An agent can write the code. It cannot tell you whether the code works — reading a diff proves nothing, unit tests don't run the app, and a screenshot can't see a silent 500. So agents say "done" over broken software, and you find out by opening the app.
We're closing that gap: giving agents runtime perception of a real running application — the network calls, the store, the console, the routes, the DOM — and a verdict they can act on. Pass, fail, or "couldn't tell", with the file:line to fix.
reticle.sh · Docs · Discord · Main repo →
Everything else that checks a web app looks at it from the outside — pixels, DOM, a vision model guessing at a screenshot. Reticle looks at the program: app state, framework signals, request cardinality, swallowed errors. That's the bug class an outside-in tool structurally cannot catch, and it's where AI-written code actually fails.
A dev-only SDK runs inside your app. A local bridge exposes it to your agent over MCP. The agent drives the real app, reads what actually happened, and fixes it before you ever see it.
No screenshots. No vision model. No test syntax. Runs on your machine, on localhost, and your app data never leaves it.
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The whole thing — browser SDK, MCP server, CLI, framework adapters, spec runner. Apache-2.0.
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Getting started, the tool surface, token efficiency — and
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Works with Claude Code, Cursor, Copilot, Codex, Windsurf, OpenCode, and any MCP agent. React, Vue, Svelte, Preact, Astro, plain HTML · Next.js · Electron & Tauri · macOS, Linux, Windows.
/plugin marketplace add reticlehq/reticle # Claude Code
npx skills add reticlehq/reticle # everywhere else
- Verification the agent can't fake. A green verdict never rests on evidence Reticle doesn't have. Every false-green we find gets fixed and pinned with a regression guard — that invariant outranks every feature.
- Diagnosis, not just detection. First divergence, blast radius, and the exact
file:line— because the win we measure is fewer agent tool-calls to a fix, not a longer bug list. - Zero-install on-ramp. Drive an app with no SDK wired at all, and earn the deeper read.
- Beyond the browser. React Native, native Android, iOS — being explored honestly, and not promised until an agent can drive a real app there and get a verdict.
The core verification engine is free forever. Full direction lives in the Roadmap.
The work happens in the open — what's being built this cycle, what's up for grabs, and design calls before they land.
💬 Join the Discord → · Good first issues · Contributing
dev-only · localhost-only · your app data stays local · Apache-2.0