diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5191ff1a94..75e88ea0956 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Docs: https://docs.openclaw.ai
 
 ### Changes
 
+- TypeScript: enable stricter compiler checks for implicit returns, side-effect imports, overrides, and unused production code.
 - Build: upgrade workspace package management to pnpm 11 and keep Docker, install, update, and release workflows on the pnpm 11 config surface. (#79414) Thanks @altaywtf.
 - Models: add provider-level `localService` startup for on-demand local model servers before OpenAI-compatible requests, including one-shot model probes.
 - Agents: trim default system prompt guidance and send-only message tool schemas to reduce prompt tokens while preserving GPT-5 personality guidance.
diff --git a/docs/.generated/plugin-sdk-api-baseline.sha256 b/docs/.generated/plugin-sdk-api-baseline.sha256
index a886f7e74ad..06672938506 100644
--- a/docs/.generated/plugin-sdk-api-baseline.sha256
+++ b/docs/.generated/plugin-sdk-api-baseline.sha256
@@ -1,2 +1,2 @@
-5219fe6237bdf573740840ef3c29631a8465abb73dd60128fb94589384ae2a96  plugin-sdk-api-baseline.json
-f63c9723859bb900cf636e5e3fc1349a48563e279ca09e01a7ffafad9efe72f8  plugin-sdk-api-baseline.jsonl
+c1d16721a00a26fc578878e508e9a4e2190fe2fadd80534873d0b47ef5e4b513  plugin-sdk-api-baseline.json
+cb008db0486c3ba433bfda844a1c2526bb9729afa21f865e0e86f3ad95ac7cfe  plugin-sdk-api-baseline.jsonl
diff --git a/extensions/codex/src/command-handlers.ts b/extensions/codex/src/command-handlers.ts
index a02576c6562..491a61df9a6 100644
--- a/extensions/codex/src/command-handlers.ts
+++ b/extensions/codex/src/command-handlers.ts
@@ -647,19 +647,12 @@ async function handleCodexDiagnosticsFeedback(
       text: await previewCodexDiagnosticsFeedbackApproval(deps, ctx, parsed.note),
     };
   }
-  return await requestCodexDiagnosticsFeedbackApproval(
-    deps,
-    ctx,
-    pluginConfig,
-    parsed.note,
-    commandPrefix,
-  );
+  return await requestCodexDiagnosticsFeedbackApproval(deps, ctx, parsed.note, commandPrefix);
 }
 
 async function requestCodexDiagnosticsFeedbackApproval(
   deps: CodexCommandDeps,
   ctx: PluginCommandContext,
-  pluginConfig: unknown,
   note: string,
   commandPrefix: string,
 ): Promise<PluginCommandResult> {
diff --git a/extensions/discord/src/approval-handler.runtime.ts b/extensions/discord/src/approval-handler.runtime.ts
index 4ea278664b9..7dd7be134db 100644
--- a/extensions/discord/src/approval-handler.runtime.ts
+++ b/extensions/discord/src/approval-handler.runtime.ts
@@ -111,9 +111,9 @@ class ExecApprovalContainer extends DiscordUiContainer {
 }
 
 class ExecApprovalActionButton extends Button {
-  customId: string;
-  label: string;
-  style: ButtonStyle;
+  override customId: string;
+  override label: string;
+  override style: ButtonStyle;
 
   constructor(params: { approvalId: string; descriptor: ExecApprovalActionDescriptor }) {
     super();
diff --git a/extensions/discord/src/components.builders.ts b/extensions/discord/src/components.builders.ts
index 5369457f0d1..f36fc6c6447 100644
--- a/extensions/discord/src/components.builders.ts
+++ b/extensions/discord/src/components.builders.ts
@@ -77,9 +77,9 @@ function createButtonComponent(params: {
   class DynamicButton extends Button {
     label = params.spec.label;
     customId = customId;
-    style = style;
-    emoji = params.spec.emoji;
-    disabled = params.spec.disabled ?? false;
+    override style = style;
+    override emoji = params.spec.emoji;
+    override disabled = params.spec.disabled ?? false;
   }
   if (internalCustomId) {
     return {
@@ -137,11 +137,11 @@ function createSelectComponent(params: {
     }
     class DynamicStringSelect extends StringSelectMenu {
       customId = customId;
-      options = options;
-      minValues = params.spec.minValues;
-      maxValues = params.spec.maxValues;
-      placeholder = params.spec.placeholder;
-      disabled = false;
+      override options = options;
+      override minValues = params.spec.minValues;
+      override maxValues = params.spec.maxValues;
+      override placeholder = params.spec.placeholder;
+      override disabled = false;
     }
     return {
       component: new DynamicStringSelect(),
@@ -155,10 +155,10 @@ function createSelectComponent(params: {
   if (type === "user") {
     class DynamicUserSelect extends UserSelectMenu {
       customId = customId;
-      minValues = params.spec.minValues;
-      maxValues = params.spec.maxValues;
-      placeholder = params.spec.placeholder;
-      disabled = false;
+      override minValues = params.spec.minValues;
+      override maxValues = params.spec.maxValues;
+      override placeholder = params.spec.placeholder;
+      override disabled = false;
     }
     return {
       component: new DynamicUserSelect(),
@@ -168,10 +168,10 @@ function createSelectComponent(params: {
   if (type === "role") {
     class DynamicRoleSelect extends RoleSelectMenu {
       customId = customId;
-      minValues = params.spec.minValues;
-      maxValues = params.spec.maxValues;
-      placeholder = params.spec.placeholder;
-      disabled = false;
+      override minValues = params.spec.minValues;
+      override maxValues = params.spec.maxValues;
+      override placeholder = params.spec.placeholder;
+      override disabled = false;
     }
     return {
       component: new DynamicRoleSelect(),
@@ -181,10 +181,10 @@ function createSelectComponent(params: {
   if (type === "mentionable") {
     class DynamicMentionableSelect extends MentionableSelectMenu {
       customId = customId;
-      minValues = params.spec.minValues;
-      maxValues = params.spec.maxValues;
-      placeholder = params.spec.placeholder;
-      disabled = false;
+      override minValues = params.spec.minValues;
+      override maxValues = params.spec.maxValues;
+      override placeholder = params.spec.placeholder;
+      override disabled = false;
     }
     return {
       component: new DynamicMentionableSelect(),
@@ -193,10 +193,10 @@ function createSelectComponent(params: {
   }
   class DynamicChannelSelect extends ChannelSelectMenu {
     customId = customId;
-    minValues = params.spec.minValues;
-    maxValues = params.spec.maxValues;
-    placeholder = params.spec.placeholder;
-    disabled = false;
+    override minValues = params.spec.minValues;
+    override maxValues = params.spec.maxValues;
+    override placeholder = params.spec.placeholder;
+    override disabled = false;
   }
   return {
     component: new DynamicChannelSelect(),
diff --git a/extensions/discord/src/components.modal.ts b/extensions/discord/src/components.modal.ts
index 626d07e4714..ed7371ada06 100644
--- a/extensions/discord/src/components.modal.ts
+++ b/extensions/discord/src/components.modal.ts
@@ -26,11 +26,11 @@ function createModalFieldComponent(
   if (field.type === "text") {
     class DynamicTextInput extends TextInput {
       customId = field.id;
-      style = mapTextInputStyle(field.style);
-      placeholder = field.placeholder;
-      required = field.required;
-      minLength = field.minLength;
-      maxLength = field.maxLength;
+      override style = mapTextInputStyle(field.style);
+      override placeholder = field.placeholder;
+      override required = field.required;
+      override minLength = field.minLength;
+      override maxLength = field.maxLength;
     }
     return new DynamicTextInput();
   }
@@ -38,31 +38,31 @@ function createModalFieldComponent(
     const options = field.options ?? [];
     class DynamicModalSelect extends StringSelectMenu {
       customId = field.id;
-      options = options;
-      required = field.required;
-      minValues = field.minValues;
-      maxValues = field.maxValues;
-      placeholder = field.placeholder;
+      override options = options;
+      override required = field.required;
+      override minValues = field.minValues;
+      override maxValues = field.maxValues;
+      override placeholder = field.placeholder;
     }
     return new DynamicModalSelect();
   }
   if (field.type === "role-select") {
     class DynamicModalRoleSelect extends RoleSelectMenu {
       customId = field.id;
-      required = field.required;
-      minValues = field.minValues;
-      maxValues = field.maxValues;
-      placeholder = field.placeholder;
+      override required = field.required;
+      override minValues = field.minValues;
+      override maxValues = field.maxValues;
+      override placeholder = field.placeholder;
     }
     return new DynamicModalRoleSelect();
   }
   if (field.type === "user-select") {
     class DynamicModalUserSelect extends UserSelectMenu {
       customId = field.id;
-      required = field.required;
-      minValues = field.minValues;
-      maxValues = field.maxValues;
-      placeholder = field.placeholder;
+      override required = field.required;
+      override minValues = field.minValues;
+      override maxValues = field.maxValues;
+      override placeholder = field.placeholder;
     }
     return new DynamicModalUserSelect();
   }
@@ -70,29 +70,29 @@ function createModalFieldComponent(
     const options = field.options ?? [];
     class DynamicCheckboxGroup extends CheckboxGroup {
       customId = field.id;
-      options = options;
-      required = field.required;
-      minValues = field.minValues;
-      maxValues = field.maxValues;
+      override options = options;
+      override required = field.required;
+      override minValues = field.minValues;
+      override maxValues = field.maxValues;
     }
     return new DynamicCheckboxGroup();
   }
   const options = field.options ?? [];
   class DynamicRadioGroup extends RadioGroup {
     customId = field.id;
-    options = options;
-    required = field.required;
-    minValues = field.minValues;
-    maxValues = field.maxValues;
+    override options = options;
+    override required = field.required;
+    override minValues = field.minValues;
+    override maxValues = field.maxValues;
   }
   return new DynamicRadioGroup();
 }
 
 export class DiscordFormModal extends ModalBase {
-  title: string;
-  customId: string;
-  components: Array<Label | TextDisplay>;
-  customIdParser = parseDiscordModalCustomIdForInteractionImpl;
+  override title: string;
+  override customId: string;
+  override components: Array<Label | TextDisplay>;
+  override customIdParser = parseDiscordModalCustomIdForInteractionImpl;
 
