Casr

Cross Agent Session Resumer. Convert and resume sessions across Claude Code, Codex, Gemini, and other providers.From its SKILL.md

Install

npx -y skills add JordanChoo/acfs-agent-skills --skill casr

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SKILL.md

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casr — Cross Agent Session Resumer

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

Fast Path

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

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.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.