> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/relay/dev/reference/api/rust-library-reference/nemo-relay-plugin-host/composition/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/nemo/relay/_mcp/server.

# Module composition

> Built-in plugin composition supplied by the host or embedding application.

Generated from `cargo doc --no-deps -p nemo-relay-builtins -p nemo-relay-diagnostics -p nemo-relay-logging -p nemo-relay-plugin-host -p nemo-relay-codecs -p nemo-relay -p nemo-relay-runtime -p nemo-relay-model-pricing -p nemo-relay-resource-metrics -p nemo-relay-observability -p nemo-relay-adaptive -p nemo-relay-pii-redaction -p nemo-relay-ffi -p nemo-relay-types -p nemo-relay-plugin -p nemo-relay-worker-proto -p nemo-relay-worker`.

Built-in plugin composition supplied by the host or embedding application.

## Structs

* [HostServices](/reference/api/rust-library-reference/nemo-relay-plugin-host/composition/struct-hostservices): Services supplied by plugin-host or the embedding application.

## Functions

* [install_builtin_extensions](/reference/api/rust-library-reference/nemo-relay-plugin-host/composition/fn-install-builtin-extensions): Install additional default components before querying the default host. The first composition selected by the embedding application is preserved.
* [install_host_services](/reference/api/rust-library-reference/nemo-relay-plugin-host/composition/fn-install-host-services): Install host composition once, preserving the chosen application.

> Built-in plugin composition supplied by the host or embedding application.

## Docs

- [Struct Host Services](https://docs.nvidia.com/nemo/relay/dev/reference/api/rust-library-reference/nemo-relay-plugin-host/composition/struct-hostservices.md): Services supplied by plugin-host or the embedding application.
- [Function install_builtin_extensions](https://docs.nvidia.com/nemo/relay/dev/reference/api/rust-library-reference/nemo-relay-plugin-host/composition/fn-install-builtin-extensions.md): Install additional default components before querying the default host. The first composition selected by the embedding application is preserved.
- [Function install_host_services](https://docs.nvidia.com/nemo/relay/dev/reference/api/rust-library-reference/nemo-relay-plugin-host/composition/fn-install-host-services.md): Install host composition once, preserving the chosen application.