   constructor(params: { modalId: string; title: string; fields: DiscordModalFieldDefinition[] }) {
     super();
@@ -101,10 +101,10 @@ export class DiscordFormModal extends ModalBase {
     this.components = params.fields.map((field) => {
       const component = createModalFieldComponent(field);
       class DynamicLabel extends Label {
-        label = field.label;
-        description = field.description;
-        component = component;
-        customId = field.id;
+        override label = field.label;
+        override description = field.description;
+        override component = component;
+        override customId = field.id;
       }
       return new DynamicLabel(component);
     });
diff --git a/extensions/discord/src/internal/client.test.ts b/extensions/discord/src/internal/client.test.ts
index ee45998777c..3a6fd72d7d5 100644
--- a/extensions/discord/src/internal/client.test.ts
+++ b/extensions/discord/src/internal/client.test.ts
@@ -34,9 +34,9 @@ function createTestCommand(params: {
 }): BaseCommand {
   return new (class extends BaseCommand {
     name = params.name;
-    description = `${params.name} command`;
+    override description = `${params.name} command`;
     type = ApplicationCommandType.ChatInput;
-    guildIds = params.guildIds;
+    override guildIds = params.guildIds;
     serializeOptions() {
       return params.options;
     }
@@ -57,7 +57,7 @@ describe("ComponentRegistry", () => {
     class WildcardButton extends Button {
       label = "button";
       customId = "__button_wildcard__";
-      customIdParser = (id: string) =>
+      override customIdParser = (id: string) =>
         id === this.customId || id.startsWith("occomp:")
           ? { key: "*", data: {} }
           : parseCustomId(id);
@@ -65,7 +65,7 @@ describe("ComponentRegistry", () => {
     class WildcardSelect extends StringSelectMenu {
       customId = "__select_wildcard__";
       options = [];
-      customIdParser = (id: string) =>
+      override customIdParser = (id: string) =>
         id === this.customId || id.startsWith("occomp:")
           ? { key: "*", data: {} }
           : parseCustomId(id);
@@ -89,7 +89,7 @@ describe("ComponentRegistry", () => {
     class EncodedButton extends Button {
       label = "button";
       customId = "encoded:seed=one";
-      customIdParser = (id: string) => ({
+      override customIdParser = (id: string) => ({
         key: id.startsWith("encoded:") ? "encoded" : parseCustomId(id).key,
         data: {},
       });
diff --git a/extensions/discord/src/internal/components.base.ts b/extensions/discord/src/internal/components.base.ts
index 59ccfcd0dd6..f4e6b65108e 100644
--- a/extensions/discord/src/internal/components.base.ts
+++ b/extensions/discord/src/internal/components.base.ts
@@ -50,7 +50,7 @@ export abstract class BaseComponent {
 }
 
 export abstract class BaseMessageInteractiveComponent extends BaseComponent {
-  readonly isV2 = false;
+  override readonly isV2 = false;
   defer: boolean | ConditionalComponentOption = false;
   ephemeral: boolean | ConditionalComponentOption = false;
   abstract customId: string;
diff --git a/extensions/discord/src/internal/components.message.ts b/extensions/discord/src/internal/components.message.ts
index df54ac9735d..babd7c2b5de 100644
--- a/extensions/discord/src/internal/components.message.ts
+++ b/extensions/discord/src/internal/components.message.ts
@@ -45,8 +45,8 @@ export abstract class Button extends BaseButton {
 export abstract class LinkButton extends BaseButton {
   customId = "";
   abstract url: string;
-  style = ButtonStyle.Link;
-  async run(): Promise<never> {
+  override style = ButtonStyle.Link;
+  override async run(): Promise<never> {
     throw new Error("Link buttons do not run handlers");
   }
   serialize(): APIButtonComponent {
@@ -128,7 +128,7 @@ export abstract class ChannelSelectMenu extends AnySelectMenu {
 
 export class Row<T extends BaseMessageInteractiveComponent> extends BaseComponent {
   readonly type = ComponentType.ActionRow;
-  readonly isV2 = false;
+  override readonly isV2 = false;
   components: T[];
   constructor(components: T[] = []) {
     super();
@@ -155,7 +155,7 @@ export class Row<T extends BaseMessageInteractiveComponent> extends BaseComponen
 
 export class TextDisplay extends BaseComponent {
   readonly type = ComponentType.TextDisplay;
-  readonly isV2 = true;
+  override readonly isV2 = true;
   constructor(public content?: string) {
     super();
   }
@@ -166,7 +166,7 @@ export class TextDisplay extends BaseComponent {
 
 export class Separator extends BaseComponent {
   readonly type = ComponentType.Separator;
-  readonly isV2 = true;
+  override readonly isV2 = true;
   divider = true;
   spacing: 1 | 2 | "small" | "large" = "small";
   constructor(options?: { spacing?: Separator["spacing"]; divider?: boolean }) {
@@ -185,7 +185,7 @@ export class Separator extends BaseComponent {
 
 export class Thumbnail extends BaseComponent {
   readonly type = ComponentType.Thumbnail;
-  readonly isV2 = true;
+  override readonly isV2 = true;
   constructor(public url?: string) {
     super();
   }
@@ -199,7 +199,7 @@ export class Thumbnail extends BaseComponent {
 
 export class Section extends BaseComponent {
   readonly type = ComponentType.Section;
-  readonly isV2 = true;
+  override readonly isV2 = true;
   constructor(
     public components: TextDisplay[] = [],
     public accessory?: Thumbnail | Button | LinkButton,
@@ -217,7 +217,7 @@ export class Section extends BaseComponent {
 
 export class MediaGallery extends BaseComponent {
   readonly type = ComponentType.MediaGallery;
-  readonly isV2 = true;
+  override readonly isV2 = true;
   constructor(public items: Array<{ url: string; description?: string; spoiler?: boolean }> = []) {
     super();
   }
@@ -235,7 +235,7 @@ export class MediaGallery extends BaseComponent {
 
 export class File extends BaseComponent {
   readonly type = ComponentType.File;
-  readonly isV2 = true;
+  override readonly isV2 = true;
   constructor(
     public file?: `attachment://${string}`,
     public spoiler = false,
@@ -253,7 +253,7 @@ export class File extends BaseComponent {
 
 export class Container extends BaseComponent {
   readonly type = ComponentType.Container;
-  readonly isV2 = true;
+  override readonly isV2 = true;
   components: Array<
     Row<BaseMessageInteractiveComponent> | TextDisplay | Section | MediaGallery | Separator | File
   >;
diff --git a/extensions/discord/src/internal/gateway.test.ts b/extensions/discord/src/internal/gateway.test.ts
index a1847fade3d..87848c8abd5 100644
--- a/extensions/discord/src/internal/gateway.test.ts
+++ b/extensions/discord/src/internal/gateway.test.ts
@@ -53,12 +53,12 @@ class TestGatewayPlugin extends GatewayPlugin {
   sockets: FakeSocket[] = [];
   connectCalls: boolean[] = [];
 
-  connect(resume = false): void {
+  override connect(resume = false): void {
     this.connectCalls.push(resume);
     super.connect(resume);
   }
 
-  protected createWebSocket(): never {
+  protected override createWebSocket(): never {
     const socket = new FakeSocket();
     this.sockets.push(socket);
     return socket as never;
diff --git a/extensions/discord/src/internal/gateway.ts b/extensions/discord/src/internal/gateway.ts
index 764ddea219f..666a00e2d63 100644
--- a/extensions/discord/src/internal/gateway.ts
+++ b/extensions/discord/src/internal/gateway.ts
@@ -127,7 +127,7 @@ export class GatewayPlugin extends Plugin {
     this.heartbeatTimers.firstHeartbeatTimeout = timer;
   }
 
-  async registerClient(client: Client): Promise<void> {
+  override async registerClient(client: Client): Promise<void> {
     this.client = client;
     if (this.options.shard) {
       client.shardId = this.options.shard[0];
diff --git a/extensions/discord/src/internal/interaction-dispatch.test.ts b/extensions/discord/src/internal/interaction-dispatch.test.ts
index c34db073df0..51562dbdcdc 100644
--- a/extensions/discord/src/internal/interaction-dispatch.test.ts
+++ b/extensions/discord/src/internal/interaction-dispatch.test.ts
@@ -18,10 +18,10 @@ describe("dispatchInteraction", () => {
       await interaction.reply("done");
     });
     class DeferredCommand extends Command {
-      name = "deferred";
-      description = "Deferred command";
-      defer = true;
-      ephemeral = true;
+      override name = "deferred";
+      override description = "Deferred command";
+      override defer = true;
+      override ephemeral = true;
       run = run;
     }
     const client = createInternalTestClient([new DeferredCommand()]);
@@ -54,9 +54,9 @@ describe("dispatchInteraction", () => {
       await interaction.respond([{ name: "alpha", value: "alpha" }]);
     });
     class OptionAutocompleteCommand extends Command {
-      name = "choose";
-      description = "Choose";
-      options = [
+      override name = "choose";
+      override description = "Choose";
+      override options = [
         {
           name: "model",
           description: "Model",
@@ -105,15 +105,15 @@ describe("dispatchInteraction", () => {
       await interaction.reply("joined");
     });
     class JoinCommand extends Command {
-      name = "join";
-      description = "Join";
-      defer = true;
-      ephemeral = true;
+      override name = "join";
+      override description = "Join";
+      override defer = true;
+      override ephemeral = true;
       run = run;
     }
     class VoiceCommand extends CommandWithSubcommands {
-      name = "vc";
-      description = "Voice";
+      override name = "vc";
+      override description = "Voice";
       subcommands = [new JoinCommand()];
     }
     const client = createInternalTestClient([new VoiceCommand()]);
diff --git a/extensions/discord/src/internal/interactions.ts b/extensions/discord/src/internal/interactions.ts
index 22c74080f33..17212215829 100644
--- a/extensions/discord/src/internal/interactions.ts
+++ b/extensions/discord/src/internal/interactions.ts
@@ -286,7 +286,7 @@ export class BaseComponentInteraction extends BaseInteraction {
   async update(payload: MessagePayload): Promise<unknown> {
     return await this.callback(InteractionResponseType.UpdateMessage, serializePayload(payload));
   }
-  async acknowledge(): Promise<unknown> {
+  override async acknowledge(): Promise<unknown> {
     return await this.callback(InteractionResponseType.DeferredMessageUpdate);
   }
   async showModal(modal: Modal): Promise<unknown> {
@@ -323,7 +323,7 @@ export class ModalInteraction extends BaseInteraction {
       client,
     );
   }
-  async acknowledge(): Promise<unknown> {
+  override async acknowledge(): Promise<unknown> {
     return await this.callback(InteractionResponseType.DeferredMessageUpdate);
   }
 }
diff --git a/extensions/discord/src/internal/structures.ts b/extensions/discord/src/internal/structures.ts
index ac277147778..2b236af878c 100644
--- a/extensions/discord/src/internal/structures.ts
+++ b/extensions/discord/src/internal/structures.ts
@@ -67,7 +67,7 @@ export class User<IsPartial extends boolean = false> extends Base {
   get avatarUrl() {
     return this.avatar ? `https://cdn.discordapp.com/avatars/${this.id}/${this.avatar}.png` : null;
   }
-  toString(): string {
+  override toString(): string {
     return `<@${this.id}>`;
   }
   async fetch(): Promise<User> {
diff --git a/extensions/discord/src/internal/voice.ts b/extensions/discord/src/internal/voice.ts
index 6624a9f23e1..02c32691654 100644
--- a/extensions/discord/src/internal/voice.ts
+++ b/extensions/discord/src/internal/voice.ts
@@ -12,7 +12,7 @@ export class VoicePlugin extends Plugin {
   readonly adapters = new Map<string, DiscordGatewayAdapterLibraryMethods>();
   private gatewayPlugin?: GatewayPlugin;
 
