LangGraph Lab
Design the architecture. Pass the exam. Take the code.
Each project is a real request and the final exam of a track. You decide the architecture with no hints: the drawing shows what each choice does, not whether it is right. The tests stay hidden until you submit. At the end, the score compares your architecture with the ideal one, and you take the LangGraph code of what you designed.
- 1DecideOne question at a time, no hints. Hover an option and see the drawing change before you choose.
- 2SubmitThe test cases, hidden until now, travel through your flowchart node by node.
- 3Take the codeA score against the ideal architecture and the LangGraph code of what you built, ready to run.
Free, no sign-up, runs in the browser.
- Final exam of LLM foundations for engineers
Store support on WhatsApp
A bot that handles orders, billing and exchanges, and knows when to call a person.
StructureActionsManipulationEscalationMemoryStart - Final exam of Evals and reliability
Invoices into the ERP
Read supplier invoices and post them to the ERP without anyone typing.
ReadingFormatMathExceptionsStart - Final exam of RAG and context
Internal knowledge chat
A chat that answers company questions with the source, without leaking what it should not.
KnowledgePermissionsNo answerOpen wikiStart - Final exam of Building agents
Coding agent
An agent that takes the task, edits the repo, runs the tests and opens the PR for review.
StructureToolsCommandsBudgetDoneStart - Final exam of Securing AI systems
Finance assistant with approval
An assistant in the bank app that finds bills, proposes payments and schedules Pix without taking control of the money away from the customer.
EmailsPermissionsApprovalErrorsRecordStart - Final exam of Production: cost, latency, and operations
Deep research with citations
A system that investigates an open question across dozens of sources and delivers, in minutes, a report with a source for every sentence.
ExecutionModelsCacheProviderObservabilityStart
Next projects
- Automatic ticket triage
- Call center voice assistant
- Automated PR reviewer
- Test generator
- Legacy code migration
- On-call incident agent
- Spreadsheet analysis with code execution
- Natural language to SQL
- Automated sales SDR
- Legal assistant
- Resume screening with bias control
- Content moderation
- Conversational onboarding
- E-commerce semantic search
- Educational tutor
- Browser agent for repetitive tasks
- Content creation pipeline
- Health assistant with guardrails
- Back-office automation with durable execution
Independent project, not affiliated with LangChain. LangGraph is an open library by LangChain.