chore(lint): reduce warning debt across core adapters and model clients

src/backends/native/agent.ts

@@ -1,4 +1,4 @@
-import type { ModelClient, Message, ChatRequest, ChatResponse, ModelToolCall, TokenUsage } from '../../models/types.js';
+import type { ModelClient, Message, ChatRequest, ChatResponse, TokenUsage } from '../../models/types.js';
 import type { ModelRouter, ModelTier } from '../../models/router.js';
 import type { Session } from '../../session/index.js';
 import type { ToolRegistry } from '../../tools/registry.js';
@@ -8,7 +8,7 @@ import type { ToolPolicyContext } from '../../tools/policy.js';
 import { auditLogger } from '../../audit/index.js';
 import type { Attachment } from '../../channels/types.js';
 import type { OutboundAttachmentCollector } from './attachments.js';
-import { buildUserMessage, getMessageText } from '../../models/media.js';
+import { buildUserMessage } from '../../models/media.js';
 
 export interface ToolUseEvent {
   type: 'start' | 'end';
@@ -142,7 +142,12 @@ export class NativeAgent {
   }
 
   private async toolLoop(): Promise<string> {
-    const tools = this.toolRegistry!.filteredToAnthropicFormat(this._toolPolicyContext);
+    const toolRegistry = this.toolRegistry;
+    const toolExecutor = this.toolExecutor;
+    if (!toolRegistry || !toolExecutor) {
+      throw new Error('Tool loop requires tool registry and executor');
+    }
+    const tools = toolRegistry.filteredToAnthropicFormat(this._toolPolicyContext);
 
     // Track whether untrusted content (web/fetched/tool output) has been introduced
     // during this run. Used to harden against prompt injection.
@@ -218,7 +223,10 @@ export class NativeAgent {
         }
 
         // Safe to assert non-null — wantsToolUse guarantees toolCalls exists and is non-empty
-        const toolCalls = response.toolCalls!;
+        const toolCalls = response.toolCalls;
+        if (!toolCalls || toolCalls.length === 0) {
+          continue;
+        }
 
         // Check for repeated tool calls — build a fingerprint from tool names + args
         const fingerprint = toolCalls
@@ -264,7 +272,7 @@ export class NativeAgent {
         for (const tc of toolCalls) {
           this.throwIfCancelled();
 
-          const internalName = this.toolRegistry!.getByApiName(tc.name)?.name ?? tc.name;
+          const internalName = toolRegistry.getByApiName(tc.name)?.name ?? tc.name;
           this.onToolUse?.({ type: 'start', tool: internalName, args: tc.args });
 
           let elevationUntilMs: number | undefined;
@@ -311,7 +319,7 @@ export class NativeAgent {
             }
             : undefined;
 
-          const result = await this.toolExecutor!.execute(internalName, tc.args, perCallContext);
+          const result = await toolExecutor.execute(internalName, tc.args, perCallContext);
 
           this.onToolUse?.({ type: 'end', tool: internalName, result });