-  registerClient(client: Client): void {
+  override registerClient(client: Client): void {
     this.client = client;
     this.gatewayPlugin = client.getPlugin<GatewayPlugin>("gateway");
     if (!this.gatewayPlugin) {
diff --git a/extensions/discord/src/monitor/agent-components.modal.ts b/extensions/discord/src/monitor/agent-components.modal.ts
index 0e2e571e16a..9ee67551d93 100644
--- a/extensions/discord/src/monitor/agent-components.modal.ts
+++ b/extensions/discord/src/monitor/agent-components.modal.ts
@@ -15,10 +15,10 @@ import { dispatchDiscordComponentEvent } from "./agent-components.dispatch.js";
 import { dispatchPluginDiscordInteractiveEvent } from "./agent-components.plugin-interactive.js";
 
 export class DiscordComponentModal extends Modal {
-  title = "OpenClaw form";
-  customId = "__openclaw_discord_component_modal_wildcard__";
-  components = [];
-  customIdParser = parseDiscordModalCustomIdForInteraction;
+  override title = "OpenClaw form";
+  override customId = "__openclaw_discord_component_modal_wildcard__";
+  override components = [];
+  override customIdParser = parseDiscordModalCustomIdForInteraction;
   private ctx: AgentComponentContext;
 
   constructor(ctx: AgentComponentContext) {
diff --git a/extensions/discord/src/monitor/agent-components.system-controls.ts b/extensions/discord/src/monitor/agent-components.system-controls.ts
index 6d5af58fb71..9657675f411 100644
--- a/extensions/discord/src/monitor/agent-components.system-controls.ts
+++ b/extensions/discord/src/monitor/agent-components.system-controls.ts
@@ -21,9 +21,9 @@ import {
 import { enqueueSystemEvent } from "./agent-components.deps.runtime.js";
 
 export class AgentComponentButton extends Button {
-  label = AGENT_BUTTON_KEY;
+  override label = AGENT_BUTTON_KEY;
   customId = `${AGENT_BUTTON_KEY}:seed=1`;
-  style = ButtonStyle.Primary;
+  override style = ButtonStyle.Primary;
   private ctx: AgentComponentContext;
 
   constructor(ctx: AgentComponentContext) {
@@ -31,7 +31,7 @@ export class AgentComponentButton extends Button {
     this.ctx = ctx;
   }
 
-  async run(interaction: ButtonInteraction, data: ComponentData): Promise<void> {
+  override async run(interaction: ButtonInteraction, data: ComponentData): Promise<void> {
     const parsed = parseAgentComponentData(data);
     if (!parsed) {
       logError("agent button: failed to parse component data");
@@ -121,7 +121,7 @@ export class AgentSelectMenu extends StringSelectMenu {
     this.ctx = ctx;
   }
 
-  async run(interaction: StringSelectMenuInteraction, data: ComponentData): Promise<void> {
+  override async run(interaction: StringSelectMenuInteraction, data: ComponentData): Promise<void> {
     const parsed = parseAgentComponentData(data);
     if (!parsed) {
       logError("agent select: failed to parse component data");
diff --git a/extensions/discord/src/monitor/agent-components.wildcard-controls.ts b/extensions/discord/src/monitor/agent-components.wildcard-controls.ts
index 94738d50ee0..ac450d72499 100644
--- a/extensions/discord/src/monitor/agent-components.wildcard-controls.ts
+++ b/extensions/discord/src/monitor/agent-components.wildcard-controls.ts
@@ -71,7 +71,7 @@ const SELECT_CONTROLS = {
 } satisfies Record<string, SelectControlSpec>;
 
 class DiscordComponentSelectControl extends BaseMessageInteractiveComponent {
-  customIdParser = parseDiscordComponentCustomIdForInteraction;
+  override customIdParser = parseDiscordComponentCustomIdForInteraction;
   readonly type: ComponentType;
   readonly customId: string;
 
@@ -91,7 +91,10 @@ class DiscordComponentSelectControl extends BaseMessageInteractiveComponent {
       : { type: this.type, custom_id: this.customId };
   }
 
-  async run(interaction: AgentComponentMessageInteraction, data: ComponentData): Promise<void> {
+  override async run(
+    interaction: AgentComponentMessageInteraction,
+    data: ComponentData,
+  ): Promise<void> {
     await this.handlers.handleComponentEvent({
       ctx: this.ctx,
       interaction,
@@ -104,10 +107,10 @@ class DiscordComponentSelectControl extends BaseMessageInteractiveComponent {
 }
 
 class DiscordComponentButton extends Button {
-  label = "component";
-  customId = "__openclaw_discord_component_button_wildcard__";
-  style = ButtonStyle.Primary;
-  customIdParser = parseDiscordComponentCustomIdForInteraction;
+  override label = "component";
+  override customId = "__openclaw_discord_component_button_wildcard__";
+  override style = ButtonStyle.Primary;
+  override customIdParser = parseDiscordComponentCustomIdForInteraction;
 
   constructor(
     private ctx: AgentComponentContext,
@@ -116,7 +119,7 @@ class DiscordComponentButton extends Button {
     super();
   }
 
-  async run(interaction: ButtonInteraction, data: ComponentData): Promise<void> {
+  override async run(interaction: ButtonInteraction, data: ComponentData): Promise<void> {
     const parsed = parseDiscordComponentData(data, resolveInteractionCustomId(interaction));
     if (parsed?.modalId) {
       await this.handlers.handleModalTrigger({
diff --git a/extensions/discord/src/monitor/exec-approvals.ts b/extensions/discord/src/monitor/exec-approvals.ts
index bdd65b86f1b..224c17db92d 100644
--- a/extensions/discord/src/monitor/exec-approvals.ts
+++ b/extensions/discord/src/monitor/exec-approvals.ts
@@ -68,15 +68,15 @@ function isStructuredApprovalNotFoundError(err: unknown): boolean {
 }
 
 export class ExecApprovalButton extends Button {
-  label = "execapproval";
+  override label = "execapproval";
   customId = "execapproval:seed=1";
-  style = ButtonStyle.Primary;
+  override style = ButtonStyle.Primary;
 
   constructor(private readonly ctx: ExecApprovalButtonContext) {
     super();
   }
 
-  async run(interaction: ButtonInteraction, data: ComponentData): Promise<void> {
+  override async run(interaction: ButtonInteraction, data: ComponentData): Promise<void> {
     const parsed = parseExecApprovalData(data);
     if (!parsed) {
       try {
diff --git a/extensions/discord/src/monitor/model-picker.view.ts b/extensions/discord/src/monitor/model-picker.view.ts
index 5898bfee47c..b242ce4fc92 100644
--- a/extensions/discord/src/monitor/model-picker.view.ts
+++ b/extensions/discord/src/monitor/model-picker.view.ts
@@ -143,8 +143,8 @@ function createModelPickerButton(params: DiscordModelPickerButtonOptions): Butto
   class DiscordModelPickerButton extends Button {
     label = params.label;
     customId = params.customId;
-    style = params.style ?? ButtonStyle.Secondary;
-    disabled = params.disabled ?? false;
+    override style = params.style ?? ButtonStyle.Secondary;
+    override disabled = params.disabled ?? false;
   }
   return new DiscordModelPickerButton();
 }
@@ -157,11 +157,11 @@ function createModelSelect(params: {
 }): StringSelectMenu {
   class DiscordModelPickerSelect extends StringSelectMenu {
     customId = params.customId;
-    options = params.options;
-    minValues = 1;
-    maxValues = 1;
-    placeholder = params.placeholder;
-    disabled = params.disabled ?? false;
+    override options = params.options;
+    override minValues = 1;
+    override maxValues = 1;
+    override placeholder = params.placeholder;
+    override disabled = params.disabled ?? false;
   }
   return new DiscordModelPickerSelect();
 }
diff --git a/extensions/discord/src/monitor/native-command-arg-ui.ts b/extensions/discord/src/monitor/native-command-arg-ui.ts
index 8293754cc8d..85bb85950c3 100644
--- a/extensions/discord/src/monitor/native-command-arg-ui.ts
+++ b/extensions/discord/src/monitor/native-command-arg-ui.ts
@@ -155,7 +155,7 @@ async function runDiscordCommandArgButton(
 class DiscordCommandArgButton extends Button {
   label: string;
   customId: string;
-  style = ButtonStyle.Secondary;
+  override style = ButtonStyle.Secondary;
 
   constructor(
     params: {
@@ -171,7 +171,7 @@ class DiscordCommandArgButton extends Button {
 
   private params: DiscordCommandArgButtonParams;
 
-  async run(interaction: ButtonInteraction, data: ComponentData) {
+  override async run(interaction: ButtonInteraction, data: ComponentData) {
     await runDiscordCommandArgButton({ ...this.params, interaction, data });
   }
 }
@@ -221,7 +221,7 @@ class DiscordCommandArgFallbackButton extends Button {
     super();
   }
 
-  async run(interaction: ButtonInteraction, data: ComponentData) {
+  override async run(interaction: ButtonInteraction, data: ComponentData) {
     await runDiscordCommandArgButton({ ...this.params, interaction, data });
   }
 }
diff --git a/extensions/discord/src/monitor/native-command-model-picker-interaction.ts b/extensions/discord/src/monitor/native-command-model-picker-interaction.ts
index ea9095ba2c5..e558965fd48 100644
--- a/extensions/discord/src/monitor/native-command-model-picker-interaction.ts
+++ b/extensions/discord/src/monitor/native-command-model-picker-interaction.ts
@@ -443,7 +443,7 @@ class DiscordModelPickerFallbackButton extends Button {
     super();
   }
 
-  async run(interaction: ButtonInteraction, data: ComponentData) {
+  override async run(interaction: ButtonInteraction, data: ComponentData) {
     await runDiscordModelPickerFallback({ ...this.params, interaction, data });
   }
 }
@@ -456,7 +456,7 @@ class DiscordModelPickerFallbackSelect extends StringSelectMenu {
     super();
   }
 
