thierryc/Glyphs-mcp
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Glyphs MCP is a Machine-Control-Protocol server designed for the Glyphs app, providing font-specific tools to AI/LLM agents.
Glyphs MCP
Site: https://ap.cx/gmcp
A Model Context Protocol server for Glyphs that exposes font‑specific tools to AI/LLM agents.
What Is an MCP Server?
A Model Context Protocol server is a lightweight process that:
- Registers tools (JSON‑RPC methods) written in the host language (Python here).
- Streams JSON output back to the calling agent.
Command Set (v0.3)
| Tool | Description |
|---|---|
list_open_fonts | List all open fonts and basic metadata. |
get_font_glyphs | Return glyph list and key attributes for a font. |
get_font_masters | Detailed master information for a font. |
get_font_instances | List instances and their interpolation data. |
get_glyph_details | Full glyph data including layers, paths, components. |
get_font_kerning | All kerning pairs for a given master. |
create_glyph | Add a new glyph to the font. |
delete_glyph | Remove a glyph from the font. |
update_glyph_properties | Change unicode, category, export flags, etc. |
copy_glyph | Duplicate outlines / components from one glyph to another. |
update_glyph_metrics | Adjust width and side‑bearings. |
get_glyph_components | Inspect components used in a glyph. |
add_component_to_glyph | Append a component to a glyph layer. |
add_anchor_to_glyph | Add an anchor to a glyph layer. |
set_kerning_pair | Set or remove a kerning value. |
get_selected_glyphs | Info about glyphs currently selected in UI. |
get_selected_font_and_master | Current font + master and selection snapshot. |
get_glyph_paths | Export paths in a JSON format suitable for LLM editing. |
set_glyph_paths | Replace glyph paths from JSON. |
execute_code | Execute arbitrary Python in the Glyphs context. |
execute_code_with_context | Execute Python with injected helper objects. |
save_font | Save the active font (optionally to a new path). |
Install & Setup
- Coming soon: consolidated setup docs will live in this README.
Build the Glyphs Plug‑in
# from the project root
source glyphs-build-env/bin/activate
# pull vendored libs & build the bundle
src/glyphs-mcp/scripts/vendor_deps.sh
The script updates the plugin’s site‑packages inside src/glyphs-mcp/Glyphs MCP.glyphsPlugin.
Copy or create a symlink (alias) of this plugin into ~/Library/Application Support/Glyphs 3/Plugins/, then restart Glyphs.
After regenerating the ObjectWrapper documentation, refresh the bundled copy with:
python src/glyphs-mcp/scripts/copy_documentation.py
To start the Glyphs MCP server, open the Edit menu and choose Start MCP Server.
The server will be available at http://127.0.0.1:9680/ using MCP Streamable HTTP transport.
Open the Macro Panel to access the console.
Build Site Images (WebP)
Docs use a splash image at /images/glyphs-app-mcp/glyphs-mcp.webp.
- Requirements: Node 20+ and the
sharppackage (npm i sharp). - Convert PNG assets from
content/images/glyphs-app-mcpto WebP inpublic/images/glyphs-app-mcp:
node scripts/convert-images.mjs
The script ensures glyphs-mcp.webp (the hero image for the doc) is generated, then converts the rest.
Contributing
PRs and feedback are welcome.
Contributors
- Thierry Charbonnel (@thierryc) — Author
- Florian Pircher (@florianpircher)
- Georg Seifert (@schriftgestalt)
- Jeremy Tribby (@jpt)