LlamaIndex ‘legal-kb’: Agentic Retrieval over Index v2 with retrieve, find, read, and grep Tools

LlamaIndex has published legal-kb , a public reference application on GitHub. It is described as a knowledge base for legal documents, powered by LlamaIndex Index v2 (the LlamaParse Platform). The project demonstrates a pattern the team calls a Retrieval Harness for agentic retrieval.

The approach differs from single-shot retrieval. Instead of one embedding search per query, an agent is given filesystem-style tools. It can then crawl a large, evolving knowledge base to solve a task. The tools mirror operations engineers already know: semantic and keyword search, regex grep, file search, and read.

legal-kb is a working TanStack Start web app, not a library. You sign in, create a project, upload files, and chat with an agent. Each project is mirrored as a managed LlamaCloud Index v2. Uploaded files are parsed and indexed automatically in the background. The chat agent then queries that index live during each turn.

The harness provides a persistent data pipeline over your documents. It connects to a data source, indexes it, and keeps it updated. On top of that pipeline, it exposes a set of tools to the agent.

Those tools are deliberately close to filesystem operations. An agent can list files, read a file, grep inside a file, or run hybrid search. Because the tools are generic, you can plug the harness into your own agents.

The agent in src/lib/agent.ts is given four tools. Each maps to an Index v2 retrieval API. The table below lists them as implemented.

The system prompt enforces an order. The agent must call findFiles first to establish the document inventory. It then narrows with retrieve , and confirms exact wording with readFile or grepFile before citing.

Uploads follow a clear pipeline in src/lib/files.ts . Bytes are pushed to the project’s LlamaCloud source directory. A File and ProjectFile row are written to PostgreSQL via Prisma. An index sync is triggered but not awaited; the UI polls status until ready.

Versioning is scoped to the (project, filename) pair. Re-uploading nda.pdf to the same project produces v1, v2, v3 side by side. The retrieval layer filters on the version metadata field. This gives version control over the knowledge base itself.

The agent uses the ToolLoopAgent from Vercel AI SDK 6. You pick OpenAI or Anthropic per turn and bring your own keys. Reasoning is streamed: Claude models use extended thinking; OpenAI reasoning models use a medium reasoning effort.

Here is a condensed but faithful view of the retrieve tool and the agent.