Collections now have an **"Available to the research agent"** toggle (default on). Turn it off to keep a collection out of the LangGraph research agent's tool list when it isn't needed for agentic research — without deleting it or changing its privacy/egress classification. The flag is exposed on the collection create form and the collection details page, persists via the collections API, and is enforced where the agent builds its specialized search tools (a disabled collection's name never reaches the agent).
