ctx.cat Documentation

ctx.cat shares encrypted context and coding-agent sessions through a browser link. Private content and its decryption key stay separate: the service stores ciphertext, while the reader key remains in the URL fragment.

Start Here

• CLI and public package install: exact Codex handoff and lifecycle commands
• HTTP API and compatibility headers
• Private-sharing boundary
• Exact and generic session upload behavior
• Local MCP reader and renderer
• Agent-readable index

Current Support

The hosted browser and API are available. The public @synthlabs/ctx-cat-client@0.4.11 package bytes are MIT-licensed, while the source repository remains private. Authenticated portable Codex 0.147 shares can expose a nonce-bound ctxcat codex continue command that creates a recipient-owned local continuation; public 0.147 sender emission is enabled in client 0.4.11 only for official interactive Codex TUI paginated lineages. codex exec emits legacy history; other headless sessions are unsupported. The pinned Codex 0.144.4 exact-session handoff uses ctxcat share <full-codex-session-id> and ctxcat resume; it is acceptance-proven. A manual teammate canary, cross-version Codex support, and native Claude continuation remain unaccepted.