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Android Debugger

Give Claude a real Android debugger so it can investigate bugs instead of guessing at them.

---

Stop letting your AI flail at Log.d.

Your AI agent hits a bug. It reads the stack trace. It reads the source. It guesses. It adds Log.d. It rebuilds. It runs the app. It reads more logs. It guesses again. Half its "fixes" are made-up field names. The other half pass tests that don't actually exercise the failure path.

That's not debugging. That's the agent doing improv from memory of your codebase.

Android Debugger attaches Claude to your running Android app the same way Android Studio does — JDI over JDWP, plus a native JVMTI agent for the things JDWP can't do. Claude sets real breakpoints. It reads real variables off a real paused VM. It evaluates expressions inside a grammar that literally cannot mutate state. It patches method bodies live via HotSwap. It walks the heap in native code, not by re-reading the source.

You ask. Claude attaches. The VM answers. The agent reports.

┌─────────┐   ┌─────────┐   ┌─────────┐   ┌─────────┐   ┌─────────┐
│  IDEA   │──►│ ATTACH  │──►│ OBSERVE │──►│  PATCH  │──►│ REPORT  │
│         │   │         │   │         │   │ (live)  │   │         │
│  you    │   │  auto   │   │  auto   │   │  auto   │   │  you    │
│  ask    │   │         │   │         │   │         │   │ approve │
└─────────┘   └─────────┘   └─────────┘   └─────────┘   └─────────┘
:investigate   :attach     :explain      :patch         (verdict)

Breakpoints, conditional breaks, logpoint sweeps, frame snapshots, FEEL expression eval, method invocation, HotSwap, heap walks, allocation tracing, session persistence — all driven by /android-debugger:* skills. No IDE. No browser tabs. No rebuilds for tracing. Just Claude and a live VM.

Why Android Debugger

Without Android Debugger Agent guesses field names from training data "Add a Log.d and rebuild" is the only instrumentation pattern Tests pass; the bug ships anyway Every fix requires a full Gradle build Stack traces are the entire signal — locals and watches don't exist Memory leaks: shrug, "looks fine in the source" Race conditions: "probably synchronized somewhere" Heap walks: humans only, via Android Studio's profiler Crash-and-fix loops with no understanding of why

With Android Debugger Agent reads real locals off the paused frame Logpoint sweeps trace 8 sites at once, no rebuild Acceptance verified by re-reading the patched VM, not by passing-tests-passing HotSwap method bodies in milliseconds — no Gradle round-trip Snapshots bundle frame + locals + watches + source into one cached payload Heap walks at native speed via JVMTI — count, find referrers, trace chains to GC roots Method + allocation traces with arg + return-value capture, line-rate Session persistence — breakpoints survive detach Explain-first, fix-second — hypothesis precedes mutation, always

The gap this closes

Every "AI debugger" today is a chat window staring at log output. Real debugging means pausing a VM, reading its state, forming a hypothesis, and proving it. That requires JDI, JVMTI, and a tool surface tuned for an agent's reading level — not a human's.

Android Debugger closes that gap with three structural commitments:

• Anti-hallucination by grammar. The evaluate tool runs DMN-FEEL expressions over paused-frame state. FEEL has no method-call syntax, so it cannot mutate. Mutation goes through a separate, flagged tool that refuses likely-mutators unless opted in. The agent cannot accidentally change the app while inspecting it.
• Snapshot-first, drill-down second. On every pause, the server eagerly bundles the top N frames + locals + watches + source ref into a frame_snapshot, cached by (thread, vmStateVersion). The token-burning "re-read every frame after every step" anti-pattern is dead.
• Explain before fix. The flagship workflow is :explain — snapshot the pause, state a one-paragraph hypothesis, then decide whether to step, trace, or patch. Published research (AutoSD-style scientific debugging) puts this loop at ~71% Pass@1 on real failures.

The agent stops guessing. It starts proving.

---

Install

Distributed through the Acendas marketplace. Two steps: add the marketplace, then install the plugin.

