langchain-debug-bundle

# LangChain Debug Bundle ## Current State !`node --version 2>/dev/null || echo 'N/A'` !`python3 --version 2>/dev/null || echo 'N/A'` ## Overview Collect comprehensive diagnostic information for LangChain issues: environment info, dependency versions, chain execution traces, and minimal reproduction scripts. ## Step 1: Environment Snapshot ```typescript import { execSync } from "child_process"; import * as fs from "fs"; function collectEnvironment() { const env: Record<string, string> = {}; env.nodeVersion = process.version; env.platform = `${process.platform} ${process.arch}`; // Get @langchain/* versions try { const pkg = JSON.parse(fs.readFileSync("package.json", "utf-8")); const deps = { ...pkg.dependencies, ...pkg.devDependencies }; for (const [name, version] of Object.entries(deps)) { if (name.startsWith("@langchain") || name === "langchain") { env[name] = version as string; } } } catch {} // Check env vars (redacted) env.OPENAI_API_KEY = process.env.OPENAI_API_KEY ? "set (redacted)" : "NOT SET"; env.ANTHROPIC_API_KEY = process.env.ANTHROPIC_API_KEY ? "set (redacted)" : "NOT SET"; env.LANGSMITH_TRACING = process.env.LANGSMITH_TRACING ?? "NOT SET"; return env; } ``` ## Step 2: Trace Callback for Evidence Collection ```typescript import { BaseCallbackHandler } from "@langchain/core/callbacks/base"; interface TraceEvent { timestamp: string; event: string; data: Record<string, any>; } class DebugT...