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feat(mcp): export initialized result in client session (#320)

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Export ServerCapabilities and related subtypes and update protocol,
server, and tests to use exported types. Add InitializeResult method on
ClientSession for accessing the initialize result from sessions.

Fixes: https://github.com/modelcontextprotocol/go-sdk/issues/166

Co-authored-by: Shashank Pachava <spachava753@gmail.com>
This commit is contained in:
Matt L 2025-08-18 14:49:02 -04:00 • committed by GitHub
commit 75f9999590
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1 changed files with 64 additions and 57 deletions
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24
mcp/protocol.go
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@ -338,7 +338,7 @@ type InitializeResult struct {
// This property is reserved by the protocol to allow clients and servers to
// attach additional metadata to their responses.
Meta `json:"_meta,omitempty"`
Capabilities *serverCapabilities `json:"capabilities"`
Capabilities *ServerCapabilities `json:"capabilities"`
// Instructions describing how to use the server and its features.
//
// This can be used by clients to improve the LLM's understanding of available
@ -971,19 +971,19 @@ type Implementation struct {
}
// Present if the server supports argument autocompletion suggestions.
type completionCapabilities struct{}
type CompletionCapabilities struct{}
// Present if the server supports sending log messages to the client.
type loggingCapabilities struct{}
type LoggingCapabilities struct{}
// Present if the server offers any prompt templates.
type promptCapabilities struct {
type PromptCapabilities struct {
// Whether this server supports notifications for changes to the prompt list.
ListChanged bool `json:"listChanged,omitempty"`
}
// Present if the server offers any resources to read.
type resourceCapabilities struct {
type ResourceCapabilities struct {
// Whether this server supports notifications for changes to the resource list.
ListChanged bool `json:"listChanged,omitempty"`
// Whether this server supports subscribing to resource updates.
@ -993,23 +993,23 @@ type resourceCapabilities struct {
// Capabilities that a server may support. Known capabilities are defined here,
// in this schema, but this is not a closed set: any server can define its own,
// additional capabilities.
type serverCapabilities struct {
type ServerCapabilities struct {
// Present if the server supports argument autocompletion suggestions.
Completions *completionCapabilities `json:"completions,omitempty"`
Completions *CompletionCapabilities `json:"completions,omitempty"`
// Experimental, non-standard capabilities that the server supports.
Experimental map[string]struct{} `json:"experimental,omitempty"`
// Present if the server supports sending log messages to the client.
Logging *loggingCapabilities `json:"logging,omitempty"`
Logging *LoggingCapabilities `json:"logging,omitempty"`
// Present if the server offers any prompt templates.
Prompts *promptCapabilities `json:"prompts,omitempty"`
Prompts *PromptCapabilities `json:"prompts,omitempty"`
// Present if the server offers any resources to read.
Resources *resourceCapabilities `json:"resources,omitempty"`
Resources *ResourceCapabilities `json:"resources,omitempty"`
// Present if the server offers any tools to call.
Tools *toolCapabilities `json:"tools,omitempty"`
Tools *ToolCapabilities `json:"tools,omitempty"`
}
// Present if the server offers any tools to call.
type toolCapabilities struct {
type ToolCapabilities struct {
// Whether this server supports notifications for changes to the tool list.
ListChanged bool `json:"listChanged,omitempty"`
}