Enum Part 

#[non_exhaustive]
pub enum Part {
    Text {
        content: String,
        metadata: Option<Value>,
        mediaType: Option<String>,
        filename: Option<String>,
    },
    Raw {
        bytes: String,
        mediaType: String,
        metadata: Option<Value>,
        filename: Option<String>,
    },
    Url {
        url: String,
        mediaType: Option<String>,
        metadata: Option<Value>,
        filename: Option<String>,
    },
    Data {
        data: Value,
        metadata: Option<Value>,
        mediaType: Option<String>,
        filename: Option<String>,
    },
    Unknown,
}

One element of a multi-part payload — A2A spec §6.2.

Tagged enum on "type". Optional metadata, filename, and mediaType are present on every variant per the spec.

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.

Text

UTF-8 text part.

Fields

content: String

The text body.

metadata: Option<Value>

Free-form metadata attached to the part.

mediaType: Option<String>

IANA media type hint (rarely used for text).

filename: Option<String>

Suggested filename when extracting the part.

Raw

Inline binary blob, base64-encoded.

Fields

bytes: String

Base64-encoded bytes.

mediaType: String

IANA media type of the bytes.

metadata: Option<Value>

Free-form metadata.

filename: Option<String>

Suggested filename.

Url

External resource reference.

Fields

url: String

URL to fetch.

mediaType: Option<String>

IANA media type hint.

metadata: Option<Value>

Free-form metadata.

filename: Option<String>

Suggested filename.

Data

Arbitrary structured JSON.

Fields

data: Value

The JSON value.

metadata: Option<Value>

Free-form metadata.

mediaType: Option<String>

IANA media type hint (rarely used).

filename: Option<String>

Suggested filename.

Unknown

An unrecognized part type from a newer peer. Deserialization maps any unknown "type" here instead of failing, preserving forward-compat.

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: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Part

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

where __S: Serializer,

Serialize this value into the given Serde serializer.