diff --git a/extensions/openai/index.test.ts b/extensions/openai/index.test.ts
index 91f74867882..495b040ea4c 100644
--- a/extensions/openai/index.test.ts
+++ b/extensions/openai/index.test.ts
@@ -263,6 +263,84 @@ describe("openai plugin", () => {
     ).toBeLessThan(runtimeMocks.refreshOpenAICodexToken.mock.invocationCallOrder[0]);
   });
 
+  it("registers provider-owned OpenAI tool compat hooks for openai and codex", async () => {
+    const { providers } = await registerOpenAIPluginWithHook();
+    const openaiProvider = requireRegisteredProvider(providers, "openai");
+    const codexProvider = requireRegisteredProvider(providers, "openai-codex");
+    const noParamsTool = {
+      name: "ping",
+      description: "",
+      parameters: {},
+      execute: vi.fn(),
+    } as never;
+
+    const normalizedOpenAI = openaiProvider.normalizeToolSchemas?.({
+      provider: "openai",
+      modelId: "gpt-5.4",
+      modelApi: "openai-responses",
+      model: {
+        provider: "openai",
+        api: "openai-responses",
+        baseUrl: "https://api.openai.com/v1",
+        id: "gpt-5.4",
+      } as never,
+      tools: [noParamsTool],
+    } as never);
+    const normalizedCodex = codexProvider.normalizeToolSchemas?.({
+      provider: "openai-codex",
+      modelId: "gpt-5.4",
+      modelApi: "openai-codex-responses",
+      model: {
+        provider: "openai-codex",
+        api: "openai-codex-responses",
+        baseUrl: "https://chatgpt.com/backend-api",
+        id: "gpt-5.4",
+      } as never,
+      tools: [noParamsTool],
+    } as never);
+
+    expect(normalizedOpenAI?.[0]?.parameters).toEqual({
+      type: "object",
+      properties: {},
+      required: [],
+      additionalProperties: false,
+    });
+    expect(normalizedCodex?.[0]?.parameters).toEqual({
+      type: "object",
+      properties: {},
+      required: [],
+      additionalProperties: false,
+    });
+    expect(
+      openaiProvider.inspectToolSchemas?.({
+        provider: "openai",
+        modelId: "gpt-5.4",
+        modelApi: "openai-responses",
+        model: {
+          provider: "openai",
+          api: "openai-responses",
+          baseUrl: "https://api.openai.com/v1",
+          id: "gpt-5.4",
+        } as never,
+        tools: [noParamsTool],
+      } as never),
+    ).toEqual([]);
+    expect(
+      codexProvider.inspectToolSchemas?.({
+        provider: "openai-codex",
+        modelId: "gpt-5.4",
+        modelApi: "openai-codex-responses",
+        model: {
+          provider: "openai-codex",
+          api: "openai-codex-responses",
+          baseUrl: "https://chatgpt.com/backend-api",
+          id: "gpt-5.4",
+        } as never,
+        tools: [noParamsTool],
+      } as never),
+    ).toEqual([]);
+  });
+
   it("registers GPT-5 system prompt contributions when the friendly overlay is enabled", async () => {
     const { on, providers } = await registerOpenAIPluginWithHook({
       pluginConfig: { personality: "friendly" },
diff --git a/extensions/openai/index.ts b/extensions/openai/index.ts
index cfaa2ae3d69..822bb0bbedb 100644
--- a/extensions/openai/index.ts
+++ b/extensions/openai/index.ts
@@ -1,4 +1,5 @@
 import { definePluginEntry } from "openclaw/plugin-sdk/plugin-entry";
+import { buildProviderToolCompatFamilyHooks } from "openclaw/plugin-sdk/provider-tools";
 import { buildOpenAICodexCliBackend } from "./cli-backend.js";
 import { buildOpenAIImageGenerationProvider } from "./image-generation-provider.js";
 import {
