CatGo Structure Editor

This package is the prebuilt local MCP runtime for CatGo's Codex structure editor. Version: 0.2.8. Requires Python 3.10+ available as python3 and a desktop host supporting MCP Apps and file entrypoints. No CatGo server or account is required.

Install from the GitHub marketplace:

codex plugin marketplace add Hello-QM/catgo-codex-plugin
codex plugin add catgo-editor@catgo

Refresh plugin connections or start a new chat, then open a CIF/XYZ/POSCAR file. The 3D viewer supports coordinate editing, undo/redo, version-checked host Save, copy import/export and Miller-index slab cutting through Build Tools → Slab. Extensionless POSCAR/CONTCAR can be imported through Open. Imported copies use Export, while Save requires a writable host resource with a version token.

The Python server only serves packaged UI and resources. Host file reads/writes use the Codex bridge. The editor and WASM run inside the app surface; explicitly sending selection adds selected atoms to the model context. Host data handling continues to apply. The plugin has no separate telemetry service.

Source, complete installation guidance, verification boundaries and issue reporting: https://github.com/Hello-QM/catgo-codex-plugin

Core CatGo code retains AGPL-3.0-or-later. Third-party components retain their own notices in THIRD_PARTY_NOTICES.md and third_party/. Corresponding viewer and scalar WASM Rust source is included in the repository's vendor/catgo directory. This is a GitHub marketplace distribution, not an approved OpenAI Directory listing.