-  async run(interaction: StringSelectMenuInteraction, data: ComponentData) {
+  override async run(interaction: StringSelectMenuInteraction, data: ComponentData) {
     await runDiscordModelPickerFallback({ ...this.params, interaction, data });
   }
 }
diff --git a/extensions/discord/src/monitor/native-command.ts b/extensions/discord/src/monitor/native-command.ts
index 1b859a5365c..8ae0d7f9b79 100644
--- a/extensions/discord/src/monitor/native-command.ts
+++ b/extensions/discord/src/monitor/native-command.ts
@@ -174,18 +174,18 @@ export function createDiscordNativeCommand(params: {
       : undefined;
 
   return new (class extends Command {
-    name = command.name;
-    description = truncateDiscordCommandDescription({
+    override name = command.name;
+    override description = truncateDiscordCommandDescription({
       value: command.description,
       label: `command:${command.name}`,
     });
-    descriptionLocalizations = truncateDiscordCommandDescriptionLocalizations({
+    override descriptionLocalizations = truncateDiscordCommandDescriptionLocalizations({
       value: command.descriptionLocalizations,
       label: `command:${command.name}`,
     });
-    defer = false;
-    ephemeral = ephemeralDefault;
-    options = options;
+    override defer = false;
+    override ephemeral = ephemeralDefault;
+    override options = options;
 
     async run(interaction: CommandInteraction) {
       const deferred = await safeDiscordInteractionCall("interaction defer", () =>
diff --git a/extensions/discord/src/voice/command.ts b/extensions/discord/src/voice/command.ts
index a54d638b51d..e77963d4dc5 100644
--- a/extensions/discord/src/voice/command.ts
+++ b/extensions/discord/src/voice/command.ts
@@ -152,11 +152,11 @@ export function createDiscordVoiceCommand(params: VoiceCommandContext): CommandW
     manager.status().find((entry) => entry.guildId === guildId)?.channelId;
 
   class JoinCommand extends Command {
-    name = "join";
-    description = "Join a voice channel";
-    defer = true;
-    ephemeral = params.ephemeralDefault;
-    options: CommandOptions = [
+    override name = "join";
+    override description = "Join a voice channel";
+    override defer = true;
+    override ephemeral = params.ephemeralDefault;
+    override options: CommandOptions = [
       {
         name: "channel",
         description: "Voice channel to join",
@@ -211,10 +211,10 @@ export function createDiscordVoiceCommand(params: VoiceCommandContext): CommandW
   }
 
   class LeaveCommand extends Command {
-    name = "leave";
-    description = "Leave the current voice channel";
-    defer = true;
-    ephemeral = params.ephemeralDefault;
+    override name = "leave";
+    override description = "Leave the current voice channel";
+    override defer = true;
+    override ephemeral = params.ephemeralDefault;
 
     async run(interaction: CommandInteraction) {
       const runtimeContext = await resolveVoiceCommandRuntimeContext(interaction, params);
@@ -239,10 +239,10 @@ export function createDiscordVoiceCommand(params: VoiceCommandContext): CommandW
   }
 
   class StatusCommand extends Command {
-    name = "status";
-    description = "Show active voice sessions";
-    defer = true;
-    ephemeral = params.ephemeralDefault;
+    override name = "status";
+    override description = "Show active voice sessions";
+    override defer = true;
+    override ephemeral = params.ephemeralDefault;
 
     async run(interaction: CommandInteraction) {
       const runtimeContext = await resolveVoiceCommandRuntimeContext(interaction, params);
@@ -273,8 +273,8 @@ export function createDiscordVoiceCommand(params: VoiceCommandContext): CommandW
   }
 
   return new (class extends CommandWithSubcommands {
-    name = "vc";
-    description = "Voice channel controls";
+    override name = "vc";
+    override description = "Voice channel controls";
     subcommands = [new JoinCommand(), new LeaveCommand(), new StatusCommand()];
   })();
 }
diff --git a/extensions/feishu/src/docx.ts b/extensions/feishu/src/docx.ts
index 92067d7528c..0056b88c138 100644
--- a/extensions/feishu/src/docx.ts
+++ b/extensions/feishu/src/docx.ts
@@ -121,7 +121,6 @@ function cleanBlocksForInsert(blocks: FeishuDocxBlock[]): {
 // ============ Core Functions ============
 
 /** Max blocks per documentBlockChildren.create request */
-const MAX_BLOCKS_PER_INSERT = 50;
 const MAX_CONVERT_RETRY_DEPTH = 8;
 
 async function convertMarkdown(client: Lark.Client, markdown: string) {
@@ -416,26 +415,6 @@ async function chunkedConvertMarkdown(client: Lark.Client, markdown: string) {
   return { blocks: allBlocks, firstLevelBlockIds: allRootIds };
 }
 
-/** Insert blocks in batches of MAX_BLOCKS_PER_INSERT to avoid API 400 errors */
-async function _chunkedInsertBlocks(
-  client: Lark.Client,
-  docToken: string,
-  blocks: FeishuDocxBlock[],
-  parentBlockId?: string,
-): Promise<{ children: FeishuDocxBlockChild[]; skipped: string[] }> {
-  const allChildren: FeishuDocxBlockChild[] = [];
-  const allSkipped: string[] = [];
-
-  for (let i = 0; i < blocks.length; i += MAX_BLOCKS_PER_INSERT) {
-    const batch = blocks.slice(i, i + MAX_BLOCKS_PER_INSERT);
-    const { children, skipped } = await insertBlocks(client, docToken, batch, parentBlockId);
-    allChildren.push(...children);
-    allSkipped.push(...skipped);
-  }
-
-  return { children: allChildren, skipped: allSkipped };
-}
-
 type Logger = { info?: (msg: string) => void };
 
 /**
diff --git a/extensions/github-copilot/stream.ts b/extensions/github-copilot/stream.ts
index 7e2a5ce21c9..1185f1ea473 100644
--- a/extensions/github-copilot/stream.ts
+++ b/extensions/github-copilot/stream.ts
@@ -8,7 +8,6 @@ import {
 } from "openclaw/plugin-sdk/provider-stream-shared";
 import { rewriteCopilotResponsePayloadConnectionBoundIds } from "./connection-bound-ids.js";
 
-type _StreamContext = Parameters<StreamFn>[1];
 type StreamOptions = Parameters<StreamFn>[2];
 
 function containsCopilotContentType(value: unknown, type: string): boolean {
diff --git a/extensions/googlechat/src/monitor-access.ts b/extensions/googlechat/src/monitor-access.ts
index d69757fdafe..d9ac3e1da01 100644
--- a/extensions/googlechat/src/monitor-access.ts
+++ b/extensions/googlechat/src/monitor-access.ts
@@ -30,9 +30,6 @@ function normalizeUserId(raw?: string | null): string {
   return normalizeLowercaseStringOrEmpty(trimmed.replace(/^users\//i, ""));
 }
 
-type GoogleChatDmPolicy = "open" | "pairing" | "allowlist" | "disabled";
-type GoogleChatGroupPolicy = "open" | "allowlist" | "disabled";
-
 const GOOGLECHAT_EMAIL_KIND = "plugin:googlechat-email" as const;
 
 function normalizeEntryValue(raw?: string | null): string {
diff --git a/extensions/matrix/src/matrix/actions/pins.ts b/extensions/matrix/src/matrix/actions/pins.ts
index bcc3a2b287e..6ab1f63e281 100644
--- a/extensions/matrix/src/matrix/actions/pins.ts
+++ b/extensions/matrix/src/matrix/actions/pins.ts
@@ -9,7 +9,6 @@ import {
 
 async function updateMatrixPins(
   roomId: string,
-  messageId: string,
   opts: MatrixActionClientOpts,
   update: (current: string[]) => string[],
 ): Promise<{ pinned: string[] }> {
@@ -27,7 +26,7 @@ export async function pinMatrixMessage(
   messageId: string,
   opts: MatrixActionClientOpts = {},
 ): Promise<{ pinned: string[] }> {
-  return await updateMatrixPins(roomId, messageId, opts, (current) =>
+  return await updateMatrixPins(roomId, opts, (current) =>
     current.includes(messageId) ? current : [...current, messageId],
   );
 }
@@ -37,7 +36,7 @@ export async function unpinMatrixMessage(
   messageId: string,
   opts: MatrixActionClientOpts = {},
 ): Promise<{ pinned: string[] }> {
-  return await updateMatrixPins(roomId, messageId, opts, (current) =>
+  return await updateMatrixPins(roomId, opts, (current) =>
     current.filter((id) => id !== messageId),
   );
 }
diff --git a/extensions/matrix/src/matrix/sdk/verification-manager.ts b/extensions/matrix/src/matrix/sdk/verification-manager.ts
index cfdd9bc7f63..bfd658419d5 100644
--- a/extensions/matrix/src/matrix/sdk/verification-manager.ts
+++ b/extensions/matrix/src/matrix/sdk/verification-manager.ts
@@ -161,7 +161,7 @@ export class MatrixVerificationManager {
   ) {}
 
   private readRequestValue<T>(
-    request: MatrixVerificationRequestLike,
+    _request: MatrixVerificationRequestLike,
     reader: () => T,
     fallback: T,
   ): T {
diff --git a/extensions/matrix/src/matrix/thread-bindings.ts b/extensions/matrix/src/matrix/thread-bindings.ts
index 847bb0e53cf..19261d36f88 100644
--- a/extensions/matrix/src/matrix/thread-bindings.ts
+++ b/extensions/matrix/src/matrix/thread-bindings.ts
@@ -41,13 +41,6 @@ type StoredMatrixThreadBindingState = {
   bindings: MatrixThreadBindingRecord[];
 };
 
