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yoi/resources/plugin/templates/rust-component-tool/README.md

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Rust Component Tool Template

This is the embedded starter template for a Yoi Component Model Tool Plugin written with the first-party Rust PDK.

What this template demonstrates

  • wasm-component runtime targeting yoi:plugin/tool@1.0.0.
  • Guest-side WIT binding generation through the PDK's wit_bindgen re-export.
  • Typed JSON input parsing through run_json_tool via export_component_tool!.
  • Typed JSON output serialization with ToolOutput::json.
  • Structured, bounded ToolError output for user-visible Tool failures.

The PDK is guest-side only. It does not grant filesystem, network, or environment authority. Host-side Plugin manifests and grants remain the authority boundary for Tool execution and host APIs.

Checkout/development dependency

Inside the Yoi checkout this template uses a local path dependency and declares an empty [workspace] so it can be checked in place without becoming a member of Yoi's root workspace:

yoi-plugin-pdk = { path = "../../../../crates/plugin-pdk" }

If this template is copied elsewhere before crates.io publication exists, pin a Yoi source revision instead of fetching an unpinned remote template:

yoi-plugin-pdk = { git = "https://github.com/example/yoi.git", package = "yoi-plugin-pdk", rev = "<pinned-yoi-revision>" }

Crates.io publication, remote template fetching, and yoi plugin new/check/pack are intentionally deferred to later authoring-tooling work.

Next steps

  1. Replace package/plugin ids, names, descriptions, and Tool schema.
  2. Replace EchoInput / EchoOutput and handle_echo with your Tool logic.
  3. Build a component for wasm32-unknown-unknown with the Component Model tooling used by your environment.
  4. Package plugin.toml and plugin.component.wasm into a .yoi-plugin archive.
  5. Use yoi plugin list / yoi plugin show plus focused runtime tests to inspect and validate the package.

The exact component build/pack command is not part of this template yet because deterministic yoi plugin new/check/pack authoring commands are a separate planned Ticket.