A guide to Apple’s Swift Charts framework for displaying data as bars, lines, areas, points, and reference lines. It also covers chart axes, color categories, and horizontal scrolling.

Use it to build visual reports, trend graphs, category comparisons, and charts that can scroll through large datasets in a Swift app.

It gives you the patterns needed to turn data into readable charts without working out the chart structure and common settings alone.

charts — Skill by Abdullah4AI

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/abdullah4ai/apple-developer-toolkit/charts

Any agent

npx skills add Abdullah4AI/apple-developer-toolkit --skill charts

Clone the repo

git clone --depth 1 https://github.com/Abdullah4AI/apple-developer-toolkit

Made for: Claude Code, Codex.

Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 143 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	$0.00033	$0.00143
Opus 5	$0.00016	$0.00072
Sonnet 5	$0.00007	$0.00029
Haiku 4.5	$0.00003	$0.00014

Measured 2d ago against content hash 723c7d4d9428, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

charts 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.

swiftship/internal/skills/data/features/charts/SKILL.md · 14 lines

What it actually says

Charts

SWIFT CHARTS:

import Charts; use Chart { } container
BarMark, LineMark, AreaMark, PointMark, RuleMark for data visualization
.foregroundStyle(by: .value("Category", item.category)) for color coding
chartXAxis { AxisMarks() }, chartYAxis { AxisMarks() } for custom axis labels
Extract Chart into a separate computed property to avoid body complexity
Use .chartScrollableAxes(.horizontal) for large datasets

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.

2d ago First seen · 14 lines · 33 tokens per session scan A 723c7d4d9428

Subscribe to this mod's changes

charts is a skill published in the GitHub repository Abdullah4AI/apple-developer-toolkit (10 stars, last pushed 5d ago), licensed MIT. It adds 33 tokens to every session and 143 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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