diff --git a/extensions/discord/src/monitor.tool-result.accepts-guild-messages-mentionpatterns-match.e2e.test.ts b/extensions/discord/src/monitor.tool-result.accepts-guild-messages-mentionpatterns-match.e2e.test.ts
index bc1bcb81b6e..73c411e5407 100644
--- a/extensions/discord/src/monitor.tool-result.accepts-guild-messages-mentionpatterns-match.e2e.test.ts
+++ b/extensions/discord/src/monitor.tool-result.accepts-guild-messages-mentionpatterns-match.e2e.test.ts
@@ -26,7 +26,7 @@ function createOpenGuildConfig(
   channels: Record<string, { allow: boolean; includeThreadStarter?: boolean }>,
   extra: Partial<Config> = {},
 ): Config {
-  return {
+  const cfg: Config = {
     ...createMentionRequiredGuildConfig(),
     ...extra,
     channels: {
@@ -41,7 +41,8 @@ function createOpenGuildConfig(
         },
       },
     },
-  } as Config;
+  };
+  return cfg;
 }
 
 describe("discord tool result dispatch", () => {
diff --git a/extensions/discord/src/monitor.tool-result.sends-status-replies-responseprefix.test.ts b/extensions/discord/src/monitor.tool-result.sends-status-replies-responseprefix.test.ts
index 79cf61da3ab..354ba2a72de 100644
--- a/extensions/discord/src/monitor.tool-result.sends-status-replies-responseprefix.test.ts
+++ b/extensions/discord/src/monitor.tool-result.sends-status-replies-responseprefix.test.ts
@@ -70,12 +70,12 @@ describe("discord tool result dispatch", () => {
   });
 
   it("replies with pairing code and sender id when dmPolicy is pairing", async () => {
-    const cfg = {
+    const cfg: Config = {
       ...BASE_CFG,
       channels: {
         discord: { dm: { enabled: true, policy: "pairing", allowFrom: [] } },
       },
-    } as Config;
+    };
 
     const handler = await createDmHandler({ cfg });
     const client = createDmClient();
diff --git a/extensions/discord/src/monitor.tool-result.test-helpers.ts b/extensions/discord/src/monitor.tool-result.test-helpers.ts
index 930182f0340..67b5637a7b6 100644
--- a/extensions/discord/src/monitor.tool-result.test-helpers.ts
+++ b/extensions/discord/src/monitor.tool-result.test-helpers.ts
@@ -307,7 +307,7 @@ export function createMentionRequiredGuildConfig(overrides?: Partial<Config>): C
       },
     },
     ...overrides,
-  } as Config;
+  };
 }
 
 export function captureNextDispatchCtx<
diff --git a/extensions/discord/src/monitor/native-command.commands-allowfrom.test.ts b/extensions/discord/src/monitor/native-command.commands-allowfrom.test.ts
index bd7e9c9305d..ffb0178b131 100644
--- a/extensions/discord/src/monitor/native-command.commands-allowfrom.test.ts
+++ b/extensions/discord/src/monitor/native-command.commands-allowfrom.test.ts
@@ -274,10 +274,9 @@ describe("Discord native slash commands with commands.allowFrom", () => {
       },
     });
 
-    const dispatchCall = vi.mocked(dispatcherModule.dispatchReplyWithDispatcher).mock
-      .calls[0]?.[0] as
+    const dispatchCall:
       | Parameters<typeof dispatcherModule.dispatchReplyWithDispatcher>[0]
-      | undefined;
+      | undefined = vi.mocked(dispatcherModule.dispatchReplyWithDispatcher).mock.calls[0]?.[0];
     await dispatchCall?.dispatcherOptions.deliver({ text: longReply }, { kind: "final" });
 
