diff --git a/extensions/acpx/src/runtime-internals/events.test.ts b/extensions/acpx/src/runtime-internals/events.test.ts
index 7329b9d1991..bb8067c3327 100644
--- a/extensions/acpx/src/runtime-internals/events.test.ts
+++ b/extensions/acpx/src/runtime-internals/events.test.ts
@@ -1,128 +1,63 @@
 import { describe, expect, it } from "vitest";
-import { PromptStreamProjector } from "./events.js";
+import { parsePromptEventLine } from "./events.js";
 
-function jsonLine(payload: unknown): string {
-  return JSON.stringify(payload);
-}
-
-function beginPrompt(projector: PromptStreamProjector, id = "req-1") {
-  projector.ingestLine(
-    jsonLine({
+describe("parsePromptEventLine", () => {
+  it("parses raw ACP session/update agent_message_chunk lines", () => {
+    const line = JSON.stringify({
       jsonrpc: "2.0",
-      id,
-      method: "session/prompt",
+      method: "session/update",
       params: {
-        sessionId: "session-1",
-        prompt: [{ type: "text", text: "hello" }],
+        sessionId: "s1",
+        update: {
+          sessionUpdate: "agent_message_chunk",
+          content: { type: "text", text: "hello" },
+        },
       },
-    }),
-  );
-}
-
-describe("PromptStreamProjector", () => {
-  it("maps agent message chunks to output deltas", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector);
-    const event = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "agent_message_chunk",
-            content: {
-              type: "text",
-              text: "hello world",
-            },
-          },
-        },
-      }),
-    );
-
-    expect(event).toEqual({
+    });
+    expect(parsePromptEventLine(line)).toEqual({
       type: "text_delta",
-      text: "hello world",
+      text: "hello",
       stream: "output",
       tag: "agent_message_chunk",
     });
   });
 
-  it("preserves leading spaces in streamed output chunks", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector);
-    const event = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "agent_message_chunk",
-            content: {
-              type: "text",
-              text: "  indented",
-            },
-          },
+  it("parses usage_update with stable metadata", () => {
+    const line = JSON.stringify({
+      jsonrpc: "2.0",
+      method: "session/update",
+      params: {
+        sessionId: "s1",
+        update: {
+          sessionUpdate: "usage_update",
+          used: 12,
+          size: 500,
         },
-      }),
-    );
-
-    expect(event).toEqual({
-      type: "text_delta",
-      text: "  indented",
-      stream: "output",
-      tag: "agent_message_chunk",
+      },
+    });
+    expect(parsePromptEventLine(line)).toEqual({
+      type: "status",
+      text: "usage updated: 12/500",
+      tag: "usage_update",
+      used: 12,
+      size: 500,
     });
   });
 
-  it("maps agent thought chunks to thought deltas", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector);
-    const event = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "agent_thought_chunk",
-            content: {
-              type: "text",
-              text: "thinking",
-            },
-          },
+  it("parses tool_call_update without using call ids as primary fallback label", () => {
+    const line = JSON.stringify({
+      jsonrpc: "2.0",
+      method: "session/update",
+      params: {
+        sessionId: "s1",
+        update: {
+          sessionUpdate: "tool_call_update",
+          toolCallId: "call_ABC123",
+          status: "in_progress",
         },
-      }),
-    );
-
-    expect(event).toEqual({
-      type: "text_delta",
-      text: "thinking",
-      stream: "thought",
-      tag: "agent_thought_chunk",
+      },
     });
-  });
-
-  it("maps tool call updates with metadata and stable fallback title", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector);
-    const event = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "tool_call_update",
-            toolCallId: "call_ABC123",
-            status: "in_progress",
-          },
-        },
-      }),
-    );
-
-    expect(event).toEqual({
+    expect(parsePromptEventLine(line)).toEqual({
       type: "tool_call",
       text: "tool call (in_progress)",
       tag: "tool_call_update",
@@ -132,159 +67,15 @@ describe("PromptStreamProjector", () => {
     });
   });
 
