Reticle lets coding agents prove a change works inside your running app, and won't round "couldn't tell" up to a pass
A dev-only SDK, stripped from production builds, instruments your running web, Electron, or Tauri app's DOM, network, routing, console, and state (Redux, Zustand, TanStack Query, Pinia) and exposes it over MCP, so Claude Code, Cursor, Codex, or Copilot can act and get back a yes, no, or unknown verdict with the evidence and the file:line to fix. It runs over a localhost-only bridge, needs Node 20.11+, starts with npx @reticlehq/server init (not npx reticle, which is someone else's package), and sends anonymous usage counts unless you opt out (Show HN).