drop nameless assistant tool history entries

internal/adapter/openai/message_normalize.go

@@ -78,7 +78,7 @@ func formatAssistantToolCallsForPrompt(msg map[string]any, traceID string) strin
 				args = normalizeOpenAIArgumentsForPrompt(fn["arguments"])
 			}
 			if name == "" {
-				name = "unknown"
+				continue
 			}
 			if args == "" {
 				args = normalizeOpenAIArgumentsForPrompt(call["arguments"])

internal/adapter/openai/message_normalize_test.go

@@ -194,6 +194,29 @@ func TestNormalizeOpenAIMessagesForPrompt_PreservesConcatenatedToolArguments(t *
 	}
 }
 
+
+func TestNormalizeOpenAIMessagesForPrompt_AssistantToolCallsMissingNameAreDropped(t *testing.T) {
+	raw := []any{
+		map[string]any{
+			"role": "assistant",
+			"tool_calls": []any{
+				map[string]any{
+					"id":   "call_missing_name",
+					"type": "function",
+					"function": map[string]any{
+						"arguments": `{"path":"README.MD"}`,
+					},
+				},
+			},
+		},
+	}
+
+	normalized := normalizeOpenAIMessagesForPrompt(raw, "")
+	if len(normalized) != 0 {
+		t.Fatalf("expected nameless assistant tool_calls to be dropped, got %#v", normalized)
+	}
+}
+
 func TestNormalizeOpenAIMessagesForPrompt_AssistantNilContentDoesNotInjectNullLiteral(t *testing.T) {
 	raw := []any{
 		map[string]any{

internal/js/helpers/stream-tool-sieve/sieve.js

@@ -21,22 +21,14 @@ function processToolSieveChunk(state, chunk, toolNames) {
   }
   const events = [];
 
-  if (Array.isArray(state.pendingToolCalls) && state.pendingToolCalls.length > 0) {
-    const pending = state.pending || '';
-    if (pending.trim() !== '') {
-      const content = (state.pendingToolRaw || '') + pending;
-      state.pending = '';
-      state.pendingToolRaw = '';
-      state.pendingToolCalls = [];
-      noteText(state, content);
-      events.push({ type: 'text', text: content });
-    } else {
-      return events;
-    }
-  }
-
   // eslint-disable-next-line no-constant-condition
   while (true) {
+    if (Array.isArray(state.pendingToolCalls) && state.pendingToolCalls.length > 0) {
+      events.push({ type: 'tool_calls', calls: state.pendingToolCalls });
+      state.pendingToolRaw = '';
+      state.pendingToolCalls = [];
+      continue;
+    }
     if (state.capturing) {
       if (state.pending) {
         state.capture += state.pending;