From inside a Claude Code session:

/plugin marketplace add Acendas/acendas-marketplace
/plugin install android-debugger@acendas

Or from the CLI:

claude plugin marketplace add Acendas/acendas-marketplace
claude plugin install android-debugger@acendas

The marketplace pins to a released version tag — every install is deterministic. To pick up a new release, run /plugin marketplace update then /plugin install android-debugger@acendas again.

Quick start

/android-debugger:ad-setup        # one-time env probe — JDK + adb + ART capabilities
/android-debugger:ad-attach       # pick a debuggable PID and connect
/android-debugger:ad-explain      # snapshot + 1-paragraph hypothesis after a pause
/android-debugger:ad-catch <Exc>  # break on uncaught exception, root-cause on hit
/android-debugger:ad-trace <sym>  # logpoint sweep across suspect call graph
/android-debugger:ad-patch <goal> # HotSwap loop with verify_via
/android-debugger:ad-detach       # clean shutdown

For "I'm stuck, please debug this for me," dispatch the orchestrator:

Agent({
  subagent_type: "android-debug-orchestrator",
  prompt: "Why does login crash on slow networks? App is com.example.app."
})

Top 10 Features

1. Attach to any debuggable app — no rebuild required. JDI over adb forward jdwp:.
2. One-shot pause snapshot — frame + locals + watches + source ref in a single cached payload.
3. FEEL expression evaluator — pure-expression language; can't mutate state by grammar.
4. Every breakpoint type — line, conditional, hit-count, logpoint, method, exception, field-watch, class-load.
5. Native JVMTI agent — C++ helper loaded via cmd activity attach-agent. Three ABIs ship pre-built.
6. HotSwap method bodies live — JVMTI RedefineClasses + d8 dexing. Pre-validated, revertible.
7. Heap walks at native speed — count instances, find referrers, walk chains to GC roots. 10–100× faster.
8. Method + allocation tracing — filter, throttle, capture args + return values. Flight-recorder mode.
9. Session persistence — breakpoints + watches saved on detach, rehydrated on reconnect.
10. Workflow skills for an AI consumer — :explain, :catch, :trace, :walk, :patch, :investigate. The agent picks the recipe.

The Workflow

Skills are short, composable recipes. Most debug sessions chain a handful.

1. Attach

/android-debugger:ad-attach

Lists debuggable PIDs, picks one (or accepts a serial: + package:), forwards a free local port to the app's JDWP port, attaches the JDI VirtualMachine, probes ART capabilities, optionally loads the JVMTI agent. Returns the capability map + any warnings (release-build detected, prior-session crash, etc.).

2. Explain why we stopped

/android-debugger:ad-explain

The cheap, high-leverage default after every pause. Calls frame_snapshot, reads top N frames + locals + watches, writes a one-paragraph hypothesis. The agent decides what to do next from that hypothesis — not from guessing.

3. Catch the exception

/android-debugger:ad-catch java.lang.NullPointerException

Sets an uncaught-exception breakpoint, resumes, reproduces, root-causes from the paused frame. Bread-and-butter workflow for "why does X crash."

4. Trace without rebuilding

/android-debugger:ad-trace "login fails sometimes"

Cursor-style logpoint sweep — drops 6–8 non-suspending logpoints across a suspect call graph, runs the failing path, harvests the timeline. Replaces Log.d archaeology entirely. No rebuild, no Gradle, no APK push.

5. Walk through unfamiliar code

/android-debugger:ad-walk MainActivity.onCreate

Sets an entry breakpoint, steps with a bounded step budget, narrates at frame boundaries. Onboarding workflow for "show me how login works."

6. Patch and verify

/android-debugger:ad-patch "fix the off-by-one in the pagination"

Goal-driven HotSwap loop. Required verify_via: clause — the patch isn't done until the verify probe passes against the live VM. Pre-validates the shape diff (no field add/remove, no superclass change), dexes via embedded d8, sends to the JVMTI agent for RedefineClasses. Revertible.

7. Detach cleanly

/android-debugger:ad-detach

Disposes the JDI VM, releases the adb forward, drains JVMTI ref tables, persists breakpoints + watches to $CLAUDE_PLUGIN_DATA/android-debugger/sessions/<serial>_<package>.json for next attach.

