# 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](/docs/cli): exact Codex handoff and
  lifecycle commands
- [HTTP API and compatibility headers](/docs/api)
- [Private-sharing boundary](/docs/security)
- [Exact and generic session upload behavior](/docs/session-upload)
- [Local MCP reader and renderer](/docs/mcp)
- [Agent-readable index](/llms.txt)

## 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.