-  it("maps usage updates with numeric metadata", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector);
-    const event = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "usage_update",
-            used: 12,
-            size: 500,
-          },
-        },
-      }),
-    );
-
-    expect(event).toEqual({
-      type: "status",
-      text: "usage updated: 12/500",
-      tag: "usage_update",
-      used: 12,
-      size: 500,
-    });
-  });
-
-  it("ignores replayed updates before current prompt starts", () => {
-    const projector = new PromptStreamProjector();
-    const replayed = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "agent_message_chunk",
-            content: {
-              type: "text",
-              text: "old turn",
-            },
-          },
-        },
-      }),
-    );
-    beginPrompt(projector, "req-2");
-    const current = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "agent_message_chunk",
-            content: {
-              type: "text",
-              text: "new turn",
-            },
-          },
-        },
-      }),
-    );
-
-    expect(replayed).toBeNull();
-    expect(current).toEqual({
+  it("keeps compatibility with simplified text/done lines", () => {
+    expect(parsePromptEventLine(JSON.stringify({ type: "text", content: "alpha" }))).toEqual({
       type: "text_delta",
-      text: "new turn",
+      text: "alpha",
       stream: "output",
-      tag: "agent_message_chunk",
     });
-  });
-
-  it("maps prompt response stop reasons to done events", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector);
-    const event = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        id: "req-1",
-        result: {
-          stopReason: "end_turn",
-        },
-      }),
-    );
-
-    expect(event).toEqual({
+    expect(parsePromptEventLine(JSON.stringify({ type: "done", stopReason: "end_turn" }))).toEqual({
       type: "done",
       stopReason: "end_turn",
     });
   });
-
-  it("maps json-rpc errors to runtime errors", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector);
-    const event = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        id: "req-1",
-        error: {
-          code: -32000,
-          message: "adapter failed",
-        },
-      }),
-    );
-
-    expect(event).toEqual({
-      type: "error",
-      message: "adapter failed",
-      code: "-32000",
-    });
-  });
-
-  it("ignores non-prompt response errors", () => {
-    const projector = new PromptStreamProjector();
-    beginPrompt(projector, "3");
-    const loadError = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        id: 1,
-        error: {
-          code: -32002,
-          message: "Resource not found",
-        },
-      }),
-    );
-    const promptDone = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        id: 3,
-        result: {
-          stopReason: "end_turn",
-        },
-      }),
-    );
-    const trailingReplay = projector.ingestLine(
-      jsonLine({
-        jsonrpc: "2.0",
-        method: "session/update",
-        params: {
-          sessionId: "session-1",
-          update: {
-            sessionUpdate: "agent_message_chunk",
-            content: { type: "text", text: "should be ignored" },
-          },
-        },
-      }),
-    );
-
-    expect(loadError).toBeNull();
-    expect(promptDone).toEqual({
-      type: "done",
-      stopReason: "end_turn",
-    });
-    expect(trailingReplay).toBeNull();
-  });
 });
diff --git a/extensions/acpx/src/runtime-internals/events.ts b/extensions/acpx/src/runtime-internals/events.ts
index 986911bfdc0..4556cd0d9ca 100644
--- a/extensions/acpx/src/runtime-internals/events.ts
+++ b/extensions/acpx/src/runtime-internals/events.ts
@@ -1,13 +1,28 @@
 import type { AcpRuntimeEvent, AcpSessionUpdateTag } from "openclaw/plugin-sdk";
-import { isAcpJsonRpcMessage, normalizeJsonRpcId } from "./jsonrpc.js";
 import {
+  asOptionalBoolean,
   asOptionalString,
   asString,
   asTrimmedString,
+  type AcpxErrorEvent,
   type AcpxJsonObject,
   isRecord,
 } from "./shared.js";
 
