import * as Cause from "effect/Cause";import * as Context from "effect/Context";import * as Effect from "effect/Effect";import * as Layer from "effect/Layer";import * as Option from "effect/Option";import * as Sink from "effect/Sink";import * as Stream from "effect/Stream";import type * as Types from "effect/Types";import { McpSchema, McpServer, Tool } from "effect/unstable/ai";import { HttpRouter, HttpServerRequest, HttpServerResponse } from "effect/unstable/http"; import packageJson from "../../package.json" with { type: "json" };import * as McpInvocationContext from "./McpInvocationContext.ts";import * as McpSessionRegistry from "./McpSessionRegistry.ts";import * as PreviewAutomationBroker from "./PreviewAutomationBroker.ts";import {  PreviewSnapshotToolkitHandlersLive,  PreviewStandardToolkitHandlersLive,} from "./toolkits/preview/handlers.ts";import {  PreviewSnapshotTool,  PreviewSnapshotToolkit,  PreviewStandardToolkit,} from "./toolkits/preview/tools.ts"; const unauthorized = HttpServerResponse.jsonUnsafe(  {    error: "invalid_mcp_credential",    message: "A valid provider-scoped MCP bearer credential is required.",  },  {    status: 401,    headers: {      "cache-control": "no-store",      "www-authenticate": "Bearer",    },  },); type AuthenticatedHttpEffect = Effect.Effect<  HttpServerResponse.HttpServerResponse,  Types.unhandled,  McpInvocationContext.McpInvocationContext>; type McpAuthMiddleware = (  httpEffect: AuthenticatedHttpEffect,) => Effect.Effect<  HttpServerResponse.HttpServerResponse,  Types.unhandled,  HttpServerRequest.HttpServerRequest>; export const normalizeMcpHttpResponse = (  response: HttpServerResponse.HttpServerResponse,): HttpServerResponse.HttpServerResponse => {  const bodyIsEmpty =    response.body._tag === "Empty" ||    (response.body._tag === "Uint8Array" && response.body.contentLength === 0) ||    (response.body._tag === "Raw" && response.body.contentLength === 0);  return response.status === 200 && bodyIsEmpty    ? HttpServerResponse.setStatus(response, 202)    : response;}; const makeMcpAuthMiddleware = McpSessionRegistry.McpSessionRegistry.pipe(  Effect.map(    (registry): McpAuthMiddleware =>      Effect.fn("McpHttpServer.authenticateRequest")(function* (httpEffect) {        const request = yield* HttpServerRequest.HttpServerRequest;        const authorization = request.headers.authorization;        const token =          authorization?.startsWith("Bearer ") === true            ? authorization.slice("Bearer ".length).trim()            : "";        const invocation = yield* registry.resolve(token);        if (!invocation) return unauthorized;        return yield* httpEffect.pipe(          Effect.provideService(McpInvocationContext.McpInvocationContext, invocation),          Effect.map(normalizeMcpHttpResponse),        );      }),  ),  Effect.withSpan("McpHttpServer.makeAuthMiddleware"),); const McpAuthMiddlewareLive = HttpRouter.middleware<{  provides: McpInvocationContext.McpInvocationContext;}>()(makeMcpAuthMiddleware).layer; const previewSnapshotFailure = <E>(cause: Cause.Cause<E>) => {  if (Cause.hasInterrupts(cause) || cause.reasons.some(Cause.isDieReason)) {    return Effect.failCause(cause).pipe(Effect.orDie);  }  const failures = cause.reasons.filter(Cause.isFailReason);  const firstFailure = failures[0]?.error;  const errorTag =    typeof firstFailure === "object" &&    firstFailure !== null &&    "_tag" in firstFailure &&    typeof firstFailure._tag === "string"      ? firstFailure._tag      : "PreviewSnapshotError";  const result = new McpSchema.CallToolResult({    isError: true,    structuredContent: {      error: {        _tag: errorTag,        operation: "snapshot",        failureCount: failures.length,      },    },    content: [{ type: "text", text: "Preview snapshot failed." }],  });  return Effect.logWarning("preview snapshot failed", {    operation: "snapshot",    errorTag,    failureCount: failures.length,  }).pipe(Effect.as(result));}; const registerPreviewSnapshot = Effect.fn("McpHttpServer.registerPreviewSnapshot")(function* () {  const server = yield* McpServer.McpServer;  const broker = yield* PreviewAutomationBroker.PreviewAutomationBroker;  const built = yield* PreviewSnapshotToolkit;  const tool = PreviewSnapshotTool;  yield* server.addTool({    tool: new McpSchema.Tool({      name: tool.name,      description: Tool.getDescription(tool),      inputSchema: Tool.getJsonSchema(tool),      annotations: {        ...Context.getOption(tool.annotations, Tool.Title).pipe(          Option.map((title) => ({ title })),          Option.getOrUndefined,        ),        readOnlyHint: Context.get(tool.annotations, Tool.Readonly),        destructiveHint: Context.get(tool.annotations, Tool.Destructive),        idempotentHint: Context.get(tool.annotations, Tool.Idempotent),        openWorldHint: Context.get(tool.annotations, Tool.OpenWorld),      },    }),    annotations: tool.annotations,    handle: (payload) =>      Effect.withFiber((fiber) => {        const invocation = Context.getUnsafe(          fiber.context,          McpInvocationContext.McpInvocationContext,        );        return built.handle("preview_snapshot", payload).pipe(          Stream.unwrap,          Stream.run(Sink.last()),          Effect.flatMap(Effect.fromOption),          Effect.provideService(PreviewAutomationBroker.PreviewAutomationBroker, broker),          Effect.provideService(McpInvocationContext.McpInvocationContext, invocation),          Effect.matchCauseEffect({            onFailure: previewSnapshotFailure,            onSuccess: ({ encodedResult }) => {              const snapshot = encodedResult as {                readonly screenshot: {                  readonly mimeType: "image/png";                  readonly data: string;                  readonly width: number;                  readonly height: number;                };                readonly [key: string]: unknown;              };              const { screenshot, ...page } = snapshot;              const metadata = {                ...page,                screenshot: {                  mimeType: screenshot.mimeType,                  width: screenshot.width,                  height: screenshot.height,                },              };              return Effect.succeed(                new McpSchema.CallToolResult({                  isError: false,                  structuredContent: metadata,                  content: [                    { type: "text", text: JSON.stringify(metadata) },                    {                      type: "image",                      data: new Uint8Array(Buffer.from(screenshot.data, "base64")),                      mimeType: screenshot.mimeType,                    },                  ],                }),              );            },          }),        );      }),  });}); const PreviewStandardToolkitRegistrationLive = McpServer.toolkit(PreviewStandardToolkit).pipe(  Layer.provide(PreviewStandardToolkitHandlersLive),); const PreviewSnapshotRegistrationLive = Layer.effectDiscard(registerPreviewSnapshot()).pipe(  Layer.provide(PreviewSnapshotToolkitHandlersLive),); export const PreviewToolkitRegistrationLive = Layer.mergeAll(  PreviewStandardToolkitRegistrationLive,  PreviewSnapshotRegistrationLive,); const McpTransportLive = McpServer.layerHttp({  name: "T3 Code",  version: packageJson.version,  path: "/mcp",}).pipe(Layer.provide(McpAuthMiddlewareLive)); export const layer = PreviewToolkitRegistrationLive.pipe(Layer.provideMerge(McpTransportLive));