ax-energy-ref

ax-energy-ref is a skill for Claude Code from Kasempiternal/axiom-v2. It costs 39 tokens per session (4,651 once invoked), scanned A, original, MIT.

A reference for reducing energy use in iOS apps across timers, network requests, location, display updates, background tasks, and notifications. It also covers tools for measuring energy consumption.

In plain words
What is it for?
Configuring energy-conscious network sessions, timer tolerance, background downloads, Power Profiler recordings, MetricKit monitoring, and related iOS APIs.
Why use it?
It gives specific API settings and measurement steps for diagnosing battery use and choosing less wasteful background work.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: positional $N argument.

Part of the axiom plugin — 40 skills, 8 commands, 12 agents, 2 hooks shipped together

Good fit Configuring energy-conscious network sessions, timer tolerance, background downloads, Power Profiler recordings, MetricKit monitoring, and related iOS APIs.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/kasempiternal/axiom-v2/ax-energy-ref
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.

Any agent
npx skills add Kasempiternal/axiom-v2 --skill ax-energy-ref
Clone the repo
git clone --depth 1 https://github.com/Kasempiternal/axiom-v2

Made for: Claude Code.

Or install axiom, the plugin that ships this one along with the rest of its 40 skills, 8 commands, 12 agents, 2 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.

agentmods badge for ax-energy-ref

README.md
[![agentmods](https://agentmods.dev/badge/skills/kasempiternal/axiom-v2/ax-energy-ref/github.svg)](https://agentmods.dev/skills/kasempiternal/axiom-v2/ax-energy-ref)
Your own site
<a href="https://agentmods.dev/skills/kasempiternal/axiom-v2/ax-energy-ref"><img src="https://agentmods.dev/badge/skills/kasempiternal/axiom-v2/ax-energy-ref/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.

agentmods 80×15 button for ax-energy-ref

Your own site · 80×15
<a href="https://agentmods.dev/skills/kasempiternal/axiom-v2/ax-energy-ref"><img src="https://agentmods.dev/badge/skills/kasempiternal/axiom-v2/ax-energy-ref.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,651 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00039 $0.04651
Opus 5 $0.00019 $0.02325
Sonnet 5 $0.00008 $0.00930
Haiku 4.5 $0.00004 $0.00465

Measured 11d ago against content hash d813c3c53632, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

ax-energy-ref 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 11d 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.

axiom-plugin/skills/ax-energy-ref/SKILL.md · 660 lines

How it starts

The opening of the file, as written. The whole thing — 660 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Energy API Reference

Quick Patterns

Timer APIs

// NSTimer with tolerance
let timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { [weak self] _ in
    self?.updateUI()
}
timer.tolerance = 0.1  // 10% minimum

// Combine Timer
Timer.publish(every: 1.0, tolerance: 0.1, on: .main, in: .default)
    .autoconnect()
    .sink { [weak self] _ in self?.refresh() }
    .store(in: &cancellables)

// DispatchSource timer with leeway
let timer = DispatchSource.makeTimerSource(queue: queue)
timer.schedule(deadline: .now(), repeating: .seconds(1), leeway: .milliseconds(100))
timer.setEventHandler { [weak self] in self?.performWork() }
timer.resume()

URLSession Energy-Conscious Config

let config = URLSessionConfiguration.default
config.waitsForConnectivity = true
config.allowsExpensiveNetworkAccess = false
config.allowsConstrainedNetworkAccess = false
let session = URLSession(configuration: config)

Discretionary Background Download

let config = URLSessionConfiguration.background(withIdentifier: "com.app.downloads")
config.isDiscretionary = true
config.sessionSendsLaunchEvents = true
let session = URLSession(configuration: config, delegate: self, delegateQueue: nil)

let task = session.downloadTask(with: url)
task.earliestBeginDate = Date(timeIntervalSinceNow: 2 * 60 * 60)
task.countOfBytesClientExpectsToSend = 200
task.countOfBytesClientExpectsToReceive = 500_000
task.resume()

Location Accuracy Options

Constant Accuracy Battery Impact Use Case
kCLLocationAccuracyBestForNavigation ~1m Extreme Turn-by-turn only
kCLLocationAccuracyBest ~10m Very High Fitness tracking
kCLLocationAccuracyNearestTenMeters ~10m High Precise positioning
kCLLocationAccuracyHundredMeters ~100m Medium Store locators
kCLLocationAccuracyKilometer ~1km Low Weather, general
kCLLocationAccuracyThreeKilometers ~3km Very Low Regional content

Read the full file on GitHub · 660 lines

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.

  1. 11d ago First seen · 660 lines · 39 tokens per session scan A d813c3c53632

Subscribe to this mod's changes

ax-energy-ref is a skill published in the GitHub repository Kasempiternal/axiom-v2 (4 stars, last pushed 6mo ago), licensed MIT. It adds 39 tokens to every session and 4,651 once invoked, about $0.0002 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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