All Skills

Skill	What it does	When to use
:setup	Env probe — JDK, adb, ART capabilities	After install or "isn't working"
:attach	Pick + connect to a debuggable PID	Starting any session
:detach	Clean shutdown, persist state	Ending a session
:status	Current attached app, breakpoints, watches	"Where are we?"
:explain	Snapshot + hypothesis after pause	Default after every pause
:catch	Uncaught-exception break + root-cause	"Why does X crash?"
:trace	Logpoint sweep, no rebuild	"Find where X happens"
:walk	Entry break + guided step-through	"Show me how X works"
:bisect-flaky	Loop instrumented test, narrow with conditional break	"Fails 1 in 10 runs"
:patch	Goal-driven HotSwap loop with verify_via:	"Fix this and prove it"
:patch-revert	Roll back a HotSwap	Patch didn't work
:patch-status	Current HotSwap state	"What did we patch?"
:investigate	Top-level orchestrator — triage + dispatch	Catch-all "debug this for me"

Architecture

A Kotlin MCP server + a native JVMTI agent + a small set of workflow skills. No external runtime, no server process, no database.

Two halves: JDI host-side + JVMTI in-process

┌────────────────────────┐              ┌────────────────────────┐
│  CLAUDE CODE SESSION   │              │  ANDROID DEVICE         │
│                        │              │                        │
│  /android-debugger:*   │              │  ┌──────────────────┐  │
│       │                │              │  │   TARGET APP     │  │
│       ▼                │              │  │                  │  │
│  ┌──────────────────┐  │              │  │  ┌────────────┐  │  │
│  │  KOTLIN MCP SRV  │◄─┼── adb fwd ──►│──┼──► JVMTI agent│  │  │
│  │                  │  │  jdwp + UDS  │  │  │   (C++)    │  │  │
│  │  ┌────────────┐  │  │              │  │  └────────────┘  │  │
│  │  │ JDI client │◄─┼──┼── adb fwd ──►│──┼─► JDWP server   │  │
│  │  └────────────┘  │  │              │  │                  │  │
│  └──────────────────┘  │              │  └──────────────────┘  │
└────────────────────────┘              └────────────────────────┘

• JDI client — Oracle's Java Debug Interface over JDWP. Read surface (frames, locals, fields), narrow write surface (setLocal, setField, invokeMethod), event stream.
• JVMTI agent — small C++ binary loaded INTO the app process via cmd activity attach-agent. Unlocks what JDWP can't do on ART: RedefineClasses for HotSwap, IterateThroughHeap for fast walks, line-rate method+allocation events. Three ABIs pre-built: arm64-v8a, x86_64, armeabi-v7a.
• MCP tool surface — ~50 tools, snake_case <area>_<verb>, all return { ok, ... } or { ok: false, code, message, hint }. The agent reasons over JSON, not stack traces.

Skills (13)

Each /android-debugger:* command is a skill with imperative-form body. Skill bodies are written for the agent, not for human readers — that's the consumer model.

Agents (1)

Agent	Role
android-debug-orchestrator	Autonomous "debug this for me" loop — triages goal shape (crash / behavior / flaky / onboarding), dispatches to the matching skill, drives the iterative loop end-to-end, returns a structured findings report

Session data

Persistent state (breakpoints + watches) lives at ${CLAUDE_PLUGIN_DATA}/android-debugger/sessions/<serial>_<package>.json. Atomic-write + 0600 on POSIX. The data dir is per-Claude-plugin-install, never inside your repo.

plugin-data/android-debugger/sessions/
└── <serial>_<package>.json    Saved breakpoints + watches per (device, app)

Safety Nets

The plugin assumes the AI will hallucinate and try to mutate things it shouldn't. Every safety net exists because we don't trust the model to police itself against a live VM.

