diff --git a/src/agents/agent-tools.abort.ts b/src/agents/agent-tools.abort.ts
index 7f29222455e4..31587f4876bf 100644
--- a/src/agents/agent-tools.abort.ts
+++ b/src/agents/agent-tools.abort.ts
@@ -1,6 +1,7 @@
 import { copyPluginToolMeta } from "../plugins/tools.js";
 import { bindAbortRelay } from "../utils/fetch-timeout.js";
 import { copyBeforeToolCallHookMarker } from "./agent-tools.before-tool-call.js";
+import { cloneToolWithExecute } from "./agent-tools.clone.js";
 import type { AnyAgentTool } from "./agent-tools.types.js";
 import { copyChannelAgentToolMeta } from "./channel-tools.js";
 
@@ -57,16 +58,16 @@ export function wrapToolWithAbortSignal(
   if (!execute) {
     return tool;
   }
-  const wrappedTool: AnyAgentTool = {
-    ...tool,
-    execute: async (toolCallId, params, signal, onUpdate) => {
+  const wrappedTool = cloneToolWithExecute(
+    tool,
+    async (toolCallId, params, signal, onUpdate) => {
       const combined = combineAbortSignals(signal, abortSignal);
       if (combined?.aborted) {
         throwAbortError();
       }
       return await execute(toolCallId, params, combined, onUpdate);
     },
-  };
+  );
   copyPluginToolMeta(tool, wrappedTool);
   copyChannelAgentToolMeta(tool as never, wrappedTool as never);
   copyBeforeToolCallHookMarker(tool, wrappedTool);
diff --git a/src/agents/agent-tools.before-tool-call.ts b/src/agents/agent-tools.before-tool-call.ts
index 73590f8ba023..3758961d577a 100644
--- a/src/agents/agent-tools.before-tool-call.ts
+++ b/src/agents/agent-tools.before-tool-call.ts
@@ -48,6 +48,7 @@ import { resolveSkillWorkshopToolApproval } from "../skills/workshop/policy.js";
 import { isPlainObject } from "../utils.js";
 import { adjustedParamsByToolCallId } from "./agent-tools.before-tool-call.state.js";
 import { copyChannelAgentToolMeta, getChannelAgentToolMeta } from "./channel-tools.js";
+import { cloneToolWithExecute } from "./agent-tools.clone.js";
 import {
   getCodeModeExecBeforeHookMetadata,
   getCodeModeExecBeforeHookMetadataForToolKind,
@@ -1103,9 +1104,9 @@ export function wrapToolWithBeforeToolCallHook(
     ...(options.approvalMode ? { approvalMode: options.approvalMode } : {}),
     emitDiagnostics: options.emitDiagnostics !== false,
   };
-  const wrappedTool: AnyAgentTool = {
-    ...tool,
-    execute: async (toolCallId, params, signal, onUpdate) => {
+  const wrappedTool = cloneToolWithExecute(
+    tool,
+    async (toolCallId, params, signal, onUpdate) => {
       const prepare = (tool as BeforeToolCallPreparingTool).prepareBeforeToolCallParams;
       const preparedParams = prepare
         ? await prepare(params, {
@@ -1250,7 +1251,7 @@ export function wrapToolWithBeforeToolCallHook(
         throw err;
       }
     },
-  };
+  );
   copyPluginToolMeta(tool, wrappedTool);
   copyChannelAgentToolMeta(tool as never, wrappedTool as never);
   Object.defineProperty(wrappedTool, BEFORE_TOOL_CALL_WRAPPED, {
diff --git a/src/agents/agent-tools.clone.ts b/src/agents/agent-tools.clone.ts
new file mode 100644
index 000000000000..4b154444448a
--- /dev/null
+++ b/src/agents/agent-tools.clone.ts
@@ -0,0 +1,39 @@
+import type { AnyAgentTool } from "./agent-tools.types.js";
+
+export function cloneToolWithExecute(
+  tool: AnyAgentTool,
+  execute: AnyAgentTool["execute"],
+): AnyAgentTool {
+  const descriptorTarget = Object.create(Object.getPrototypeOf(tool)) as AnyAgentTool;
+  const descriptors: PropertyDescriptorMap = { ...Object.getOwnPropertyDescriptors(tool) };
+  delete descriptors.execute;
+  Object.defineProperties(descriptorTarget, descriptors);
+  Object.defineProperty(descriptorTarget, "execute", {
+    value: execute,
+    enumerable: true,
+    configurable: true,
+    writable: true,
+  });
+
+  const localProperties = new Set<PropertyKey>(["execute"]);
+  // Keep own descriptors on the wrapper for enumeration and marker writes, but
+  // read source properties with the original receiver so class/proxy accessors keep their state.
+  return new Proxy(descriptorTarget, {
+    defineProperty(target, property, descriptor) {
+      localProperties.add(property);
+      return Reflect.defineProperty(target, property, descriptor);
+    },
+    get(target, property, receiver) {
+      if (localProperties.has(property)) {
+        return Reflect.get(target, property, receiver);
+      }
+      return Reflect.get(tool, property, tool);
+    },
+    set(target, property, value, receiver) {
+      if (localProperties.has(property)) {
+        return Reflect.set(target, property, value, receiver);
+      }
+      return Reflect.set(tool, property, value, tool);
+    },
+  });
+}
diff --git a/src/agents/agent-tools.schema.test.ts b/src/agents/agent-tools.schema.test.ts
index 92edcf84e568..8778091980d5 100644
--- a/src/agents/agent-tools.schema.test.ts
+++ b/src/agents/agent-tools.schema.test.ts
@@ -2,7 +2,11 @@ import { runAgentLoop, type AgentEvent, type StreamFn } from "openclaw/plugin-sd
 import { createAssistantMessageEventStream, validateToolArguments } from "openclaw/plugin-sdk/llm";
 import { Type, type TSchema } from "typebox";
 import { describe, expect, it, vi } from "vitest";
-import { wrapToolWithBeforeToolCallHook } from "./agent-tools.before-tool-call.js";
+import {
+  isToolWrappedWithBeforeToolCallHook,
+  wrapToolWithBeforeToolCallHook,
+} from "./agent-tools.before-tool-call.js";
+import { wrapToolWithAbortSignal } from "./agent-tools.abort.js";
 import {
   cleanToolSchemaForGemini,
   normalizeToolParameterSchema,
@@ -650,6 +654,64 @@ function makeTool(parameters: TSchema): AnyAgentTool {
 }
 
