# Casr

> Cross Agent Session Resumer. Convert and resume sessions across Claude Code, Codex, Gemini, and other providers. Use when switching AI agent providers mid-session or migrating an active chat history to a new tool.

- Skill: `majiayu000/casr-2` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add majiayu000/casr-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/casr-2/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/majiayu000/casr-2

---

# casr — Cross Agent Session Resumer

Use `casr` when you need to keep working on the same session but switch providers.

## Fast Path

```bash
casr list
casr info <session-id>
casr -cc <session-id>   # open in Claude Code
casr -cod <session-id>  # open in Codex
casr -gmi <session-id>  # open in Gemini
```

## Helpful Commands

```bash
casr providers
casr list --workspace "$(pwd)" --sort date --limit 20
casr cod resume <session-id> --source cc
casr info <session-id> --json
```

## Notes

- `casr list` is project-scoped to your current working directory by default.
- `-cc`, `-cod`, and `-gmi` auto-detect source provider from the session ID.
- Use `--json` output mode for automation.