     expect(interaction.followUp).toHaveBeenCalledWith(
diff --git a/extensions/discord/src/monitor/native-command.options.test.ts b/extensions/discord/src/monitor/native-command.options.test.ts
index 0dc994263f7..19bf449d8bd 100644
--- a/extensions/discord/src/monitor/native-command.options.test.ts
+++ b/extensions/discord/src/monitor/native-command.options.test.ts
@@ -48,19 +48,18 @@ function createNativeCommand(
     throw new Error(`missing native command: ${name}`);
   }
   const baseCfg: ReturnType<typeof loadConfig> = opts?.cfg ?? {};
-  const discordConfig = (opts?.discordConfig ?? baseCfg.channels?.discord ?? {}) as NonNullable<
-    OpenClawConfig["channels"]
-  >["discord"];
+  const discordConfig: NonNullable<OpenClawConfig["channels"]>["discord"] =
+    opts?.discordConfig ?? baseCfg.channels?.discord ?? {};
   const cfg =
     opts?.discordConfig === undefined
       ? baseCfg
-      : ({
+      : {
           ...baseCfg,
           channels: {
             ...baseCfg.channels,
             discord: discordConfig,
           },
-        } as ReturnType<typeof loadConfig>);
+        };
   return createDiscordNativeCommand({
     command,
     cfg,
diff --git a/extensions/memory-core/src/tools.recall-tracking.test.ts b/extensions/memory-core/src/tools.recall-tracking.test.ts
index f69b8aede6e..6c25c1e36c8 100644
--- a/extensions/memory-core/src/tools.recall-tracking.test.ts
+++ b/extensions/memory-core/src/tools.recall-tracking.test.ts
@@ -25,7 +25,7 @@ vi.mock("./short-term-promotion.js", () => ({
 }));
 
 function asOpenClawConfig(config: Partial<OpenClawConfig>): OpenClawConfig {
-  return config as OpenClawConfig;
+  return config;
 }
 
 function createSearchTool(config: OpenClawConfig) {
diff --git a/extensions/memory-core/src/tools.test-helpers.ts b/extensions/memory-core/src/tools.test-helpers.ts
index cede4ed0cf5..71c72d1a687 100644
--- a/extensions/memory-core/src/tools.test-helpers.ts
+++ b/extensions/memory-core/src/tools.test-helpers.ts
@@ -3,7 +3,7 @@ import type { OpenClawConfig } from "../api.js";
 import { createMemoryGetTool, createMemorySearchTool } from "./tools.js";
 
 export function asOpenClawConfig(config: Partial<OpenClawConfig>): OpenClawConfig {
-  return config as OpenClawConfig;
+  return config;
 }
 
 export function createDefaultMemoryToolConfig(): OpenClawConfig {
diff --git a/extensions/voice-call/index.test.ts b/extensions/voice-call/index.test.ts
index 54a25759b3e..3fc37167dbb 100644
--- a/extensions/voice-call/index.test.ts
+++ b/extensions/voice-call/index.test.ts
@@ -3,6 +3,8 @@ import os from "node:os";
 import path from "node:path";
 import { Command } from "commander";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { createTestPluginApi } from "../../test/helpers/plugins/plugin-api.ts";
+import type { OpenClawPluginApi } from "./api.js";
 
 let runtimeStub: {
   config: { toNumber?: string };
@@ -57,7 +59,7 @@ function captureStdout() {
 function setup(config: Record<string, unknown>): Registered {
   const methods = new Map<string, unknown>();
   const tools: unknown[] = [];
-  void plugin.register({
+  const api = createTestPluginApi({
     id: "voice-call",
     name: "Voice Call",
     description: "test",
@@ -65,16 +67,15 @@ function setup(config: Record<string, unknown>): Registered {
     source: "test",
     config: {},
     pluginConfig: config,
-    runtime: { tts: { textToSpeechTelephony: vi.fn() } } as unknown as Parameters<
-      typeof plugin.register
-    >[0]["runtime"],
+    runtime: { tts: { textToSpeechTelephony: vi.fn() } } as unknown as OpenClawPluginApi["runtime"],
     logger: noopLogger,
     registerGatewayMethod: (method: string, handler: unknown) => methods.set(method, handler),
     registerTool: (tool: unknown) => tools.push(tool),
     registerCli: () => {},
     registerService: () => {},
     resolvePath: (p: string) => p,
-  } as unknown as Parameters<typeof plugin.register>[0]);
+  });
+  void plugin.register(api);
   return { methods, tools };
 }