Enum Part 

pub enum Part {
    Text {
        text: String,
        thought: Option<bool>,
        thought_signature: Option<String>,
    },
    InlineData {
        inline_data: Blob,
    },
    FileData {
        file_data: FileDataRef,
    },
    FunctionCall {
        function_call: FunctionCall,
        thought_signature: Option<String>,
    },
    FunctionResponse {
        function_response: FunctionResponse,
        thought_signature: Option<String>,
    },
    ToolCall {
        tool_call: Value,
        thought_signature: Option<String>,
    },
    ToolResponse {
        tool_response: Value,
        thought_signature: Option<String>,
    },
    ExecutableCode {
        executable_code: Value,
        thought_signature: Option<String>,
    },
    CodeExecutionResult {
        code_execution_result: Value,
        thought_signature: Option<String>,
    },
}

Core primitive types for building requests and parsing responses Content part that can be included in a message

Variants

Text

Text content

Fields

text: String

The text content

thought: Option<bool>

Whether this is a thought summary (Gemini 2.5 series only)

thought_signature: Option<String>

The thought signature (Gemini 2.5+ thinking models only). Preserved from responses and echoed back in conversation history for Gemini 3.x thought signature support.

InlineData

Fields

inline_data: Blob

The blob data

FileData

File data referenced by URI

Fields

file_data: FileDataRef

FunctionCall

Function call from the model

Fields

function_call: FunctionCall

The function call details

thought_signature: Option<String>

The thought signature (Gemini 2.5+ thinking models only). Preserved from responses and echoed back in conversation history for Gemini 3.x thought signature support.

FunctionResponse

Function response (results from executing a function call)

Fields

function_response: FunctionResponse

The function response details

thought_signature: Option<String>

The thought signature (Gemini 3.x thinking models). Must be echoed back on function response parts when thinking is active.

ToolCall

Server-side tool call from Gemini 3 (built-in tool invocation)

Fields

tool_call: Value

thought_signature: Option<String>

The thought signature (Gemini 3.x thinking models). Must be preserved and echoed back in conversation history.

ToolResponse

Server-side tool response from Gemini 3 (built-in tool result)

Fields

tool_response: Value

thought_signature: Option<String>

The thought signature (Gemini 3.x thinking models). Must be preserved and echoed back in conversation history.

ExecutableCode

Generated code emitted by Gemini code execution.

Fields

executable_code: Value

thought_signature: Option<String>

The thought signature (Gemini 3.x thinking models). Must be preserved and echoed back in conversation history.

CodeExecutionResult

Result emitted by Gemini code execution.

Fields

code_execution_result: Value

thought_signature: Option<String>

The thought signature (Gemini 3.x thinking models). Must be preserved and echoed back in conversation history.

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Part