+export function toAcpxErrorEvent(value: unknown): AcpxErrorEvent | null {
+  if (!isRecord(value)) {
+    return null;
+  }
+  if (asTrimmedString(value.type) !== "error") {
+    return null;
+  }
+  return {
+    message: asTrimmedString(value.message) || "acpx reported an error",
+    code: asOptionalString(value.code),
+    retryable: asOptionalBoolean(value.retryable),
+  };
+}
+
 export function parseJsonLines(value: string): AcpxJsonObject[] {
   const events: AcpxJsonObject[] = [];
   for (const line of value.split(/\r?\n/)) {
@@ -31,24 +46,95 @@ function asOptionalFiniteNumber(value: unknown): number | undefined {
   return typeof value === "number" && Number.isFinite(value) ? value : undefined;
 }
 
-function parsePromptStopReason(message: Record<string, unknown>): string | undefined {
-  if (!Object.hasOwn(message, "result")) {
-    return undefined;
+function resolveStructuredPromptPayload(parsed: Record<string, unknown>): {
+  type: string;
+  payload: Record<string, unknown>;
+  tag?: AcpSessionUpdateTag;
+} {
+  const method = asTrimmedString(parsed.method);
+  if (method === "session/update") {
+    const params = parsed.params;
+    if (isRecord(params) && isRecord(params.update)) {
+      const update = params.update;
+      const tag = asOptionalString(update.sessionUpdate) as AcpSessionUpdateTag | undefined;
+      return {
+        type: tag ?? "",
+        payload: update,
+        ...(tag ? { tag } : {}),
+      };
+    }
   }
-  const result = isRecord(message.result) ? message.result : null;
-  if (!result) {
-    return undefined;
+
+  const sessionUpdate = asOptionalString(parsed.sessionUpdate) as AcpSessionUpdateTag | undefined;
+  if (sessionUpdate) {
+    return {
+      type: sessionUpdate,
+      payload: parsed,
+      tag: sessionUpdate,
+    };
   }
-  const stopReason = asString(result.stopReason);
-  return stopReason && stopReason.trim().length > 0 ? stopReason : undefined;
+
+  const type = asTrimmedString(parsed.type);
+  const tag = asOptionalString(parsed.tag) as AcpSessionUpdateTag | undefined;
+  return {
+    type,
+    payload: parsed,
+    ...(tag ? { tag } : {}),
+  };
+}
+
+function resolveStatusTextForTag(params: {
+  tag: AcpSessionUpdateTag;
+  payload: Record<string, unknown>;
+}): string | null {
+  const { tag, payload } = params;
+  if (tag === "available_commands_update") {
+    const commands = Array.isArray(payload.availableCommands) ? payload.availableCommands : [];
+    return commands.length > 0
+      ? `available commands updated (${commands.length})`
+      : "available commands updated";
+  }
+  if (tag === "current_mode_update") {
+    const mode =
+      asTrimmedString(payload.currentModeId) ||
+      asTrimmedString(payload.modeId) ||
+      asTrimmedString(payload.mode);
+    return mode ? `mode updated: ${mode}` : "mode updated";
+  }
+  if (tag === "config_option_update") {
+    const id = asTrimmedString(payload.id) || asTrimmedString(payload.configOptionId);
+    const value =
+      asTrimmedString(payload.currentValue) ||
+      asTrimmedString(payload.value) ||
+      asTrimmedString(payload.optionValue);
+    if (id && value) {
+      return `config updated: ${id}=${value}`;
+    }
+    if (id) {
+      return `config updated: ${id}`;
+    }
+    return "config updated";
+  }
+  if (tag === "session_info_update") {
+    return (
+      asTrimmedString(payload.summary) || asTrimmedString(payload.message) || "session updated"
+    );
+  }
+  if (tag === "plan") {
+    const entries = Array.isArray(payload.entries) ? payload.entries : [];
+    const first = entries.find((entry) => isRecord(entry)) as Record<string, unknown> | undefined;
+    const content = asTrimmedString(first?.content);
+    return content ? `plan: ${content}` : null;
+  }
+  return null;
 }
 
 function resolveTextChunk(params: {
-  update: Record<string, unknown>;
+  payload: Record<string, unknown>;
   stream: "output" | "thought";
   tag: AcpSessionUpdateTag;
 }): AcpRuntimeEvent | null {
-  const contentRaw = params.update.content;
+  const contentRaw = params.payload.content;
   if (isRecord(contentRaw)) {
     const contentType = asTrimmedString(contentRaw.type);
     if (contentType && contentType !== "text") {
@@ -64,8 +150,7 @@ function resolveTextChunk(params: {
       };
     }
   }
-
-  const text = asString(params.update.text);
+  const text = asString(params.payload.text);
   if (!text || text.length === 0) {
     return null;
   }
@@ -77,106 +162,103 @@ function resolveTextChunk(params: {
   };
 }
 
