Live Debugging MCP

Live DAT Debugging with MCP (Android)

Use this skill when a developer is debugging an Android DAT app and has a local

DAT Inspector MCP server or DAT debug server available to the agent. This is

the live-runtime counterpart to dat-docs-mcp: use docs search for API lookup,

and use this skill for observed app/device behavior.

Ground rules

• Stay read-only unless the user explicitly asks for an app code change.
• Do not mutate Meta AI app, device, account, permission, registration, or app

state.

• Treat companion-app/device results as boundary diagnosis from app-visible DAT

events, not as direct access to companion app internals.

• Use live DAT evidence before guessing: registration, permissions, device

selection, link state, session state, stream state, typed errors, and SDK logs.

• If the MCP tools are not configured, ask the developer to enable their local

DAT debug setup and fall back to logs plus search_dat_docs.

Normal agent loop

• Discover and connect to the running app debug server:
• discover_debug_servers
• connect_to_debug_server
• Establish the baseline with all three calls before diagnosing deeper:
• get_connection_status
• get_sdk_state
• get_dat_readiness

Do not skip get_connection_status; it separates MCP/debug-server

connectivity from SDK, registration, permission, session, and stream state.

• If the issue looks like Meta AI app or device boundary behavior, inspect:
• get_companion_boundary_diagnosis
• get_device_path
• get_permissions
• get_device_properties
• Ask the developer to reproduce the failing Android flow while connected.
• Wait for narrow evidence instead of polling everything:
• wait_for_events with category or source
• get_errors
• get_event_digest
• For handoff, collect a redacted bundle:
• export_diagnostic_bundle

Evidence map

• Initialization: app logs around Wearables.initialize(context)
• Registration: Wearables.registrationState and wearables.registrationState
• Device availability: Wearables.devices plus debug events from

wearables.devices, device.compatibility, and device.properties

• Device link: device.linkState
• Permissions: Wearables.checkPermissionStatus(...), device.permission,

check_permissions, and get_permissions

• Session: createSession(...), session.start(), deviceSession.state,

session.state, and session errors

• Stream: session.addCamera(...), camera.stream.start(), camera.stream.state, frame

counters, and stream errors

• DAM/DWA-visible transport: sdk.usesDam and DAM/DWA error values

Diagnosis patterns

• Registration blocked: verify Android manifest metadata, app credentials or

Developer Mode setup, and callback/deeplink handling.

• No eligible device: inspect Wearables.devices, device compatibility, and

device.linkState before changing selector code.

• Permission failure: use get_permissions and get_companion_boundary_diagnosis;

do not assume Android runtime permission is the same as DAT permission through

the Meta AI app/device boundary.

• Session fails before stream creation: inspect session errors and selected

device compatibility before changing camera code.

• Stream fails after session start: inspect stream state, camera permission, and

recent errors before changing frame processing.

Output expectations

When summarizing, name the evidence plane, the blocking state, and the next

developer action. Example:

DAT readiness is blocked at permissions: camera is denied in app-visible DAT
events. Grant the DAT camera permission in Meta AI, return to the app, then
retry session.start() and camera.stream.start() while the MCP connection waits for
permission and stream events.