Enum ToolOutput 

pub enum ToolOutput {
    Content(Vec<Box<dyn Content>>),
    Structured(Value),
}

Tool execution output - either content OR structured, never both.

MCP spec allows tools to return either:

• content: Array of content items (text, images, etc.) for display
• structuredContent: JSON object conforming to the tool’s outputSchema

This enum enforces exclusivity at the type level.

Variants

Content(Vec<Box<dyn Content>>)

Traditional content array (text, images, etc.)

Structured(Value)

Structured JSON output (must conform to outputSchema if defined)

Implementations

impl ToolOutput

pub fn text(s: impl Into<String>) -> Self

Create content output with a single text item

pub fn texts(items: &[&str]) -> Self

Create content output with multiple text items

pub fn content(items: Vec<Box<dyn Content>>) -> Self

Create content output from a vec of content items

pub fn structured<T: Serialize>(value: T) -> Result<Self, Error>

Create structured output from a serializable value

pub fn json(value: Value) -> Self

Create structured output from a raw JSON value

pub fn is_content(&self) -> bool

Check if this is content output

pub fn is_structured(&self) -> bool

Check if this is structured output

Trait Implementations

impl Debug for ToolOutput

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

Formats the value using the given formatter.