A guide to building native iPhone and iPad calling or video apps with Twilio's Voice and Video software libraries.

Use it when writing Swift or Objective-C apps for phone calls, video rooms, group conferencing, VoIP notifications, or CallKit integration.

It addresses Apple-specific requirements such as CallKit, background call notifications, audio sessions, permissions, and interruptions.

ios-sdk — Skill for Claude Code and Codex by wittyreference: A guide to building native iPhone and iPad calling…

Install

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.

agentmods

npx agentmods add skills/wittyreference/twilio-claude-plugin/ios-sdk

Any agent

npx skills add wittyreference/twilio-claude-plugin --skill ios-sdk

Clone the repo

git clone --depth 1 https://github.com/wittyreference/twilio-claude-plugin

Made for: Claude Code, Codex.

Or install twilio-claude-plugin, the plugin that ships this one along with the rest of its 31 skills, 18 commands, 7 agents, 5 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/wittyreference/twilio-claude-plugin/ios-sdk.svg)](https://agentmods.dev/skills/wittyreference/twilio-claude-plugin/ios-sdk)

Your own site

<a href="https://agentmods.dev/skills/wittyreference/twilio-claude-plugin/ios-sdk"><img src="https://agentmods.dev/badge/skills/wittyreference/twilio-claude-plugin/ios-sdk.svg" alt="Measured on agentmods" height="20"></a>

Per session 10 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,762 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What 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	$0.03762
Opus 5	$0.00005	$0.01881
Sonnet 5	$0.00002	$0.00752
Haiku 4.5	$0.00001	$0.00376

Measured 3d ago against content hash 77eb44e6afa2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ios-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 3d 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.

skills/ios-sdk/SKILL.md · 262 lines

How it starts

The opening of the file, as written. The whole thing — 262 lines — stays where its author put it; the contents beside it link to each section on GitHub.

name: ios-sdk description: Twilio iOS SDK development guide (Voice + Video). Use when building native iOS calling apps, video conferencing, CallKit integration, VoIP push notifications, or debugging iOS-specific platform issues.

iOS SDK Development Skill

iOS-specific platform guide for building native apps with Twilio Voice SDK 6.x and Video SDK 5.x. Load this skill when working on Swift/Objective-C code that integrates Twilio SDKs, or when debugging iOS-specific issues like CallKit, PushKit, background modes, or audio session conflicts. Medium degree of freedom — preferred patterns exist but vary by app architecture.

Evidence date: 2026-03-29. Account: ACxx...xx SDK versions: Voice 6.13.6, Video 5.11.2.

Scope

CAN

Guide native iOS app development with Twilio Voice SDK (PSTN calling, client-to-client)
Guide native iOS app development with Twilio Video SDK (group rooms, tracks, recording)
Configure CallKit for native call UI integration (incoming and outgoing)
Set up VoIP push notifications via PushKit for backgrounded incoming calls
Handle iOS audio session management (categories, modes, interruptions, routing)
Handle iOS permission flows (microphone, camera, local network)
Generate server-side AccessTokens with Voice and Video grants for iOS clients
Debug iOS-specific issues (audio routing, background mode, push registration)
Advise on app lifecycle concerns (foreground, background, suspended, terminated)

CANNOT

Build or compile iOS apps — This skill advises on patterns; Xcode is required to build
Test on iOS simulator for media — Simulator has no camera; microphone support is limited
Use Elastic SIP Trunking from iOS SDK — SDKs connect via Programmable Voice only
Record client-side — All recording is server-side via TwiML or Calls API
Run without a server-side token endpoint — iOS SDK requires AccessToken JWT from your backend
Use Video SDK without API Key auth — Video AccessTokens require API Key + Secret, not Auth Token
Receive VoIP pushes without CallKit on iOS 13+ — Apple requires reportNewIncomingCall inside PushKit callback; without it, the system terminates your app
Share screen on iOS via Video SDK without ReplayKit — Screen capture requires a Broadcast Upload Extension
Use Carthage with Video SDK — Carthage does not support .xcframeworks
Mix ConversationRelay WebSocket with iOS Voice SDK — ConversationRelay connects a PSTN call to a WebSocket server, not an SDK client; the iOS SDK connects via WebRTC

Read the full file on GitHub · 262 lines

Files

What ships with it

4 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.

Changes

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.

3d ago First seen · 262 lines · 10 tokens per session scan A 77eb44e6afa2

Subscribe to this mod's changes

ios-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 3,762 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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