@@ -22,10 +23,12 @@ export default definePluginEntry({
   description: "Bundled OpenAI provider plugins",
   register(api) {
     const promptOverlayMode = resolveOpenAIPromptOverlayMode(api.pluginConfig);
+    const openAIToolCompatHooks = buildProviderToolCompatFamilyHooks("openai");
     const buildProviderWithPromptContribution = <T extends ReturnType<typeof buildOpenAIProvider>>(
       provider: T,
     ): T => ({
       ...provider,
+      ...openAIToolCompatHooks,
       resolveSystemPromptContribution: (ctx) =>
         resolveOpenAISystemPromptContribution({
           mode: promptOverlayMode,
diff --git a/src/plugin-sdk/provider-tools.test.ts b/src/plugin-sdk/provider-tools.test.ts
index 557f23f3b65..153713f87ce 100644
--- a/src/plugin-sdk/provider-tools.test.ts
+++ b/src/plugin-sdk/provider-tools.test.ts
@@ -3,7 +3,9 @@ import {
   applyXaiModelCompat,
   buildProviderToolCompatFamilyHooks,
   inspectGeminiToolSchemas,
+  inspectOpenAIToolSchemas,
   normalizeGeminiToolSchemas,
+  normalizeOpenAIToolSchemas,
   resolveXaiModelCompatPatch,
 } from "./provider-tools.js";
 
@@ -15,6 +17,11 @@ describe("buildProviderToolCompatFamilyHooks", () => {
         normalizeToolSchemas: normalizeGeminiToolSchemas,
         inspectToolSchemas: inspectGeminiToolSchemas,
       },
+      {
+        family: "openai" as const,
+        normalizeToolSchemas: normalizeOpenAIToolSchemas,
+        inspectToolSchemas: inspectOpenAIToolSchemas,
+      },
     ];
 
     for (const testCase of cases) {
@@ -25,6 +32,181 @@ describe("buildProviderToolCompatFamilyHooks", () => {
     }
   });
 
+  it("normalizes parameter-free and typed-object schemas for the openai family", () => {
+    const hooks = buildProviderToolCompatFamilyHooks("openai");
+    const tools = [
+      { name: "ping", description: "", parameters: {} },
+      { name: "exec", description: "", parameters: { type: "object" } },
+    ] as never;
+
+    const normalized = hooks.normalizeToolSchemas({
+      provider: "openai",
+      modelId: "gpt-5.4",
+      modelApi: "openai-responses",
+      model: {
+        provider: "openai",
+        api: "openai-responses",
+        baseUrl: "https://api.openai.com/v1",
+        id: "gpt-5.4",
+      } as never,
+      tools,
+    });
+
+    expect(normalized.map((tool) => tool.parameters)).toEqual([
+      { type: "object", properties: {}, required: [], additionalProperties: false },
+      { type: "object", properties: {}, required: [], additionalProperties: false },
+    ]);
+    expect(
+      hooks.inspectToolSchemas({
+        provider: "openai",
+        modelId: "gpt-5.4",
+        modelApi: "openai-responses",
+        model: {
+          provider: "openai",
+          api: "openai-responses",
+          baseUrl: "https://api.openai.com/v1",
+          id: "gpt-5.4",
+        } as never,
+        tools,
+      }),
+    ).toEqual([]);
+  });
+
+  it("does not tighten permissive object schemas just to satisfy strict mode", () => {
+    const hooks = buildProviderToolCompatFamilyHooks("openai");
+    const permissiveParameters = {
+      type: "object",
+      properties: {
+        action: { type: "string" },
+        schedule: { type: "string" },
+      },
+      required: ["action"],
+      additionalProperties: true,
+    };
+    const permissiveTool = {
+      name: "cron",
+      description: "",
+      parameters: permissiveParameters,
+    } as never;
+
+    const normalized = hooks.normalizeToolSchemas({
+      provider: "openai",
