diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a71d4a972c..4ba97974cd9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- OpenAI/Responses WebSocket tool-call id hygiene: normalize blank/whitespace streamed tool-call ids before persistence, and block empty `function_call_output.call_id` payloads in the WS conversion path to avoid OpenAI 400 errors (`Invalid 'input[n].call_id': empty string`), with regression coverage for both inbound stream normalization and outbound payload guards.
 - Gateway/Control UI basePath webhook passthrough: let non-read methods under configured `controlUiBasePath` fall through to plugin routes (instead of returning Control UI 405), restoring webhook handlers behind basePath mounts. (#32311) Thanks @ademczuk.
 - Models/config env propagation: apply `config.env.vars` before implicit provider discovery in models bootstrap so config-scoped credentials are visible to implicit provider resolution paths. (#32295) Thanks @hsiaoa.
 - Hooks/runtime stability: keep the internal hook handler registry on a `globalThis` singleton so hook registration/dispatch remains consistent when bundling emits duplicate module copies. (#32292) Thanks @Drickon.
diff --git a/src/agents/openai-ws-stream.test.ts b/src/agents/openai-ws-stream.test.ts
index d65670dcd0f..e8be72691da 100644
--- a/src/agents/openai-ws-stream.test.ts
+++ b/src/agents/openai-ws-stream.test.ts
@@ -424,6 +424,41 @@ describe("convertMessagesToInputItems", () => {
     });
   });
 
+  it("drops tool result messages with empty tool call id", () => {
+    const msg = {
+      role: "toolResult" as const,
+      toolCallId: "   ",
+      toolName: "test_tool",
+      content: [{ type: "text", text: "output" }],
+      isError: false,
+      timestamp: 0,
+    };
+    const items = convertMessagesToInputItems([msg] as Parameters<
+      typeof convertMessagesToInputItems
+    >[0]);
+    expect(items).toEqual([]);
+  });
+
+  it("falls back to toolUseId when toolCallId is missing", () => {
+    const msg = {
+      role: "toolResult" as const,
+      toolUseId: "call_from_tool_use",
+      toolName: "test_tool",
+      content: [{ type: "text", text: "ok" }],
+      isError: false,
+      timestamp: 0,
+    };
+    const items = convertMessagesToInputItems([msg] as Parameters<
+      typeof convertMessagesToInputItems
+    >[0]);
+    expect(items).toHaveLength(1);
+    expect(items[0]).toMatchObject({
+      type: "function_call_output",
+      call_id: "call_from_tool_use",
+      output: "ok",
+    });
+  });
+
   it("converts a full multi-turn conversation", () => {
     const messages: FakeMessage[] = [
       userMsg("Run ls"),
@@ -454,6 +489,14 @@ describe("convertMessagesToInputItems", () => {
     expect(items[0]?.type).toBe("function_call");
   });
 
+  it("drops assistant tool calls with empty ids", () => {
+    const msg = assistantMsg([], [{ id: "   ", name: "read", args: { path: "/tmp/a" } }]);
+    const items = convertMessagesToInputItems([msg] as Parameters<
+      typeof convertMessagesToInputItems
+    >[0]);
+    expect(items).toEqual([]);
+  });
+
   it("skips thinking blocks in assistant messages", () => {
     const msg = {
       role: "assistant" as const,
diff --git a/src/agents/openai-ws-stream.ts b/src/agents/openai-ws-stream.ts
index 4563f2e3781..b7449f30991 100644
--- a/src/agents/openai-ws-stream.ts
+++ b/src/agents/openai-ws-stream.ts
@@ -101,6 +101,14 @@ export function hasWsSession(sessionId: string): boolean {
 
 type AnyMessage = Message & { role: string; content: unknown };
 
+function toNonEmptyString(value: unknown): string | null {
+  if (typeof value !== "string") {
+    return null;
+  }
+  const trimmed = value.trim();
+  return trimmed.length > 0 ? trimmed : null;
+}
+
 /** Convert pi-ai content (string | ContentPart[]) to plain text. */
 function contentToText(content: unknown): string {
   if (typeof content === "string") {
@@ -211,11 +219,16 @@ export function convertMessagesToInputItems(messages: Message[]): InputItem[] {
               });
               textParts.length = 0;
             }
+            const callId = toNonEmptyString(block.id);
+            const toolName = toNonEmptyString(block.name);
+            if (!callId || !toolName) {
+              continue;
+            }
             // Push function_call item
             items.push({
               type: "function_call",
-              call_id: typeof block.id === "string" ? block.id : `call_${randomUUID()}`,
-              name: block.name ?? "",
+              call_id: callId,
+              name: toolName,
               arguments:
                 typeof block.arguments === "string"
                   ? block.arguments
@@ -245,14 +258,19 @@ export function convertMessagesToInputItems(messages: Message[]): InputItem[] {
 
