Struct CallToolResult 

pub struct CallToolResult {
    pub result_type: ResultType,
    pub content: Vec<ContentBlock>,
    pub is_error: Option<bool>,
    pub structured_content: Option<Value>,
    pub meta: Option<ResultMetaObject>,
}

Result for tools/call — extends Result.

Note on structuredContent: 2026-07-28 widens this from object-only (2025-11-25) to any JSON value (unknown). The field is typed Option<Value> here — arrays, scalars, and null are now accepted.

Fields

result_type: ResultType

Discriminator per Result.resultType. Complete for normal results; clients receiving an input_required value should parse the message as InputRequiredResult instead via the CallToolResultResponse.result union.

content: Vec<ContentBlock>

Content returned by the tool.

is_error: Option<bool>

Whether the tool call resulted in an error.

structured_content: Option<Value>

Structured content (any JSON value per 2026-07-28; was object-only in 2025-11-25).

meta: Option<ResultMetaObject>

Meta information (follows MCP Result interface).

Implementations

impl CallToolResult

pub fn new(content: Vec<ContentBlock>) -> CallToolResult

pub fn success(content: Vec<ContentBlock>) -> CallToolResult

pub fn error(content: Vec<ContentBlock>) -> CallToolResult

pub fn with_error_flag(self, is_error: bool) -> CallToolResult

pub fn with_structured_content( self, structured_content: Value, ) -> CallToolResult

pub fn with_meta(self, meta: impl Into<ResultMetaObject>) -> CallToolResult

pub fn from_result<T>(result: &T) -> Result<CallToolResult, McpError>

where T: Serialize,

Create response from serializable result with optional structured content

pub fn from_result_with_structured<T>( result: &T, ) -> Result<CallToolResult, McpError>

where T: Serialize,

Create response with both text and structured content

pub fn from_result_with_schema<T>( result: &T, schema: Option<&ToolSchema>, ) -> Result<CallToolResult, McpError>

where T: Serialize,

Create response from serializable result with automatic structured content based on schema

pub fn from_result_auto<T>( result: &T, schema: Option<&ToolSchema>, ) -> Result<CallToolResult, McpError>

where T: Serialize,

Create response with automatic structured content for primitives (zero-config)

pub fn from_json_with_schema( json_result: Value, schema: Option<&ToolSchema>, ) -> CallToolResult

Create response from JSON value with automatic structured content

Trait Implementations

impl CallToolResult for CallToolResult

fn content(&self) -> &Vec<ContentBlock>

fn is_error(&self) -> Option<bool>

fn structured_content(&self) -> Option<&Value>

Structured content that matches the tool’s outputSchema.

impl Clone for CallToolResult

fn clone(&self) -> CallToolResult

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CallToolResult

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CallToolResult

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl HasData for CallToolResult

fn data(&self) -> HashMap<String, Value>

impl HasMeta for CallToolResult

fn meta(&self) -> Option<&ResultMetaObject>

impl HasResultType for CallToolResult

fn result_type(&self) -> ResultType

impl RpcResult for CallToolResult

impl Serialize for CallToolResult

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.