+      modelId: "gpt-5.4",
+      modelApi: "openai-responses",
+      model: {
+        provider: "openai",
+        api: "openai-responses",
+        baseUrl: "https://api.openai.com/v1",
+        id: "gpt-5.4",
+      } as never,
+      tools: [permissiveTool],
+    });
+
+    expect(normalized[0]?.parameters).toEqual(permissiveParameters);
+    expect(
+      hooks.inspectToolSchemas({
+        provider: "openai",
+        modelId: "gpt-5.4",
+        modelApi: "openai-responses",
+        model: {
+          provider: "openai",
+          api: "openai-responses",
+          baseUrl: "https://api.openai.com/v1",
+          id: "gpt-5.4",
+        } as never,
+        tools: [permissiveTool],
+      }),
+    ).toEqual([
+      {
+        toolName: "cron",
+        toolIndex: 0,
+        violations: expect.arrayContaining([
+          "cron.parameters.required.schedule",
+          "cron.parameters.additionalProperties",
+        ]),
+      },
+    ]);
+  });
+
+  it("skips openai strict-tool normalization on non-native routes", () => {
+    const hooks = buildProviderToolCompatFamilyHooks("openai");
+    const tools = [{ name: "ping", description: "", parameters: {} }] as never;
+
+    expect(
+      hooks.normalizeToolSchemas({
+        provider: "openai",
+        modelId: "gpt-5.4",
+        modelApi: "openai-completions",
+        model: {
+          provider: "openai",
+          api: "openai-completions",
+          baseUrl: "https://example.com/v1",
+          id: "gpt-5.4",
+        } as never,
+        tools,
+      }),
+    ).toBe(tools);
+    expect(
+      hooks.inspectToolSchemas({
+        provider: "openai",
+        modelId: "gpt-5.4",
+        modelApi: "openai-completions",
+        model: {
+          provider: "openai",
+          api: "openai-completions",
+          baseUrl: "https://example.com/v1",
+          id: "gpt-5.4",
+        } as never,
+        tools,
+      }),
+    ).toEqual([]);
+  });
+
+  it("reports remaining strict-schema violations for the openai family", () => {
+    const hooks = buildProviderToolCompatFamilyHooks("openai");
+
+    const diagnostics = hooks.inspectToolSchemas({
+      provider: "openai-codex",
+      modelId: "gpt-5.4",
+      modelApi: "openai-codex-responses",
+      model: {
+        provider: "openai-codex",
+        api: "openai-codex-responses",
+        baseUrl: "https://chatgpt.com/backend-api",
+        id: "gpt-5.4",
+      } as never,
+      tools: [
+        {
+          name: "exec",
+          description: "",
+          parameters: {
+            type: "object",
+            properties: {
+              mode: {
+                anyOf: [{ type: "string" }, { type: "number" }],
+              },
+              cwd: { type: "string" },
+            },
+            required: ["mode"],
+            additionalProperties: true,
+          },
+        } as never,
+      ],
+    });
+
+    expect(diagnostics).toEqual([
+      {
+        toolName: "exec",
+        toolIndex: 0,
+        violations: expect.arrayContaining([
+          "exec.parameters.additionalProperties",
+          "exec.parameters.required.cwd",
+          "exec.parameters.properties.mode.anyOf",
+        ]),
+      },
+    ]);
+  });
+
   it("covers the shared xAI tool compat patch", () => {
     const patch = resolveXaiModelCompatPatch();
 
diff --git a/src/plugin-sdk/provider-tools.ts b/src/plugin-sdk/provider-tools.ts
index ae828a059d3..fec86fca99f 100644
--- a/src/plugin-sdk/provider-tools.ts
