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nmassi

glyphs-mcp

by nmassi
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Python
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MCP bridge for AI-assisted type design in GlyphsApp.

Lets Claude, Cursor, or any MCP client read and write font data directly in GlyphsApp — bidirectional, real-time, live in the editor.

MCP Client  ←(stdio/MCP)→  MCP Server  ←(HTTP/localhost)→  GlyphsApp Plugin

Requirements

Installation

1. Install the GlyphsApp plugin

From Plugin Manager (recommended): Open GlyphsApp, go to Window > Plugin Manager, search for MCP, and click Install.

Manual install: Download GlyphsMCP.glyphsPlugin.zip from the latest release, unzip, and double-click to install.

Restart GlyphsApp. You should see GlyphsMCP under the Window menu.

2. Connect your MCP client

Claude Code:

claude mcp add glyphs-mcp -- uvx glyphs-mcp

Cursor / VS Code — add to your MCP config:

{
  "mcpServers": {
    "glyphs-mcp": {
      "command": "uvx",
      "args": ["glyphs-mcp"]
    }
  }
}

That's it.

3. Use it

Open a font in GlyphsApp, then ask your AI assistant:

"Run a full color audit on my font and tell me which glyphs are inconsistent"

"Compare the stems across all my lowercase letters"

"Check if my figures are consistent with my letters"

"Make the R 20% wider and harmonize the curves"

"Analize metrics on lowercases"

Tools

Read

Tool

Description

get_font_info

Font family name, UPM, glyph count, masters, axes, metrics, instances

list_glyphs

All glyph names with unicode, category, layer count

get_glyph

Full glyph data: paths, components, anchors, sidebearings for all layers

get_glyph_svg

Glyph rendered as SVG markup

get_selection

Current editor selection: active glyph, layer, selected paths/nodes

get_masters

All masters with metrics and axis positions

get_kerning

All kerning pairs for a master

get_features

OpenType feature code

Write

Tool

Description

create_glyph

Create a new glyph with optional width, unicode, and initial paths

set_glyph_paths

Replace all paths on a glyph's layer

set_glyph_width

Set advance width

set_glyph_color

Set color label (0-11)

set_glyph_unicode

Assign or clear a unicode value

rename_glyph

Rename a glyph

duplicate_glyph

Copy a glyph with all layers to a new name

delete_glyph

Delete a glyph

set_kerning_pair

Add or modify a kerning pair

delete_kerning_pair

Remove a kerning pair

set_feature_code

Create or update an OpenType feature

Analysis

Tool

Description

measure_stems

Measure stem thicknesses via perpendicular ray-casting

compare_stems

Compare stems across glyphs using industry patterns

get_stem_targets

Designer's intended stem values from Dimensions palette

measure_color

Measure ink density for a single glyph

compare_color

Compare ink density across glyphs

audit_font_color

Full font color audit across all letters

check_overshoots

Overshoot consistency at baseline, x-height, cap-height

compare_proportions

Width ratios, related-form groups, ordering constraints

check_diagonal_weights

Diagonal stem thickness vs straight reference

check_junctions

Stem thinning at arch/bowl junctions

check_related_forms

Cross-validate figures and letters (0/O, 6/9, 8/S, 3/B)

check_punctuation

Mirrored pair widths, dash ratios, related punctuation

check_compatibility

Master compatibility: paths, nodes, components, anchors

analyze_kerning

Kerning quality: cross-master gaps, orphans, outliers

analyze_spacing

Spacing quality: sidebearing groups, symmetry, drift

Analysis tools automatically mark glyphs in GlyphsApp: red = inconsistent, orange = unreliable, yellow = optical compensation, green = pass.

RMX Tools

Requires RMX Tools for full functionality. Falls back to native transforms when RMX is unavailable.

Tool

Description

rmx_harmonize

Optimize bezier curves

rmx_scale

Scale by percentage with stroke weight compensation

rmx_tune

Adjust weight, width, height, or slant

rmx_monospace

Adjust a glyph to a fixed advance width

rmx_batch

Apply any RMX filter to multiple glyphs

Advanced

Tool

Description

execute_in_glyphs

Run arbitrary Python inside GlyphsApp (disabled by default)

Multi-master support

All tools accept an optional master_id parameter. When omitted, read/write tools use the first master. Analysis tools analyze all masters and return per-master results.

Menu

The plugin adds a GlyphsMCP submenu under Window in the menu bar:

  • Start/Stop Server — toggle the HTTP server

  • Connect — copy ready-to-paste MCP config for Claude Code or VS Code (and forks)

  • Documentation — open this page in your browser

  • Allow Execute Endpoint — enable execute_in_glyphs (off by default for security)

Preferences

Key

Default

Description

com.nico.glyphs-mcp.port

7745

HTTP server port

com.nico.glyphs-mcp.autostart

true

Start server on GlyphsApp launch

com.nico.glyphs-mcp.allowExecute

false

Enable the execute endpoint

How it works

The GlyphsApp plugin runs an HTTP server on 127.0.0.1:7745 inside GlyphsApp. All GlyphsApp API calls run on the main thread via a queue + NSTimer bridge for thread safety.

The MCP server is a thin translation layer — it receives MCP tool calls via stdio and forwards them as HTTP requests to the plugin.

Roadmap

  • Font proofing — Generate proof strings for spacing/kerning evaluation

  • Auto-update — Check for updates directly from the GlyphsMCP menu

  • Analytics — Optional usage telemetry to guide development priorities

License

MIT — Nicolas Massi www.nico.works

This server cannot be installed

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maintenance

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Maintenance

–Maintainers
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2dRelease cycle
4Releases (12mo)

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