Struct ServerCapabilities 

pub struct ServerCapabilities {
    pub completions: Option<Map<String, Value>>,
    pub experimental: Option<BTreeMap<String, Map<String, Value>>>,
    pub extensions: Option<BTreeMap<String, Map<String, Value>>>,
    pub logging: Option<Map<String, Value>>,
    pub prompts: Option<ServerCapabilitiesPrompts>,
    pub resources: Option<ServerCapabilitiesResources>,
    pub tools: Option<ServerCapabilitiesTools>,
}

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.

Fields

completions: Option<Map<String, Value>>

Present if the server supports argument autocompletion suggestions.

experimental: Option<BTreeMap<String, Map<String, Value>>>

Experimental, non-standard capabilities that the server supports.

extensions: Option<BTreeMap<String, Map<String, Value>>>

Optional MCP extensions that the server supports. Keys are extension identifiers (e.g., “io.modelcontextprotocol/tasks”), and values are per-extension settings objects. An empty object indicates support with no settings.

Keys MUST follow the MetaObject_meta``, with a mandatory prefix.

logging: Option<Map<String, Value>>

👎Deprecated:

Deprecated as of protocol version 2026-07-28 (SEP-2577). Remains in the specification for at least twelve months; see the deprecated features registry.

Present if the server supports sending log messages to the client.

prompts: Option<ServerCapabilitiesPrompts>

Present if the server offers any prompt templates.

resources: Option<ServerCapabilitiesResources>

Present if the server offers any resources to read.

tools: Option<ServerCapabilitiesTools>

Present if the server offers any tools to call.

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 PartialEq for ServerCapabilities

fn eq(&self, other: &ServerCapabilities) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

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.

impl StructuralPartialEq for ServerCapabilities