+++ b/src/plugin-sdk/provider-tools.ts
@@ -159,7 +159,211 @@ export function inspectGeminiToolSchemas(
   });
 }
 
-export type ProviderToolCompatFamily = "gemini";
+export function normalizeOpenAIToolSchemas(
+  ctx: ProviderNormalizeToolSchemasContext,
+): AnyAgentTool[] {
+  if (!shouldApplyOpenAIToolCompat(ctx)) {
+    return ctx.tools;
+  }
+  return ctx.tools.map((tool) => {
+    if (!tool.parameters || typeof tool.parameters !== "object") {
+      return tool;
+    }
+    return {
+      ...tool,
+      parameters: normalizeOpenAIStrictCompatSchema(tool.parameters),
+    };
+  });
+}
+
+function normalizeOpenAIStrictCompatSchema(schema: unknown): unknown {
+  return normalizeOpenAIStrictCompatSchemaRecursive(schema);
+}
+
+function shouldApplyOpenAIToolCompat(ctx: ProviderNormalizeToolSchemasContext): boolean {
+  const provider = String(ctx.model?.provider ?? ctx.provider ?? "")
+    .trim()
+    .toLowerCase();
+  const api = String(ctx.model?.api ?? ctx.modelApi ?? "")
+    .trim()
+    .toLowerCase();
+  const baseUrl = String(ctx.model?.baseUrl ?? "")
+    .trim()
+    .toLowerCase();
+
+  if (provider === "openai") {
+    return api === "openai-responses" && (!baseUrl || isOpenAIResponsesBaseUrl(baseUrl));
+  }
+  if (provider === "openai-codex") {
+    return (
+      api === "openai-codex-responses" &&
+      (!baseUrl || isOpenAIResponsesBaseUrl(baseUrl) || isOpenAICodexBaseUrl(baseUrl))
+    );
+  }
+  return false;
+}
+
+function isOpenAIResponsesBaseUrl(baseUrl: string): boolean {
+  return /^https:\/\/api\.openai\.com(?:\/v1)?(?:\/|$)/i.test(baseUrl);
+}
+
+function isOpenAICodexBaseUrl(baseUrl: string): boolean {
+  return /^https:\/\/chatgpt\.com\/backend-api(?:\/|$)/i.test(baseUrl);
+}
+
+function normalizeOpenAIStrictCompatSchemaRecursive(schema: unknown): unknown {
+  if (Array.isArray(schema)) {
+    let changed = false;
+    const normalized = schema.map((entry) => {
+      const next = normalizeOpenAIStrictCompatSchemaRecursive(entry);
+      changed ||= next !== entry;
+      return next;
+    });
+    return changed ? normalized : schema;
+  }
+  if (!schema || typeof schema !== "object") {
+    return schema;
+  }
+
+  const record = schema as Record<string, unknown>;
+  let changed = false;
+  const normalized: Record<string, unknown> = {};
+  for (const [key, value] of Object.entries(record)) {
+    const next = normalizeOpenAIStrictCompatSchemaRecursive(value);
+    normalized[key] = next;
+    changed ||= next !== value;
+  }
+
+  if (Object.keys(normalized).length === 0) {
+    return {
+      type: "object",
+      properties: {},
+      required: [],
+      additionalProperties: false,
+    };
+  }
+
+  const hasObjectShapeHints =
+    !("type" in normalized) &&
+    ((normalized.properties &&
+      typeof normalized.properties === "object" &&
+      !Array.isArray(normalized.properties)) ||
+      Array.isArray(normalized.required));
+  if (hasObjectShapeHints) {
+    normalized.type = "object";
+    changed = true;
+  }
+  if (normalized.type === "object" && !("properties" in normalized)) {
+    normalized.properties = {};
+    changed = true;
+  }
+
+  const hasEmptyProperties =
+    normalized.properties &&
+    typeof normalized.properties === "object" &&
+    !Array.isArray(normalized.properties) &&
+    Object.keys(normalized.properties as Record<string, unknown>).length === 0;
+
+  if (normalized.type === "object" && !Array.isArray(normalized.required) && hasEmptyProperties) {
+    normalized.required = [];
