Show HN: Mdarena – Benchmark your Claude.md against your own PRs

Re:Show HN: Mdarena – Benchmark your Claude.md against your ... by hudsongr on Sunday April 05, 2026 @07:39PM (#47655107)

Hey! I built this because everyone's writing CLAUDE.md files now but nobody knows if theirs actually works. The research is contradictory too, one paper says they hurt performance, another says they help. So I made a tool that just measures it on your own repo using your own PRs and your own test suite.

Turns out it's not often you can point to a single markdown file and say "this made the agent 27% better at resolving real tasks." That's what we saw on our production monorepo. I imagine this as a way for teams to actually make their agents write better code instead of guessing.

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Re:Show HN: Mdarena – Benchmark your Claude.md against your ... by aszen on Monday April 06, 2026 @05:03AM (#47658484)

This is quite interesting, will try it. I kind of expect this to be done continuously as the code base changes.

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Re:Show HN: Mdarena – Benchmark your Claude.md against your ... by Powdering7082 on Monday April 06, 2026 @11:45AM (#47662415)

So by default it pulls out recent PRs, grabs only the tests that were commited and then checks to see how well an agent with different claude.mds can finish the test suite?

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