Enum Part 

pub enum Part {
    Text {
        text: String,
        metadata: Option<Value>,
    },
    File {
        file: FileContent,
        metadata: Option<Value>,
    },
    Data {
        data: Value,
        metadata: Option<Value>,
    },
}

Part content — flat proto-JSON format per A2A v1.0 spec.

Uses custom serialization to produce flat JSON without a kind discriminator:

• Part::Text → {"text": "..."}
• Part::File → {"file": {"uri": "...", "mimeType": "..."}}
• Part::Data → {"data": {...}}

Deserialization detects the variant by which field is present.

Variants

Text

Text content part

Fields

text: String

The text content

metadata: Option<Value>

Part-level metadata

File

File content part (inline bytes or URI reference)

Fields

file: FileContent

File content

metadata: Option<Value>

Part-level metadata

Data

Structured data part

Fields

data: Value

Structured JSON data

metadata: Option<Value>

Part-level metadata

Implementations

impl Part

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

Create a text part

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

Create a file part with a URI reference

pub fn file_bytes( bytes: impl Into<String>, mime_type: impl Into<String>, ) -> Self

Create a file part with inline bytes (base64-encoded)

pub fn data(data: Value) -> Self

Create a structured data part

pub fn as_text(&self) -> Option<&str>

Get the text content, if this is a text part

Trait Implementations

impl Clone for Part

fn clone(&self) -> Part

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Part

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Part

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl PartialEq for Part

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

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Part