+    changed = true;
+  }
+
+  if (
+    normalized.type === "object" &&
+    hasEmptyProperties &&
+    !("additionalProperties" in normalized) &&
+    normalized.additionalProperties !== false
+  ) {
+    normalized.additionalProperties = false;
+    changed = true;
+  }
+
+  return changed ? normalized : schema;
+}
+
+export function findOpenAIStrictSchemaViolations(schema: unknown, path: string): string[] {
+  if (Array.isArray(schema)) {
+    return schema.flatMap((item, index) =>
+      findOpenAIStrictSchemaViolations(item, `${path}[${index}]`),
+    );
+  }
+  if (!schema || typeof schema !== "object") {
+    return [];
+  }
+
+  const record = schema as Record<string, unknown>;
+  const violations: string[] = [];
+  for (const key of ["anyOf", "oneOf", "allOf"] as const) {
+    if (Array.isArray(record[key])) {
+      violations.push(`${path}.${key}`);
+    }
+  }
+  if (Array.isArray(record.type)) {
+    violations.push(`${path}.type`);
+  }
+
+  const properties =
+    record.properties && typeof record.properties === "object" && !Array.isArray(record.properties)
+      ? (record.properties as Record<string, unknown>)
+      : undefined;
+
+  if (record.type === "object") {
+    if (record.additionalProperties !== false) {
+      violations.push(`${path}.additionalProperties`);
+    }
+    const required = Array.isArray(record.required)
+      ? record.required.filter((entry): entry is string => typeof entry === "string")
+      : undefined;
+    if (!required) {
+      violations.push(`${path}.required`);
+    } else if (properties) {
+      const requiredSet = new Set(required);
+      for (const key of Object.keys(properties)) {
+        if (!requiredSet.has(key)) {
+          violations.push(`${path}.required.${key}`);
+        }
+      }
+    }
+  }
+
+  if (properties) {
+    for (const [key, value] of Object.entries(properties)) {
+      violations.push(...findOpenAIStrictSchemaViolations(value, `${path}.properties.${key}`));
+    }
+  }
+
+  for (const [key, value] of Object.entries(record)) {
+    if (key === "properties") {
+      continue;
+    }
+    if (value && typeof value === "object") {
+      violations.push(...findOpenAIStrictSchemaViolations(value, `${path}.${key}`));
+    }
+  }
+
+  return violations;
+}
+
+export function inspectOpenAIToolSchemas(
+  ctx: ProviderNormalizeToolSchemasContext,
+): ProviderToolSchemaDiagnostic[] {
+  if (!shouldApplyOpenAIToolCompat(ctx)) {
+    return [];
+  }
+  return ctx.tools.flatMap((tool, toolIndex) => {
+    const violations = findOpenAIStrictSchemaViolations(
+      normalizeOpenAIStrictCompatSchema(tool.parameters),
+      `${tool.name}.parameters`,
+    );
+    if (violations.length === 0) {
+      return [];
+    }
+    return [{ toolName: tool.name, toolIndex, violations }];
+  });
+}
+
+export type ProviderToolCompatFamily = "gemini" | "openai";
 
 export function buildProviderToolCompatFamilyHooks(family: ProviderToolCompatFamily): {
   normalizeToolSchemas: (ctx: ProviderNormalizeToolSchemasContext) => AnyAgentTool[];
@@ -171,6 +375,11 @@ export function buildProviderToolCompatFamilyHooks(family: ProviderToolCompatFam
         normalizeToolSchemas: normalizeGeminiToolSchemas,
         inspectToolSchemas: inspectGeminiToolSchemas,
       };
+    case "openai":
+      return {
+        normalizeToolSchemas: normalizeOpenAIToolSchemas,
+        inspectToolSchemas: inspectOpenAIToolSchemas,
+      };
   }
   throw new Error("Unsupported provider tool compatibility family");
 }