Enum ProgressToken 

pub enum ProgressToken {
    String(String),
    Number(Number),
}

Core MCP protocol types and error handling Progress token for tracking long-running operations.

Schema: export type ProgressToken = string | number; — used in both RequestMetaObject.progressToken? and ProgressNotificationParams.progressToken. JSON number is any IEEE-754 double, so the numeric variant is modeled as serde_json::Number to losslessly preserve the wire representation (integer vs. float, large integers beyond i64::MAX, etc.). An i64 variant would reject spec-valid tokens like 1.5.

Variants

String(String)

Number(Number)

Implementations

impl ProgressToken

pub fn new(token: impl Into<String>) -> ProgressToken

Construct a string-form token. For numeric tokens use the From<i64> / From<u64> / From<f64> impls, or ProgressToken::Number(num) directly.

pub fn as_str(&self) -> Option<&str>

Return the string body if this is a string-form token; None for numeric.

pub fn as_i64(&self) -> Option<i64>

Return the numeric body if this is an integer-form token; None for string or for a JSON float that has no exact i64 representation.

pub fn as_f64(&self) -> Option<f64>

Return the numeric body as f64 if this is a number-form token. Lossy for integers beyond 2^53; None for string-form tokens.

pub fn as_number(&self) -> Option<&Number>

Return the raw serde_json::Number for a number-form token. Use this when you need to preserve the exact wire representation (int vs float) without lossy conversion.

Trait Implementations

impl Clone for ProgressToken

fn clone(&self) -> ProgressToken

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProgressToken

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ProgressToken

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ProgressToken

impl From<&str> for ProgressToken

fn from(s: &str) -> ProgressToken

Converts to this type from the input type.

impl From<String> for ProgressToken

fn from(s: String) -> ProgressToken

Converts to this type from the input type.

impl From<f64> for ProgressToken

Construct from an f64. Panics if the value is NaN or ±infinity — JSON has no representation for those. Use serde_json::Number::from_f64 directly + ProgressToken::Number(...) if you need explicit error handling.

fn from(n: f64) -> ProgressToken

Converts to this type from the input type.

impl From<i32> for ProgressToken

fn from(n: i32) -> ProgressToken

Converts to this type from the input type.

impl From<i64> for ProgressToken

fn from(n: i64) -> ProgressToken

Converts to this type from the input type.

impl From<u64> for ProgressToken

fn from(n: u64) -> ProgressToken

Converts to this type from the input type.

impl PartialEq for ProgressToken

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ProgressToken

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 ProgressToken