go-sdk/mcp/protocol.go

// Copyright 2025 The Go MCP SDK Authors. All rights reserved.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.

// Code generated by generate.go. DO NOT EDIT.

package mcp

import (
	"github.com/modelcontextprotocol/go-sdk/jsonschema"
)

// Optional annotations for the client. The client can use annotations to inform
// how objects are used or displayed
type Annotations struct {
	// Describes who the intended customer of this object or data is.
	//
	// It can include multiple entries to indicate content useful for multiple
	// audiences (e.g., `["user", "assistant"]`).
	Audience []Role `json:"audience,omitempty"`
	// Describes how important this data is for operating the server.
	//
	// A value of 1 means "most important," and indicates that the data is
	// effectively required, while 0 means "least important," and indicates that the
	// data is entirely optional.
	Priority float64 `json:"priority,omitempty"`
}

type CallToolParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta      Meta   `json:"_meta,omitempty"`
	Arguments any    `json:"arguments,omitempty"`
	Name      string `json:"name"`
}

func (x *CallToolParams) GetMeta() *Meta { return &x.Meta }

type CallToolParamsFor[In any] struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta      Meta   `json:"_meta,omitempty"`
	Arguments In     `json:"arguments,omitempty"`
	Name      string `json:"name"`
}

func (x *CallToolParamsFor[In]) GetMeta() *Meta { return &x.Meta }

// The server's response to a tool call.
//
// Any errors that originate from the tool SHOULD be reported inside the result
// object, with `isError` set to true, _not_ as an MCP protocol-level error
// response. Otherwise, the LLM would not be able to see that an error occurred
// and self-correct.
//
// However, any errors in _finding_ the tool, an error indicating that the
// server does not support tool calls, or any other exceptional conditions,
// should be reported as an MCP error response.
type CallToolResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta    Meta       `json:"_meta,omitempty"`
	Content []*Content `json:"content"`
	// Whether the tool call ended in an error.
	//
	// If not set, this is assumed to be false (the call was successful).
	IsError bool `json:"isError,omitempty"`
}

func (x *CallToolResult) GetMeta() *Meta { return &x.Meta }

type CallToolResultFor[Out any] struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta    Meta       `json:"_meta,omitempty"`
	Content []*Content `json:"content"`
	// Whether the tool call ended in an error.
	//
	// If not set, this is assumed to be false (the call was successful).
	IsError bool `json:"isError,omitempty"`
}

func (x *CallToolResultFor[Out]) GetMeta() *Meta { return &x.Meta }

type CancelledParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An optional string describing the reason for the cancellation. This MAY be
	// logged or presented to the user.
	Reason string `json:"reason,omitempty"`
	// The ID of the request to cancel.
	//
	// This MUST correspond to the ID of a request previously issued in the same
	// direction.
	RequestID any `json:"requestId"`
}

func (x *CancelledParams) GetMeta() *Meta { return &x.Meta }

// Capabilities a client may support. Known capabilities are defined here, in
// this schema, but this is not a closed set: any client can define its own,
// additional capabilities.
type ClientCapabilities struct {
	// Experimental, non-standard capabilities that the client supports.
	Experimental map[string]struct {
	} `json:"experimental,omitempty"`
	// Present if the client supports listing roots.
	Roots struct {
		// Whether the client supports notifications for changes to the roots list.
		ListChanged bool `json:"listChanged,omitempty"`
	} `json:"roots,omitempty"`
	// Present if the client supports sampling from an LLM.
	Sampling *SamplingCapabilities `json:"sampling,omitempty"`
}

type CreateMessageParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// A request to include context from one or more MCP servers (including the
	// caller), to be attached to the prompt. The client MAY ignore this request.
	IncludeContext string `json:"includeContext,omitempty"`
	// The maximum number of tokens to sample, as requested by the server. The
	// client MAY choose to sample fewer tokens than requested.
	MaxTokens int64              `json:"maxTokens"`
	Messages  []*SamplingMessage `json:"messages"`
	// Optional metadata to pass through to the LLM provider. The format of this
	// metadata is provider-specific.
	Metadata struct {
	} `json:"metadata,omitempty"`
	// The server's preferences for which model to select. The client MAY ignore
	// these preferences.
	ModelPreferences *ModelPreferences `json:"modelPreferences,omitempty"`
	StopSequences    []string          `json:"stopSequences,omitempty"`
	// An optional system prompt the server wants to use for sampling. The client
	// MAY modify or omit this prompt.
	SystemPrompt string  `json:"systemPrompt,omitempty"`
	Temperature  float64 `json:"temperature,omitempty"`
}

