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feat(mcp): add load_diagram tool to load .drawio files into the session (#893)

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* feat(mcp): add load_diagram tool to load .drawio files into the session

Loading a file previously required the agent to read the file itself and
pass the entire XML through create_new_diagram - wasteful for large
diagrams and impossible for draw.io's compressed save format.

load_diagram takes a file path; the server reads it, decompresses any
compressed pages (base64 -> raw deflate -> URI-decode, per page), and
replaces the session document. The loaded XML is deliberately NOT marked
as seen by the edit gate: the model only supplied a path, so it must
call get_diagram once before editing.

* chore(mcp): version 0.2.3

* fix(mcp): report package.json version in the MCP handshake

The McpServer metadata version was a separate hardcoded string that
never matched the published version (stuck at 0.1.2, then 0.3.0 while
npm shipped 0.2.x). Read it from package.json at startup instead —
works from both src/ (tsx) and dist/ (published build).
This commit is contained in:
Dayuan Jiang
2026-07-12 19:54:42 +09:00
committed by GitHub
parent f3a85558d8
commit 4b07228320
7 changed files with 369 additions and 6 deletions
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packages/mcp-server/README.md
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@@ -116,9 +116,14 @@ Use the standard MCP configuration with:
|------|-------------|
| `start_session` | Opens browser with real-time diagram preview |
| `create_new_diagram` | Create a new diagram from XML (requires `xml` argument) |
| `load_diagram` | Load a `.drawio` file from disk into the session (handles compressed files) |
| `edit_diagram` | Edit diagram by ID-based operations (update/add/delete cells) |
| `get_diagram` | Get the current diagram XML |
| `export_diagram` | Save diagram to a `.drawio` file |
| `export_diagram` | Save diagram to a `.drawio`, `.png`, or `.svg` file |
| `list_pages` | List every page (tab) with id, name, index, and cell count |
| `add_page` | Append a new page without touching existing ones |
| `rename_page` | Rename a page |
| `delete_page` | Delete a page (refuses to delete the last one) |
## How It Works