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Badri Narayanan S
285
tests/test-interleaved-thinking.cjs
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285
tests/test-interleaved-thinking.cjs
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/**
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* Interleaved Thinking Test
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*
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* Tests that interleaved thinking works correctly:
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* - Multiple thinking blocks can appear in a single response
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* - Thinking blocks between tool calls
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* - Thinking after tool results
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*
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* This simulates complex Claude Code scenarios where the model
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* thinks multiple times during a single turn.
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*/
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const http = require('http');
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const BASE_URL = 'localhost';
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const PORT = 8080;
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function streamRequest(body) {
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return new Promise((resolve, reject) => {
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const data = JSON.stringify(body);
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const req = http.request({
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host: BASE_URL,
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port: PORT,
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path: '/v1/messages',
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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'x-api-key': 'test',
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'anthropic-version': '2023-06-01',
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'anthropic-beta': 'interleaved-thinking-2025-05-14',
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'Content-Length': Buffer.byteLength(data)
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}
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}, res => {
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const events = [];
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let fullData = '';
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res.on('data', chunk => {
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fullData += chunk.toString();
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});
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res.on('end', () => {
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const parts = fullData.split('\n\n').filter(e => e.trim());
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for (const part of parts) {
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const lines = part.split('\n');
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const eventLine = lines.find(l => l.startsWith('event:'));
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const dataLine = lines.find(l => l.startsWith('data:'));
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if (eventLine && dataLine) {
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try {
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const eventType = eventLine.replace('event:', '').trim();
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const eventData = JSON.parse(dataLine.replace('data:', '').trim());
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events.push({ type: eventType, data: eventData });
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} catch (e) { }
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}
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}
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const content = [];
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let currentBlock = null;
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for (const event of events) {
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if (event.type === 'content_block_start') {
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currentBlock = { ...event.data.content_block };
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if (currentBlock.type === 'thinking') {
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currentBlock.thinking = '';
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currentBlock.signature = '';
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}
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if (currentBlock.type === 'text') currentBlock.text = '';
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} else if (event.type === 'content_block_delta') {
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const delta = event.data.delta;
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if (delta.type === 'thinking_delta' && currentBlock) {
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currentBlock.thinking += delta.thinking || '';
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}
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if (delta.type === 'signature_delta' && currentBlock) {
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currentBlock.signature += delta.signature || '';
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}
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if (delta.type === 'text_delta' && currentBlock) {
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currentBlock.text += delta.text || '';
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}
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if (delta.type === 'input_json_delta' && currentBlock) {
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currentBlock.partial_json = (currentBlock.partial_json || '') + delta.partial_json;
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}
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} else if (event.type === 'content_block_stop') {
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if (currentBlock?.type === 'tool_use' && currentBlock.partial_json) {
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try { currentBlock.input = JSON.parse(currentBlock.partial_json); } catch (e) { }
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delete currentBlock.partial_json;
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}
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if (currentBlock) content.push(currentBlock);
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currentBlock = null;
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}
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}
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const errorEvent = events.find(e => e.type === 'error');
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if (errorEvent) {
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resolve({ content, events, error: errorEvent.data.error, statusCode: res.statusCode });
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} else {
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resolve({ content, events, statusCode: res.statusCode });
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}
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});
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});
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req.on('error', reject);
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req.write(data);
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req.end();
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});
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}
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// Multiple tools to encourage interleaved thinking
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const tools = [{
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name: 'read_file',
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description: 'Read a file',
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input_schema: {
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type: 'object',
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properties: { path: { type: 'string' } },
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required: ['path']
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}
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}, {
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name: 'write_file',
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description: 'Write to a file',
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input_schema: {
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type: 'object',
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properties: {
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path: { type: 'string' },
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content: { type: 'string' }
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},
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required: ['path', 'content']
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}
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}, {
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name: 'run_tests',
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description: 'Run test suite',
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input_schema: {
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type: 'object',
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properties: { pattern: { type: 'string' } },
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required: ['pattern']
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}
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}];
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async function runTests() {
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console.log('='.repeat(60));
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console.log('INTERLEAVED THINKING TEST');
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console.log('Tests complex multi-step reasoning with tools');
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console.log('='.repeat(60));
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console.log('');
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let allPassed = true;
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const results = [];
