diff --git a/internal/adapter/openai/tool_history_sanitize.go b/internal/adapter/openai/tool_history_sanitize.go
index b940950..6a2e80a 100644
--- a/internal/adapter/openai/tool_history_sanitize.go
+++ b/internal/adapter/openai/tool_history_sanitize.go
@@ -2,15 +2,13 @@ package openai
 
 import (
 	"regexp"
-	"strings"
 )
 
 var leakedToolHistoryPattern = regexp.MustCompile(`(?is)\[TOOL_CALL_HISTORY\][\s\S]*?\[/TOOL_CALL_HISTORY\]|\[TOOL_RESULT_HISTORY\][\s\S]*?\[/TOOL_RESULT_HISTORY\]`)
 
 func sanitizeLeakedToolHistory(text string) string {
-	if strings.TrimSpace(text) == "" {
+	if text == "" {
 		return text
 	}
-	cleaned := leakedToolHistoryPattern.ReplaceAllString(text, "")
-	return strings.TrimSpace(cleaned)
+	return leakedToolHistoryPattern.ReplaceAllString(text, "")
 }
diff --git a/internal/adapter/openai/tool_history_sanitize_test.go b/internal/adapter/openai/tool_history_sanitize_test.go
index c0c2c77..0236b02 100644
--- a/internal/adapter/openai/tool_history_sanitize_test.go
+++ b/internal/adapter/openai/tool_history_sanitize_test.go
@@ -10,6 +10,14 @@ func TestSanitizeLeakedToolHistoryRemovesMarkerBlocks(t *testing.T) {
 	}
 }
 
+func TestSanitizeLeakedToolHistoryPreservesChunkWhitespace(t *testing.T) {
+	raw := "Hello "
+	got := sanitizeLeakedToolHistory(raw)
+	if got != "Hello " {
+		t.Fatalf("expected trailing whitespace to be preserved, got %q", got)
+	}
+}
+
 func TestFlushToolSieveDropsToolHistoryLeak(t *testing.T) {
 	var state toolStreamSieveState
 	chunk := "[TOOL_CALL_HISTORY]\nstatus: already_called\nfunction.name: exec\nfunction.arguments: {}\n[/TOOL_CALL_HISTORY]"
@@ -22,3 +30,16 @@ func TestFlushToolSieveDropsToolHistoryLeak(t *testing.T) {
 		t.Fatalf("expected history block to be swallowed, got %+v", flushed)
 	}
 }
+
+func TestFlushToolSieveDropsToolResultHistoryLeak(t *testing.T) {
+	var state toolStreamSieveState
+	chunk := "[TOOL_RESULT_HISTORY]\nstatus: already_called\nfunction.name: exec\nfunction.arguments: {}\n[/TOOL_RESULT_HISTORY]"
+	evts := processToolSieveChunk(&state, chunk, []string{"exec"})
+	if len(evts) != 0 {
+		t.Fatalf("expected no immediate output before result history block is complete, got %+v", evts)
+	}
+	flushed := flushToolSieve(&state, []string{"exec"})
+	if len(flushed) != 0 {
+		t.Fatalf("expected result history block to be swallowed, got %+v", flushed)
+	}
+}
diff --git a/internal/adapter/openai/tool_sieve_core.go b/internal/adapter/openai/tool_sieve_core.go
index 614b71d..83bfbb7 100644
--- a/internal/adapter/openai/tool_sieve_core.go
+++ b/internal/adapter/openai/tool_sieve_core.go
@@ -167,7 +167,7 @@ func findToolSegmentStart(s string) int {
 		return -1
 	}
 	lower := strings.ToLower(s)
-	keywords := []string{"tool_calls", "function.name:", "[tool_call_history]"}
+	keywords := []string{"tool_calls", "function.name:", "[tool_call_history]", "[tool_result_history]"}
 	bestKeyIdx := -1
 	for _, kw := range keywords {
 		idx := strings.Index(lower, kw)
@@ -196,7 +196,7 @@ func consumeToolCapture(state *toolStreamSieveState, toolNames []string) (prefix
 	lower := strings.ToLower(captured)
 
 	keyIdx := -1
-	keywords := []string{"tool_calls", "function.name:", "[tool_call_history]"}
+	keywords := []string{"tool_calls", "function.name:", "[tool_call_history]", "[tool_result_history]"}
 	for _, kw := range keywords {
 		idx := strings.Index(lower, kw)
 		if idx >= 0 && (keyIdx < 0 || idx < keyIdx) {
diff --git a/internal/js/helpers/stream-tool-sieve/sieve.js b/internal/js/helpers/stream-tool-sieve/sieve.js
index e247122..8613d7d 100644
--- a/internal/js/helpers/stream-tool-sieve/sieve.js
+++ b/internal/js/helpers/stream-tool-sieve/sieve.js
@@ -168,7 +168,7 @@ function findToolSegmentStart(s) {
     return -1;
   }
   const lower = s.toLowerCase();
-  const keywords = ['tool_calls', 'function.name:', '[tool_call_history]'];
+  const keywords = ['tool_calls', 'function.name:', '[tool_call_history]', '[tool_result_history]'];
   let offset = 0;
   // eslint-disable-next-line no-constant-condition
   while (true) {
@@ -207,7 +207,7 @@ function consumeToolCapture(state, toolNames) {
   const lower = captured.toLowerCase();
   
   let keyIdx = -1;
-  const keywords = ['tool_calls', 'function.name:', '[tool_call_history]'];
+  const keywords = ['tool_calls', 'function.name:', '[tool_call_history]', '[tool_result_history]'];
   for (const kw of keywords) {
     const idx = lower.indexOf(kw);
     if (idx >= 0 && (keyIdx < 0 || idx < keyIdx)) {
diff --git a/tests/node/stream-tool-sieve.test.js b/tests/node/stream-tool-sieve.test.js
index 5011de3..a4c793c 100644
--- a/tests/node/stream-tool-sieve.test.js
+++ b/tests/node/stream-tool-sieve.test.js
@@ -243,6 +243,23 @@ test('sieve swallows leaked TOOL_CALL_HISTORY marker blocks', () => {
   assert.equal(leakedText.includes('[TOOL_CALL_HISTORY]'), false);
 });
 
+test('sieve swallows leaked TOOL_RESULT_HISTORY marker blocks', () => {
+  const events = runSieve(
+    [
+      '前置文本。',
+      '[TOOL_RESULT_HISTORY]\nstatus: already_called\nfunction.name: exec\nfunction.arguments: {}\n[/TOOL_RESULT_HISTORY]',
+      '后置文本。',
+    ],
+    ['exec'],
+  );
+  const leakedText = collectText(events);
+  const hasToolCall = events.some((evt) => evt.type === 'tool_calls');
+  assert.equal(hasToolCall, false);
+  assert.equal(leakedText.includes('前置文本。'), true);
+  assert.equal(leakedText.includes('后置文本。'), true);
+  assert.equal(leakedText.includes('[TOOL_RESULT_HISTORY]'), false);
+});
+
 test('sieve intercepts rejected unknown tool payload (no args) without raw leak', () => {
   const events = runSieve(
     ['{"tool_calls":[{"name":"not_in_schema"}]}', '后置正文G。'],