When a developer asks Claude Code, Codex, OpenCode or Pi to add auth, payments or email, the agent picks the tool. DevTune shows what they install and why, drafts the fixes, and re-tests to show what moved.
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Which auth, payments and email tools Claude Code, Codex, OpenCode and Pi install, tested in real Next.js, Express and Rails projects and re-tested on every major model release.
Developers ask Claude Code, Codex, OpenCode or Pi to add auth, payments or email. The agent reads your docs, fetches your quickstart, and installs whatever looks easiest.
Add auth to this app
Today
Built its ownAfter the fix ships
Installed youAdd auth to this API
Today
Installed another toolAfter the fix ships
Installed youSend a welcome email on sign-up
Today
No provider chosenAfter the fix ships
Installed youAdd auth to this app· 8 runs
+ app/lib/session.tsBuilt its ownnpm install next-authInstalled another tool+ src/middleware/session.tsBuilt its ownnpm install passportInstalled another toolbin/rails generate authenticationBuilt its ownbin/rails generate authenticationBuilt its own
npm install your-sdkInstalled you
+ src/auth/jwt.tsBuilt its ownThe same requests run against each coding agent in real projects, on every major model release. When an agent switches to you, or away from you, you see it beside the fixes you shipped.
Which tool each agent installs, by framework and kind of request.
18% install rate · 212 runs
What the agent searched, read and ran, and the moment it decided.
41 losses · 9 reasons
Each reason it chose someone else, turned into a fix with the evidence attached.
5 open actions · 3 drafts
The next test shows whether agents switched, with a likely range.
2 improved · 1 re-testing
Ask an agent to explain why Codex stopped installing you, rewrite the quickstart it keeps misreading, fix the docs page it hit a 404 on, or send the weekly picks. They work in Slack too. Every draft waits for your approval, and your own agents read the same runs over API and MCP.
works in Slack · drafts you approve · MCP + APIAn install rate on its own is a score. With the run behind it, you can see the search the agent made, the page it misread, and the command that failed, and fix the actual cause.
sandbox transcript
logged requests · 404s
package files
code changes
A better install rate in tests is the start. DevTune re-tests what each fix touched and puts the result beside what happens in production: agents requesting your docs, and the sign-ups or CLI logins you already track. Available in the app, through the API, and via MCP.
When you ship a fix, DevTune re-runs only the frameworks and requests it was meant to change, and stops as soon as the result is clear. Results shows how the install rate moved, with a likely range.
Requests from AI agents to your site, seen first-party at the edge, including pages they ask for that don't exist. Those 404s become fixes in Actions.
The events you choose, such as sign-ups, CLI logins or first API calls, counted before and after each fix ships. Results shows them next to the test that predicted them.
You win Express when developers ask for a recommendation, and lose every hosted-service request on Next.js.
| Framework · installed youFramework | Build itBuild | Recommend oneRecommend | Hosted serviceHosted |
|---|---|---|---|
| Next.js 16Next.js | 5%lost toBuilt its own | 15%lost toClerk | 0%lost toClerk |
| TanStack StartTanStack | 10%lost toBuilt its own | 25%lost toBetter Auth | 10%lost toSupabase Auth |
| SvelteKitSvelteKit | 0%lost toBuilt its own | 15%lost toBetter Auth | 15%lost toSupabase Auth |
| ExpressExpress | 5%lost toPassport | 45%you lead | 20%lost toAuth0 |
| FastAPIFastAPI | 0%lost toBuilt its own | 10%lost toAuth0 | 15%lost toAuth0 |
Every plan includes credits for tests and re-tests each month. You see an estimate before every test, credits cover only what the runs use, and failed runs are refunded.
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Claude Code
Codex
OpenCode
Pi
