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 yintzuyuan/glyphs-reference --skill glyphs-objc-headersgit clone --depth 1 https://github.com/yintzuyuan/glyphs-referenceWrote 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/yintzuyuan/glyphs-reference/glyphs-objc-headers)<a href="https://agentmods.dev/skills/yintzuyuan/glyphs-reference/glyphs-objc-headers"><img src="https://agentmods.dev/badge/skills/yintzuyuan/glyphs-reference/glyphs-objc-headers/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/yintzuyuan/glyphs-reference/glyphs-objc-headers"><img src="https://agentmods.dev/badge/skills/yintzuyuan/glyphs-reference/glyphs-objc-headers.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00069 | $0.01736 |
| Opus 5 | $0.00034 | $0.00868 |
| Sonnet 5 | $0.00014 | $0.00347 |
| Haiku 4.5 | $0.00007 | $0.00174 |
Grade A, and why
glyphs-objc-headers 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 10d 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 — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GlyphsCore Obj-C Headers Skill
Query 174 Objective-C header files from the GlyphsCore framework to find class APIs, protocol methods, properties, enums, and constants. This skill is the authoritative surface for the Objective-C side of the Glyphs API — Python wrappers ultimately bridge through these declarations.
Headers Path
${GLYPHS_APP_HEADERS_PATH:-/Applications/Glyphs 3.app/Contents/Frameworks/GlyphsCore.framework/Versions/A/Headers}
If the env var is not set, use the default path above. The path resolves to the installed Glyphs 3 application bundle; the skill works without a separate GlyphsSDK checkout for this domain.
When to use this skill versus the Python skill
| Question | Use |
|---|---|
| "What properties does GSFont expose in Python?" | glyphs-python-api |
| "What's the Obj-C selector for GSFont.familyName?" | This skill |
| "What protocol methods can a Filter plugin implement?" | This skill (GlyphsFilterProtocol.h) |
"What does _LightTableInterface look like at runtime?" |
This skill + glyphs-light-table (cross-ref) |
| "What enum cases exist for GSFontMaster axes?" | This skill (header typedef enum) |
Quick Start Patterns
# Find a class definition
Grep "@interface GSFont" path/to/Headers/
# Find all properties of a class
Grep "@property" path/to/Headers/GSFont.h
# Find a protocol and its methods
Read path/to/Headers/GlyphsReporterProtocol.h
# Search for an enum or constant
Grep "typedef.*enum" path/to/Headers/ --glob "*.h"
# Find which header declares a method
Grep "drawForegroundForLayer" path/to/Headers/
Protocol Files
Glyphs plugin protocols follow a consistent naming convention:
| Pattern | Example |
|---|---|
Glyphs*Protocol.h |
GlyphsReporterProtocol.h, GlyphsFilterProtocol.h |
GS*Protocol.h |
GSAppDelegateProtocol.h, GSContentProtocol.h |
To list all protocols:
Glob path/to/Headers/*Protocol*.h
Advanced Search
# Find subclass relationships
Grep "@interface GS\\w+ : " path/to/Headers/
# Find all extern constants
Grep "^extern" path/to/Headers/
# Find category extensions for a class (e.g., GSLayer+*)
Glob path/to/Headers/GSLayer+*.h
# Find delegate/notification patterns
Grep "Notification\|Delegate" path/to/Headers/
What ships with it
1 file 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.
- 10d ago First seen · 168 lines · 69 tokens per session scan A 23bfc989c5e7
glyphs-objc-headers is a skill published in the GitHub repository yintzuyuan/glyphs-reference (6 stars, last pushed 2mo ago), licensed MIT. It adds 69 tokens to every session and 1,736 once invoked, about $0.0003 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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