-function resolveStatusTextForTag(params: {
-  tag: AcpSessionUpdateTag;
-  update: Record<string, unknown>;
-}): string | null {
-  const { tag, update } = params;
-  if (tag === "available_commands_update") {
-    const commands = Array.isArray(update.availableCommands) ? update.availableCommands : [];
-    return commands.length > 0
-      ? `available commands updated (${commands.length})`
-      : "available commands updated";
+export function parsePromptEventLine(line: string): AcpRuntimeEvent | null {
+  const trimmed = line.trim();
+  if (!trimmed) {
+    return null;
   }
-  if (tag === "current_mode_update") {
-    const mode =
-      asTrimmedString(update.currentModeId) ||
-      asTrimmedString(update.modeId) ||
-      asTrimmedString(update.mode);
-    return mode ? `mode updated: ${mode}` : "mode updated";
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(trimmed);
+  } catch {
+    return {
+      type: "status",
+      text: trimmed,
+    };
   }
-  if (tag === "config_option_update") {
-    const id = asTrimmedString(update.id) || asTrimmedString(update.configOptionId);
-    const value =
-      asTrimmedString(update.currentValue) ||
-      asTrimmedString(update.value) ||
-      asTrimmedString(update.optionValue);
-    if (id && value) {
-      return `config updated: ${id}=${value}`;
-    }
-    if (id) {
-      return `config updated: ${id}`;
-    }
-    return "config updated";
-  }
-  if (tag === "session_info_update") {
-    return asTrimmedString(update.summary) || asTrimmedString(update.message) || "session updated";
-  }
-  if (tag === "plan") {
-    const entries = Array.isArray(update.entries) ? update.entries : [];
-    const first = entries.find((entry) => isRecord(entry)) as Record<string, unknown> | undefined;
-    const content = asTrimmedString(first?.content);
-    if (!content) {
-      return "plan updated";
-    }
-    const status = asTrimmedString(first?.status);
-    return status ? `plan: [${status}] ${content}` : `plan: ${content}`;
-  }
-  return null;
-}
 
-function parseSessionUpdateEvent(message: Record<string, unknown>): AcpRuntimeEvent | null {
-  if (asTrimmedString(message.method) !== "session/update") {
-    return null;
-  }
-  const params = isRecord(message.params) ? message.params : null;
-  if (!params) {
-    return null;
-  }
-  const update = isRecord(params.update) ? params.update : null;
-  if (!update) {
+  if (!isRecord(parsed)) {
     return null;
   }
 
-  const tag = asOptionalString(update.sessionUpdate) as AcpSessionUpdateTag | undefined;
-  if (!tag) {
-    return null;
-  }
+  const structured = resolveStructuredPromptPayload(parsed);
+  const type = structured.type;
+  const payload = structured.payload;
+  const tag = structured.tag;
 
