Show HN: Lain, a structural code graph and agent coordinator for coding agents

Category: devtools

Tags: code-analysis, mcp, agent-coordination, static-analysis, graph

Score: 7.5/10 (Innovation: 7, Technical: 8, Documentation: 8, Utility: 7)

Lain builds a structural code graph (callers, dependencies, symbols, Git co-changes) from multiple languages and exposes it via MCP for coding agents. It enables agents to query blast radius, call chains, and symbol relationships, and coordinates multiple agents with presence and claims. It's an innovative combination of static analysis, graph indexing, and agent coordination.

Target audience: backend devs, ai engineers, devops

Repository: https://github.com/spuentesp/lain · Rust · MIT · 9 stars

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