Struct ServerCapabilities 

pub struct ServerCapabilities {
    pub tools: Option<ToolsCapability>,
    pub resources: Option<ResourcesCapability>,
    pub prompts: Option<PromptsCapability>,
    pub logging: Option<LoggingCapability>,
    pub tasks: Option<TasksCapability>,
    pub completions: Option<CompletionsCapability>,
    pub experimental: Option<HashMap<String, Value>>,
    pub extensions: Option<HashMap<String, Value>>,
}

Features exposed by an MCP server.

An absent capability means the server does not advertise the corresponding operation. Protocol 2026-07-28 returns this from server/discover; earlier versions return it from initialize.

Fields

tools: Option<ToolsCapability>

Tool listing and invocation support.

resources: Option<ResourcesCapability>

Resource listing, reading, and optional subscription support.

prompts: Option<PromptsCapability>

Prompt listing and retrieval support.

logging: Option<LoggingCapability>

Logging capability - servers that emit log notifications declare this

tasks: Option<TasksCapability>

Legacy Tasks capability advertised by pre-final protocol versions.

completions: Option<CompletionsCapability>

Completion capability - server provides autocomplete suggestions

experimental: Option<HashMap<String, Value>>

Experimental, non-standard capabilities

extensions: Option<HashMap<String, Value>>

Declared extension support (SEP-1724/SEP-2133).

Keys MUST follow the _meta key naming rules (reverse-DNS prefix mandatory, e.g. io.modelcontextprotocol/tasks) per the final 2026-07-28 schema.

Trait Implementations

impl Clone for ServerCapabilities

fn clone(&self) -> ServerCapabilities

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ServerCapabilities

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for ServerCapabilities

fn default() -> ServerCapabilities

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ServerCapabilities

fn deserialize<__D>( __deserializer: __D, ) -> Result<ServerCapabilities, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ServerCapabilities

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.