What is glyphs-python-api?

A searchable reference for the Glyphs Python scripting API, the programming interface used to automate the Glyphs font-design application. It documents font, glyph, layer, and related objects, functions, and constants.

Use it when writing or debugging Python scripts for Glyphs, including tasks involving GSFont, GSLayer, GSGlyph, font data, and other documented API objects.

It removes the need to search through the full API documentation to find a property, method, constant, or example.

glyphs-python-api — Skill for Claude Code by yintzuyuan

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 yintzuyuan/glyphs-reference --skill glyphs-python-api

Clone the repo

git clone --depth 1 https://github.com/yintzuyuan/glyphs-reference

Made for: Claude Code.

Or install glyphs-reference, the plugin that ships this one along with the rest of its 10 skills, 1 agent.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/yintzuyuan/glyphs-reference/glyphs-python-api/github.svg)](https://agentmods.dev/skills/yintzuyuan/glyphs-reference/glyphs-python-api)

Your own site

<a href="https://agentmods.dev/skills/yintzuyuan/glyphs-reference/glyphs-python-api"><img src="https://agentmods.dev/badge/skills/yintzuyuan/glyphs-reference/glyphs-python-api/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/yintzuyuan/glyphs-reference/glyphs-python-api"><img src="https://agentmods.dev/badge/skills/yintzuyuan/glyphs-reference/glyphs-python-api.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 740 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.

Model	Per session	Once invoked
Fable 5.1	$0.00068	$0.00740
Opus 5.5	$0.00027	$0.00296
Sonnet 5.5	$0.00014	$0.00148
Haiku 4.5	$0.00007	$0.00074

Measured 1mo ago against content hash 1165b3d98482, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

glyphs-python-api 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 1mo ago.

The scan reads SKILL.md. This mod also ships 9 executable files (scripts/_parse_rst.py, scripts/_sdk_utils.py, scripts/read_class.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/glyphs-python-api/SKILL.md · 98 lines

How it starts

The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Glyphs Python API Reference

Python Scripting API reference extracted from GlyphsSDK Sphinx documentation. Covers all 35 wrapper classes, standalone helper functions, and constants with their actual values.

Scripts

Run all scripts from this skill's base directory. Prepend the base directory path to scripts/ when executing.

Script	Purpose	Output
`search_api.py`	Search/list classes, members, constants, functions	Classes with counts, or search results
`read_class.py`	Read class/member/function details	Full properties, methods, types, examples

Usage

Browse Classes

# List all 35 classes with property/method counts
python scripts/search_api.py

# Search across classes, properties, methods, constants
python scripts/search_api.py --search "layer"

# List all constants with values
python scripts/search_api.py --constants

# List standalone functions
python scripts/search_api.py --functions

Read Details

# Full class details (properties + methods + descriptions)
python scripts/read_class.py GSFont

# Specific member (type, description, examples)
python scripts/read_class.py GSFont --member masters

# Summary (property/method names only)
python scripts/read_class.py GSFont --summary

# Cross-reference relationships
python scripts/read_class.py GSFont --relationships

# Standalone function details
python scripts/read_class.py --function divideCurve

Workflow Example

User: "How do I access font masters in Python?"

1. Search for relevant classes:
   $ python scripts/search_api.py --search "master"
   → GSFontMaster class + related properties

2. Read the class overview:
   $ python scripts/read_class.py GSFontMaster --summary
   → All property/method names

3. Get specific member details:
   $ python scripts/read_class.py GSFontMaster --member customParameters
   → Description, type, code examples

4. Check relationships:
   $ python scripts/read_class.py GSFontMaster --relationships
   → Referenced by GSFont, GSLayer, etc.

Read the full file on GitHub · 98 lines

Files

What ships with it

10 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.

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.

1mo ago First seen · 98 lines · 68 tokens per session scan A 1165b3d98482

Subscribe to this mod's changes

glyphs-python-api is a skill published in the GitHub repository yintzuyuan/glyphs-reference (6 stars, last pushed 4mo ago), licensed MIT. It adds 68 tokens to every session and 740 once invoked, about $0.0003 per session on Opus 5.5. 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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