TUIに向けたprotocolの詳細調整

crates/llm-worker/src/worker.rs

@@ -162,6 +162,11 @@ pub struct Worker<C: LlmClient, S: WorkerState = Mutable> {
     /// can be forwarded to the user — distinct from `tracing::warn!`,
     /// which is for developer-facing logs.
     warning_cbs: Vec<Box<dyn Fn(&str) + Send + Sync>>,
+    /// Tool-result callbacks. Invoked once per completed tool call
+    /// after post-execution interceptors and the output byte-cap
+    /// truncation have been applied — i.e. on the same data that
+    /// enters history.
+    tool_result_cbs: Vec<Box<dyn Fn(&ToolResult) + Send + Sync>>,
     /// Request configuration (max_tokens, temperature, etc.)
     request_config: RequestConfig,
     /// Whether the previous run was interrupted
@@ -302,6 +307,22 @@ impl<C: LlmClient, S: WorkerState> Worker<C, S> {
         }
     }
 
+    /// Register a callback invoked once per completed tool execution.
+    ///
+    /// Fired after `post_tool_call` interceptors and any `content`
+    /// truncation from `tool_output_limits`, so the callback observes
+    /// exactly what is persisted to history. Intended for upper layers
+    /// (e.g. Pod) to forward tool results to clients.
+    pub fn on_tool_result(&mut self, callback: impl Fn(&ToolResult) + Send + Sync + 'static) {
+        self.tool_result_cbs.push(Box::new(callback));
+    }
+
+    fn emit_tool_result(&self, result: &ToolResult) {
+        for cb in &self.tool_result_cbs {
+            cb(result);
+        }
+    }
+
     /// Register a turn-end callback (receives 0-based turn number).
     pub fn on_turn_end(&mut self, callback: impl Fn(usize) + Send + Sync + 'static) {
         self.turn_end_cbs.push(Box::new(callback));
@@ -753,6 +774,11 @@ impl<C: LlmClient, S: WorkerState> Worker<C, S> {
             }
         }
 
+        // Emit per-result callbacks on the post-truncation payload.
+        for tool_result in &results {
+            self.emit_tool_result(tool_result);
+        }
+
         Ok(ToolExecutionResult::Completed(results))
     }
 
@@ -1016,6 +1042,7 @@ impl<C: LlmClient> Worker<C, Mutable> {
             turn_start_cbs: Vec::new(),
             turn_end_cbs: Vec::new(),
             warning_cbs: Vec::new(),
+            tool_result_cbs: Vec::new(),
             request_config: RequestConfig::default(),
             last_run_interrupted: false,
             cancel_tx,
@@ -1270,6 +1297,7 @@ impl<C: LlmClient> Worker<C, Mutable> {
             turn_start_cbs: self.turn_start_cbs,
             turn_end_cbs: self.turn_end_cbs,
             warning_cbs: self.warning_cbs,
+            tool_result_cbs: self.tool_result_cbs,
             request_config: self.request_config,
             last_run_interrupted: self.last_run_interrupted,
 
@@ -1344,6 +1372,7 @@ impl<C: LlmClient> Worker<C, Locked> {
             turn_start_cbs: self.turn_start_cbs,
             turn_end_cbs: self.turn_end_cbs,
             warning_cbs: self.warning_cbs,
+            tool_result_cbs: self.tool_result_cbs,
             request_config: self.request_config,
             last_run_interrupted: self.last_run_interrupted,
 

crates/llm-worker/tests/callback_test.rs

@@ -6,9 +6,11 @@ mod common;
 
 use std::sync::{Arc, Mutex};
 
+use async_trait::async_trait;
 use common::MockLlmClient;
 use llm_worker::Worker;
 use llm_worker::llm_client::event::{Event, ResponseStatus, StatusEvent as ClientStatusEvent};
+use llm_worker::tool::{Tool, ToolDefinition, ToolError, ToolMeta, ToolOutput};
 
 // =============================================================================
 // Tests
@@ -149,6 +151,145 @@ async fn test_callback_turn_events() {
     assert_eq!(ends[0], 0);
 }
 
