C/C++ source code graph RAG based on Clang/clangd

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Graph RAG for C/C++ Development 1. Overview This project enables deep code analysis with Large Language Models. By constructing a Neo4j-based Graph RAG, it enables developers and AI agents to perform complex, multi-layered queries on C/C++ codebases that traditional search tools simply can't handle. With only 4 MCP APIs and a vanilla agent, it is already able to accomplish lots of tasks related to the codebases. 2. How it works Using clangd and clang, the system parses and indices your source files to create a high-fidelity code graph. It captures everything from high-level folder structures to granular relationships, including entities like Folders, Files, Namespaces, Classes/Structs, Variables, Methods, etc.; relationships like: CALLS, INCLUDES, INHERITS, OVERRIDES, and more. The system generates summaries and embeddings for every level of the codebase (from functions up to entire folders) using a bottom-up approach. This structured context helps AI agents understand the "big picture" without getting lost in the syntax. To get you started easily, the project includes: an example MCP (Model Context Protocol) server, and a demonstration AI agent to showcase the graph’s power. You can easily build your own custom agents and servers on top of the graph RAG. 3. Efficiency & Performance Incremental Updates: The system detects changes between commits and updates only what’s necessary. Parallel Processing: Parsing and summary generation are distributed across worker processes with optimized data sharing. Smart Caching: Results are cached to minimize redundant computations, saving you both time and LLM costs. 4. A benchmark: The Linux Kernel When building a code graph for the Linux kernel (WSL2 release) on a workstation (12 cores, 64GB RAM), it takes about ~4 hours using 10 parallel worker processes, with peak memory usage at ~36GB. Note this process does not include the summary generation, and the total time may vary based on your LLM provider.

Visit product View on Hacker NewsDec 30, 2025

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Indie HackersFits the IH revenue-focused audience · Strong signals: started, para, including · Missing: supports, reddit linkedin, podcasting

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Hacker NewsStrong engagement from HN community · Strong signals: ide, io, including · Missing: https docs, excited, just released

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AppSumoMay struggle as an AppSumo deal · Strong signals: calls · Missing: plus, platform, intuitive

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Acquire.comPre-revenue stage for this audience · Missing: arr, mrr, revenue

15%15% predicted probability of success on Acquire.com, based on ML models trained on real launch data.

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