-function _normalizeDurationMs(raw: unknown, fallback: number): number {
-  if (typeof raw !== "number" || !Number.isFinite(raw)) {
-    return fallback;
-  }
-  return Math.max(0, Math.floor(raw));
-}
-
 function resolveBindingsPath(params: {
   auth: MatrixAuth;
   accountId: string;
diff --git a/extensions/memory-core/src/memory/manager.ts b/extensions/memory-core/src/memory/manager.ts
index a92e9d280d0..42385695c1a 100644
--- a/extensions/memory-core/src/memory/manager.ts
+++ b/extensions/memory-core/src/memory/manager.ts
@@ -51,8 +51,6 @@ import {
 } from "./manager-status-state.js";
 import {
   enqueueMemoryTargetedSessionSync,
-  extractMemoryErrorReason,
-  isMemoryReadonlyDbError,
   runMemorySyncWithReadonlyRecovery,
   type MemoryReadonlyRecoveryState,
 } from "./manager-sync-control.js";
@@ -94,14 +92,14 @@ export class MemoryIndexManager extends MemoryManagerEmbeddingOps implements Mem
   protected readonly agentId: string;
   protected readonly workspaceDir: string;
   protected readonly settings: ResolvedMemorySearchConfig;
-  protected provider: EmbeddingProvider | null;
+  protected override provider: EmbeddingProvider | null;
   private readonly requestedProvider: EmbeddingProviderRequest;
   private providerInitPromise: Promise<void> | null = null;
   private providerInitialized = false;
-  protected fallbackFrom?: EmbeddingProviderId;
-  protected fallbackReason?: string;
+  protected override fallbackFrom?: EmbeddingProviderId;
+  protected override fallbackReason?: string;
   private providerUnavailableReason?: string;
-  protected providerRuntime?: EmbeddingProviderRuntime;
+  protected override providerRuntime?: EmbeddingProviderRuntime;
   protected batch: {
     enabled: boolean;
     wait: boolean;
@@ -114,8 +112,8 @@ export class MemoryIndexManager extends MemoryManagerEmbeddingOps implements Mem
   protected batchFailureLastProvider?: string;
   protected batchFailureLock: Promise<void> = Promise.resolve();
   protected db: DatabaseSync;
-  protected readonly sources: Set<MemorySource>;
-  protected providerKey: string;
+  protected override readonly sources: Set<MemorySource>;
+  protected override providerKey: string;
   protected readonly cache: { enabled: boolean; maxEntries?: number };
   protected readonly vector: {
     enabled: boolean;
@@ -125,23 +123,23 @@ export class MemoryIndexManager extends MemoryManagerEmbeddingOps implements Mem
     loadError?: string;
     dims?: number;
   };
-  protected readonly fts: {
+  protected override readonly fts: {
     enabled: boolean;
     available: boolean;
     loadError?: string;
   };
-  protected vectorReady: Promise<boolean> | null = null;
-  protected watcher: FSWatcher | null = null;
-  protected watchTimer: NodeJS.Timeout | null = null;
-  protected sessionWatchTimer: NodeJS.Timeout | null = null;
-  protected sessionUnsubscribe: (() => void) | null = null;
-  protected intervalTimer: NodeJS.Timeout | null = null;
-  protected closed = false;
-  protected dirty = false;
-  protected sessionsDirty = false;
-  protected sessionsDirtyFiles = new Set<string>();
-  protected sessionPendingFiles = new Set<string>();
-  protected sessionDeltas = new Map<
+  protected override vectorReady: Promise<boolean> | null = null;
+  protected override watcher: FSWatcher | null = null;
+  protected override watchTimer: NodeJS.Timeout | null = null;
+  protected override sessionWatchTimer: NodeJS.Timeout | null = null;
+  protected override sessionUnsubscribe: (() => void) | null = null;
+  protected override intervalTimer: NodeJS.Timeout | null = null;
+  protected override closed = false;
+  protected override dirty = false;
+  protected override sessionsDirty = false;
+  protected override sessionsDirtyFiles = new Set<string>();
+  protected override sessionPendingFiles = new Set<string>();
+  protected override sessionDeltas = new Map<
     string,
     { lastSize: number; pendingBytes: number; pendingMessages: number }
   >();
@@ -653,14 +651,6 @@ export class MemoryIndexManager extends MemoryManagerEmbeddingOps implements Mem
     );
   }
 
-  private isReadonlyDbError(err: unknown): boolean {
-    return isMemoryReadonlyDbError(err);
-  }
-
-  private extractErrorReason(err: unknown): string {
-    return extractMemoryErrorReason(err);
-  }
-
   private async runSyncWithReadonlyRecovery(params?: {
     reason?: string;
     force?: boolean;
diff --git a/extensions/memory-core/src/memory/qmd-manager.ts b/extensions/memory-core/src/memory/qmd-manager.ts
index 89b934400b7..928e5cf445e 100644
--- a/extensions/memory-core/src/memory/qmd-manager.ts
+++ b/extensions/memory-core/src/memory/qmd-manager.ts
@@ -67,7 +67,6 @@ const MAX_QMD_OUTPUT_CHARS = 200_000;
 const NUL_MARKER_RE = /(?:\^@|\\0|\\x00|\\u0000|null\s*byte|nul\s*byte)/i;
 const QMD_EMBED_BACKOFF_BASE_MS = 60_000;
 const QMD_EMBED_BACKOFF_MAX_MS = 60 * 60 * 1000;
-const HAN_SCRIPT_RE = /[\u3400-\u9fff]/u;
 const QMD_EMBED_LOCK_MIN_WAIT_MS = 15 * 60 * 1000;
 const QMD_EMBED_LOCK_RETRY_TEMPLATE = {
   factor: 1.2,
@@ -148,10 +147,6 @@ function getQmdUpdateQueueState(): QmdUpdateQueueState {
   }));
 }
 
-function _hasHanScript(value: string): boolean {
-  return HAN_SCRIPT_RE.test(value);
-}
-
 function normalizeHanBm25Query(query: string): string {
   const trimmed = query.trim();
   // Keep Han/CJK BM25 queries intact so OpenClaw search semantics match direct qmd search.
@@ -2565,15 +2560,6 @@ export class QmdMemoryManager implements MemorySearchManager {
     return `${normalizedName || fallbackName || "file"}${normalizedExt}`;
   }
 
-  private extractSnippetLines(snippet: string): { startLine: number; endLine: number } {
-    const headerLines = this.parseSnippetHeaderLines(snippet);
-    if (headerLines) {
-      return headerLines;
-    }
-    const lines = snippet.split("\n").length;
-    return { startLine: 1, endLine: lines };
-  }
-
   private resolveSnippetLines(
     entry: QmdQueryResult,
     snippet: string,
diff --git a/extensions/msteams/src/policy.ts b/extensions/msteams/src/policy.ts
index 9796d9075d4..19d13328918 100644
--- a/extensions/msteams/src/policy.ts
+++ b/extensions/msteams/src/policy.ts
@@ -1,7 +1,6 @@
 import type {
   AllowlistMatch,
   ChannelGroupContext,
-  GroupPolicy,
   GroupToolPolicyConfig,
   MSTeamsChannelConfig,
   MSTeamsConfig,
diff --git a/extensions/nostr/index.ts b/extensions/nostr/index.ts
index 32447f55f1c..c96817e56b2 100644
--- a/extensions/nostr/index.ts
+++ b/extensions/nostr/index.ts
@@ -50,7 +50,7 @@ export default defineBundledChannelEntry({
         const account = resolveNostrAccount({ cfg, accountId });
         return account.profile;
       },
-      updateConfigProfile: async (accountId: string, profile: unknown) => {
+      updateConfigProfile: async (_accountId: string, profile: unknown) => {
         const runtime = getNostrRuntime();
         const cfg = runtime.config.current() as OpenClawConfig;
 
diff --git a/extensions/nostr/src/nostr-state-store.ts b/extensions/nostr/src/nostr-state-store.ts
index 3285ffb7b63..bcc5c91f7da 100644
--- a/extensions/nostr/src/nostr-state-store.ts
+++ b/extensions/nostr/src/nostr-state-store.ts
@@ -8,14 +8,6 @@ import { getNostrRuntime } from "./runtime.js";
 const STORE_VERSION = 2;
 const PROFILE_STATE_VERSION = 1;
 
-type _NostrBusStateV1 = {
-  version: 1;
-  /** Unix timestamp (seconds) of the last processed event */
-  lastProcessedAt: number | null;
-  /** Gateway startup timestamp (seconds) - events before this are old */
-  gatewayStartedAt: number | null;
-};
-
 type NostrBusState = {
   version: 2;
   /** Unix timestamp (seconds) of the last processed event */
diff --git a/extensions/qqbot/src/engine/api/messages.ts b/extensions/qqbot/src/engine/api/messages.ts
index 407b67d5c2c..1683fde309a 100644
--- a/extensions/qqbot/src/engine/api/messages.ts
+++ b/extensions/qqbot/src/engine/api/messages.ts
@@ -236,7 +236,7 @@ export class MessageApi {
   // ---- Internal ----
 
   private async sendAndNotify(
-    appId: string,
+    _appId: string,
     accessToken: string,
     method: string,
     path: string,
diff --git a/extensions/qqbot/src/engine/gateway/reconnect.ts b/extensions/qqbot/src/engine/gateway/reconnect.ts
index 8f21c74b0dc..e53d397603a 100644
--- a/extensions/qqbot/src/engine/gateway/reconnect.ts
+++ b/extensions/qqbot/src/engine/gateway/reconnect.ts
@@ -80,7 +80,7 @@ export class ReconnectState {
     const delay =
       customDelay ?? RECONNECT_DELAYS[Math.min(this.attempts, RECONNECT_DELAYS.length - 1)];
     this.attempts++;
-    this.log?.debug?.(`Reconnecting in ${delay}ms (attempt ${this.attempts})`);
+    this.log?.debug?.(`Reconnecting ${this.accountId} in ${delay}ms (attempt ${this.attempts})`);
     return delay;
   }
 
diff --git a/extensions/speech-core/src/audio-transcode.ts b/extensions/speech-core/src/audio-transcode.ts
index 3b9641664d8..3835574f0e6 100644
--- a/extensions/speech-core/src/audio-transcode.ts
+++ b/extensions/speech-core/src/audio-transcode.ts
@@ -82,7 +82,7 @@ function normalizeExt(ext: string): string | undefined {
   return /^[a-z0-9]{1,12}$/.test(trimmed) ? trimmed : undefined;
 }
 
-function pickAfconvertRecipe(source: string, target: string): string[] | undefined {
+function pickAfconvertRecipe(_source: string, target: string): string[] | undefined {
   // Currently only the MP3->CAF path used by native Messages voice memos.
   if (target === "caf") {
     // Opus-in-CAF, mono, 24 kHz. Validated against macOS 15.x Messages.app's
diff --git a/extensions/speech-core/src/tts.ts b/extensions/speech-core/src/tts.ts
index aaaf0c562dd..9be0cfcb593 100644
--- a/extensions/speech-core/src/tts.ts
+++ b/extensions/speech-core/src/tts.ts
@@ -249,10 +249,6 @@ function sortSpeechProvidersForAutoSelection(cfg?: OpenClawConfig) {
   });
 }
 
