Yet another Hacker News

Show HN: Graphify C# – Compiler-accurate Find Usages for coding agents

13 points zachsaw 3 hours ago 8 comments

yodon 2 hours ago | parent

I don't understand why Microsoft and JetBrains aren't shipping versions of this. It seems like exactly what Roslyn was designed for

zachsaw 2 hours ago | parent

Exactly! I'd be more than happy to hand it over to Microsoft to continue maintaining it just to be clear. But MIT licensing it, hopefully the community will help keep it up to date with future C# versions too.

jayd16 1 hour ago | parent

JetBrains provides an MCP server such that agents can query the project index for things like find usages. What's different about this?

zachsaw 1 hour ago | parent

lol I actually didn't know that. This is MIT licensed though.

EDIT: I think the differentiation is that this isn't MCP based. Dumping a portable json file allows much more flexibility than just having to run Rider IDE in the background with the solution loaded and indexed. e.g. the graph works with jq, CI (gates), arbitrary agents without MCP support, non MCP tools, bulk questions etc.

gregoryl 1 hour ago | parent

I'm hoping Rider get some support for switching between worktrees efficiently - until then, it becomes a tool only the primary / interactive agent sessions can access.

CatsOwlsCatsOwl 1 hour ago | parent

(Microsoft) GitHub Copilot already builds a semantic index of your solution in a cloud cache, which is used to give higher code intelligence than what you can get from Claude Code alone or LLM interfaces which don't have native support for the Roslyn API like GitHub Copilot does.

GitHub Copilot's semantic index can work for any SaaS repo provider (GitLab, Bitbucket, etc.) or any local repos but this requires you to opt into the feature. Repos hosted in GitHub and Azure DevOps do NOT require opting into it since Microsoft already has your code.

JFuzz 34 minutes ago | parent

Hey man, just wanted to say thanks! I pulled this down and adapted the skill for Unity development, keeping Graphify C# as an external analysis tool. My adapted skill isn’t publicly available yet, and I'm going to add it into my standard Unity Package development workflow to see if I can find some additional value in how the CLI and structured JSON make semantic information accessible to coding agents. I think this will help (maybe not on a full Unity game) but if you'r building multiple Unity Packages or have existing Unity Packages. Appreciate you sharing this!

spicyusername 13 minutes ago | parent

Love to see C# love. It's a great language. Super underrated in my opinion.

Unions coming in .NET 11 / C# 15 are going to be great.