+/// Stub tool returning a fixed [`ToolOutput`] for result-callback tests.
+struct FixedOutputTool {
+    output: ToolOutput,
+}
+
+#[async_trait]
+impl Tool for FixedOutputTool {
+    async fn execute(&self, _input_json: &str) -> Result<ToolOutput, ToolError> {
+        Ok(self.output.clone())
+    }
+}
+
+fn fixed_tool(name: &'static str, output: ToolOutput) -> ToolDefinition {
+    Arc::new(move || {
+        let meta = ToolMeta::new(name).input_schema(serde_json::json!({"type":"object"}));
+        (
+            meta,
+            Arc::new(FixedOutputTool {
+                output: output.clone(),
+            }) as Arc<dyn Tool>,
+        )
+    })
+}
+
+/// Verify that on_tool_result fires once per executed tool with
+/// summary/content/is_error matching what the tool returned.
+#[tokio::test]
+async fn test_callback_tool_result_events() {
+    let events = vec![
+        Event::tool_use_start(0, "call_1", "fixed"),
+        Event::tool_input_delta(0, "{}"),
+        Event::tool_use_stop(0),
+        Event::Status(ClientStatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ];
+
+    let client = MockLlmClient::new(events);
+    let mut worker = Worker::new(client);
+
+    worker.register_tool(fixed_tool(
+        "fixed",
+        ToolOutput {
+            summary: "did the thing".into(),
+            content: Some("full detail body".into()),
+        },
+    ));
+
+    let captured: Arc<Mutex<Vec<(String, String, Option<String>, bool)>>> =
+        Arc::new(Mutex::new(Vec::new()));
+    let sink = captured.clone();
+    worker.on_tool_result(move |result| {
+        sink.lock().unwrap().push((
+            result.tool_use_id.clone(),
+            result.summary.clone(),
+            result.content.clone(),
+            result.is_error,
+        ));
+    });
+
+    let _ = worker.run("call it").await;
+
+    let observed = captured.lock().unwrap();
+    assert_eq!(observed.len(), 1);
+    assert_eq!(observed[0].0, "call_1");
+    assert_eq!(observed[0].1, "did the thing");
+    assert_eq!(observed[0].2.as_deref(), Some("full detail body"));
+    assert!(!observed[0].3);
+}
+
+/// Stub tool that always fails, for exercising the error path through
+/// `on_tool_result`.
+struct ErroringTool {
+    message: String,
+}
+
+#[async_trait]
+impl Tool for ErroringTool {
+    async fn execute(&self, _input_json: &str) -> Result<ToolOutput, ToolError> {
+        Err(ToolError::ExecutionFailed(self.message.clone()))
+    }
+}
+
+fn erroring_tool(name: &'static str, message: &'static str) -> ToolDefinition {
+    Arc::new(move || {
+        let meta = ToolMeta::new(name).input_schema(serde_json::json!({"type":"object"}));
+        (
+            meta,
+            Arc::new(ErroringTool {
+                message: message.to_string(),
+            }) as Arc<dyn Tool>,
+        )
+    })
+}
+
+/// Verify on_tool_result also fires for failed executions with
+/// is_error=true, and that the ToolOutput content channel stays empty.
+#[tokio::test]
+async fn test_callback_tool_result_error_path() {
+    let events = vec![
+        Event::tool_use_start(0, "call_err", "erroring"),
+        Event::tool_input_delta(0, "{}"),
+        Event::tool_use_stop(0),
+        Event::Status(ClientStatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ];
+
+    let client = MockLlmClient::new(events);
+    let mut worker = Worker::new(client);
+
+    worker.register_tool(erroring_tool("erroring", "boom"));
+
+    let captured: Arc<Mutex<Vec<(String, String, Option<String>, bool)>>> =
+        Arc::new(Mutex::new(Vec::new()));
+    let sink = captured.clone();
+    worker.on_tool_result(move |result| {
+        sink.lock().unwrap().push((
+            result.tool_use_id.clone(),
+            result.summary.clone(),
+            result.content.clone(),
+            result.is_error,
+        ));
+    });
+
+    let _ = worker.run("fail it").await;
+
+    let observed = captured.lock().unwrap();
+    assert_eq!(observed.len(), 1);
+    assert_eq!(observed[0].0, "call_err");
+    assert!(
+        observed[0].1.contains("boom"),
+        "summary should carry the error message: {}",
+        observed[0].1
+    );
+    assert!(observed[0].2.is_none());
+    assert!(observed[0].3);
+}
+
 /// Verify that on_usage callback receives usage events
 #[tokio::test]
 async fn test_callback_usage_events() {