 describe("normalizeToolParameters", () => {
+  it("leaves unreadable parameter descriptors for runtime projection diagnostics", () => {
+    const tool: AnyAgentTool = {
+      name: "fuzzplugin_unreadable",
+      label: "fuzzplugin_unreadable",
+      description: "Bad plugin tool",
+      parameters: { type: "object", properties: {} },
+      execute: vi.fn(),
+    };
+    Object.defineProperty(tool, "parameters", {
+      enumerable: true,
+      get() {
+        throw new Error("fuzzplugin parameters getter exploded");
+      },
+    });
+    Object.defineProperty(tool, "execute", {
+      value: vi.fn(),
+      enumerable: true,
+      configurable: false,
+      writable: false,
+    });
+
+    const normalized = normalizeToolParameters(tool);
+    const hooked = wrapToolWithBeforeToolCallHook(normalized);
+    const wrapped = wrapToolWithAbortSignal(hooked, new AbortController().signal);
+
+    const parametersDescriptor = Object.getOwnPropertyDescriptor(wrapped, "parameters");
+    const readParameters = parametersDescriptor?.get?.bind(wrapped);
+    expect(isToolWrappedWithBeforeToolCallHook(wrapped)).toBe(true);
+    expect(readParameters).toBeTypeOf("function");
+    expect(() => readParameters?.()).toThrow("fuzzplugin parameters getter exploded");
+  });
+
+  it("preserves class-backed tool accessors through runtime wrappers", () => {
+    class ClassBackedTool {
+      readonly name = "class_tool";
+      readonly label = "Class tool";
+      readonly description = "Class-backed plugin tool";
+      readonly #parameters = {
+        type: "object",
+        properties: {
+          q: { type: "string" },
+        },
+      };
+      readonly execute = vi.fn();
+
+      get parameters(): unknown {
+        return this.#parameters;
+      }
+    }
+
+    const tool = new ClassBackedTool() as AnyAgentTool;
+    const hooked = wrapToolWithBeforeToolCallHook(tool);
+    const wrapped = wrapToolWithAbortSignal(hooked, new AbortController().signal);
+
+    expect(wrapped.name).toBe("class_tool");
+    expect(wrapped.parameters).toEqual(tool.parameters);
+  });
+
   it("normalizes truly empty schemas to type:object with properties:{} (MCP parameter-free tools)", () => {
     const tool: AnyAgentTool = {
       name: "get_flux_instance",
diff --git a/src/agents/agent-tools.schema.ts b/src/agents/agent-tools.schema.ts
index 0acfcaa48f97..c2fc822797a4 100644
--- a/src/agents/agent-tools.schema.ts
+++ b/src/agents/agent-tools.schema.ts
@@ -8,6 +8,8 @@ import { copyChannelAgentToolMeta } from "./channel-tools.js";
 
 export { normalizeToolParameterSchema };
 
+type ToolParametersRead = { readable: true; value: unknown } | { readable: false };
+
 function isObjectSchemaWithNoRequiredParams(schema: unknown): boolean {
   if (!schema || typeof schema !== "object" || Array.isArray(schema)) {
     return false;
@@ -59,6 +61,14 @@ function addEmptyObjectArgumentPreparation(tool: AnyAgentTool, parameters: unkno
   };
 }
 
+function readToolParameters(tool: AnyAgentTool): ToolParametersRead {
+  try {
+    return { readable: true, value: tool.parameters };
+  } catch {
+    return { readable: false };
+  }
+}
+
 export function normalizeToolParameters(
   tool: AnyAgentTool,
   options?: ToolParameterSchemaOptions,
@@ -68,9 +78,13 @@ export function normalizeToolParameters(
     copyChannelAgentToolMeta(tool as never, target as never);
     return target;
   }
+  const parametersRead = readToolParameters(tool);
+  if (!parametersRead.readable) {
+    return tool;
+  }
   const schema =
-    tool.parameters && typeof tool.parameters === "object"
-      ? (tool.parameters as Record<string, unknown>)
+    parametersRead.value && typeof parametersRead.value === "object"
+      ? (parametersRead.value as Record<string, unknown>)
       : undefined;
   if (!schema) {
     return tool;