Product plugins that add model-visible request context without defining a tool. workspace-context is included by the default dsh-agent-spine-demo bundle and can be disabled through bundle config; time-context is opt-in, while the standard TUI and ACP bundles compose session-reference explicitly.

Package	Role	ctx key
`session-reference/`	Bounded current-surface snapshots of other sessions	`ctx.sessionReferences`
`time-context/`	Durable per-step current time and elapsed-time context	(none)
`workspace-context/`	`AGENTS.md`/`CLAUDE.md` workspace context loader	(listens on `agent/session-prefix` + `tools/post-execute`)

The workspace-context decision record explains its per-agent/session isolation and lifecycle split.