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 skills add TalissonVitorino/kmp-ios-skills --skill callkitgit clone --depth 1 https://github.com/TalissonVitorino/kmp-ios-skillsWrote 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.
[](https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/callkit)<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/callkit"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/callkit/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/callkit"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/callkit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 18 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 30 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 5.1 | $0.00208 | $0.04508 |
| Opus 5 | $0.00104 | $0.02254 |
| Sonnet 5 | $0.00042 | $0.00902 |
| Haiku 4.5 | $0.00021 | $0.00451 |
Grade A, and why
callkit 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 12d 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 — 349 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CallKit + PushKit (iOS)
System call UI for VoIP: native incoming/outgoing screens, lock-screen answer, Recents integration, and caller ID / blocking. Grounded in Apple's CallKit and PushKit frameworks; iOS 26 era.
- Two frameworks, one flow: PushKit wakes the app for an incoming call; CallKit renders the call and owns the audio session.
- Non-VoIP push (chat, marketing, transaction alerts) →
push-notifications. PushKit VoIP pushes are only for calls and are policed (see below). - Caller-ID source data (names/labels for numbers) often comes from
contacts-frameworkor your backend; the Call Directory extension just publishes it.
Contents
- Capabilities & Info.plist
- Architecture
- CXProvider (system-facing)
- CXProviderDelegate — performing actions
- Audio session timing
- CXCallController (app-initiated)
- PushKit VoIP push — the golden rule
- Call Directory extension (caller ID + blocking)
- Correctness checklist
- References:
references/voip-push.md,references/call-directory.md
Capabilities & Info.plist
- Background Modes (
UIBackgroundModes):voip(PushKit wake) andaudio(keep audio alive in background). Withoutvoip,PKPushRegistrynever delivers. - Push Notifications capability + APNs. VoIP pushes use a VoIP-services APNs auth key/token; the VoIP push token is separate from the standard
application(_:didRegisterForRemoteNotificationsWithDeviceToken:)token. - Microphone:
NSMicrophoneUsageDescriptionis required or audio capture crashes. - Call Directory ships as an app extension target (CXCallDirectoryProvider) with its own bundle id; enable it under Settings → Apps → Phone → Call Blocking & Identification (or Settings → Phone on older layouts).
- CallKit is unavailable in some regions (e.g. mainland China). Guard
CXProvider-driven UI and degrade to an in-app screen where it isn't permitted.
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.
- 12d ago First seen · 349 lines · 208 tokens per session scan A 1426f8422a0f
callkit is a skill published in the GitHub repository TalissonVitorino/kmp-ios-skills (12 stars, last pushed 18d ago), licensed MIT. It adds 208 tokens to every session and 4,508 once invoked, about $0.0010 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 2026-08-30.
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