negotiated version knows the elicitation/create server → client request (introduced in 2025-06-18).

supportsIconsAndSamplingTools(String version) → bool

Whether the negotiated version understands Tool.icons, sampling tools / toolChoice, and URL-mode elicitation (introduced in 2025-11-25).

supportsStructuredToolOutput(String version) → bool

Whether the negotiated version understands Tool.outputSchema, CallToolResult.structuredContent, and resource_link content (introduced in 2025-06-18).

Constants

errorMethodNotFound → const int

jsonRpcVersion → const String

latest → const String

methodCallTool → const String

methodComplete → const String

methodGetPrompt → const String

methodInitialize → const String

methodInitialized → const String

methodListPrompts → const String

methodListResources → const String

methodListTools → const String

methodReadResource → const String

supportedVersions → const List<String>

All supported versions in order of preference (newest first)

v2024_11_05 → const String

v2025_03_26 → const String

v2025_06_18 → const String

v2025_11_25 → const String