fix: improve type safety for thinking parameters

- Add proper TypeScript interfaces for thinking parameters
- Replace 'any' types with specific typed interfaces
- Reduce lint warnings from 25 to 21
- Improve code maintainability and type checking

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: nirga

packages/instrumentation-anthropic/src/instrumentation.ts

@@ -31,7 +31,7 @@ import {
   CONTEXT_KEY_ALLOW_TRACE_CONTENT,
   SpanAttributes,
 } from "@traceloop/ai-semantic-conventions";
-import { AnthropicInstrumentationConfig } from "./types";
+import { AnthropicInstrumentationConfig, MessageCreateParamsWithThinking } from "./types";
 import { version } from "../package.json";
 import type * as anthropic from "@anthropic-ai/sdk";
 import type {
@@ -214,14 +214,11 @@ export class AnthropicInstrumentation extends InstrumentationBase {
       attributes[SpanAttributes.LLM_TOP_K] = params.top_k;
 
       // Handle thinking parameters
-      if ((params as any).thinking) {
-        const thinking = (params as any).thinking;
-        if (thinking.type) {
-          attributes["llm.request.thinking.type"] = thinking.type;
-        }
-        if (thinking.budget_tokens) {
-          attributes["llm.request.thinking.budget_tokens"] = thinking.budget_tokens;
-        }
+      const paramsWithThinking = params as MessageCreateParamsWithThinking;
+      if (paramsWithThinking.thinking) {
+        const thinking = paramsWithThinking.thinking;
+        attributes["llm.request.thinking.type"] = thinking.type;
+        attributes["llm.request.thinking.budget_tokens"] = thinking.budget_tokens;
       }
 
       if (type === "completion") {

packages/instrumentation-anthropic/src/types.ts

@@ -8,7 +8,16 @@ export interface AnthropicInstrumentationConfig extends InstrumentationConfig {
   traceContent?: boolean;
 
   /**
-   * A custom logger to log any exceptions that happen during span creation.
+   * A custom logger to log any exceptions that happen during span created.
    */
   exceptionLogger?: (e: Error) => void;
 }
+
+export interface ThinkingParams {
+  type: "enabled";
+  budget_tokens: number;
+}
+
+export interface MessageCreateParamsWithThinking {
+  thinking?: ThinkingParams;
+}

packages/instrumentation-anthropic/test/instrumentation.test.ts

@@ -385,8 +385,14 @@ describe("Test Anthropic instrumentation", async function () {
     const content = JSON.parse(chatSpan.attributes[`${SpanAttributes.LLM_COMPLETIONS}.0.content`] as string);
     assert.ok(Array.isArray(content));
 
-    const thinkingBlock = content.find((block: any) => block.type === "thinking");
-    const textBlock = content.find((block: any) => block.type === "text");
+    interface ContentBlock {
+      type: string;
+      thinking?: string;
+      text?: string;
+    }
+    
+    const thinkingBlock = content.find((block: ContentBlock) => block.type === "thinking");
+    const textBlock = content.find((block: ContentBlock) => block.type === "text");
 
     assert.ok(thinkingBlock, "Should contain a thinking block");
     assert.ok(thinkingBlock.thinking, "Thinking block should have thinking content");