PTY stands for pseudo-terminal. This capability provides persistent, owner-scoped terminal sessions for workflows that require state across tool calls or interactive stdin. PTY complements the one-shot bash and filesystem tools; it does not replace their stronger per-operation contracts.

Package	Role	ctx key
`pty` (`@deepseek-ai/dsh-terminal`)	Backend registry, branded ids, exact-Agent ownership, session operations, and awaited cleanup	`ctx.terminals`
`terminal-bash` (`@deepseek-ai/dsh-terminal-bash`)	Shell backend over `ctx.subprocess.spawnTerminal`: readiness detection, bounded terminal state, sandbox policy, and session operations	registers on `ctx.terminals`
`tool-terminal` (`@deepseek-ai/dsh-tool-terminal`)	Six model-facing tools and generic task integration for background sends	registers on `ctx.tools`

The terminal subsystem reference owns ids, backend and session contracts, send readiness, and bounded reads. The persistent PTY Agent Note owns the rationale and deferred boundaries.