> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pluxx.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Compatibility Caveats

This page summarizes caveats from the extension-system research matrix.

## Cross-host matrix (concise)

| Area                         | Claude Code              | Codex                     | Cursor                        | OpenCode                     |
| ---------------------------- | ------------------------ | ------------------------- | ----------------------------- | ---------------------------- |
| Primary project instructions | `CLAUDE.md`              | `AGENTS.md`               | `.cursor/rules/*.mdc`         | `AGENTS.md`                  |
| Plugin command model         | supported                | use `@plugin` + skills    | supported                     | supported                    |
| Hooks model                  | plugin + settings        | external hooks config     | hooks.json                    | plugin runtime hooks         |
| Skill limits (notable)       | short display truncation | 1024-char description cap | strict name/path expectations | plugin-managed skill loading |

## Generated compatibility matrix

For the generated repo-level support matrix, see [Compatibility / limits](/how-it-works/compatibility-limits).