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1-2 of 2agent-sdk/tool-search Changed · +2 / -2 lines
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1414Tool search is on by default, with the exceptions listed in [Configure tool search](#configure-tool-search).
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16When it is active, tool definitions are withheld from the context window. The agent receives a summary of available tools and searches for relevant ones when the task requires a capability not already loaded. Up to five of the most relevant tools are loaded into context by default, where they stay available for subsequent turns. When the SDK compacts earlier messages to free space, it keeps the discovered tools loaded.
16When it is active, tool definitions are withheld from the context window. The agent receives a summary of available tools and searches for relevant ones when the task requires a capability not already loaded. Up to five of the most relevant tools are loaded into context by default, where they stay available for subsequent turns until the SDK compacts the messages where the agent discovered them. After that compaction, the agent searches for those tools again when it next needs them.
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18Tool search adds one extra round-trip the first time Claude discovers a tool (the search step), but for large tool sets this is offset by smaller context on every turn. With fewer than \~10 tools whose definitions fit comfortably in the context window, loading everything upfront is typically faster.
18Tool search adds one extra round-trip each time Claude searches for tools, but for large tool sets this is offset by smaller context on every turn. With fewer than \~10 tools whose definitions fit comfortably in the context window, loading everything upfront is typically faster.
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2020For details on the underlying API mechanism, see [Tool search in the API](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool).
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2323* **QEMU and UEFI firmware**: `qemu-system-x86`, `ovmf`, and `virtiofsd` on x86\_64, or `qemu-system-arm`, `qemu-efi-aarch64`, and `virtiofsd` on arm64. `apt install claude-desktop` installs them by default as recommended packages. If you installed with `--no-install-recommends`, or your system is a minimal image that skips recommended packages, the Cowork tab reports "Cowork requires QEMU" and shows the `apt install` command to run. Ubuntu 22.04 has no `virtiofsd` package; the app uses a bundled copy there.
2424* **Access to `/dev/kvm`**: add your user to the `kvm` group with `sudo usermod -aG kvm $USER`, then log out and back in. Some desktop environments grant the logged-in user access to `/dev/kvm` without the group, but Cowork also needs `/dev/vhost-vsock`, which only `kvm` group members can open. Join the group even if `/dev/kvm` already works for you.
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26The app checks these requirements once at launch: restart it after installing packages, and log out and back in after joining the group. If your kernel has no module directory under `/lib/modules`, which is common on ChromeOS and in container-based Linux environments, the Cowork tab reports that the kernel doesn't include the virtualization support Cowork needs and that it can't be added manually.
26The app checks these requirements once at launch: restart it after installing packages, and log out and back in after joining the group. If `/dev/vhost-vsock` is missing and your running kernel has no module directory under `/lib/modules`, the Cowork tab reports that the kernel doesn't include the virtualization support Cowork needs and that it can't be added manually. This combination is common on ChromeOS and in container-based Linux environments.
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2828## Install
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