• Grammar-level mutation refusal — evaluate runs DMN-FEEL. FEEL has no method-call syntax. Side effects are impossible at the parser level.
• Mutation-refusal regex on eval_method — likely-mutator names (set*, add*, remove*, clear, put, delete, etc.) refuse unless allow_mutation: true is set explicitly.
• Capability-aware errors — when the device's ART can't do something, the tool returns code: capability_unavailable with a hint, instead of pretending. The agent reacts on the code.
• evaluate single-flight — one invocation worker, 10s timeout, never invoked from the event-handler thread. ART's verifier is stricter than HotSpot; primitives are boxed via vm.mirrorOf. Deadlock on INVOKE_SINGLE_THREADED is structurally prevented.
• VmCoordinator mutex — eval_method and hot_swap_* can't run concurrently. Second caller gets vm_busy immediately. No mid-swap evaluation surprises.
• HotSwap shape-diff pre-validation — ASM-backed check refuses method-add/remove, field-add/remove, superclass / interface / access-flag changes. Structured diff array surfaces the specific violation.
• HotSwap minify detection — single-letter-class-name heuristic at attach. Refuses upfront on R8-minified builds with minified_build_unsupported.
• Step budgets — :walk and step_until_method_change bound their step count. Defends against step-into loops, the top failure mode in the AI debugger landscape.
• Snapshot cache invalidation — caches by (thread, vmStateVersion). Any continue/step bumps the version. Stale snapshots can't be served.
• Capability probe at attach — the full ART JVMTI capability map ships back in the attach response so the agent knows up-front what's available on this specific device.
• JVMTI agent crash diagnostics — sigaction handlers write /data/data/<pkg>/cache/amdb_agent_crash.txt on SIGSEGV/SIGABRT/etc. Next attach picks it up and surfaces crashed_last_session.
• Studio coexistence guard — probes /proc/<pid>/maps for Android Studio's Apply-Changes agent (libperfa, studio_profiler). Refuses with agent_conflict rather than fighting Studio for control.
• Strict protocol versioning — first message on the agent socket is {method: hello, params: {protocol_version: 3}}. Mismatch returns agent_version_mismatch with both versions. No silent compat drift.
• Clean detach — vm.dispose() not vm.exit(). Shutdown hook on the JVM disposes + releases the adb forward on every exit path.

Token Efficiency by Design

• Snapshot caching — frame_snapshot keyed by (thread, vmStateVersion). The single biggest token-saver. Re-reads cost zero.
• Structured errors — code + hint instead of prose. The agent reacts on code, doesn't re-read explanations.
• Bundled tools — frame_snapshot returns frames + locals + watches + source in one call. The granular tools (get_locals, get_frames, inspect_object) are fallbacks for drill-down, not the default.
• exception_summary, framework_frame_filter, step_until_method_change — server-side bundles that collapse 5–10 round-trips into one. Less ceremony in the model's reasoning trace.
• Polling, not streaming — wait_for_event(timeout, types?) returns the next event or { timed_out: true }. MCP doesn't stream; the polling shape is cheap and consistent.

Cross-Platform

The plugin runs anywhere Claude Code runs. Server is JVM/Kotlin — runs on macOS, Linux, Windows. Agent .so files are pre-built for the device-side ABIs. Skill bash blocks avoid POSIX-only builtins (no mktemp, no GNU realpath, no sed -i '') — anything beyond java -version and adb devices routes through MCP tool calls.

Full feature list

Lifecycle

• list_devices — enumerate connected devices/emulators
• list_debuggable_processes — discover debuggable PIDs with package labels
• attach — connect to a PID, probe ART capabilities, optionally load the JVMTI agent, return the capability map + warnings
• detach — clean shutdown, persist breakpoints + watches, release adb forwards
• connection_status — current attached app, session metadata
• agent_info — live JVMTI capability map + derived feature flags

Breakpoints

• add_line_breakpoint — line, conditional (FEEL), hit-count, logpoint (non-suspending tracepoint) — one tool, four modes
• add_method_breakpoint — method entry / exit; auto-routes through JVMTI when used as a logpoint (line-rate)
• add_exception_breakpoint — caught / uncaught, per exception class
• add_field_watchpoint — access / modification (when device supports)
• add_class_load_breakpoint — pause when a class matching a JDWP-glob pattern loads
• list_breakpoints, remove_breakpoint, enable_breakpoint, disable_breakpoint
• Deferred-breakpoint queue — set bps on not-yet-loaded classes (Kotlin lambdas, inline functions, inner classes)

