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Which tools do Claude, Codex and Cursor choose? We measured 17k runs to find out

https://armature.tech/blog/which-tools-coding-agents-install
21•screm•56m ago

Comments

screm•54m ago
Hey!

Disclaimer: I am a Co-Founder of Armature (YC P26) which sells growth services to dev tools. This study is part of our broader work on how to influence coding agents choices and get products picked.

To understand how agents pick tools we measured close to 17k sessions on an environment where agents run exactly like in the real world, on various repositories, talking to different personas (vibe-coder, junior or senior engineers) in different sizes of companies.

All the results are now public and we'd love to know what findings surprise you the most, here are a few we found interesting: - Claude Code rarely searches the web while Codex almost always does it and Cursor sits in the middle. - Coding agents disagree more frequently than they agree. - Some players (LangChain, Supabase, Netlify, Paypal, Adyen) are almost always mentioned in their categories but never chosen. - Modifying repository context can change the pick entirely.

If you feel like digging, all the traces are there and we probably missed interesting learnings so let us know what you find!

Distributed PyTorch Profiling

https://zhenyu.github.io/2026/09/02/why-a-gpu-profiling-capture-turned-into-a-distributed-systems...
1•asaiacai•44s ago•0 comments

Performance Characterization of SPEC CPU 2026 on AMD EPYC 9755 "Zen 5" Processor

https://arxiv.org/abs/2609.01527
1•matt_d•1m ago•0 comments

Google DeepMind Just Rolled Out Its Most Accurate AI Global Weather Model

https://gizmodo.com/google-deepmind-just-rolled-out-its-most-accurate-ai-global-weather-model-200...
1•Aboutplants•2m ago•0 comments

Who is using FPGA for ML inference?

1•softwarewright•2m ago•0 comments

Ask HN: iPhone Camera on indicator.

1•zahirbmirza•5m ago•0 comments

These websites Have Been Seized

https://seized.fyi/
1•Cider9986•6m ago•0 comments

NVIDIA's Acquisition of HuggingFace was for $HuggingFace

1•MontagFTB•8m ago•0 comments

Ukrainian Sea Drones Strike Russian Black Sea Resort Town of Sochi

https://www.twz.com/news-features/ukrainian-sea-drones-strike-russian-black-sea-resort-town-of-so...
1•cisc•8m ago•0 comments

Dependent if expressions without dependent types

https://haskellforall.com/2026/09/dependent-if-expressions
1•birdculture•9m ago•0 comments

Rusty state of USS Abraham Lincoln after marathon deployment shocks observers

https://www.cnn.com/2026/09/03/asia/aircraft-carrier-abraham-lincoln-rust-intl-hnk-ml
1•cisc•9m ago•0 comments

Flock Is Cancelled–and Their Competitors Are Profiting

https://www.motherjones.com/politics/2026/09/flock-contracts-cancelled-cameras-alpr-rekor-axon-fl...
2•cdrnsf•10m ago•0 comments

Hosting Valkey: one MicroVM per store, durable by default

https://mojave.sh/blog/valkey-in-a-microvm
2•stwrt•10m ago•0 comments

GPT 6 is way behind Anthropic on Artificial Analysis

https://artificialanalysis.ai/models/gpt-6-astra
2•pranshuchittora•11m ago•0 comments

The Selfish AI Model

https://ateliti99.substack.com/p/the-selfish-ai-model
1•olirex99•12m ago•0 comments

Jsonquery_GUI – A native Rust/egui desktop tool for streaming jq queries

https://github.com/nujufas/jsonquery_gui
1•nujufas•12m ago•0 comments

AWS STS

1•fotta•15m ago•0 comments

Four major AI models suffer rare overlapping downtime

https://arstechnica.com/ai/2026/09/four-major-ai-models-suffer-rare-overlapping-downtime/
2•SockThief•17m ago•0 comments

New weight loss and diabetes treatment helps burn fat while keeping muscle

https://news.berkeley.edu/2026/08/21/a-promising-new-weight-loss-and-diabetes-treatment-helps-bur...
5•gmays•18m ago•0 comments

Parity Problem

https://en.wikipedia.org/wiki/Parity_problem
1•binyu•19m ago•0 comments

Show HN: We replaced the pelican benchmark with a hippo

https://hippo.ryansailab.com
2•codemax98•19m ago•2 comments

Have we finally found dark matter?

https://www.scientificamerican.com/article/have-we-finally-found-dark-matter/
3•bookofjoe•19m ago•1 comments

Show HN: DrawDB Pro – design database schemas for your team and agents

https://www.drawdb.app/
3•1ilit•20m ago•0 comments

Ask HN: Is there a test for measuring cognitive affects from LLM usage?

1•niwrad•20m ago•0 comments

CERN moves accelerator control computers to Debian

https://www.theregister.com/os-platforms/2026/09/03/cern-moves-thousands-of-accelerator-control-c...
1•joebuckwilliams•21m ago•0 comments

Mullvad migrating to Q9 for encrypted DNS

https://mullvad.net/en/blog/shutting-down-our-public-encrypted-dns-servers-and-sponsoring-quad9-i...
3•matrix8967•22m ago•1 comments

Court Rules Against Citizen Journalists in DMCA Takedown Case–EFF Will Appeal

https://www.eff.org/deeplinks/2026/09/court-rules-against-citizen-journalists-dmca-takedown-case-...
2•hn_acker•23m ago•0 comments

I built an AI development environment that runs and builds software on Android

https://github.com/sedds89/StitchLabtools
1•sedds89•25m ago•0 comments

I used AI to connect with 30 people at a conference

https://galvered.com/blog/ai4-conference/
1•Bootstrapper909•26m ago•0 comments

Both recent GCP outages caused by fiber optic maintenance

2•fastest963•30m ago•0 comments

GitHub dipped 7%, while both AI labs were down

https://claude.ai/public/artifacts/2368658e-60f2-4f51-8883-8d72738ba7ce
4•Topfi•31m ago•1 comments