-  switch (tag) {
-    case "agent_message_chunk":
-      return resolveTextChunk({
-        update,
+  switch (type) {
+    case "text": {
+      const content = asString(payload.content);
+      if (content == null || content.length === 0) {
+        return null;
+      }
+      return {
+        type: "text_delta",
+        text: content,
         stream: "output",
-        tag,
-      });
-    case "agent_thought_chunk":
-      return resolveTextChunk({
-        update,
+        ...(tag ? { tag } : {}),
+      };
+    }
+    case "thought": {
+      const content = asString(payload.content);
+      if (content == null || content.length === 0) {
+        return null;
+      }
+      return {
+        type: "text_delta",
+        text: content,
         stream: "thought",
-        tag,
-      });
-    case "tool_call":
-    case "tool_call_update": {
-      const title = asTrimmedString(update.title) || "tool call";
-      const status = asTrimmedString(update.status);
-      const toolCallId = asOptionalString(update.toolCallId);
+        ...(tag ? { tag } : {}),
+      };
+    }
+    case "tool_call": {
+      const title = asTrimmedString(payload.title) || "tool call";
+      const status = asTrimmedString(payload.status);
+      const toolCallId = asOptionalString(payload.toolCallId);
       return {
         type: "tool_call",
         text: status ? `${title} (${status})` : title,
-        tag,
+        tag: (tag ?? "tool_call") as AcpSessionUpdateTag,
         ...(toolCallId ? { toolCallId } : {}),
         ...(status ? { status } : {}),
         title,
       };
     }
+    case "tool_call_update": {
+      const title = asTrimmedString(payload.title) || "tool call";
+      const status = asTrimmedString(payload.status);
+      const toolCallId = asOptionalString(payload.toolCallId);
+      const text = status ? `${title} (${status})` : title;
+      return {
+        type: "tool_call",
+        text,
+        tag: (tag ?? "tool_call_update") as AcpSessionUpdateTag,
+        ...(toolCallId ? { toolCallId } : {}),
+        ...(status ? { status } : {}),
+        title,
+      };
+    }
+    case "agent_message_chunk":
+      return resolveTextChunk({
+        payload,
+        stream: "output",
+        tag: "agent_message_chunk",
+      });
+    case "agent_thought_chunk":
+      return resolveTextChunk({
+        payload,
+        stream: "thought",
+        tag: "agent_thought_chunk",
+      });
     case "usage_update": {
-      const used = asOptionalFiniteNumber(update.used);
-      const size = asOptionalFiniteNumber(update.size);
+      const used = asOptionalFiniteNumber(payload.used);
+      const size = asOptionalFiniteNumber(payload.size);
+      const text =
+        used != null && size != null ? `usage updated: ${used}/${size}` : "usage updated";
       return {
         type: "status",
-        text: used != null && size != null ? `usage updated: ${used}/${size}` : "usage updated",
-        tag,
+        text,
+        tag: "usage_update",
         ...(used != null ? { used } : {}),
         ...(size != null ? { size } : {}),
       };
@@ -187,8 +269,8 @@ function parseSessionUpdateEvent(message: Record<string, unknown>): AcpRuntimeEv
     case "session_info_update":
     case "plan": {
       const text = resolveStatusTextForTag({
-        tag,
-        update,
+        tag: type as AcpSessionUpdateTag,
+        payload,
       });
       if (!text) {
         return null;
@@ -196,86 +278,42 @@ function parseSessionUpdateEvent(message: Record<string, unknown>): AcpRuntimeEv
       return {
         type: "status",
         text,
-        tag,
+        tag: type as AcpSessionUpdateTag,
+      };
+    }
+    case "client_operation": {
+      const method = asTrimmedString(payload.method) || "operation";
+      const status = asTrimmedString(payload.status);
+      const summary = asTrimmedString(payload.summary);
+      const text = [method, status, summary].filter(Boolean).join(" ");
+      if (!text) {
+        return null;
+      }
+      return { type: "status", text, ...(tag ? { tag } : {}) };
+    }
+    case "update": {
+      const update = asTrimmedString(payload.update);
+      if (!update) {
+        return null;
+      }
+      return { type: "status", text: update, ...(tag ? { tag } : {}) };
+    }
+    case "done": {
+      return {
+        type: "done",
+        stopReason: asOptionalString(payload.stopReason),
+      };
+    }
+    case "error": {
+      const message = asTrimmedString(payload.message) || "acpx runtime error";
+      return {
+        type: "error",
+        message,
+        code: asOptionalString(payload.code),
+        retryable: asOptionalBoolean(payload.retryable),
       };
     }
     default:
       return null;
   }
 }
-
-export class PromptStreamProjector {
-  private readonly promptRequestIds = new Set<string>();
-
-  ingestLine(line: string): AcpRuntimeEvent | null {
-    const trimmed = line.trim();
-    if (!trimmed) {
-      return null;
-    }
-    let parsed: unknown;
-    try {
-      parsed = JSON.parse(trimmed);
-    } catch {
-      return {
-        type: "status",
-        text: trimmed,
-      };
-    }
-
-    if (!isRecord(parsed) || !isAcpJsonRpcMessage(parsed)) {
-      return null;
-    }
-
-    if (asTrimmedString(parsed.method) === "session/prompt") {
-      const id = normalizeJsonRpcId(parsed.id);
-      if (id) {
-        this.promptRequestIds.add(id);
-      }
-      return null;
-    }
-
-    const updateEvent = parseSessionUpdateEvent(parsed);
-    if (updateEvent) {
-      return this.promptRequestIds.size > 0 ? updateEvent : null;
-    }
-
-    if (Object.hasOwn(parsed, "error")) {
-      if (!this.consumePromptResponse(parsed)) {
-        return null;
-      }
-      const error = isRecord(parsed.error) ? parsed.error : null;
-      const message = asTrimmedString(error?.message);
-      const codeValue = error?.code;
-      return {
-        type: "error",
-        message: message || "acpx runtime error",
-        code:
-          typeof codeValue === "number" && Number.isFinite(codeValue)
-            ? String(codeValue)
-            : asOptionalString(codeValue),
-      };
-    }
-
-    const stopReason = parsePromptStopReason(parsed);
-    if (!stopReason || !this.consumePromptResponse(parsed)) {
-      return null;
-    }
-
-    return {
-      type: "done",
-      stopReason,
-    };
-  }
-
-  private consumePromptResponse(message: Record<string, unknown>): boolean {
-    const id = normalizeJsonRpcId(message.id);
-    if (!id) {
-      return false;
-    }
-    if (!this.promptRequestIds.has(id)) {
-      return false;
-    }
-    this.promptRequestIds.delete(id);
-    return true;
-  }
-}
diff --git a/extensions/acpx/src/runtime-internals/test-fixtures.ts b/extensions/acpx/src/runtime-internals/test-fixtures.ts
index d056cdc3874..68e5c069749 100644
--- a/extensions/acpx/src/runtime-internals/test-fixtures.ts
+++ b/extensions/acpx/src/runtime-internals/test-fixtures.ts
@@ -185,12 +185,9 @@ if (command === "prompt") {
 