func (x *CreateMessageParams) GetMeta() *Meta { return &x.Meta }

// The client's response to a sampling/create_message request from the server.
// The client should inform the user before returning the sampled message, to
// allow them to inspect the response (human in the loop) and decide whether to
// allow the server to see it.
type CreateMessageResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta    Meta     `json:"_meta,omitempty"`
	Content *Content `json:"content"`
	// The name of the model that generated the message.
	Model string `json:"model"`
	Role  Role   `json:"role"`
	// The reason why sampling stopped, if known.
	StopReason string `json:"stopReason,omitempty"`
}

func (x *CreateMessageResult) GetMeta() *Meta { return &x.Meta }

type GetPromptParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// Arguments to use for templating the prompt.
	Arguments map[string]string `json:"arguments,omitempty"`
	// The name of the prompt or prompt template.
	Name string `json:"name"`
}

func (x *GetPromptParams) GetMeta() *Meta { return &x.Meta }

// The server's response to a prompts/get request from the client.
type GetPromptResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An optional description for the prompt.
	Description string           `json:"description,omitempty"`
	Messages    []*PromptMessage `json:"messages"`
}

func (x *GetPromptResult) GetMeta() *Meta { return &x.Meta }

type InitializeParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta         Meta                `json:"_meta,omitempty"`
	Capabilities *ClientCapabilities `json:"capabilities"`
	ClientInfo   *implementation     `json:"clientInfo"`
	// The latest version of the Model Context Protocol that the client supports.
	// The client MAY decide to support older versions as well.
	ProtocolVersion string `json:"protocolVersion"`
}

func (x *InitializeParams) GetMeta() *Meta { return &x.Meta }

// After receiving an initialize request from the client, the server sends this
// response.
type InitializeResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta         Meta                `json:"_meta,omitempty"`
	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
	// tools, resources, etc. It can be thought of like a "hint" to the model. For
	// example, this information MAY be added to the system prompt.
	Instructions string `json:"instructions,omitempty"`
	// The version of the Model Context Protocol that the server wants to use. This
	// may not match the version that the client requested. If the client cannot
	// support this version, it MUST disconnect.
	ProtocolVersion string          `json:"protocolVersion"`
	ServerInfo      *implementation `json:"serverInfo"`
}

func (x *InitializeResult) GetMeta() *Meta { return &x.Meta }

type InitializedParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
}

func (x *InitializedParams) GetMeta() *Meta { return &x.Meta }

type ListPromptsParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the current pagination position. If provided,
	// the server should return results starting after this cursor.
	Cursor string `json:"cursor,omitempty"`
}

func (x *ListPromptsParams) GetMeta() *Meta     { return &x.Meta }
func (x *ListPromptsParams) cursorPtr() *string { return &x.Cursor }

// The server's response to a prompts/list request from the client.
type ListPromptsResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the pagination position after the last returned
	// result. If present, there may be more results available.
	NextCursor string    `json:"nextCursor,omitempty"`
	Prompts    []*Prompt `json:"prompts"`
}

func (x *ListPromptsResult) GetMeta() *Meta         { return &x.Meta }
func (x *ListPromptsResult) nextCursorPtr() *string { return &x.NextCursor }

type ListResourceTemplatesParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the current pagination position. If provided,
	// the server should return results starting after this cursor.
	Cursor string `json:"cursor,omitempty"`
}

func (x *ListResourceTemplatesParams) GetMeta() *Meta     { return &x.Meta }
func (x *ListResourceTemplatesParams) cursorPtr() *string { return &x.Cursor }

// The server's response to a resources/templates/list request from the client.
type ListResourceTemplatesResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the pagination position after the last returned
	// result. If present, there may be more results available.
	NextCursor        string              `json:"nextCursor,omitempty"`
	ResourceTemplates []*ResourceTemplate `json:"resourceTemplates"`
}

func (x *ListResourceTemplatesResult) GetMeta() *Meta         { return &x.Meta }
func (x *ListResourceTemplatesResult) nextCursorPtr() *string { return &x.NextCursor }

type ListResourcesParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the current pagination position. If provided,
	// the server should return results starting after this cursor.
	Cursor string `json:"cursor,omitempty"`
}

func (x *ListResourcesParams) GetMeta() *Meta     { return &x.Meta }
func (x *ListResourcesParams) cursorPtr() *string { return &x.Cursor }

