Enum Part 

pub enum Part {
    FunctionCall {
        function_call: FunctionCall,
        thought_signature: Option<String>,
    },
    FunctionResponse {
        function_response: FunctionResponse,
        thought_signature: Option<String>,
    },
    ToolCall {
        tool_call: ServerToolCall,
        thought_signature: Option<String>,
    },
    ToolResponse {
        tool_response: ServerToolResponse,
        thought_signature: Option<String>,
    },
    ExecutableCode {
        executable_code: Value,
        thought_signature: Option<String>,
    },
    CodeExecutionResult {
        code_execution_result: Value,
        thought_signature: Option<String>,
    },
    InlineData {
        inline_data: InlineData,
    },
    Text {
        text: String,
        thought_signature: Option<String>,
    },
    CacheControl {
        ttl_seconds: Option<u64>,
    },
}

IMPORTANT: Variant ordering matters for #[serde(untagged)] deserialization. Serde tries variants in declaration order and returns the first successful match. Variants with required fields (FunctionCall, FunctionResponse, InlineData, Text) must come BEFORE CacheControl, which has only optional fields and would otherwise act as a catch-all, matching any JSON object.

Variants

FunctionCall

Fields

function_call: FunctionCall

thought_signature: Option<String>

Gemini 3 thought signature for maintaining reasoning context Required for sequential function calling, optional for parallel calls (only first has it)

FunctionResponse

Fields

function_response: FunctionResponse

thought_signature: Option<String>

Gemini 3 thought signature for maintaining reasoning context Preserved when echoing function responses back to the model

ToolCall

Fields

tool_call: ServerToolCall

thought_signature: Option<String>

ToolResponse

Fields

tool_response: ServerToolResponse

thought_signature: Option<String>

ExecutableCode

Fields

executable_code: Value

thought_signature: Option<String>

CodeExecutionResult

Fields

code_execution_result: Value

thought_signature: Option<String>

InlineData

Fields

inline_data: InlineData

Text

Fields

text: String

thought_signature: Option<String>

Gemini 3 thought signature for maintaining reasoning context Must be preserved and sent back exactly as received

CacheControl

CacheControl MUST be last: it has only optional fields and would match any JSON object

Fields

ttl_seconds: Option<u64>

Implementations

impl Part

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

Get the text content if this is a Text part

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

Trait Implementations

impl Clone for Part

fn clone(&self) -> Self

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.