feat: support function calling (#514)

* feat: support function calling

* fix on Windows OS

* implement multi-steps function calling

* fix on Windows OS

* add error for client not support function calling

* refactor message data structure and make claude client supporting function calling

* support reuse previous call results

* improve error handling for function calling

* use prefix `may_`  as indicator for `execute` type fucntions

1 files changed, 4 insertions, 4 deletions

diff --git a/src/client/vertexai_claude.rs b/src/client/vertexai_claude.rs
index 2b5f763..2c51d59 100644
--- a/src/client/vertexai_claude.rs
+++ b/src/client/vertexai_claude.rs
@@ -2,7 +2,7 @@ use super::access_token::*;
 use super::claude::{claude_build_body, claude_send_message, claude_send_message_streaming};
 use super::vertexai::prepare_gcloud_access_token;
 use super::{
-    Client, CompletionDetails, ExtraConfig, Model, ModelConfig, PromptAction, PromptKind, SendData,
+    Client, CompletionOutput, ExtraConfig, Model, ModelData, PromptAction, PromptKind, SendData,
     SseHandler, VertexAIClaudeClient,
 };
 
@@ -18,7 +18,7 @@ pub struct VertexAIClaudeConfig {
     pub location: Option<String>,
     pub adc_file: Option<String>,
     #[serde(default)]
-    pub models: Vec<ModelConfig>,
+    pub models: Vec<ModelData>,
     pub extra: Option<ExtraConfig>,
 }
 
@@ -39,7 +39,7 @@ impl VertexAIClaudeClient {
         let base_url = format!("https://{location}-aiplatform.googleapis.com/v1/projects/{project_id}/locations/{location}/publishers");
         let url = format!(
             "{base_url}/anthropic/models/{}:streamRawPredict",
-            self.model.name
+            self.model.name()
         );
 
         let mut body = claude_build_body(data, &self.model)?;
@@ -64,7 +64,7 @@ impl Client for VertexAIClaudeClient {
         &self,
         client: &ReqwestClient,
         data: SendData,
-    ) -> Result<(String, CompletionDetails)> {
+    ) -> Result<CompletionOutput> {
         prepare_gcloud_access_token(client, self.name(), &self.config.adc_file).await?;
         let builder = self.request_builder(client, data)?;
         claude_send_message(builder).await