   if (stdinText.includes("trigger-error")) {
     emitJson({
-      jsonrpc: "2.0",
-      id: requestId,
-      error: {
-        code: -32000,
-        message: "mock failure",
-      },
+      type: "error",
+      code: "-32000",
+      message: "mock failure",
     });
     process.exit(1);
   }
@@ -208,13 +205,7 @@ if (command === "prompt") {
       sessionUpdate: "agent_message_chunk",
       content: { type: "text", text: " gamma" },
     });
-    emitJson({
-      jsonrpc: "2.0",
-      id: requestId,
-      result: {
-        stopReason: "end_turn",
-      },
-    });
+    emitJson({ type: "done", stopReason: "end_turn" });
     process.exit(0);
   }
 
@@ -223,20 +214,8 @@ if (command === "prompt") {
       sessionUpdate: "agent_message_chunk",
       content: { type: "text", text: "ok" },
     });
-    emitJson({
-      jsonrpc: "2.0",
-      id: requestId,
-      result: {
-        stopReason: "end_turn",
-      },
-    });
-    emitJson({
-      jsonrpc: "2.0",
-      id: requestId,
-      result: {
-        stopReason: "end_turn",
-      },
-    });
+    emitJson({ type: "done", stopReason: "end_turn" });
+    emitJson({ type: "done", stopReason: "end_turn" });
     process.exit(0);
   }
 
