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Shuttle: v0.56.0 update

Configure instance size via macro

On the Pro tier and above, you can now configure the compute instance size with the runtime macro. Read more on the docs!

:::rust
#[shuttle_runtime::main(instance_size = "m")] // 1 vCPU, 2 GB RAM
async fn main() -> ShuttleAxum {
    ...
}

Shuttle MCP server

The CLI now packs a built-in MCP server with tools for searching docs and executing basic shuttle commands. For example, use it in Cursor by configuring its settings:

:::json
{
  "mcpServers": {
    "shuttle": {
      "command": "shuttle",
      "args": ["mcp", "start"]
    }
  }
}

Other updates

  • In workspaces, the CLI now looks for the first binary entrypoint file with a fully qualified #[shuttle_runtime::main] macro inside. This drops the requirement that binaries for Shuttle must match the crate name!
    • ⚠️ This is a breaking change if you use #[main] with use shuttle_runtime::main;.
  • Added global option --output json to print the main command output as raw JSON responses straight from the API client. Useful for writing scripts.
    • ⚠️ This includes breaking changes in the shuttle-api-client crate
    • ⚠️ The generate command’s --output argument was renamed to --output-file
  • --name and --id are now separate arguments (instead of aliases) for specifying the project name and id respectively
  • The init command can now take the --id [project_id] arg to link to an existing project right after generating the files
  • Deployment archive no longer packs Secrets.toml or any override via --secrets as they are not used when building
  • Improved the API client’s handling of 4xx and 5xx responses
  • CLI will now warn if it detects a lowercase ‘shuttle.toml’ file

Upgrading

Refer to the upgrading docs for how to upgrade your projects.

What's Changed

New Contributors

Full Changelog: https://github.com/shuttle-hq/shuttle/compare/v0.55.0...v0.56.0

Source: README.md, updated 2025-07-02