Enum McpMethod 

pub enum McpMethod {
    Initialize,
    Ping,
    ToolsList,
    ToolsCall,
    ResourcesList,
    ResourcesRead,
    ResourceTemplatesList,
    PromptsList,
    PromptsGet,
    SetLogLevel,
    Complete,
    InitializedNotification,
    CancelledNotification,
    ProgressNotification,
    LoggingMessageNotification,
    RootsListChangedNotification,
    SamplingCreateMessage,
    ElicitationCreate,
    RootsList,
}

Every method MCP defines, as of 2026-07-28.

One variant per method, so an unknown name cannot be confused with a known one at the type level: lookup returning None is the only way to reach -32601.

Variants

Initialize

initialize.

Ping

ping.

ToolsList

tools/list.

ToolsCall

tools/call.

ResourcesList

resources/list.

ResourcesRead

resources/read.

ResourceTemplatesList

resources/templates/list.

PromptsList

prompts/list.

PromptsGet

prompts/get.

SetLogLevel

logging/setLevel.

Complete

completion/complete.

InitializedNotification

notifications/initialized.

CancelledNotification

notifications/cancelled.

ProgressNotification

notifications/progress.

LoggingMessageNotification

notifications/message.

RootsListChangedNotification

notifications/roots/list_changed.

SamplingCreateMessage

sampling/createMessage.

ElicitationCreate

elicitation/create.

RootsList

roots/list.

Implementations

impl McpMethod

pub const ALL: [Self; 19]

Every method, in the order the specification introduces them.

Exists so a test can assert the direction a per-name test cannot: that every variant is reachable from a name, not merely that every name has a variant. A method added to the enum and forgotten in lookup is otherwise a -32601 waiting to happen.

pub const fn as_str(self) -> &'static str

The wire name of this method.

pub fn is_request(self) -> bool

Whether a request naming this method is something a server answers.

Only informational. A server still has to consult the session’s FeatureProfile before answering, because a method can exist in the schema and be unavailable in a given session — roots/list after roots is deprecated, or sampling/createMessage from a client that never advertised sampling. This answers the narrower question of whether the name is a request name at all, which is what the router needs to pick between its two params decoders.

Trait Implementations

impl Clone for McpMethod

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for McpMethod

impl Debug for McpMethod

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

Formats the value using the given formatter.

impl Eq for McpMethod

impl Hash for McpMethod

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for McpMethod

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for McpMethod