Enum EnumSchema 

pub enum EnumSchema {
    Single(SingleSelectEnumSchema),
    Multi(MultiSelectEnumSchema),
    Legacy(LegacyEnumSchema),
}

Compliant with MCP 2025-06-18 specification for elicitation schemas. Enums must have string type for values and can optionally include human-readable names.

Example

use rmcp::model::*;

let enum_schema = EnumSchema::builder(vec!["US".to_string(), "UK".to_string()])
   .multiselect()
   .min_items(1u64).expect("Min items should be correct value")
   .max_items(4u64).expect("Max items should be correct value")
   .description("Country code")
   .build();

Variants

Single(SingleSelectEnumSchema)

Multi(MultiSelectEnumSchema)

Legacy(LegacyEnumSchema)

Implementations

impl EnumSchema

pub fn builder(values: Vec<String>) -> EnumSchemaBuilder<SingleSelect>

Creates a new EnumSchemaBuilder with the given enum values.

This convenience method allows you to construct an enum schema by specifying the possible string values for the enum. Use the returned builder to further configure the schema before building it.

Arguments

• values - A vector of strings representing the allowed enum values.

Example

use rmcp::model::*;

let enum_schema = EnumSchema::builder(vec!["A".to_string(), "B".to_string()]).
    with_default("A").
    expect("Default value should be valid").
    enum_titles(vec!["Option A".to_string(), "Option B".to_string()]).
    expect("Number of titles should match number of values").
    build();

Trait Implementations

impl Clone for EnumSchema

fn clone(&self) -> EnumSchema

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EnumSchema

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for EnumSchema

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for EnumSchema

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for EnumSchema

fn eq(&self, other: &EnumSchema) -> 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 EnumSchema

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 EnumSchema