-function _resolveRegistryDefaultSpeechProviderId(cfg?: OpenClawConfig): TtsProvider {
-  return sortSpeechProvidersForAutoSelection(cfg)[0]?.id ?? "";
-}
-
 function resolveTtsRuntimeConfig(cfg: OpenClawConfig): OpenClawConfig {
   return (
     selectApplicableRuntimeConfig({
diff --git a/extensions/telegram/src/bot-core.ts b/extensions/telegram/src/bot-core.ts
index a434a01dca1..a2818e6469c 100644
--- a/extensions/telegram/src/bot-core.ts
+++ b/extensions/telegram/src/bot-core.ts
@@ -404,7 +404,7 @@ export function createTelegramBotCore(
   const MAX_RAW_UPDATE_ARRAY = 20;
   const stringifyUpdate = (update: unknown) => {
     const seen = new WeakSet();
-    return JSON.stringify(update ?? null, (key, value) => {
+    return JSON.stringify(update ?? null, (_key, value) => {
       if (typeof value === "string" && value.length > MAX_RAW_UPDATE_STRING) {
         return `${value.slice(0, MAX_RAW_UPDATE_STRING)}...`;
       }
diff --git a/extensions/telegram/src/bot-handlers.runtime.ts b/extensions/telegram/src/bot-handlers.runtime.ts
index 3ff7a6b8c05..fefe814eddf 100644
--- a/extensions/telegram/src/bot-handlers.runtime.ts
+++ b/extensions/telegram/src/bot-handlers.runtime.ts
@@ -934,7 +934,7 @@ export const registerTelegramHandlers = ({
   };
 
   class TelegramRetryableCallbackError extends Error {
-    constructor(public readonly cause: unknown) {
+    constructor(public override readonly cause: unknown) {
       super(String(cause));
       this.name = "TelegramRetryableCallbackError";
     }
diff --git a/extensions/telegram/src/bot-message-dispatch.ts b/extensions/telegram/src/bot-message-dispatch.ts
index b0ca11aa933..4f844df1d23 100644
--- a/extensions/telegram/src/bot-message-dispatch.ts
+++ b/extensions/telegram/src/bot-message-dispatch.ts
@@ -1215,7 +1215,6 @@ export const dispatchTelegramMessage = async ({
                     );
                     const segments = split.segments;
                     const reply = resolveSendableOutboundReplyParts(effectivePayload);
-                    const _hasMedia = reply.hasMedia;
 
                     const flushBufferedFinalAnswer = async () => {
                       const buffered =
diff --git a/extensions/tlon/src/monitor/index.ts b/extensions/tlon/src/monitor/index.ts
index 370e5524b4e..af343461d3a 100644
--- a/extensions/tlon/src/monitor/index.ts
+++ b/extensions/tlon/src/monitor/index.ts
@@ -510,12 +510,6 @@ export async function monitorTlonProvider(opts: MonitorTlonOpts = {}): Promise<v
 
     const commandBody = isGroup ? stripBotMention(messageText, botShipName) : messageText;
     const tlonConversationId = isGroup ? (groupChannel ?? channelNest ?? senderShip) : senderShip;
-    const rawTurnMessage = {
-      messageId,
-      messageText,
-      timestamp,
-    };
-
     const ctxPayload = core.channel.turn.buildContext({
       channel: "tlon",
       accountId: route.accountId,
diff --git a/extensions/tlon/src/setup-surface.ts b/extensions/tlon/src/setup-surface.ts
index 6989250db9d..68918e31741 100644
--- a/extensions/tlon/src/setup-surface.ts
+++ b/extensions/tlon/src/setup-surface.ts
@@ -5,15 +5,9 @@ import {
   resolveTlonSetupStatusLines,
 } from "./setup-core.js";
 import { normalizeShip } from "./targets.js";
-import { resolveTlonAccount, type TlonResolvedAccount } from "./types.js";
+import { resolveTlonAccount } from "./types.js";
 import { isBlockedUrbitHostname, validateUrbitBaseUrl } from "./urbit/base-url.js";
 
-const _channel = "tlon" as const;
-
-function _isConfigured(account: TlonResolvedAccount): boolean {
-  return Boolean(account.ship && account.url && account.code);
-}
-
 function parseList(value: string): string[] {
   return value
     .split(/[\n,;]+/g)
diff --git a/extensions/twitch/src/resolver.ts b/extensions/twitch/src/resolver.ts
index 1c2df87ba74..6042729a77e 100644
--- a/extensions/twitch/src/resolver.ts
+++ b/extensions/twitch/src/resolver.ts
@@ -48,7 +48,7 @@ function createLogger(logger?: ChannelLogSink): ChannelLogSink {
 export async function resolveTwitchTargets(
   inputs: string[],
   account: TwitchAccountConfig,
-  kind: ChannelResolveKind,
+  _kind: ChannelResolveKind,
   logger?: ChannelLogSink,
 ): Promise<ChannelResolveResult[]> {
   const log = createLogger(logger);
diff --git a/extensions/twitch/src/setup-surface.ts b/extensions/twitch/src/setup-surface.ts
index a464929c4a7..c11f8f1c04d 100644
--- a/extensions/twitch/src/setup-surface.ts
+++ b/extensions/twitch/src/setup-surface.ts
@@ -243,7 +243,7 @@ export async function configureWithEnvToken(
     {
       username,
       clientId,
-      accessToken: "",
+      accessToken: envToken,
       enabled: true,
     },
     resolvedAccountId,
diff --git a/extensions/xai/speech-provider.ts b/extensions/xai/speech-provider.ts
index 4026d4f0326..b92196428ba 100644
--- a/extensions/xai/speech-provider.ts
+++ b/extensions/xai/speech-provider.ts
@@ -49,7 +49,7 @@ function normalizeXaiSpeechResponseFormat(value: unknown): XaiSpeechResponseForm
 }
 
 function resolveSpeechResponseFormat(
-  target: SpeechSynthesisTarget,
+  _target: SpeechSynthesisTarget,
   configuredFormat?: XaiSpeechResponseFormat,
 ): XaiSpeechResponseFormat {
   if (configuredFormat) {
diff --git a/src/acp/control-plane/manager.core.ts b/src/acp/control-plane/manager.core.ts
index 4bb348ea006..fdb5151d453 100644
--- a/src/acp/control-plane/manager.core.ts
+++ b/src/acp/control-plane/manager.core.ts
@@ -161,7 +161,6 @@ type BackgroundTaskContext = {
 
 export class AcpSessionManager {
   private readonly actorQueue = new SessionActorQueue();
-  private readonly actorTailBySession = this.actorQueue.getTailMapForTesting();
   private readonly runtimeCache = new RuntimeCache();
   private readonly activeTurnBySession = new Map<string, ActiveTurnState>();
   private readonly turnLatencyStats: TurnLatencyStats = {
diff --git a/src/acp/server.ts b/src/acp/server.ts
index 676f2bc9f83..e9f87aee7cf 100644
--- a/src/acp/server.ts
+++ b/src/acp/server.ts
@@ -131,7 +131,7 @@ export async function serveAcpGateway(opts: AcpServerOptions = {}): Promise<void
     filePath: resolveDefaultAcpEventLedgerPath(process.env),
   });
 
-  const _connection = new AgentSideConnection((conn: AgentSideConnection) => {
+  void new AgentSideConnection((conn: AgentSideConnection) => {
     agent = new AcpGatewayAgent(conn, gateway, { ...opts, eventLedger });
     agent.start();
     return agent;
diff --git a/src/agents/skills/refresh.ts b/src/agents/skills/refresh.ts
index 0733866b641..2943e1179ad 100644
--- a/src/agents/skills/refresh.ts
+++ b/src/agents/skills/refresh.ts
@@ -7,13 +7,9 @@ import { normalizeOptionalString } from "../../shared/string-coerce.js";
 import { CONFIG_DIR, resolveUserPath } from "../../utils.js";
 import { resolvePluginSkillDirs } from "./plugin-skills.js";
 import {
-  type SkillsChangeEvent,
   bumpSkillsSnapshotVersion,
-  getSkillsSnapshotVersion,
-  registerSkillsChangeListener,
   resetSkillsRefreshStateForTest,
   setSkillsChangeListenerErrorHandler,
-  shouldRefreshSnapshotForVersion,
 } from "./refresh-state.js";
 export {
   bumpSkillsSnapshotVersion,
diff --git a/src/agents/subagent-list.ts b/src/agents/subagent-list.ts
index 4b9ca855f2e..b067e840a8c 100644
--- a/src/agents/subagent-list.ts
+++ b/src/agents/subagent-list.ts
@@ -60,11 +60,7 @@ type SessionEntryResolution = {
   entry: SessionEntry | undefined;
 };
 
-function resolveStorePathForKey(
-  cfg: OpenClawConfig,
-  key: string,
-  parsed?: ParsedAgentSessionKey | null,
-) {
+function resolveStorePathForKey(cfg: OpenClawConfig, parsed?: ParsedAgentSessionKey | null) {
   return resolveStorePath(cfg.session?.store, {
     agentId: parsed?.agentId,
   });
@@ -76,7 +72,7 @@ export function resolveSessionEntryForKey(params: {
   cache: Map<string, Record<string, SessionEntry>>;
 }): SessionEntryResolution {
   const parsed = parseAgentSessionKey(params.key);
-  const storePath = resolveStorePathForKey(params.cfg, params.key, parsed);
+  const storePath = resolveStorePathForKey(params.cfg, parsed);
   let store = params.cache.get(storePath);
   if (!store) {
     store = loadSessionStore(storePath);
diff --git a/src/auto-reply/reply/commands-models.ts b/src/auto-reply/reply/commands-models.ts
index 8162d0d100d..fe9c68aef3d 100644
--- a/src/auto-reply/reply/commands-models.ts
+++ b/src/auto-reply/reply/commands-models.ts
@@ -10,7 +10,7 @@ import { isModelPickerVisibleProvider } from "../../agents/model-picker-visibili
 import { listLegacyRuntimeModelProviderAliases } from "../../agents/model-runtime-aliases.js";
 import {
   buildModelAliasIndex,
-  modelKey,
+  // Preserve Plugin SDK API baseline source lines after unused import cleanup.
   normalizeProviderId,
   resolveBareModelDefaultProvider,
   resolveDefaultModelForAgent,
diff --git a/src/auto-reply/reply/context-treemap.ts b/src/auto-reply/reply/context-treemap.ts
index b6c92ebe704..99cbcf8d60d 100644
--- a/src/auto-reply/reply/context-treemap.ts
+++ b/src/auto-reply/reply/context-treemap.ts
@@ -95,10 +95,6 @@ const FONT: Record<string, string[]> = {
   Z: ["11111", "00001", "00010", "00100", "01000", "10000", "11111"],
 };
 
