The Glyphic server is an MCP-compliant diagram generation tool that renders declarative JSON into visual diagrams, returned as inline images.
Tools Available
get_schema – Retrieve the full JSON schema so the AI knows all supported diagram types and fields.
render_diagram – Validate and render a JSON diagram definition, returning output as PNG, SVG, and/or React Flow JSON.
Supported Diagram Types
Flowchart / Architecture – Node-and-edge diagrams with shapes, icons, grouping, and flexible edge routing.
Sequence – Participant interaction diagrams with sync, async, and return message types.
ERD – Database schema diagrams with attributes, keys, and crow's-foot cardinality.
Class – UML class diagrams with attributes, methods, and relationship types.
State Machine – State transition diagrams with initial, final, and composite states.
Mindmap – Hierarchical idea maps with node shapes.
Gantt – Project timeline charts with sections, tasks, dependencies, and date formats.
Sankey – Flow/weight diagrams showing resource or data movement between nodes.
Git Graph – Branch and commit history visualizations.
C4 – Architecture context diagrams (person, system, container, boundary elements).
Pie Chart – Slice-based data charts with optional explode and legend.
Quadrant Chart – 2D scatter plots divided into four quadrants.
Timeline – Linear chronological event diagrams.
Journey Map – User journey diagrams with satisfaction scores per task.
Kanban – Board-style columns with cards, priorities, and assignees.
Treemap – Hierarchical area-proportional charts.
Canvas – Free-form SVG-based drawing with primitives (rect, circle, line, text, path, polygon, etc.).
Key Features
Export formats: PNG, SVG, and React Flow JSON.
Theming: named presets (light, dark, pastel, mono) or fully custom colors and fonts.
Visual style presets: compact, clean, minimal, sketch.
Layout directions (TB, BT, LR, RL) and edge routing (orthogonal, polyline, splines).
Files auto-saved to ~/Desktop/Glyphic Diagrams/ (configurable via GLYPHIC_OUTPUT_DIR or disabled with GLYPHIC_NO_SAVE).
Returns diagrams inline as base64 PNG even if local file saving fails or is disabled.
Schema validation before rendering ensures clean, actionable error messages.
Runs over stdio via npx — no global install required.
The official Model Context Protocol server for Glyphic. It lets MCP-capable clients — Claude Desktop, Cursor, and others — generate diagrams as a native tool: the model emits JSON, the tool renders it, and the image comes back inline.
The server runs over stdio via npx — no global install. Add this entry to
your client's MCP config:
{
"mcpServers": {
"glyphic": {
"command": "npx",
"args": ["-y", "@glyphicjs/mcp-server"]
}
}
}Most clients use exactly that; the difference is where the config lives and a couple of key names:
Client | Config location | Notes |
Claude Desktop |
| Fully quit (⌘Q) and reopen. |
Claude Code | — |
|
Cursor |
| Enable under Settings → MCP. |
VS Code |
| Top-level key is |
Windsurf |
| Reload servers from Cascade. |
Antigravity |
| Or Manage MCP Servers → View raw config. |
See the full MCP guide for the exact per-client JSON. Restart the client, then just ask:
"Draw an ERD for a blog: users, posts, and comments with the right relationships."
The model calls render_diagram, the diagram is saved locally, and the PNG is returned in the conversation.
Related MCP server: fcp-drawio
Tool | Description |
| Returns the full JSON Schema of a diagram input, so the model knows every supported type and field. |
| Validates the supplied |
By default, rendered files are written to ~/Desktop/Glyphic Diagrams/, named
<sanitized_title>_<timestamp>_<6-hex-chars>.png / .svg / .json, so the model
can tell the user exactly where to find them.
Two environment variables control this:
GLYPHIC_OUTPUT_DIR — overrides the output directory. Use an absolute
path — many MCP clients launch the server with cwd=/.
GLYPHIC_NO_SAVE — set to 1 or true to disable file saving entirely;
the tool still returns the diagram inline.
If writing to disk fails (e.g. a headless or read-only environment), the server logs a warning to stderr and still returns the diagram inline as base64 PNG — it never fails a render just because a file couldn't be saved. On startup, the server prints a short banner to stderr with its version, docs/issues links, and the resolved output directory.
Input is validated with @glyphicjs/schema before rendering — malformed model output comes back as a clean, fixable error rather than a crash, and error messages never leak stack traces.
Choose outputs with exportFormat in the diagram JSON, e.g. "exportFormat": ["png", "svg", "react-flow"] (defaults to ["png"]).
See the full MCP guide and the diagram types reference.
Sponsor: github.com/sponsors/MS-Teja
MIT
Unclaimed servers have limited discoverability.
If you are the server author, to access and configure the admin panel.
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