// The server's response to a resources/list request from the client.
type ListResourcesResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the pagination position after the last returned
	// result. If present, there may be more results available.
	NextCursor string      `json:"nextCursor,omitempty"`
	Resources  []*Resource `json:"resources"`
}

func (x *ListResourcesResult) GetMeta() *Meta         { return &x.Meta }
func (x *ListResourcesResult) nextCursorPtr() *string { return &x.NextCursor }

type ListRootsParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
}

func (x *ListRootsParams) GetMeta() *Meta { return &x.Meta }

// The client's response to a roots/list request from the server. This result
// contains an array of Root objects, each representing a root directory or file
// that the server can operate on.
type ListRootsResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta  Meta    `json:"_meta,omitempty"`
	Roots []*Root `json:"roots"`
}

func (x *ListRootsResult) GetMeta() *Meta { return &x.Meta }

type ListToolsParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the current pagination position. If provided,
	// the server should return results starting after this cursor.
	Cursor string `json:"cursor,omitempty"`
}

func (x *ListToolsParams) GetMeta() *Meta     { return &x.Meta }
func (x *ListToolsParams) cursorPtr() *string { return &x.Cursor }

// The server's response to a tools/list request from the client.
type ListToolsResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// An opaque token representing the pagination position after the last returned
	// result. If present, there may be more results available.
	NextCursor string  `json:"nextCursor,omitempty"`
	Tools      []*Tool `json:"tools"`
}

func (x *ListToolsResult) GetMeta() *Meta         { return &x.Meta }
func (x *ListToolsResult) nextCursorPtr() *string { return &x.NextCursor }

// The severity of a log message.
//
// These map to syslog message severities, as specified in RFC-5424:
// https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1
type LoggingLevel string

type LoggingMessageParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// The data to be logged, such as a string message or an object. Any JSON
	// serializable type is allowed here.
	Data any `json:"data"`
	// The severity of this log message.
	Level LoggingLevel `json:"level"`
	// An optional name of the logger issuing this message.
	Logger string `json:"logger,omitempty"`
}

func (x *LoggingMessageParams) GetMeta() *Meta { return &x.Meta }

// Hints to use for model selection.
//
// Keys not declared here are currently left unspecified by the spec and are up
// to the client to interpret.
type ModelHint struct {
	// A hint for a model name.
	//
	// The client SHOULD treat this as a substring of a model name; for example: -
	// `claude-3-5-sonnet` should match `claude-3-5-sonnet-20241022` - `sonnet`
	// should match `claude-3-5-sonnet-20241022`, `claude-3-sonnet-20240229`, etc. -
	// `claude` should match any Claude model
	//
	// The client MAY also map the string to a different provider's model name or a
	// different model family, as long as it fills a similar niche; for example: -
	// `gemini-1.5-flash` could match `claude-3-haiku-20240307`
	Name string `json:"name,omitempty"`
}

// The server's preferences for model selection, requested of the client during
// sampling.
//
// Because LLMs can vary along multiple dimensions, choosing the "best" model is
// rarely straightforward. Different models excel in different areas—some are
// faster but less capable, others are more capable but more expensive, and so
// on. This interface allows servers to express their priorities across multiple
// dimensions to help clients make an appropriate selection for their use case.
//
// These preferences are always advisory. The client MAY ignore them. It is also
// up to the client to decide how to interpret these preferences and how to
// balance them against other considerations.
type ModelPreferences struct {
	// How much to prioritize cost when selecting a model. A value of 0 means cost
	// is not important, while a value of 1 means cost is the most important factor.
	CostPriority float64 `json:"costPriority,omitempty"`
	// Optional hints to use for model selection.
	//
	// If multiple hints are specified, the client MUST evaluate them in order (such
	// that the first match is taken).
	//
	// The client SHOULD prioritize these hints over the numeric priorities, but MAY
	// still use the priorities to select from ambiguous matches.
	Hints []*ModelHint `json:"hints,omitempty"`
	// How much to prioritize intelligence and capabilities when selecting a model.
	// A value of 0 means intelligence is not important, while a value of 1 means
	// intelligence is the most important factor.
	IntelligencePriority float64 `json:"intelligencePriority,omitempty"`
	// How much to prioritize sampling speed (latency) when selecting a model. A
	// value of 0 means speed is not important, while a value of 1 means speed is
	// the most important factor.
	SpeedPriority float64 `json:"speedPriority,omitempty"`
}

type PingParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
}

func (x *PingParams) GetMeta() *Meta { return &x.Meta }

// A prompt or prompt template that the server offers.
type Prompt struct {
	// A list of arguments to use for templating the prompt.
	Arguments []*PromptArgument `json:"arguments,omitempty"`
	// An optional description of what this prompt provides
	Description string `json:"description,omitempty"`
	// The name of the prompt or prompt template.
	Name string `json:"name"`
}

