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How to find which code writes a field that goes wrong with Debroid

Watch a field for access and modification, then read the stack at each change.

Authorization notice. Debroid is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Who it is forA developer or agent tracking a field whose value changes unexpectedly during a user flow.

The problemSearching the codebase for every write to a field is slow, and the actual writer often depends on runtime order.

The outcomeThe agent gets a list of the code locations that touched the field during the flow, with stack traces, and can name the writer.

What you need first

  • Java JDK 11+ with JAVA_HOME set
  • Android SDK with adb in your PATH
  • An Android app you can build and run, with debugging enabled
  • A terminal where an AI agent can run commands

Steps

  1. Install the CLI with curl -fsSL https://raw.githubusercontent.com/PatilShreyas/debroid/main/install.sh | bash
  2. Set a field watchpoint with debroid watch (access and modify are both on by default)
  3. Run the user flow in the app, then collect events with debroid poll --with-stacktrace (inferred, check the README)
  4. Check the active points with debroid points
  5. Remove the watchpoint with debroid remove-watch when finished

Prompt for your agent

Use the Debroid CLI to watch the field <field-name> in <class-name> of the app <package-name>. Run <user-flow> and then run `debroid poll --with-stacktrace`. Return each access or modification with its stack trace as JSON, and verify that the watched field name matches the one you set with `debroid points`.

Caveat. The README does not say how the watch command identifies a field beyond its signature, so confirm the field is picked up with `debroid points` before relying on the results.

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