GraphRAG for Legal Document Understanding For Case Preparation: Is It Right for You?

👎Considerations

• ⚠Indexing cost is high: building the graph requires many LLM calls per document (entity extraction, claim extraction, community summarization), which can become expensive on large corpora.
• ⚠Initial setup has a steeper learning curve than vector RAG — you must understand entity extraction prompts, community levels, and the local/global/DRIFT trade-offs to get good results.
• ⚠Updating the index incrementally is harder than with a vector store; re-indexing or running the incremental update pipeline is non-trivial for fast-changing data.
• ⚠Quality of the resulting graph depends heavily on the underlying LLM and on prompt tuning for the source domain — out-of-the-box extraction can miss domain-specific entity types.
• ⚠Positioned as a research/reference pipeline rather than a turnkey product, so production concerns (auth, multi-tenancy, observability, scaling) are left to the integrator.