@@ -255,22 +234,15 @@ if (command === "prompt") {
     sessionUpdate: "agent_message_chunk",
     content: { type: "text", text: "echo:" + stdinText.trim() },
   });
-  emitJson({
-    jsonrpc: "2.0",
-    id: requestId,
-    result: {
-      stopReason: "end_turn",
-    },
-  });
+  emitJson({ type: "done", stopReason: "end_turn" });
   process.exit(0);
 }
 
 writeLog({ kind: "unknown", args });
 emitJson({
-  error: {
-    code: "USAGE",
-    message: "unknown command",
-  },
+  type: "error",
+  code: "USAGE",
+  message: "unknown command",
 });
 process.exit(2);
 `;
diff --git a/extensions/acpx/src/runtime.test.ts b/extensions/acpx/src/runtime.test.ts
index 05c7e65268d..6539df987c6 100644
--- a/extensions/acpx/src/runtime.test.ts
+++ b/extensions/acpx/src/runtime.test.ts
@@ -66,20 +66,32 @@ describe("AcpxRuntime", () => {
       events.push(event);
     }
 
-    expect(events).toContainEqual({
-      type: "text_delta",
-      text: "thinking",
-      stream: "thought",
-    });
-    expect(events).toContainEqual({
-      type: "tool_call",
-      text: "run-tests (in_progress)",
-    });
-    expect(events).toContainEqual({
-      type: "text_delta",
-      text: "echo:hello world",
-      stream: "output",
-    });
+    expect(events).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          type: "text_delta",
+          text: "thinking",
+          stream: "thought",
+        }),
+      ]),
+    );
+    expect(events).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          type: "tool_call",
+          text: "run-tests (in_progress)",
+        }),
+      ]),
+    );
+    expect(events).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          type: "text_delta",
+          text: "echo:hello world",
+          stream: "output",
+        }),
+      ]),
+    );
     expect(events).toContainEqual({
       type: "done",
       stopReason: "end_turn",
diff --git a/extensions/acpx/src/runtime.ts b/extensions/acpx/src/runtime.ts
index 5c9a4d890a2..d83aacdbb24 100644
--- a/extensions/acpx/src/runtime.ts
+++ b/extensions/acpx/src/runtime.ts
@@ -14,8 +14,11 @@ import type {
 import { AcpRuntimeError } from "openclaw/plugin-sdk";
 import { type ResolvedAcpxPluginConfig } from "./config.js";
 import { checkAcpxVersion } from "./ensure.js";
-import { parseControlJsonError } from "./runtime-internals/control-errors.js";
-import { parseJsonLines, PromptStreamProjector } from "./runtime-internals/events.js";
+import {
+  parseJsonLines,
+  parsePromptEventLine,
+  toAcpxErrorEvent,
+} from "./runtime-internals/events.js";
 import {
   resolveSpawnFailure,
   spawnAndCollect,
@@ -194,7 +197,6 @@ export class AcpxRuntime implements AcpRuntime {
       sessionName: state.name,
       cwd: state.cwd,
     });
-    const projector = new PromptStreamProjector();
 
     const cancelOnAbort = async () => {
       await this.cancel({
@@ -236,7 +238,7 @@ export class AcpxRuntime implements AcpRuntime {
     const lines = createInterface({ input: child.stdout });
     try {
       for await (const line of lines) {
-        const parsed = projector.ingestLine(line);
+        const parsed = parsePromptEventLine(line);
         if (!parsed) {
           continue;
         }
@@ -307,7 +309,7 @@ export class AcpxRuntime implements AcpRuntime {
       fallbackCode: "ACP_TURN_FAILED",
       ignoreNoSession: true,
     });
-    const detail = events.find((event) => !parseControlJsonError(event)) ?? events[0];
+    const detail = events.find((event) => !toAcpxErrorEvent(event)) ?? events[0];
     if (!detail) {
       return {
         summary: "acpx status unavailable",
@@ -553,7 +555,7 @@ export class AcpxRuntime implements AcpRuntime {
     }
 
     const events = parseJsonLines(result.stdout);
-    const errorEvent = events.map((event) => parseControlJsonError(event)).find(Boolean) ?? null;
+    const errorEvent = events.map((event) => toAcpxErrorEvent(event)).find(Boolean) ?? null;
     if (errorEvent) {
       if (params.ignoreNoSession && errorEvent.code === "NO_SESSION") {
         return events;