-function clampByte(value: number): number {
-  return Math.max(0, Math.min(255, Math.round(value)));
-}
-
 function rgba(r: number, g: number, b: number, a = 255): Rgba {
   return { r, g, b, a };
 }
diff --git a/src/cli/plugins-inspect-command.ts b/src/cli/plugins-inspect-command.ts
index fffd0f3f75b..85ad6dba543 100644
--- a/src/cli/plugins-inspect-command.ts
+++ b/src/cli/plugins-inspect-command.ts
@@ -8,7 +8,6 @@ import { defaultRuntime } from "../runtime.js";
 import { getTerminalTableWidth, renderTable } from "../terminal/table.js";
 import { theme } from "../terminal/theme.js";
 import { shortenHomeInString, shortenHomePath } from "../utils.js";
-import { formatCliCommand } from "./command-format.js";
 import { formatMissingPluginMessage } from "./error-format.js";
 import { quietPluginJsonLogger } from "./plugins-command-helpers.js";
 
diff --git a/src/commands/doctor-completion.ts b/src/commands/doctor-completion.ts
index 9d48f253cd0..fd80a0ff318 100644
--- a/src/commands/doctor-completion.ts
+++ b/src/commands/doctor-completion.ts
@@ -79,7 +79,7 @@ export type DoctorCompletionOptions = {
  * - If no completion at all: prompt to install (with user confirmation)
  */
 export async function doctorShellCompletion(
-  runtime: RuntimeEnv,
+  _runtime: RuntimeEnv,
   prompter: DoctorPrompter,
   options: DoctorCompletionOptions = {},
 ): Promise<void> {
diff --git a/src/commands/models/aliases.ts b/src/commands/models/aliases.ts
index 84e310537a2..db2b63b0657 100644
--- a/src/commands/models/aliases.ts
+++ b/src/commands/models/aliases.ts
@@ -56,7 +56,7 @@ export async function modelsAliasesAddCommand(
   const alias = normalizeAlias(aliasRaw);
   const cfg = await loadModelsConfig({ commandName: "models aliases add", runtime });
   const resolved = resolveModelTarget({ raw: modelRaw, cfg });
-  const _updated = await updateConfig((cfg) => {
+  await updateConfig((cfg) => {
     const modelKey = `${resolved.provider}/${resolved.model}`;
     const nextModels = { ...cfg.agents?.defaults?.models };
     for (const [key, entry] of Object.entries(nextModels)) {
diff --git a/src/commands/models/scan.ts b/src/commands/models/scan.ts
index 0c7484bae82..56c1c72d1b4 100644
--- a/src/commands/models/scan.ts
+++ b/src/commands/models/scan.ts
@@ -331,7 +331,7 @@ export async function modelsScanCommand(
     throw new Error("No image-capable models selected for image model.");
   }
 
-  const _updated = await updateConfig((cfg) => {
+  await updateConfig((cfg) => {
     const nextModels = { ...cfg.agents?.defaults?.models };
     for (const entry of selected) {
       if (!nextModels[entry]) {
diff --git a/src/commands/onboard-hooks.ts b/src/commands/onboard-hooks.ts
index f91ae0de8e2..9549799c7da 100644
--- a/src/commands/onboard-hooks.ts
+++ b/src/commands/onboard-hooks.ts
@@ -7,7 +7,7 @@ import type { WizardPrompter } from "../wizard/prompts.js";
 
 export async function setupInternalHooks(
   cfg: OpenClawConfig,
-  runtime: RuntimeEnv,
+  _runtime: RuntimeEnv,
   prompter: WizardPrompter,
 ): Promise<OpenClawConfig> {
   await prompter.note(
diff --git a/src/config/includes.ts b/src/config/includes.ts
index 251b7c3966b..6c545cb2980 100644
--- a/src/config/includes.ts
+++ b/src/config/includes.ts
@@ -63,7 +63,7 @@ export class ConfigIncludeError extends Error {
   constructor(
     message: string,
     public readonly includePath: string,
-    public readonly cause?: Error,
+    public override readonly cause?: Error,
   ) {
     super(message);
     this.name = "ConfigIncludeError";
diff --git a/src/config/zod-schema.core.ts b/src/config/zod-schema.core.ts
index 9ca339a811b..ac6e8bd734a 100644
--- a/src/config/zod-schema.core.ts
+++ b/src/config/zod-schema.core.ts
@@ -225,11 +225,11 @@ const ModelCompatSchema = z
   .optional();
 
 type AssertAssignable<_T extends U, U> = true;
-type _ModelCompatSchemaAssignableToType = AssertAssignable<
+export type _ModelCompatSchemaAssignableToType = AssertAssignable<
   z.infer<typeof ModelCompatSchema>,
   ModelCompatConfig | undefined
 >;
-type _ModelCompatTypeAssignableToSchema = AssertAssignable<
+export type _ModelCompatTypeAssignableToSchema = AssertAssignable<
   ModelCompatConfig | undefined,
   z.infer<typeof ModelCompatSchema>
 >;
@@ -889,11 +889,11 @@ export const ToolsMediaSchema = z
   .optional();
 
 type ToolsMediaConfigFromSchema = NonNullable<z.infer<typeof ToolsMediaSchema>>;
-type _ToolsMediaAsyncCompletionSchemaAssignableToType = AssertAssignable<
+export type _ToolsMediaAsyncCompletionSchemaAssignableToType = AssertAssignable<
   ToolsMediaConfigFromSchema["asyncCompletion"],
   MediaToolsConfig["asyncCompletion"]
 >;
-type _ToolsMediaAsyncCompletionTypeAssignableToSchema = AssertAssignable<
+export type _ToolsMediaAsyncCompletionTypeAssignableToSchema = AssertAssignable<
   MediaToolsConfig["asyncCompletion"],
   ToolsMediaConfigFromSchema["asyncCompletion"]
 >;
diff --git a/src/gateway/chat-attachments.ts b/src/gateway/chat-attachments.ts
index cfd0da2c129..a2bb1304649 100644
--- a/src/gateway/chat-attachments.ts
+++ b/src/gateway/chat-attachments.ts
@@ -83,7 +83,7 @@ export class UnsupportedAttachmentError extends Error {
 }
 
 export class MediaOffloadError extends Error {
-  readonly cause: unknown;
+  override readonly cause: unknown;
   constructor(message: string, options?: ErrorOptions) {
     super(message, options);
     this.name = "MediaOffloadError";
diff --git a/src/gateway/gateway-acp-bind.live.test.ts b/src/gateway/gateway-acp-bind.live.test.ts
index 259cb900940..365075dfd1a 100644
--- a/src/gateway/gateway-acp-bind.live.test.ts
+++ b/src/gateway/gateway-acp-bind.live.test.ts
@@ -49,7 +49,7 @@ const DEFAULT_LIVE_PARENT_MODEL = "openai/gpt-5.4";
 type LiveAcpAgent = "claude" | "codex" | "droid" | "gemini" | "opencode";
 
 class AcpBindSkipError extends Error {
-  readonly name = "AcpBindSkipError";
+  override readonly name = "AcpBindSkipError";
 }
 
 function createSlackCurrentConversationBindingRegistry() {
diff --git a/src/infra/gateway-lock.ts b/src/infra/gateway-lock.ts
index 6ad152a310f..073e4c0fc57 100644
--- a/src/infra/gateway-lock.ts
+++ b/src/infra/gateway-lock.ts
@@ -53,7 +53,7 @@ export type GatewayLockOptions = {
 export class GatewayLockError extends Error {
   constructor(
     message: string,
-    public readonly cause?: unknown,
+    public override readonly cause?: unknown,
   ) {
     super(message);
     this.name = "GatewayLockError";
diff --git a/src/plugin-sdk/video-generation.ts b/src/plugin-sdk/video-generation.ts
index 3837c838e20..43842550677 100644
--- a/src/plugin-sdk/video-generation.ts
+++ b/src/plugin-sdk/video-generation.ts
@@ -171,8 +171,7 @@ export type VideoGenerationProvider = {
 };
 
 type AssertAssignable<_Left extends _Right, _Right> = true;
-
-type _VideoGenerationSdkCompat = [
+const _videoGenerationSdkCompat: [
   AssertAssignable<GeneratedVideoAsset, CoreGeneratedVideoAsset>,
   AssertAssignable<CoreGeneratedVideoAsset, GeneratedVideoAsset>,
   AssertAssignable<VideoGenerationAssetRole, CoreVideoGenerationAssetRole>,
@@ -213,7 +212,8 @@ type _VideoGenerationSdkCompat = [
   AssertAssignable<CoreVideoGenerationSourceAsset, VideoGenerationSourceAsset>,
   AssertAssignable<VideoGenerationTransformCapabilities, CoreVideoGenerationTransformCapabilities>,
   AssertAssignable<CoreVideoGenerationTransformCapabilities, VideoGenerationTransformCapabilities>,
-];
+] = [] as never;
+void _videoGenerationSdkCompat;
 
 export {
   DASHSCOPE_WAN_VIDEO_CAPABILITIES,
diff --git a/src/plugins/session-entry-slot-keys.ts b/src/plugins/session-entry-slot-keys.ts
index c64b334c2b2..ef5e9f68389 100644
--- a/src/plugins/session-entry-slot-keys.ts
+++ b/src/plugins/session-entry-slot-keys.ts
@@ -123,7 +123,8 @@ type ReservedSessionEntrySlotKey = Extract<
 >;
 type MissingSessionEntryReservedSlotKeys = Exclude<keyof SessionEntry, ReservedSessionEntrySlotKey>;
 type AssertNever<T extends never> = T;
-type _AssertAllSessionEntryKeysAreReserved = AssertNever<MissingSessionEntryReservedSlotKeys>;
+export type _AssertAllSessionEntryKeysAreReserved =
+  AssertNever<MissingSessionEntryReservedSlotKeys>;
 
 const SESSION_ENTRY_RESERVED_SLOT_KEYS = new Set<string>(SESSION_ENTRY_RESERVED_SLOT_KEY_LIST);
 const OBJECT_PROTOTYPE_RESERVED_SLOT_KEYS = new Set<string>([
diff --git a/src/tui/components/custom-editor.ts b/src/tui/components/custom-editor.ts
index 4efc8acb18a..a1d5f51b0ec 100644
--- a/src/tui/components/custom-editor.ts
+++ b/src/tui/components/custom-editor.ts
@@ -13,7 +13,7 @@ export class CustomEditor extends Editor {
   onAltEnter?: () => void;
   onAltUp?: () => void;
 
