Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add yintzuyuan/glyphs-reference/plugin install 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-file-format)<a href="https://agentmods.dev/skills/yintzuyuan/glyphs-reference/glyphs-file-format"><img src="https://agentmods.dev/badge/skills/yintzuyuan/glyphs-reference/glyphs-file-format/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-file-format"><img src="https://agentmods.dev/badge/skills/yintzuyuan/glyphs-reference/glyphs-file-format.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 | $0.00057 | $0.01672 |
| Opus 5 | $0.00028 | $0.00836 |
| Sonnet 5 | $0.00011 | $0.00334 |
| Haiku 4.5 | $0.00006 | $0.00167 |
Grade A, and why
glyphs-file-format 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 12d 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 — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GlyphsFileFormat Spec & Schema Skill
Query the .glyphs file format specification (v2/v3) and JSON Schema definitions from GlyphsSDK. This skill answers two distinct kinds of questions: (1) "What does field X mean and what type is it?" using the human-readable spec, and (2) "How do I validate this file?" using the JSON Schema.
Run all scripts from this skill's base directory. Prepend the base directory path to
scripts/when executing.
Environment
${GLYPHS_SDK_PATH} # Required: Path to GlyphsSDK directory
If the variable is not set, fall back to the plugin-relative submodule at ${CLAUDE_PLUGIN_ROOT}/GlyphsSDK/.
Two data sources — which to use
| Question | Use | Reason |
|---|---|---|
| What does this key mean? | query_spec.py |
Spec includes prose descriptions |
| What type is allowed for this key? | query_spec.py |
Spec shows type + default + range |
| Is this file structurally valid? | query_schema.py + the validator script |
JSON Schema is machine-checkable |
| What changed from v2 to v3? | query_spec.py with --version 2 then default v3 |
Spec is per-version |
Quick Start: Query a Type Definition
python3 scripts/query_spec.py glyph # v3 definition (default)
python3 scripts/query_spec.py glyph --version 2 # v2 definition
Returns the complete definition from the spec including all properties, types, defaults, and descriptions.
Quick Start: List All Types
python3 scripts/query_spec.py --list # All v3 definitions
python3 scripts/query_spec.py --list --version 2 # All v2 definitions
Returns [{name, gs_class}] for every type in the spec. Use this to discover what's available before drilling into a specific type.
Quick Start: Query JSON Schema
python3 scripts/query_schema.py layer # glyphs-3 schema (default)
python3 scripts/query_schema.py layer --schema glyphs-1 # v2 schema
python3 scripts/query_schema.py --list # List all $defs
python3 scripts/query_schema.py --list --schema fontinfo-3 # List fontinfo $defs
What ships with it
8 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.
- references/format-overview.md 4.0 KB
- scripts/_format_utils.py 4.0 KB runs code
- scripts/query_schema.py 2.3 KB runs code
- scripts/query_spec.py 2.0 KB runs code
- tests/conftest.py 4.0 KB runs code
- tests/test_format_utils.py 7.6 KB runs code
- tests/test_query_schema.py 3.7 KB runs code
- tests/test_query_spec.py 3.3 KB runs code
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.
- 12d ago First seen · 140 lines · 57 tokens per session scan A cc556ae3076f
glyphs-file-format is a skill published in the GitHub repository yintzuyuan/glyphs-reference (6 stars, last pushed 2mo ago), licensed MIT. It adds 57 tokens to every session and 1,672 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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