     if (m.role === "toolResult") {
       const tr = m as unknown as {
-        toolCallId: string;
+        toolCallId?: string;
+        toolUseId?: string;
         content: unknown;
         isError: boolean;
       };
+      const callId = toNonEmptyString(tr.toolCallId) ?? toNonEmptyString(tr.toolUseId);
+      if (!callId) {
+        continue;
+      }
       const outputText = contentToText(tr.content);
       items.push({
         type: "function_call_output",
-        call_id: tr.toolCallId,
+        call_id: callId,
         output: outputText,
       });
       continue;
@@ -280,10 +298,14 @@ export function buildAssistantMessageFromResponse(
         }
       }
     } else if (item.type === "function_call") {
+      const toolName = toNonEmptyString(item.name);
+      if (!toolName) {
+        continue;
+      }
       content.push({
         type: "toolCall",
-        id: item.call_id,
-        name: item.name,
+        id: toNonEmptyString(item.call_id) ?? `call_${randomUUID()}`,
+        name: toolName,
         arguments: (() => {
           try {
             return JSON.parse(item.arguments) as Record<string, unknown>;
diff --git a/src/agents/pi-embedded-runner/run/attempt.test.ts b/src/agents/pi-embedded-runner/run/attempt.test.ts
index 41750595b98..2a4a042aeaf 100644
--- a/src/agents/pi-embedded-runner/run/attempt.test.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.test.ts
@@ -244,6 +244,54 @@ describe("wrapStreamFnTrimToolCallNames", () => {
     expect(finalToolCall.name).toBe("\t  ");
     expect(baseFn).toHaveBeenCalledTimes(1);
   });
+
+  it("assigns fallback ids to missing/blank tool call ids in streamed and final messages", async () => {
+    const partialToolCall = { type: "toolCall", name: " read ", id: "   " };
+    const finalToolCallA = { type: "toolCall", name: " exec ", id: "" };
+    const finalToolCallB = { type: "toolCall", name: " write " };
+    const event = {
+      type: "toolcall_delta",
+      partial: { role: "assistant", content: [partialToolCall] },
+    };
+    const finalMessage = { role: "assistant", content: [finalToolCallA, finalToolCallB] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [event],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn);
+    for await (const _item of stream) {
+      // drain
+    }
+    const result = await stream.result();
+
+    expect(partialToolCall.name).toBe("read");
+    expect(partialToolCall.id).toBe("call_auto_1");
+    expect(finalToolCallA.name).toBe("exec");
+    expect(finalToolCallA.id).toBe("call_auto_1");
+    expect(finalToolCallB.name).toBe("write");
+    expect(finalToolCallB.id).toBe("call_auto_2");
+    expect(result).toBe(finalMessage);
+  });
+
+  it("trims surrounding whitespace on tool call ids", async () => {
+    const finalToolCall = { type: "toolCall", name: " read ", id: "  call_42  " };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn);
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("read");
+    expect(finalToolCall.id).toBe("call_42");
+  });
 });
 
 describe("isOllamaCompatProvider", () => {
diff --git a/src/agents/pi-embedded-runner/run/attempt.ts b/src/agents/pi-embedded-runner/run/attempt.ts
index 5acd5cdaaab..77b466b5730 100644
--- a/src/agents/pi-embedded-runner/run/attempt.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.ts
@@ -259,6 +259,64 @@ function normalizeToolCallNameForDispatch(rawName: string, allowedToolNames?: Se
   return caseInsensitiveMatch ?? trimmed;
 }
 
+function isToolCallBlockType(type: unknown): boolean {
+  return type === "toolCall" || type === "toolUse" || type === "functionCall";
+}
+
+function normalizeToolCallIdsInMessage(message: unknown): void {
+  if (!message || typeof message !== "object") {
+    return;
+  }
+  const content = (message as { content?: unknown }).content;
+  if (!Array.isArray(content)) {
+    return;
+  }
+
+  const usedIds = new Set<string>();
+  for (const block of content) {
+    if (!block || typeof block !== "object") {
+      continue;
+    }
+    const typedBlock = block as { type?: unknown; id?: unknown };
+    if (!isToolCallBlockType(typedBlock.type) || typeof typedBlock.id !== "string") {
+      continue;
+    }
+    const trimmedId = typedBlock.id.trim();
+    if (!trimmedId) {
+      continue;
+    }
+    usedIds.add(trimmedId);
+  }
+
+  let fallbackIndex = 1;
+  for (const block of content) {
+    if (!block || typeof block !== "object") {
+      continue;
+    }
+    const typedBlock = block as { type?: unknown; id?: unknown };
+    if (!isToolCallBlockType(typedBlock.type)) {
+      continue;
+    }
+    if (typeof typedBlock.id === "string") {
+      const trimmedId = typedBlock.id.trim();
+      if (trimmedId) {
+        if (typedBlock.id !== trimmedId) {
+          typedBlock.id = trimmedId;
+        }
+        usedIds.add(trimmedId);
+        continue;
+      }
+    }
+
+    let fallbackId = "";
+    while (!fallbackId || usedIds.has(fallbackId)) {
+      fallbackId = `call_auto_${fallbackIndex++}`;
+    }
+    typedBlock.id = fallbackId;
+    usedIds.add(fallbackId);
+  }
+}
+
 export function resolveOllamaBaseUrlForRun(params: {
   modelBaseUrl?: string;
   providerBaseUrl?: string;
@@ -298,6 +356,7 @@ function trimWhitespaceFromToolCallNamesInMessage(
       typedBlock.name = normalized;
     }
   }
+  normalizeToolCallIdsInMessage(message);
 }
 
 function wrapStreamTrimToolCallNames(