Struct ToolCall 

pub struct ToolCall {
    pub id: String,
    pub name: String,
    pub arguments: Value,
}

A tool call generated by the LLM.

When the LLM decides to use a tool, it generates a ToolCall with:

• A unique ID to match with the response
• The tool name to invoke
• Arguments parsed from the conversation

Your application should:

1. Execute the tool with the provided arguments
2. Return a ToolResult with the matching tool_call_id
3. Continue the conversation so the LLM can use the result

Example

use multi_llm::ToolCall;

// Received from LLM response
let call = ToolCall {
    id: "call_abc123".to_string(),
    name: "get_weather".to_string(),
    arguments: serde_json::json!({"city": "Paris", "units": "celsius"}),
};

// Parse and execute
let city = call.arguments["city"].as_str().unwrap();
// ... execute weather lookup ...

Fields

id: String

Unique identifier for this tool call (generated by the LLM).

Use this ID when returning the ToolResult to match the response with the original call.

name: String

Name of the tool to call.

Must match a Tool::name from the request’s tool list.

arguments: Value

Arguments to pass to the tool as JSON.

Structure matches the parameters schema defined in the Tool. May be an empty object {} if the tool has no required parameters.

Trait Implementations

impl Clone for ToolCall

fn clone(&self) -> ToolCall

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ToolCall

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ToolCall

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ToolCall

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

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 ToolCall