优化上下文事件更新的处理逻辑

src-tauri/src/parsers/claude.rs

@@ -58,6 +58,19 @@ fn is_meta_message(value: &serde_json::Value) -> bool {
         .unwrap_or(false)
 }
 
+/// Check if an assistant message is a synthetic placeholder (e.g. generated by
+/// Claude Code for local commands like `/context` or `/model`).
+/// These carry `model: "<synthetic>"` and all-zero usage, so they should be
+/// excluded from conversation turns and stats.
+fn is_synthetic_assistant(value: &serde_json::Value) -> bool {
+    value
+        .get("message")
+        .and_then(|m| m.get("model"))
+        .and_then(|m| m.as_str())
+        .map(|s| s == "<synthetic>")
+        .unwrap_or(false)
+}
+
 fn parse_model_capacity_suffix(model: &str) -> Option<u64> {
     let captures = model_capacity_suffix_regex().captures(model.trim())?;
     let value = captures.get(1)?.as_str().parse::<f64>().ok()?;
@@ -236,6 +249,11 @@ impl ClaudeParser {
             }
 
             if msg_type == "user" || msg_type == "assistant" {
+                // Skip synthetic assistant placeholders for local commands
+                if msg_type == "assistant" && is_synthetic_assistant(&value) {
+                    continue;
+                }
+
                 message_count += 1;
 
                 // Extract model from assistant messages
@@ -449,6 +467,10 @@ impl ClaudeParser {
             }
 
             match msg_type {
+                "assistant" if is_synthetic_assistant(&value) => {
+                    // Skip synthetic assistant placeholders for local commands
+                    continue;
+                }
                 "user" => {
                     let content = extract_user_content(&value);
 
@@ -1036,6 +1058,103 @@ mod tests {
         assert_eq!(resolved, PathBuf::from("/Users/default/.claude"));
     }
 
+    #[test]
+    fn synthetic_assistant_excluded_from_detail() {
+        let path = std::env::temp_dir().join(format!(
+            "codeg-claude-synthetic-{}.jsonl",
+            uuid::Uuid::new_v4()
+        ));
+        let mut file = fs::File::create(&path).expect("create temp jsonl");
+        // Normal user message
+        writeln!(
+            file,
+            "{}",
+            json!({
+                "type": "user",
+                "sessionId": "synth-test",
+                "timestamp": "2026-03-01T10:00:00Z",
+                "uuid": "u1",
+                "cwd": "/tmp/demo",
+                "message": {
+                    "content": [{"type": "text", "text": "hello"}]
+                }
+            })
+        )
+        .unwrap();
+        // Normal assistant message with real usage
+        writeln!(
+            file,
+            "{}",
+            json!({
+                "type": "assistant",
+                "sessionId": "synth-test",
+                "timestamp": "2026-03-01T10:00:02Z",
+                "uuid": "a1",
+                "message": {
+                    "model": "claude-sonnet-4-6",
+                    "content": [{"type": "text", "text": "world"}],
+                    "usage": {
+                        "input_tokens": 1000,
+                        "output_tokens": 200,
+                        "cache_creation_input_tokens": 300,
+                        "cache_read_input_tokens": 400
+                    }
+                }
+            })
+        )
+        .unwrap();
+        // Synthetic assistant from a local command like /context
+        writeln!(
+            file,
+            "{}",
+            json!({
+                "type": "assistant",
+                "sessionId": "synth-test",
+                "timestamp": "2026-03-01T10:01:00Z",
+                "uuid": "a2",
+                "message": {
+                    "model": "<synthetic>",
+                    "content": [{"type": "text", "text": "No response requested."}],
+                    "usage": {
+                        "input_tokens": 0,
+                        "output_tokens": 0,
+                        "cache_creation_input_tokens": 0,
+                        "cache_read_input_tokens": 0
+                    }
+                }
+            })
+        )
+        .unwrap();
+
+        let parser = ClaudeParser {
+            base_dir: PathBuf::new(),
+        };
+        let detail = parser
+            .parse_conversation_detail(&path, "synth-test")
+            .expect("parse detail");
+        fs::remove_file(&path).unwrap();
+
+        // Should have 2 turns (user + real assistant), synthetic is excluded
+        assert_eq!(detail.turns.len(), 2);
+        assert!(
+            !detail
+                .turns
+                .iter()
+                .any(|t| t.blocks.iter().any(|b| matches!(
+                    b,
+                    ContentBlock::Text { text } if text == "No response requested."
+                ))),
+            "synthetic assistant content should not appear in turns"
+        );
+
+        // Stats should reflect only the real assistant usage
+        let stats = detail.session_stats.expect("session stats");
+        assert_eq!(stats.context_window_used_tokens, Some(1700));
+        assert_eq!(stats.context_window_max_tokens, Some(200_000));
+        let total = stats.total_tokens.expect("total tokens");
+        assert_eq!(total, 1900); // 1000 + 200 + 300 + 400
+    }
+
     #[test]
     fn extract_user_content_parses_claude_base64_image_block() {
         let value = json!({

src/components/layout/status-bar-tokens.tsx

@@ -65,8 +65,12 @@ export function StatusBarTokens() {
     getConnSnapshot
   )
 
-  const liveContextUsed = activeConn?.usage?.used ?? null
+  const rawLiveUsed = activeConn?.usage?.used ?? null
-  const liveContextMax = activeConn?.usage?.size ?? null
+  const rawLiveSize = activeConn?.usage?.size ?? null
+  // Treat live used=0 as "no data" so we fall back to sessionStats —
+  // Claude Code sends used=0 for synthetic local commands (/context etc.)
+  const liveContextUsed = rawLiveUsed != null && rawLiveUsed > 0 ? rawLiveUsed : null
+  const liveContextMax = rawLiveSize != null && rawLiveSize > 0 ? rawLiveSize : null
 
   const contextUsed =
     liveContextUsed ?? sessionStats?.context_window_used_tokens ?? null

src/contexts/acp-connections-context.tsx

@@ -975,6 +975,12 @@ function connectionsReducer(
     case "USAGE_UPDATE": {
       const conn = state.get(action.contextKey)
       if (!conn) return state
+      // Ignore usage updates that reset used to 0 when we already have
+      // valid data — these come from synthetic responses for local commands
+      // like /context and would overwrite the real context window usage.
+      if (action.usage.used === 0 && conn.usage && conn.usage.used > 0) {
+        return state
+      }
       if (
         conn.usage?.used === action.usage.used &&
         conn.usage?.size === action.usage.size