Struct McpContent 

pub struct McpContent {
    pub kind: &'static str,
    pub text: String,
    pub mime_type: Option<String>,
    pub uri: Option<String>,
}

Content returned by tool and resource handlers.

Create with McpContent::text (plain text or JSON strings), McpContent::json (marks MIME type as application/json), McpContent::image (base64-encoded binary image data), or McpContent::embedded (a resource embedded inline in a tool response).

Fields

kind: &'static str

"text", "image", or "resource".

text: String

The content string — text for "text", base64 data for "image", or the embedded resource’s text for "resource".

mime_type: Option<String>

Optional MIME type override (default "text/plain" for "text"; required in practice for "image"/"resource", set by their constructors).

uri: Option<String>

The resource URI — only set (and only serialized) for "resource".

Implementations

impl McpContent

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

Plain-text content.

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

JSON content — sets mimeType to application/json.

pub fn image(data: impl Into<String>, mime_type: impl Into<String>) -> Self

Image content (screenshot, chart, generated art) — data is base64-encoded binary and mime_type is e.g. "image/png".

pub fn embedded( uri: impl Into<String>, text: impl Into<String>, mime_type: impl Into<String>, ) -> Self

A resource embedded inline in a tool response, as opposed to one a client fetches separately via resources/read.

Trait Implementations

impl Clone for McpContent

fn clone(&self) -> McpContent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for McpContent

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

Formats the value using the given formatter.