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Langgraph Harness
Langgraph Harness is a self-hosted AI coding agent platform for GitLab that reviews merge requests, resolves work items, and chats with full project context.
Langgraph Harness is a self-hosted AI coding agent platform built specifically for GitLab using LangGraph. It automates merge request reviews, resolves issues and tasks inside isolated Kata Containers VMs, and provides an interactive project-aware chat assistant. The platform uses a multi-provider LLM backend supporting OpenRouter, Gemini, Groq, Ollama, and sglang, alongside a React admin UI and BullMQ queue backend. It features persistent checkpoints so interrupted runs resume instead of restarting, along with safety checks for tool calls and comments. It is designed for development teams using GitLab who want automated code reviews and task execution with strict sandbox isolation.
Langgraph Harness at a glance
Key features
- Automatic merge request reviews via webhook events
- Autonomous work item resolution inside isolated Kata Containers VMs
- Interactive GitLab-aware chat assistant with real tool access
- Persistent checkpoints for resuming interrupted runs
- Explicit human approval for sensitive tool calls
- Durable project-scoped memory across reviews
- Recurring scheduled tasks from free-text instructions
Use it for
- Reviewing merge requests automatically upon webhook trigger
- Resolving GitLab issues by running code changes in a secure sandbox
- Chatting with an assistant that has direct access to GitLab data
- Executing recurring scheduled tasks via natural language instructions
Companions
Tools that articles about Langgraph Harness recommend using with it, each with its job.
- LangGraph — Durable execution, checkpoints and human approval under create_agent.
- LangSmith — Step-by-step traces and evals that show what an agent actually did
- Pinecone — Managed retrieval for the fastest path to production.
- Qdrant — Self-hosted vectors when cost or data residency matter.
- Ollama — Fully self-hosted inference paired with Qdrant.
- Langfuse — Self-hostable alternative to LangSmith.
Alternatives to Langgraph Harness
- LangChain — Compose exactly the agent your use case needs from model, tools, prompt, and middleware.
- DeepSeek Harness — Builds on a plugin architecture to organize documents, analyze tables, and write code.
- HarnessRouter — One API to manage agent runtimes, sandboxes, and execution lifecycles.
- CodeGraph — It eliminates file crawling, reducing AI agent tool calls by 88% and cutting costs.
- Tetriz Harness — Audit, improve, and roll out AI coding agent rules and tools across developer teams.
- Better Harness — Gathers project evidence and turns concrete gaps into prioritized findings.
- Harness Meta-Skill — Generates specialized agent teams and skills for Claude Code from a single prompt.
- Harness Manager — Manages your entire AI coding stack in one native Mac app.
- LongHorizon Harness — Maintains durable task state and executes reliable, verifiable workflows over many hours.
- ZCode — Integrates GLM-5.3 with multi-agent workflows and remote chat control.
- Durable Harness — Recovers sessions from logs after crashes and prevents duplicate tool calls.
- Claude Code Harness — Enforces a disciplined delivery loop with verification gates and safety checks.
All Langgraph Harness alternatives