Enum SamplingContentBlock 

pub enum SamplingContentBlock {
    Single(SamplingContent),
    Multiple(Vec<SamplingContent>),
}

Wrapper that deserializes as either a single content block or an array.

Per MCP 2025-11-25, SamplingMessage.content is SamplingMessageContentBlock | SamplingMessageContentBlock[].

Serialize and Deserialize are implemented manually below to handle the single-vs-array polymorphism (single serializes as object, array as array).

Variants

Single(SamplingContent)

A single content block.

Multiple(Vec<SamplingContent>)

Multiple content blocks.

Implementations

impl SamplingContentBlock

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

Get the text of the first text content block, if any.

pub fn to_vec(&self) -> Vec<&SamplingContent>

Collect all content blocks into a Vec of references.

Note: this allocates. For iteration, use iter() instead.

Trait Implementations

impl Clone for SamplingContentBlock

fn clone(&self) -> SamplingContentBlock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SamplingContentBlock

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

Formats the value using the given formatter.

impl Default for SamplingContentBlock

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SamplingContentBlock

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl From<SamplingContent> for SamplingContentBlock

fn from(c: SamplingContent) -> Self

Converts to this type from the input type.

impl From<Vec<SamplingContent>> for SamplingContentBlock

fn from(v: Vec<SamplingContent>) -> Self

Converts to this type from the input type.

impl PartialEq for SamplingContentBlock

fn eq(&self, other: &SamplingContentBlock) -> 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 Serialize for SamplingContentBlock

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SamplingContentBlock