Cross Agent Session Resumer

casr

Cross Agent Session Resumer for coding agents: resume a session created in one provider (Claude Code, Codex, Gemini, and more) using a different provider by converting through a canonical session model.

  

Quick Install (Recommended)

curl -fsSL "https://raw.githubusercontent.com/Dicklesworthstone/cross_agent_session_resumer/main/install.sh?$(date +%s)" | bash

That installer is the primary distribution path. It handles platform detection, secure artifact verification, fallback source builds, shell completions, and agent-oriented local setup in one step.

TL;DR

**The Problem**: AI coding sessions are siloed by provider. A useful Codex session cannot be resumed directly in Claude Code, and vice versa.

**The Solution**: `casr` discovers a session across installed providers, reads it into a canonical IR, writes a native session file for your target provider, verifies read-back fidelity, and prints the exact resume command.

Why Use casr?

Feature	What It Does
Cross-provider resume	casr cc resume and similar conversions in one command
Canonical IR	Normalizes provider formats into a common model, then exports back to native format
Native-format writers	Produces plausible provider-native session files, not intermediate-only exports
Safety-first writes	Atomic temp-then-rename writes, conflict detection, optional .bak backup with --force
Provider auto-detection	Finds which provider owns a session ID without user guesswork
Verification step	Re-reads written output to catch writer bugs before you try to resume
Machine-friendly output	--json mode