Check the health of the React Native development environment: detected OS, iOS/Android toolchains, Metro status and project info. Call this first when something is failing or before device/build operations.

List debuggable React Native runtimes exposed by Metro. Call when a runtime tool reports TARGET_AMBIGUOUS or to check what is connectable. Requires Metro running.

Read console logs from the running React Native app (buffered since the runtime bridge connected). Cursor-based: pass the previous nextCursor to read only new entries. Requires Metro running.

Execute a JavaScript expression inside the running React Native app and return the result. Use to inspect state (Redux/Zustand stores, globals) or trigger behavior. Promises are awaited via polling (Hermes limitation), up to timeoutMs. This can mutate app state — prefer read-only expressions when verifying. Requires Metro running.

Trigger a full JS reload of the running React Native app (same as pressing 'r' in the Metro terminal). Requires Metro running.

Start a native build (Gradle) in the background and return a job id immediately. Poll with get_build_status. Use after native-layer changes; for pure JS changes prefer reload_app.

Check a build job started by run_build. Long-polls up to waitSeconds (default 25) so you can wait efficiently; on completion returns structured diagnostics with probable causes and suggested fixes.

Cancel a running build job (kills the whole process tree).

Parse a native build log (xcodebuild, Gradle, CocoaPods, Metro) into structured diagnostics with probable causes and suggested fixes. Use on logs from terminals, CI, or a logPath from get_build_status.