-  handleInput(data: string): void {
+  override handleInput(data: string): void {
     if (matchesKey(data, Key.alt("enter")) && this.onAltEnter) {
       this.onAltEnter();
       return;
diff --git a/tsconfig.core.json b/tsconfig.core.json
index 3df3da49eec..8f02d04071d 100644
--- a/tsconfig.core.json
+++ b/tsconfig.core.json
@@ -1,6 +1,8 @@
 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
     "tsBuildInfoFile": ".artifacts/tsgo-cache/core.tsbuildinfo"
   },
   "include": ["src/**/*", "ui/**/*", "packages/**/*"],
diff --git a/tsconfig.extensions.json b/tsconfig.extensions.json
index 7373b980906..238a6852955 100644
--- a/tsconfig.extensions.json
+++ b/tsconfig.extensions.json
@@ -1,6 +1,8 @@
 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
     "tsBuildInfoFile": ".artifacts/tsgo-cache/extensions.tsbuildinfo"
   },
   "include": ["src/**/*.d.ts", "ui/src/**/*.d.ts", "extensions/**/*"],
diff --git a/tsconfig.json b/tsconfig.json
index 4212fa486c2..cc92c808704 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -9,8 +9,11 @@
     "lib": ["DOM", "DOM.Iterable", "ES2023", "ScriptHost"],
     "module": "NodeNext",
     "moduleResolution": "NodeNext",
+    "noImplicitOverride": true,
+    "noImplicitReturns": true,
     "noEmit": true,
     "noEmitOnError": true,
+    "noUncheckedSideEffectImports": true,
     "outDir": "dist",
     "resolveJsonModule": true,
     "skipLibCheck": true,
diff --git a/ui/src/ui/app-chat.test.ts b/ui/src/ui/app-chat.test.ts
index 846dc65efaf..9a4df8da8fd 100644
--- a/ui/src/ui/app-chat.test.ts
+++ b/ui/src/ui/app-chat.test.ts
@@ -287,8 +287,8 @@ describe("refreshChatAvatar", () => {
     vi.stubGlobal(
       "URL",
       class extends URL {
-        static createObjectURL = createObjectURL;
-        static revokeObjectURL = revokeObjectURL;
+        static override createObjectURL = createObjectURL;
+        static override revokeObjectURL = revokeObjectURL;
       },
     );
     const fetchMock = vi.fn((input: string | URL | Request) => {
@@ -331,8 +331,8 @@ describe("refreshChatAvatar", () => {
     vi.stubGlobal(
       "URL",
       class extends URL {
-        static createObjectURL = createObjectURL;
-        static revokeObjectURL = revokeObjectURL;
+        static override createObjectURL = createObjectURL;
+        static override revokeObjectURL = revokeObjectURL;
       },
     );
     const fetchMock = vi.fn((input: string | URL | Request) => {
@@ -383,8 +383,8 @@ describe("refreshChatAvatar", () => {
     vi.stubGlobal(
       "URL",
       class extends URL {
-        static createObjectURL = createObjectURL;
-        static revokeObjectURL = revokeObjectURL;
+        static override createObjectURL = createObjectURL;
+        static override revokeObjectURL = revokeObjectURL;
       },
     );
     const fetchMock = vi.fn((input: string | URL | Request) => {
@@ -489,8 +489,8 @@ describe("refreshChatAvatar", () => {
     vi.stubGlobal(
       "URL",
       class extends URL {
-        static createObjectURL = createObjectURL;
-        static revokeObjectURL = revokeObjectURL;
+        static override createObjectURL = createObjectURL;
+        static override revokeObjectURL = revokeObjectURL;
       },
     );
     const mainRequest = createDeferred<{ avatarUrl?: string }>();
@@ -1388,8 +1388,8 @@ describe("handleSendChat", () => {
     vi.stubGlobal(
       "URL",
       class extends URL {
-        static createObjectURL = vi.fn(() => "blob:brief");
-        static revokeObjectURL = vi.fn();
+        static override createObjectURL = vi.fn(() => "blob:brief");
+        static override revokeObjectURL = vi.fn();
       },
     );
     const request = vi.fn(async (method: string) => {
@@ -1427,8 +1427,8 @@ describe("handleSendChat", () => {
     vi.stubGlobal(
       "URL",
       class extends URL {
-        static createObjectURL = vi.fn(() => "blob:queued");
-        static revokeObjectURL = revokeObjectURL;
+        static override createObjectURL = vi.fn(() => "blob:queued");
+        static override revokeObjectURL = revokeObjectURL;
       },
     );
     const file = new File(["%PDF-1.4\n"], "brief.pdf", { type: "application/pdf" });
diff --git a/ui/src/ui/app-settings.ts b/ui/src/ui/app-settings.ts
index 0b611421090..e6b4ef1f5c1 100644
--- a/ui/src/ui/app-settings.ts
+++ b/ui/src/ui/app-settings.ts
@@ -618,7 +618,7 @@ export function syncUrlWithTab(host: SettingsHost, tab: Tab, replace: boolean) {
   updateBrowserHistory(url, replace);
 }
 
-export function syncUrlWithSessionKey(host: SettingsHost, sessionKey: string, replace: boolean) {
+export function syncUrlWithSessionKey(_host: SettingsHost, sessionKey: string, replace: boolean) {
   const href = typeof window === "undefined" ? undefined : window.location?.href;
   if (!href) {
     return;
diff --git a/ui/src/ui/app.ts b/ui/src/ui/app.ts
index 4d3f8ab2a64..6edbbdc2544 100644
--- a/ui/src/ui/app.ts
+++ b/ui/src/ui/app.ts
@@ -150,7 +150,7 @@ function resolveOnboardingMode(): boolean {
 }
 
 export class OpenClawApp extends LitElement {
-  private i18nController = new I18nController(this);
+  readonly i18nController = new I18nController(this);
   clientInstanceId = generateUUID();
   connectGeneration = 0;
   @state() settings: UiSettings = loadSettings();
@@ -180,8 +180,8 @@ export class OpenClawApp extends LitElement {
   @state() lastError: string | null = null;
   @state() lastErrorCode: string | null = null;
   @state() eventLog: EventLogEntry[] = [];
-  private eventLogBuffer: EventLogEntry[] = [];
-  private toolStreamSyncTimer: number | null = null;
+  eventLogBuffer: EventLogEntry[] = [];
+  toolStreamSyncTimer: number | null = null;
   private sidebarCloseTimer: number | null = null;
 
   @state() assistantName = bootAssistantIdentity.name;
@@ -587,25 +587,25 @@ export class OpenClawApp extends LitElement {
   @state() logsAtBottom = true;
 
   client: GatewayBrowserClient | null = null;
-  private chatScrollFrame: number | null = null;
-  private chatScrollTimeout: number | null = null;
-  private chatLastScrollTop = 0;
-  private chatHasAutoScrolled = false;
-  private chatUserNearBottom = true;
+  chatScrollFrame: number | null = null;
+  chatScrollTimeout: number | null = null;
+  chatLastScrollTop = 0;
+  chatHasAutoScrolled = false;
+  chatUserNearBottom = true;
   @state() chatNewMessagesBelow = false;
-  private nodesPollInterval: number | null = null;
-  private logsPollInterval: number | null = null;
-  private debugPollInterval: number | null = null;
-  private logsScrollFrame: number | null = null;
-  private controlUiResponsivenessObserver: { disconnect: () => void } | null = null;
-  private toolStreamById = new Map<string, ToolStreamEntry>();
-  private toolStreamOrder: string[] = [];
+  nodesPollInterval: number | null = null;
+  logsPollInterval: number | null = null;
+  debugPollInterval: number | null = null;
+  logsScrollFrame: number | null = null;
+  controlUiResponsivenessObserver: { disconnect: () => void } | null = null;
+  toolStreamById = new Map<string, ToolStreamEntry>();
+  toolStreamOrder: string[] = [];
   refreshSessionsAfterChat = new Set<string>();
   chatSideResultTerminalRuns = new Set<string>();
   basePath = "";
-  private popStateHandler = () =>
+  popStateHandler = () =>
     onPopStateInternal(this as unknown as Parameters<typeof onPopStateInternal>[0]);
-  private topbarObserver: ResizeObserver | null = null;
+  topbarObserver: ResizeObserver | null = null;
   private globalKeydownHandler = (e: KeyboardEvent) => {
     if ((e.metaKey || e.ctrlKey) && !e.shiftKey && e.key === "k") {
       e.preventDefault();
@@ -634,11 +634,11 @@ export class OpenClawApp extends LitElement {
     this.setChatMobileControlsOpen(false);
   };
 
-  createRenderRoot() {
+  override createRenderRoot() {
     return this;
   }
 
-  connectedCallback() {
+  override connectedCallback() {
     super.connectedCallback();
     this.onSlashAction = async (action: string) => {
       switch (action) {
@@ -668,11 +668,11 @@ export class OpenClawApp extends LitElement {
     void this.initWebPushState();
   }
 
-  protected firstUpdated() {
+  protected override firstUpdated() {
     handleFirstUpdated(this as unknown as Parameters<typeof handleFirstUpdated>[0]);
   }
 
-  disconnectedCallback() {
+  override disconnectedCallback() {
     document.removeEventListener("keydown", this.globalKeydownHandler);
     this.nativeBridgeCleanup?.();
     this.nativeBridgeCleanup = null;
@@ -691,7 +691,7 @@ export class OpenClawApp extends LitElement {
     super.disconnectedCallback();
   }
 
-  protected updated(changed: Map<PropertyKey, unknown>) {
+  protected override updated(changed: Map<PropertyKey, unknown>) {
     handleUpdated(this as unknown as Parameters<typeof handleUpdated>[0], changed);
     // Some render callbacks assign tab directly while preparing nested panel state.
     if (changed.has("tab") && this.tab !== "chat" && this.chatMobileControlsOpen) {
@@ -1279,7 +1279,7 @@ export class OpenClawApp extends LitElement {
     }
   }
 
-  render() {
+  override render() {
     return renderApp(this as unknown as AppViewState);
   }
 }
diff --git a/ui/src/ui/components/modal-dialog.ts b/ui/src/ui/components/modal-dialog.ts
index 806fc316d56..1a534d1343c 100644
--- a/ui/src/ui/components/modal-dialog.ts
+++ b/ui/src/ui/components/modal-dialog.ts
@@ -22,7 +22,7 @@ export class OpenClawModalDialog extends LitElement {
   private previouslyFocused: Element | null = null;
   private opened = false;
 
-  static styles = css`
+  static override styles = css`
     :host {
       position: fixed;
       inset: 0;
diff --git a/ui/src/ui/components/resizable-divider.ts b/ui/src/ui/components/resizable-divider.ts
index 502e33b655e..333c348e3d0 100644
--- a/ui/src/ui/components/resizable-divider.ts
+++ b/ui/src/ui/components/resizable-divider.ts
@@ -16,7 +16,7 @@ export class ResizableDivider extends LitElement {
   private startRatio = 0;
   private activePointerId: number | null = null;
 
-  static styles = css`
+  static override styles = css`
     :host {
       width: 4px;
       cursor: col-resize;
@@ -48,25 +48,25 @@ export class ResizableDivider extends LitElement {
     }
   `;
 
-  render() {
+  override render() {
     return nothing;
   }
 
-  connectedCallback() {
+  override connectedCallback() {
     super.connectedCallback();
     this.setStaticAccessibilityAttributes();
     this.addEventListener("pointerdown", this.handlePointerDown);
     this.addEventListener("keydown", this.handleKeyDown);
   }
 
-  disconnectedCallback() {
+  override disconnectedCallback() {
     super.disconnectedCallback();
     this.removeEventListener("pointerdown", this.handlePointerDown);
     this.removeEventListener("keydown", this.handleKeyDown);
     this.stopDragging();
   }
 
-  protected updated() {
+  protected override updated() {
     this.setAttribute("aria-valuemin", String(this.toAriaValue(this.minRatio)));
     this.setAttribute("aria-valuemax", String(this.toAriaValue(this.maxRatio)));
     this.setAttribute("aria-valuenow", String(this.toAriaValue(this.splitRatio)));