> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cerca.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Tools

> Built-in runtime tools and fleet-owned external tools.

Tools are capabilities available to the model while a thread is running. Your app configures what the agent is allowed to use, then the runtime exposes the right tools to the model at execution time.

There are built-in tools for runtime work such as memory, web, sandbox, scheduling, orchestration, and artifacts. Configurable tools can be enabled by exact name or namespace wildcard, for example `sandbox.exec`, `web.*`, `memory.*`, or `agent.schedule.*`.

External tools are owned by a fleet. Each one lives under a namespace, such as `docs`, and exposes actions as full names like `docs.search`. The agent opts in with a namespace wildcard such as `docs.*`.

Large tool catalogs are kept out of the main context. The model discovers a ranked subset of relevant tools for the goal at hand, then calls the ones it actually needs.