Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/wittyreference/twilio-claude-plugin/android-sdknpx skills add wittyreference/twilio-claude-plugin --skill android-sdkgit clone --depth 1 https://github.com/wittyreference/twilio-claude-pluginWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00010 | $0.04496 |
| Opus 5 | $0.00005 | $0.02248 |
| Sonnet 5 | $0.00002 | $0.00899 |
| Haiku 4.5 | $0.00001 | $0.00450 |
Grade A, and why
android-sdk scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 464 lines — stays where its author put it; the contents beside it link to each section on GitHub.
name: android-sdk description: Twilio Voice and Video Android SDK development guide. Use when building native Android calling apps, configuring FCM push notifications, integrating ConnectionService, managing Android audio devices, setting up Gradle dependencies, handling runtime permissions, or testing on Android Emulator.
Android SDK Development Skill
Android-specific guide for building native Voice and Video applications with Twilio's Android SDKs. Load this skill when working on Android-native Twilio integrations — Gradle setup, FCM push, ConnectionService, permissions, audio routing, emulator testing, and platform gotchas.
This skill covers the Android implementation layer only. For general Voice SDK concepts (AccessToken generation, TwiML App setup, edge locations, call lifecycle), see /skills/voice-sdks.md. For Video room types, recording, and compositions, see /skills/video/SKILL.md.
Evidence date: 2026-03-29. SDK versions: Voice 6.10.x, Video 7.10.x, AudioSwitch 1.2.5.
Scope
CAN
- Build native Android calling apps with Voice SDK (Kotlin/Java)
- Build native Android video apps with Video SDK
- Receive incoming calls via FCM push notifications (background + foreground)
- Integrate with Android Telecom framework via ConnectionService
- Route audio between earpiece, speaker, Bluetooth, and wired headset
- Run preflight connectivity tests (Voice SDK 6.7.0+)
- Send/receive custom parameters on calls via
ConnectOptions.params()andCallInvite.getCustomParameters() - Capture real-time call quality stats via
Call.getStats() - Test on Android Emulator with virtual microphone and network simulation
- Coexist Voice + Video SDKs in the same app (separate WebRTC namespaces)
CANNOT
- Record audio locally on device — all recording is server-side via TwiML or REST API
- Use Capability Tokens — Android SDK requires Access Tokens (JWT); Capability Tokens cause auth errors
- Receive incoming calls without FCM — push notifications are the only delivery mechanism when the app is backgrounded; foreground-only signaling is not reliable for production
- Run on API < 25 — Voice and Video SDKs require Android 7.1+ (Nougat MR1); ConnectionService flavor requires API 26+
- Use Elastic SIP Trunking — SDKs connect via Programmable Voice only
- Mix WebRTC libraries freely on pre-6.x Voice SDK — Voice SDK < 3.2.0 used
org.webrtc.*namespace, conflicting with third-party WebRTC. 3.2.0+ remapped totvo.webrtc.* - Access system call log with SELF_MANAGED PhoneAccount — self-managed ConnectionService does not appear in the system dialer or call history
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 464 lines · 10 tokens per session scan A 5c12854cac3b
android-sdk is a skill published in the GitHub repository wittyreference/twilio-claude-plugin (2 stars, last pushed 3mo ago), licensed MIT. It adds 10 tokens to every session and 4,496 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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