Migrate Rig tool flow to domain runtime

crates/galaxy_agent_rig/src/openai_compatible.rs

@@ -180,12 +180,14 @@ where
                             }
                         }
                         Ok(StreamedAssistantContent::ToolCall { tool_call, .. }) => {
-                            yield Ok(AgentEvent::ToolProposed {
-                                call: ToolCall {
+                            yield Ok(AgentEvent::Tool {
+                                event: galaxy_agent_core::ToolEvent::Proposed {
+                                    call: ToolCall {
                                     id: tool_call.id,
                                     name: tool_call.function.name,
                                     arguments: tool_call.function.arguments,
                                 },
+                                },
                             });
                         }
                         Ok(StreamedAssistantContent::ToolCallDelta { .. }) => {
@@ -298,10 +300,10 @@ fn user_content(content: MessageContent) -> Result<OneOrMany<UserContent>, Agent
         MessageContent::ToolResult {
             tool_use_id,
             content,
-            ..
+            is_error,
         } => vec![UserContent::tool_result(
             tool_use_id,
-            OneOrMany::one(ToolResultContent::text(content)),
+            OneOrMany::one(ToolResultContent::text(tool_result_text(content, is_error))),
         )],
         MessageContent::MultiPart(parts) => parts
             .into_iter()
@@ -344,10 +346,10 @@ fn convert_user_part(part: ContentPart) -> Result<UserContent, AgentError> {
         ContentPart::ToolResult {
             tool_use_id,
             content,
-            ..
+            is_error,
         } => Ok(UserContent::tool_result(
             tool_use_id,
-            OneOrMany::one(ToolResultContent::text(content)),
+            OneOrMany::one(ToolResultContent::text(tool_result_text(content, is_error))),
         )),
         ContentPart::ToolUse { .. } => Err(invalid_role("tool use", "user")),
     }
@@ -371,6 +373,14 @@ fn convert_assistant_part(part: ContentPart) -> Result<AssistantContent, AgentEr
     }
 }
 
+fn tool_result_text(content: String, is_error: bool) -> String {
+    if is_error {
+        format!("[ERROR] {content}")
+    } else {
+        content
+    }
+}
+
 fn one_or_many<T: Clone>(parts: Vec<T>, role: &str) -> Result<OneOrMany<T>, AgentError> {
     OneOrMany::many(parts).map_err(|_| {
         AgentError::new(