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Lesson 36
6 min
CASR: Cross-Agent Sessions
Resume coding sessions across AI providers seamlessly
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Mark complete to track your learning progress.
Resume coding sessions across AI providers seamlessly
Mark complete to track your learning progress.
Resume coding sessions across AI providers with Cross-Agent Session Resumer.
CASR (Cross-Agent Session Resumer) converts and resumes AI coding sessions across different providers. Start a session in Claude Code, continue it in Codex CLI, and pick it back up in Antigravity CLI without losing context.
CASR extracts conversation context, code changes, and decisions into a portable format that any agent can ingest. This enables provider-hopping when you hit rate limits or want a second opinion.
Convert sessions between Claude, Codex, and Antigravity
Decisions, code changes, and rationale carry over
Resume mid-task without re-explaining context
Switch providers instantly when throttled
# Find the Claude Code session you were working incasr list --provider claude-code# Preview the conversion without writing anythingcasr resume cod <session-id> --dry-run# Convert it and resume in Codex CLIcasr resume cod <session-id># Target aliases: cc, cod, gmi, agy, cur, cln, aid, amp, opc, gpt
Step through the full session handoff pipeline. Watch an agent session get captured, distilled, and injected into a new agent with animated token compression and context flow.
Session Handoff Pipeline
ClaudeCodex
CASR discovers the current agent's session on disk: every conversation turn, tool call, file edit, and reasoning trace the provider recorded.
Refactoring auth middleware to support OAuth2 PKCE flow