Fix for tool use

crates/g3-providers/src/lib.rs

@@ -29,6 +29,7 @@ pub struct CompletionRequest {
     pub max_tokens: Option<u32>,
     pub temperature: Option<f32>,
     pub stream: bool,
+    pub tools: Option<Vec<Tool>>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -75,6 +76,13 @@ pub struct ToolCall {
     pub args: serde_json::Value,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Tool {
+    pub name: String,
+    pub description: String,
+    pub input_schema: serde_json::Value,
+}
+
 pub mod anthropic;
 
 pub use anthropic::AnthropicProvider;