Function handler

packages/effect/src/unstable/ai/McpServer.ts:1750–1768

(
        input: string,
        context: CompletionContext
      )

    for (const [param, handle] of Object.entries(options.completion ?? {})) {
      const encodeArray = Schema.encodeUnknownEffect(Schema.Array(params[param]))
      const handler = (
        input: string,
        context: CompletionContext
      ) =>
        handle(input, context).pipe(
          Effect.flatMap(encodeArray),
          Effect.map((values) => ({
            completion: {
              values: values as Array<string>,
              total: values.length,
              hasMore: false
            }
          })),
          Effect.catchCause((cause) => {
            const prettyError = Cause.prettyErrors(cause)[0]
            return Effect.fail(new InternalError({ message: prettyError.message }))
          }),
          Effect.provideContext(services)
        )
      completions[param] = handler
    }
    yield* registry.addResourceTemplate({