// Describes an argument that a prompt can accept.
type PromptArgument struct {
	// A human-readable description of the argument.
	Description string `json:"description,omitempty"`
	// The name of the argument.
	Name string `json:"name"`
	// Whether this argument must be provided.
	Required bool `json:"required,omitempty"`
}

type PromptListChangedParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
}

func (x *PromptListChangedParams) GetMeta() *Meta { return &x.Meta }

// Describes a message returned as part of a prompt.
//
// This is similar to `SamplingMessage`, but also supports the embedding of
// resources from the MCP server.
type PromptMessage struct {
	Content *Content `json:"content"`
	Role    Role     `json:"role"`
}

type ReadResourceParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// The URI of the resource to read. The URI can use any protocol; it is up to
	// the server how to interpret it.
	URI string `json:"uri"`
}

func (x *ReadResourceParams) GetMeta() *Meta { return &x.Meta }

// The server's response to a resources/read request from the client.
type ReadResourceResult struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta     Meta                `json:"_meta,omitempty"`
	Contents []*ResourceContents `json:"contents"`
}

func (x *ReadResourceResult) GetMeta() *Meta { return &x.Meta }

// A known resource that the server is capable of reading.
type Resource struct {
	// Optional annotations for the client.
	Annotations *Annotations `json:"annotations,omitempty"`
	// A description of what this resource represents.
	//
	// This can be used by clients to improve the LLM's understanding of available
	// resources. It can be thought of like a "hint" to the model.
	Description string `json:"description,omitempty"`
	// The MIME type of this resource, if known.
	MIMEType string `json:"mimeType,omitempty"`
	// A human-readable name for this resource.
	//
	// This can be used by clients to populate UI elements.
	Name string `json:"name"`
	// The size of the raw resource content, in bytes (i.e., before base64 encoding
	// or any tokenization), if known.
	//
	// This can be used by Hosts to display file sizes and estimate context window
	// usage.
	Size int64 `json:"size,omitempty"`
	// The URI of this resource.
	URI string `json:"uri"`
}

type ResourceListChangedParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
}

func (x *ResourceListChangedParams) GetMeta() *Meta { return &x.Meta }

// A template description for resources available on the server.
type ResourceTemplate struct {
	// Optional annotations for the client.
	Annotations *Annotations `json:"annotations,omitempty"`
	// A description of what this template is for.
	//
	// This can be used by clients to improve the LLM's understanding of available
	// resources. It can be thought of like a "hint" to the model.
	Description string `json:"description,omitempty"`
	// The MIME type for all resources that match this template. This should only be
	// included if all resources matching this template have the same type.
	MIMEType string `json:"mimeType,omitempty"`
	// A human-readable name for the type of resource this template refers to.
	//
	// This can be used by clients to populate UI elements.
	Name string `json:"name"`
	// A URI template (according to RFC 6570) that can be used to construct resource
	// URIs.
	URITemplate string `json:"uriTemplate"`
}

// The sender or recipient of messages and data in a conversation.
type Role string

// Represents a root directory or file that the server can operate on.
type Root struct {
	// An optional name for the root. This can be used to provide a human-readable
	// identifier for the root, which may be useful for display purposes or for
	// referencing the root in other parts of the application.
	Name string `json:"name,omitempty"`
	// The URI identifying the root. This *must* start with file:// for now. This
	// restriction may be relaxed in future versions of the protocol to allow other
	// URI schemes.
	URI string `json:"uri"`
}

type RootsListChangedParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
}

func (x *RootsListChangedParams) GetMeta() *Meta { return &x.Meta }

// Present if the client supports sampling from an LLM.
type SamplingCapabilities struct {
}