Execution control

• resume, pause
• step_over, step_into (with framework-frame skip filters), step_out
• run_to_line — temp breakpoint + resume
• step_until_method_change — server-side bundle, bounded step budget, returns when the frame's method changes
• wait_for_event — polled bridge over the JDI event queue (stopped, exception, class_prepare, exit)

Inspection

• frame_snapshot — bundled top-N frames + locals + watches + source ref, cached by (thread, vmStateVersion)
• list_threads, get_frames, get_locals — granular fallbacks for drill-down
• inspect_object — object fields, depth-limited
• get_array_slice — sliced array access
• exception_summary — bundled exception details (message, type, stack, framework-filtered)
• render_capabilities — human-readable capability map
• framework_frame_filter — drop framework frames (android.*, kotlin.*, java.*) from a frame list

Expression evaluation

• evaluate — DMN-FEEL expressions over paused-frame state. Binary ops, if/then/else, instance of, list comprehensions, ranges, three-valued null logic. Property access on pre-resolved object trees (depth 3 by default). String literals: single quotes.
• eval_method — explicit JDI method invocation. Mutation-refusal on likely-mutator names; opt in with allow_mutation: true. Single-flight, 10s timeout. Primitives boxed via vm.mirrorOf for ART's stricter verifier.
• add_watch, remove_watch, list_watches — re-evaluated on every pause, bundled into frame_snapshot

HotSwap (JVMTI RedefineClasses)

• hot_swap_class — single class. Server pre-validates shape diff (ASM), dexes JVM .class via embedded d8, sends to agent for atomic RedefineClasses.
• hot_swap_classes — batch swap with per-entry validation
• hot_swap_revert — roll back using bytes cached by ClassFileLoadHook
• force_re_enter — capability-gated PopFrame for paused-in-method swaps
• Minify detection at attach — refuses upfront on R8 builds with minified_build_unsupported
• Shape-diff violations surface structured diff arrays (method add/remove, field change, superclass / interface / access-flag change)
• @Composable / coroutine state-machine warnings
• android-debugger-classdiff cross-platform CLI — diffs build-dir hashes to identify changed classes for HotSwap

Heap walks (JVMTI native-speed, 10–100× JDI)

• count_instances — auto-routes through JVMTI when agent is loaded; falls back to JDI
• find_referrers — what's holding a reference to this object; works on vobj# (JVMTI) and obj# (JDI) refs
• iterate_heap_by_class — materialize up to N instances of a class as vobj# refs; reports total past max
• find_referrer_chain — BFS reverse-reference walk to GC roots, returns root_kind (jni_global, static_field, stack_local, etc.)
• All gated single-flight via VmCoordinator (30s timeout, blocks against eval_method + HotSwap)

Tracing

• start_method_trace / read_method_trace / stop_method_trace / list_method_traces — line-rate JVMTI MethodEntry/MethodExit. Filter modes: methods (exact list), class_pattern (literal prefix or wildcard), method_regex. Leaky-bucket throttling, per-session ring buffer, entry/exit symmetry under sampling, optional arg capture (real GetLocalVariableTable walk), optional return-value capture with void + was_popped_by_exception flags.
• start_alloc_trace / read_alloc_trace / stop_alloc_trace / list_alloc_traces — class-allowlisted VMObjectAlloc events with optional stack capture (depth 0–10). No object retention (would survive GC).

Heap dump (full HPROF)

• dump_heap — shells am dumpheap <pid> + adb pull for full-heap HPROF analysis outside the live VM

Logcat

• tail_logcat — start a buffered tail with regex filter; returns buffer_id
• read_logcat — read entries from a buffer; merges logpoints with tag: "debugger:logpoint"
• stop_logcat — terminate the buffer's adb logcat subprocess

Android device introspection

• get_current_activity — dumpsys activity top
• dump_view_hierarchy — uiautomator dump
• get_app_info — debuggable flag, target SDK, declared processes

Session persistence

• Breakpoints + watches save on detach to $CLAUDE_PLUGIN_DATA/android-debugger/sessions/<serial>_<package>.json
• Rehydrate on next attach to the same (serial, package). Original IDs preserved so remove_breakpoint(id) keeps working.
• Atomic-write + 0600 on POSIX. Filenames sanitized.