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// ===== TEST 1: Complex task requiring multiple steps =====
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console.log('TEST 1: Complex task - read, modify, write, test');
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console.log('-'.repeat(40));
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const result = await streamRequest({
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model: 'claude-opus-4-5-thinking',
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max_tokens: 8192,
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stream: true,
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tools,
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thinking: { type: 'enabled', budget_tokens: 16000 },
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messages: [{
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role: 'user',
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content: `I need you to:
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1. Read the file src/config.js
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2. Add a new config option "debug: true"
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3. Write the updated file
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4. Run the tests to make sure nothing broke
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Please do this step by step, reading each file before modifying.`
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}]
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});
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if (result.error) {
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console.log(` ERROR: ${result.error.message}`);
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allPassed = false;
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results.push({ name: 'Complex multi-step task', passed: false });
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} else {
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const thinking = result.content.filter(b => b.type === 'thinking');
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const toolUse = result.content.filter(b => b.type === 'tool_use');
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const text = result.content.filter(b => b.type === 'text');
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console.log(` Thinking blocks: ${thinking.length}`);
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console.log(` Tool use blocks: ${toolUse.length}`);
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console.log(` Text blocks: ${text.length}`);
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// Check signatures
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const signedThinking = thinking.filter(t => t.signature && t.signature.length >= 50);
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console.log(` Signed thinking blocks: ${signedThinking.length}`);
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// Analyze block order
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const blockOrder = result.content.map(b => b.type).join(' -> ');
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console.log(` Block order: ${blockOrder}`);
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// Show thinking previews
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thinking.forEach((t, i) => {
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console.log(` Thinking ${i + 1}: "${(t.thinking || '').substring(0, 50)}..."`);
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});
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// Show tool calls
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toolUse.forEach((t, i) => {
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console.log(` Tool ${i + 1}: ${t.name}(${JSON.stringify(t.input).substring(0, 50)}...)`);
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});
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// Expect at least one thinking block (ideally multiple for complex task)
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const passed = thinking.length >= 1 && signedThinking.length >= 1 && toolUse.length >= 1;
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results.push({ name: 'Thinking + Tools in complex task', passed });
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if (!passed) allPassed = false;
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}
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// ===== TEST 2: Multiple tool calls in sequence =====
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console.log('\nTEST 2: Tool result followed by more thinking');
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console.log('-'.repeat(40));
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// Start with previous result and add tool result
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if (result.content && result.content.some(b => b.type === 'tool_use')) {
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const toolUseBlock = result.content.find(b => b.type === 'tool_use');
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const result2 = await streamRequest({
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model: 'claude-opus-4-5-thinking',
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max_tokens: 8192,
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stream: true,
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tools,
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thinking: { type: 'enabled', budget_tokens: 16000 },
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messages: [
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{
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role: 'user',
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content: `Read src/config.js and tell me if debug mode is enabled.`
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},
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{ role: 'assistant', content: result.content },
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{
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role: 'user',
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content: [{
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type: 'tool_result',
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tool_use_id: toolUseBlock.id,
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content: `module.exports = {
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port: 3000,
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host: 'localhost',
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debug: false
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};`
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}]
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}
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]
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});
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if (result2.error) {
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console.log(` ERROR: ${result2.error.message}`);
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allPassed = false;
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results.push({ name: 'Thinking after tool result', passed: false });
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} else {
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const thinking2 = result2.content.filter(b => b.type === 'thinking');
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const text2 = result2.content.filter(b => b.type === 'text');
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const toolUse2 = result2.content.filter(b => b.type === 'tool_use');
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console.log(` Thinking blocks: ${thinking2.length}`);
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console.log(` Text blocks: ${text2.length}`);
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console.log(` Tool use blocks: ${toolUse2.length}`);
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if (text2.length > 0) {
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console.log(` Response: "${text2[0].text?.substring(0, 80)}..."`);
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}
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// Should have thinking after receiving tool result
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const passed = thinking2.length >= 1 && (text2.length > 0 || toolUse2.length > 0);
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results.push({ name: 'Thinking after tool result', passed });
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if (!passed) allPassed = false;
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}
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} else {
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console.log(' SKIPPED - No tool use in previous test');
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results.push({ name: 'Thinking after tool result', passed: false, skipped: true });
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}
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// ===== Summary =====
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console.log('\n' + '='.repeat(60));
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console.log('SUMMARY');
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console.log('='.repeat(60));
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for (const result of results) {
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const status = result.skipped ? 'SKIP' : (result.passed ? 'PASS' : 'FAIL');
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console.log(` [${status}] ${result.name}`);
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}
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console.log('\n' + '='.repeat(60));
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console.log(`OVERALL: ${allPassed ? 'ALL TESTS PASSED' : 'SOME TESTS FAILED'}`);
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console.log('='.repeat(60));
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process.exit(allPassed ? 0 : 1);
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}
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runTests().catch(err => {
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console.error('Test failed with error:', err);
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process.exit(1);
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});
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