// Describes a message issued to or received from an LLM API.
type SamplingMessage struct {
	Content *Content `json:"content"`
	Role    Role     `json:"role"`
}

type SetLevelParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
	// The level of logging that the client wants to receive from the server. The
	// server should send all logs at this level and higher (i.e., more severe) to
	// the client as notifications/message.
	Level LoggingLevel `json:"level"`
}

func (x *SetLevelParams) GetMeta() *Meta { return &x.Meta }

// Definition for a tool the client can call.
type Tool struct {
	// Optional additional tool information.
	Annotations *ToolAnnotations `json:"annotations,omitempty"`
	// A human-readable description of the tool.
	//
	// This can be used by clients to improve the LLM's understanding of available
	// tools. It can be thought of like a "hint" to the model.
	Description string `json:"description,omitempty"`
	// A JSON Schema object defining the expected parameters for the tool.
	InputSchema *jsonschema.Schema `json:"inputSchema"`
	// The name of the tool.
	Name string `json:"name"`
}

// Additional properties describing a Tool to clients.
//
// NOTE: all properties in ToolAnnotations are **hints**. They are not
// guaranteed to provide a faithful description of tool behavior (including
// descriptive properties like `title`).
//
// Clients should never make tool use decisions based on ToolAnnotations
// received from untrusted servers.
type ToolAnnotations struct {
	// If true, the tool may perform destructive updates to its environment. If
	// false, the tool performs only additive updates.
	//
	// (This property is meaningful only when `readOnlyHint == false`)
	//
	// Default: true
	DestructiveHint bool `json:"destructiveHint,omitempty"`
	// If true, calling the tool repeatedly with the same arguments will have no
	// additional effect on the its environment.
	//
	// (This property is meaningful only when `readOnlyHint == false`)
	//
	// Default: false
	IdempotentHint bool `json:"idempotentHint,omitempty"`
	// If true, this tool may interact with an "open world" of external entities. If
	// false, the tool's domain of interaction is closed. For example, the world of
	// a web search tool is open, whereas that of a memory tool is not.
	//
	// Default: true
	OpenWorldHint bool `json:"openWorldHint,omitempty"`
	// If true, the tool does not modify its environment.
	//
	// Default: false
	ReadOnlyHint bool `json:"readOnlyHint,omitempty"`
	// A human-readable title for the tool.
	Title string `json:"title,omitempty"`
}

type ToolListChangedParams struct {
	// This property is reserved by the protocol to allow clients and servers to
	// attach additional metadata to their responses.
	Meta Meta `json:"_meta,omitempty"`
}

func (x *ToolListChangedParams) GetMeta() *Meta { return &x.Meta }

// Describes the name and version of an MCP implementation.
type implementation struct {
	Name    string `json:"name"`
	Version string `json:"version"`
}

// Present if the server supports sending log messages to the client.
type loggingCapabilities struct {
}

// Present if the server offers any prompt templates.
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 {
	// Whether this server supports notifications for changes to the resource list.
	ListChanged bool `json:"listChanged,omitempty"`
	// Whether this server supports subscribing to resource updates.
	Subscribe bool `json:"subscribe,omitempty"`
}

// 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 {
	// Present if the server supports argument autocompletion suggestions.
	Completions struct {
	} `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"`
	// Present if the server offers any prompt templates.
	Prompts *promptCapabilities `json:"prompts,omitempty"`
	// Present if the server offers any resources to read.
	Resources *resourceCapabilities `json:"resources,omitempty"`
	// Present if the server offers any tools to call.
	Tools *toolCapabilities `json:"tools,omitempty"`
}

// Present if the server offers any tools to call.
type toolCapabilities struct {
	// Whether this server supports notifications for changes to the tool list.
	ListChanged bool `json:"listChanged,omitempty"`
}

const (
	methodCallTool                  = "tools/call"
	notificationCancelled           = "notifications/cancelled"
	methodComplete                  = "completion/complete"
	methodCreateMessage             = "sampling/createMessage"
	methodGetPrompt                 = "prompts/get"
	methodInitialize                = "initialize"
	notificationInitialized         = "notifications/initialized"
	methodListPrompts               = "prompts/list"
	methodListResourceTemplates     = "resources/templates/list"
	methodListResources             = "resources/list"
	methodListRoots                 = "roots/list"
	methodListTools                 = "tools/list"
	notificationLoggingMessage      = "notifications/message"
	methodPing                      = "ping"
	notificationProgress            = "notifications/progress"
	notificationPromptListChanged   = "notifications/prompts/list_changed"
	methodReadResource              = "resources/read"
	notificationResourceListChanged = "notifications/resources/list_changed"
	notificationResourceUpdated     = "notifications/resources/updated"
	notificationRootsListChanged    = "notifications/roots/list_changed"
	methodSetLevel                  = "logging/setLevel"
	methodSubscribe                 = "resources/subscribe"
	notificationToolListChanged     = "notifications/tools/list_changed"
	methodUnsubscribe               = "resources/unsubscribe"
)