Struct FunctionDeclaration 

pub struct FunctionDeclaration {
    pub name: String,
    pub description: String,
    pub parameters: Value,
    pub scheduling: Option<FunctionScheduling>,
    pub behavior: Option<FunctionBehavior>,
}

A custom function the model may call during the session.

Keep this aligned with the official Live API tool docs. Gemini 3.1 and 2.5 differ in important ways, especially around asynchronous tool execution.

Fields

name: String

description: String

parameters: Value

JSON Schema object describing the function’s parameters.

scheduling: Option<FunctionScheduling>

Crate-level scheduling field retained for Gemini 2.5 compatibility work.

Official current Live API docs place response scheduling inside the tool-response payload, not here. Treat this field as under audit until roadmap item F-9 is completed.

behavior: Option<FunctionBehavior>

Gemini 2.5: whether the function blocks model generation.

Trait Implementations

impl Clone for FunctionDeclaration

fn clone(&self) -> FunctionDeclaration

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionDeclaration

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FunctionDeclaration

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for FunctionDeclaration

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

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 FunctionDeclaration