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Badri Narayanan S
272
tests/test-thinking-signatures.cjs
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272
tests/test-thinking-signatures.cjs
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/**
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* Thinking Signature Test
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*
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* Tests that thinking blocks with signatures are properly handled in multi-turn
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* conversations, simulating how Claude Code sends requests.
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*
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* Claude Code sends assistant messages with thinking blocks that include signatures.
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* These signatures must be preserved and sent back to the API.
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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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// Parse SSE events
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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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// Build content from events
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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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resolve({ content, events, statusCode: res.statusCode, raw: fullData });
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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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const tools = [{
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name: 'get_weather',
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description: 'Get the current weather for a location',
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input_schema: {
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type: 'object',
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properties: {
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location: { type: 'string', description: 'City name' }
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},
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required: ['location']
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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('THINKING SIGNATURE TEST');
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console.log('Simulates Claude Code multi-turn with thinking blocks');
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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: First turn - get thinking block with signature =====
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console.log('TEST 1: Initial request with thinking model');
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console.log('-'.repeat(40));
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const turn1Messages = [
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{ role: 'user', content: 'What is the weather in Paris? Use the get_weather tool.' }
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];
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const turn1Result = await streamRequest({
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model: 'claude-sonnet-4-5-thinking',
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max_tokens: 4096,
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stream: true,
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tools,
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thinking: { type: 'enabled', budget_tokens: 10000 },
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messages: turn1Messages
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});
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const turn1Thinking = turn1Result.content.filter(b => b.type === 'thinking');
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const turn1ToolUse = turn1Result.content.filter(b => b.type === 'tool_use');
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const turn1Text = turn1Result.content.filter(b => b.type === 'text');
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console.log(` Thinking blocks: ${turn1Thinking.length}`);
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console.log(` Tool use blocks: ${turn1ToolUse.length}`);
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console.log(` Text blocks: ${turn1Text.length}`);
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// Check thinking has signature
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let turn1HasSignature = false;
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if (turn1Thinking.length > 0) {
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const sig = turn1Thinking[0].signature || '';
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turn1HasSignature = sig.length >= 50;
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console.log(` Signature length: ${sig.length} chars`);
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console.log(` Signature present: ${turn1HasSignature ? 'YES' : 'NO'}`);
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if (turn1Thinking[0].thinking) {
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console.log(` Thinking preview: "${turn1Thinking[0].thinking.substring(0, 80)}..."`);
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}
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}
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const test1Pass = turn1Thinking.length > 0 && turn1HasSignature && turn1ToolUse.length > 0;
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results.push({ name: 'Turn 1: Thinking + Signature + Tool Use', passed: test1Pass });
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console.log(` Result: ${test1Pass ? 'PASS' : 'FAIL'}`);
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if (!test1Pass) allPassed = false;
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// ===== TEST 2: Second turn - send back thinking with signature =====
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console.log('\nTEST 2: Multi-turn with thinking signature in assistant message');
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console.log('-'.repeat(40));
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if (!turn1ToolUse.length) {
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console.log(' SKIPPED - No tool use in turn 1');
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results.push({ name: 'Turn 2: Multi-turn with signature', passed: false, skipped: true });
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} else {
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// Build assistant message with thinking (including signature) - this is how Claude Code sends it
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const assistantContent = turn1Result.content;
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// Verify the thinking block has signature before sending
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const thinkingInAssistant = assistantContent.find(b => b.type === 'thinking');
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if (thinkingInAssistant) {
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console.log(` Sending thinking with signature: ${(thinkingInAssistant.signature || '').length} chars`);
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}
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const turn2Messages = [
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...turn1Messages,
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{ role: 'assistant', content: assistantContent },
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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: turn1ToolUse[0].id,
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content: 'The weather in Paris is 18°C and sunny.'
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}]
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}
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];
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const turn2Result = await streamRequest({
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model: 'claude-sonnet-4-5-thinking',
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max_tokens: 4096,
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stream: true,
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tools,
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thinking: { type: 'enabled', budget_tokens: 10000 },
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messages: turn2Messages
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});
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const turn2Thinking = turn2Result.content.filter(b => b.type === 'thinking');
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const turn2Text = turn2Result.content.filter(b => b.type === 'text');
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console.log(` Thinking blocks: ${turn2Thinking.length}`);
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console.log(` Text blocks: ${turn2Text.length}`);
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// Check for errors
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const hasError = turn2Result.events.some(e => e.type === 'error');
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if (hasError) {
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const errorEvent = turn2Result.events.find(e => e.type === 'error');
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console.log(` ERROR: ${errorEvent?.data?.error?.message || 'Unknown error'}`);
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}
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if (turn2Thinking.length > 0) {
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const sig = turn2Thinking[0].signature || '';
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console.log(` New signature length: ${sig.length} chars`);
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if (turn2Thinking[0].thinking) {
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console.log(` Thinking preview: "${turn2Thinking[0].thinking.substring(0, 80)}..."`);
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}
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}
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if (turn2Text.length > 0 && turn2Text[0].text) {
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console.log(` Response: "${turn2Text[0].text.substring(0, 100)}..."`);
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}
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const test2Pass = !hasError && (turn2Thinking.length > 0 || turn2Text.length > 0);
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results.push({ name: 'Turn 2: Multi-turn with signature', passed: test2Pass });
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console.log(` Result: ${test2Pass ? 'PASS' : 'FAIL'}`);
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if (!test2Pass) allPassed = false;
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}
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// ===== TEST 3: Verify signature_delta events in stream =====
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console.log('\nTEST 3: Verify signature_delta events in stream');
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console.log('-'.repeat(40));
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const signatureDeltas = turn1Result.events.filter(
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e => e.type === 'content_block_delta' && e.data?.delta?.type === 'signature_delta'
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);
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console.log(` signature_delta events: ${signatureDeltas.length}`);
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if (signatureDeltas.length > 0) {
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const totalSigLength = signatureDeltas.reduce((sum, e) => sum + (e.data.delta.signature?.length || 0), 0);
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console.log(` Total signature length from deltas: ${totalSigLength} chars`);
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}
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const test3Pass = signatureDeltas.length > 0;
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results.push({ name: 'signature_delta events present', passed: test3Pass });
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console.log(` Result: ${test3Pass ? 'PASS' : 'FAIL'}`);
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if (!test3Pass) allPassed = false;
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// ===== Summary =====
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console.log('\n' + '='.repeat(60));
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console.log('SUMMARY');
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console.log('='.repeat(60));
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for (const result of results) {
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const status = result.skipped ? 'SKIP' : (result.passed ? 'PASS' : 'FAIL');
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console.log(` [${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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