Txt Core Text

Quality score: 70/100 · Category: Security · Sub-category: security-misc

Use Core Text directly — CTLine, CTRun, CTFramesetter, CTTypesetter, CTFont, CTRunDelegate — for glyph-level access, custom typesetting, hit testing outside a text container, font tables, or per-glyph Core Graphics rendering. Use when you need glyph IDs and positions, custom line breaking, drawing text into a CGContext, OpenType feature inspection, or inline non-text elements with custom metrics. Read the actual rendering pipeline (especially the coordinate flip) before reciting fixes — most Core Text bugs are inverted axes or attribute-key type mismatches. Do NOT use when TextKit 2 already exposes the APIs you need — see txt-textkit2.

What this skill does

Txt Core Text is a production-ready Claude Code skill (quality score 70/100) in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/txt-core-text/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when you need glyph IDs and positions, custom line breaking, drawing text into a CGContext, OpenType feature inspection, or inline non-text elements with custom metrics. Read the actual rendering pipeline (especially the coordinate flip) before reciting fixes — most Core Text bugs are inverted axes or attribute-key type mismatches.

Who uses this skill

The Txt Core Text skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/txt-core-text
curl -L https://claudskills.com/skills/txt-core-text/SKILL.md \
  -o ~/.claude/skills/txt-core-text/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/txt-core-text/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/txt-core-text/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\txt-core-text\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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Part of ClaudSkills — the open registry for Claude Code skills. · What's New · Install guide · About · llms.txt

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