JVMTI agent

• C++ binary, three pre-built ABIs: arm64-v8a (~655 KB), x86_64 (~657 KB), armeabi-v7a (~401 KB) — fully stripped
• Loaded via cmd activity attach-agent. Wire protocol: line-delimited JSON-RPC 2.0 over Unix abstract-namespace socket
• Strict protocol-version handshake (v3); mismatch returns agent_version_mismatch
• Signal handlers write crash diagnostics to /data/data/<pkg>/cache/amdb_agent_crash.txt; next attach surfaces crashed_last_session
• Studio coexistence guard probes /proc/<pid>/maps for Apply-Changes artifacts; refuses with agent_conflict
• Eager capability acquisition at Agent_OnAttach; deopt cost paid once
• First-in-wins concurrency: second connect returns agent_in_use
• Auto-load on attach by default; opt out with attach({ load_agent: false })

Workflow skills

13 skills covering the canonical debug loops: :setup, :attach, :detach, :status, :explain, :catch, :trace, :walk, :bisect-flaky, :patch, :patch-revert, :patch-status, :investigate. See All Skills above.

Autonomous orchestrator

android-debug-orchestrator agent — accepts a goal, triages the shape (crash / behavior / flaky / onboarding), dispatches to the matching skill, drives the iterative loop, returns a structured findings report. One prompt in, one report out.

Requirements

• JDK 17 or newer. Android Studio bundles one — point JAVA_HOME at <AndroidStudio>/jbr if you don't have a system JDK.
• adb on PATH (or ANDROID_HOME / ANDROID_SDK_ROOT set). Comes with Android SDK platform-tools.
• A debuggable APK on a connected device or emulator. Debug variants expose JDWP via adb jdwp. Release/R8-stripped builds attach with release_build_likely warnings; locals will be mostly empty.
• Android 8 (API 26) or newer for the target app. ART JVMTI was added in Oreo.
• Claude Code with CLAUDE_PLUGIN_DATA propagation for v1.3+ persistence. Older versions still work — persistence silently disables.

Building from source

cd server
./gradlew shadowJar         # fat jar → dist/android-debugger-server.jar
./gradlew assembleAgent     # native agent → dist/agents/<abi>/libamdb_agent.so

The fat jar and agent .so files are committed to the repo so users don't need to build. The agent has its own NDK/CMake path — see agent/README.md.

Troubleshooting

adb_status: not_found — set ADB_PATH, ANDROID_HOME, or add adb to PATH. macOS: brew install --cask android-platform-tools.

code: attach_failed — app isn't built debuggable, or Android Studio's debugger is already attached. Detach the IDE first.

code: already_attached — one VM per session. /android-debugger:ad-detach first.

code: agent_conflict (v1.4+) — Android Studio's Apply-Changes agent is in the process. Detach Studio.

code: agent_version_mismatch (v1.4+) — agent loaded with an older protocol than the server expects. Force-stop the app and re-attach.

code: minified_build_unsupported (v1.5+) — HotSwap refused — class names look R8-minified. Rebuild as a debug variant.

code: redefine_unsupported_shape_change (v1.5+) — HotSwap pre-validate caught a violation. data.diff shows the specific delta (method add/remove, field change, etc.). Restart the app to land structural changes.

evaluate says "Parse error in FEEL expression" — FEEL uses single quotes for strings ('hello'), single = for equality, and/or/not for boolean logic. Method calls route through the separate eval_method tool — FEEL has no obj.method() syntax.

App ANR-killed mid-debug — the system kills processes that block the main thread >5s. Set breakpoints off the UI thread, or use logpoints (non-suspending).

Dependencies

• ca.acendas:kfeel — Kotlin DMN 1.3 FEEL implementation, powers evaluate. Bundled in the fat jar.
• com.android.tools:r8:8.7.18 — d8 dexer for HotSwap. Bundled in the fat jar.
• ASM 9.x — bytecode shape diff for HotSwap pre-validate. Bundled.
• JDI — jdk.jdi module, included with JDK 17+.

Contributing

See CONTRIBUTING.md for development setup, end-to-end test loop against a public sample Android app, and conventions.

License

MIT — see LICENSE.