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Session Lifecycle Agent Skill

by facebook

Session state, stream state, pause and resume behavior, and device availability monitoring

752 tokens
context cost
the whole folder, loaded on every use
1
files
instructions only
0
copies elsewhere
how many repositories repackaged it
339
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/facebook/meta-wearables-dat-android --skill session-lifecycle

The instruction itself

9 sections, as written by the author

Session Lifecycle (Android)

Manage session and stream state in DAT SDK integrations.

Create a Session with Wearables.createSession(...), start it, then attach capabilities such as camera streaming. Session lifecycle and stream lifecycle are related but distinct.

Session states

| State | Meaning | App action |

|-------|---------|------------|

| IDLE | Session created, not started yet | Call session.start() |

| STARTING | Connecting to the device | Show loading UI |

| STARTED | Session active and ready for capabilities | Add or use capabilities |

| PAUSED | Session temporarily suspended | Keep state, wait for resume or stop |

| STOPPING | Session is shutting down | Stop user work and wait |

| STOPPED | Session ended | Release resources and create a new session if needed |

Observe session state

val session = Wearables.createSession(AutoDeviceSelector()).getOrElse { error ->
    throw IllegalStateException(error.description)
}
session.start()

lifecycleScope.launch {
    session.state.collect { state ->
        when (state) {
            DeviceSessionState.STARTED -> onStarted()
            DeviceSessionState.PAUSED -> onPaused()
            DeviceSessionState.STOPPED -> onStopped()
            else -> Unit
        }
    }
}

Stream state

Camera streaming has its own state flow after you attach a stream:

STOPPED -> STARTING -> STARTED -> STREAMING -> STOPPING -> STOPPED -> CLOSED

lifecycleScope.launch {
    camera.stream.state.collect { state ->
        // React to camera capability state changes
    }
}

Common transitions

The SDK may pause or stop a session when:

  • Another experience takes over the device
  • The user removes or folds the glasses
  • Bluetooth connectivity drops
  • The user unregisters the app or revokes needed access

Pause and resume

When a session is paused:

  • The device connection may remain active
  • Attached capabilities stop doing useful work
  • Your app should wait for the next observed session state instead of trying to force a restart

Device availability

lifecycleScope.launch {
    Wearables.devices.collect { devices ->
        // Update the list of available devices
    }
}

Use Wearables.devices and device metadata to decide when it is sensible to create a new session after a stop.

Checklist

  • [ ] Handle all DeviceSessionState values you care about
  • [ ] Observe stream state separately from session state
  • [ ] Release resources only after stop or close
  • [ ] Recreate sessions after terminal stops instead of reusing dead ones
  • [ ] Surface typed SessionError and StreamError failures

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How to use it

Copy the folder

Take facebook/meta-wearables-dat-android-session-lifecycle from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.