Struct Version 

pub struct Version {
    pub year: u16,
    pub month: u8,
    pub day: u8,
}

Semantic version representation

Fields

year: u16

Year component

month: u8

Month component

day: u8

Day component

Implementations

impl Version

pub fn new(year: u16, month: u8, day: u8) -> Result<Self, VersionError>

Create a new version

Errors

Returns VersionError::InvalidMonth if month is not in range 1-12. Returns VersionError::InvalidDay if day is invalid for the given month.

pub fn stable() -> Self

Get the stable MCP protocol version (2025-06-18)

This version is widely compatible with MCP clients including Claude Code. Use this as the default for maximum compatibility.

pub fn current() -> Self

👎Deprecated since 2.4.0: Use stable() or latest() instead

Alias for stable() for backwards compatibility

pub fn latest() -> Self

Get the latest MCP protocol version (2025-11-25)

This is the current official MCP specification version. Note: Some clients like Claude Code may not support this version yet.

pub fn draft() -> Self

👎Deprecated since 2.4.0: Use latest() instead - 2025-11-25 is now official

Alias for latest() for backwards compatibility

pub fn is_newer_than(&self, other: &Version) -> bool

Check if this version is newer than another

pub fn is_older_than(&self, other: &Version) -> bool

Check if this version is older than another

pub fn is_compatible_with(&self, other: &Version) -> bool

Check if this version is compatible with another

pub fn to_date_string(&self) -> String

Get version as a date string (YYYY-MM-DD)

pub fn from_date_string(s: &str) -> Result<Self, VersionError>

Parse version from date string

Errors

Returns VersionError if the string is not in YYYY-MM-DD format or contains invalid date components.

pub fn known_versions() -> Vec<Version>

Get all known MCP versions

Trait Implementations

impl Clone for Version

fn clone(&self) -> Version

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Version

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Version

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Version

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

Formats the value using the given formatter.

impl FromStr for Version

type Err = VersionError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Ord for Version

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Version

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Version

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Version

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Version

impl StructuralPartialEq for Version