Enum MessageMcpResponse 

#[non_exhaustive]
pub enum MessageMcpResponse {
    Result {
        result: Value,
        meta: Option<Map<String, Value>>,
    },
    Error {
        error: McpError,
        meta: Option<Map<String, Value>>,
    },
}

Available on crate feature unstable_mcp_over_acp only.

UNSTABLE

The successful outer ACP mcp/message response carries exactly one inner MCP outcome: an opaque result (including JSON null), or an MCP error. Outer ACP errors are reserved for binding and runtime failures.

Both branches require their carrier key. An error must be a non-null object. Unknown outer fields are ignored; inner result and error fields are preserved. Carrier _meta is optional; null or invalid values are treated as absent. Senders must include exactly one outcome; receivers prefer result if both are present.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Result

An opaque inner MCP result.

Fields

result: Value

Required, even if JSON null.

meta: Option<Map<String, Value>>

Optional ACP carrier metadata.

Error

A structured inner MCP error.

Fields

error: McpError

Required, non-null MCP error object.

meta: Option<Map<String, Value>>

Optional ACP carrier metadata.

Implementations

impl MessageMcpResponse

pub fn success(result: Value) -> Self

Wrap any JSON result without interpreting its MCP result type.

pub fn error(error: McpError) -> Self

Wrap an inner MCP error in a successful outer ACP response.

pub fn meta(self, meta: impl IntoOption<Map<String, Value>>) -> Self

Attach optional carrier-level ACP metadata.

Trait Implementations

impl Clone for MessageMcpResponse

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageMcpResponse

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MessageMcpResponse

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for MessageMcpResponse

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 MessageMcpResponse

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for MessageMcpResponse

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for MessageMcpResponse