Starlark FAQs

Question 1

What is Starlark and its primary function?

Accepted Answer

Starlark is a lightweight, Starlark-powered meta-server specifically designed for MCP (Model Context Protocol) environments. Its primary function is to enable dynamic loading and execution of custom tools written as Starlark scripts.

Question 2

What is MCP (Model Context Protocol) and how does Starlark interact with it?

Accepted Answer

MCP stands for Model Context Protocol, a standard for communication within certain environments. Starlark acts as an MCP server, communicating via JSON-RPC 2.0 over standard I/O (stdio) to receive requests and execute tools based on the MCP specification.

Question 3

How does Starlark enable dynamic tool loading?

Accepted Answer

Starlark allows developers to define and load new tools by simply placing `.star` script files into a designated directory. These extensions are automatically detected and made available to the MCP server without requiring a server restart, offering extreme flexibility.

Question 4

What communication protocols does Starlark utilize?

Accepted Answer

Starlark implements the JSON-RPC 2.0 protocol for structured message exchange. It uses stdio (standard input/output) as the transport layer, allowing for seamless integration and communication within an existing MCP setup.

Question 5

How do I write custom tools or extensions for Starlark?

Accepted Answer

Extensions are written as `.star` files using Starlark's simple, Python-like syntax. You define tool handler functions and register them using the `Extension` and `Tool` objects within a `describe_extension()` function, which the server then loads dynamically.

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