import { Deferred, Effect, Option, Schema } from "effect";import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";import { WebStandardStreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/webStandardStreamableHttp.js"; import { jsonRpcErrorBody } from "@executor-js/host-mcp";import {  createExecutorMcpServer,  type ExecutorMcpServerConfig,} from "@executor-js/host-mcp/tool-server";import type { ResumeResponse } from "@executor-js/execution"; import { startIntegrationsRefresh } from "./integrations"; // ---------------------------------------------------------------------------// Streamable HTTP handler// --------------------------------------------------------------------------- export type McpRequestHandler = {  readonly handleRequest: (request: Request) => Promise<Response>;  readonly handleApprovalRequest: (request: Request) => Promise<Response>;  readonly close: () => Promise<void>;}; // Local serves these error bodies in-process; like the self-host store they are// INNER responses (no CORS) — byte-identical to the prior hand-rolled copy// (`content-type: application/json` only) via the canonical renderer.const jsonError = (status: number, code: number, message: string): Response =>  jsonRpcErrorBody(status, code, message, { cors: false }); const formatBoundaryError = (error: unknown): unknown => {  // oxlint-disable-next-line executor/no-instanceof-error, executor/no-unknown-error-message -- boundary: MCP request handler catches unknown SDK/runtime failures for process logging  if (error instanceof Error) return error.stack ?? error.message;  return error;}; type McpElicitationMode = "browser" | "model" | "native"; const MCP_ELICITATION_MODES = new Set<McpElicitationMode>(["browser", "model", "native"]);const ResumeResponsePayload = Schema.Struct({  action: Schema.Literals(["accept", "decline", "cancel"]),  content: Schema.optional(Schema.Record(Schema.String, Schema.Unknown)),});const decodeResumeResponsePayload = Schema.decodeUnknownOption(ResumeResponsePayload); const readElicitationMode = (request: Request): McpElicitationMode => {  const url = new URL(request.url);  const mode = url.searchParams.get("elicitation_mode");  if (mode && MCP_ELICITATION_MODES.has(mode as McpElicitationMode)) {    return mode as McpElicitationMode;  }   return "model";}; const approvalUrlForRequest = (  request: Request,  executionId: string,  sessionId: string | null,): string => {  const url = new URL(`/resume/${encodeURIComponent(executionId)}`, request.url);  if (sessionId) url.searchParams.set("mcp_session_id", sessionId);  return url.toString();}; const ignoreClose = (close: (() => Promise<void>) | undefined): Promise<void> =>  close    ? Effect.runPromise(        Effect.ignore(          Effect.tryPromise({            try: close,            catch: () => undefined,          }),        ),      )    : Promise.resolve(); const approvalRequestPattern = /^\/api\/mcp-sessions\/([^/?#]+)\/executions\/([^/?#]+)\/resume$/; const json = (value: unknown, status = 200): Response =>  new Response(JSON.stringify(value), {    status,    headers: { "content-type": "application/json" },  }); const readResumeResponse = (request: Request): Promise<ResumeResponse | null> =>  Effect.runPromise(    Effect.tryPromise({      try: () => request.json(),      catch: () => null,    }).pipe(      Effect.map((raw) =>        raw === null ? null : Option.getOrNull(decodeResumeResponsePayload(raw)),      ),    ),  ); const resumeApprovalResult = (executionId: string, response: ResumeResponse) => {  const textByAction = {    accept: "I've approved it",    decline: "I've denied it",    cancel: "I've canceled it",  } satisfies Record<ResumeResponse["action"], string>;  const statusByAction = {    accept: "approved",    decline: "denied",    cancel: "canceled",  } satisfies Record<ResumeResponse["action"], string>;   return {    status: "completed",    text: textByAction[response.action],    structured: { status: statusByAction[response.action], executionId },    isError: false,  };}; export const createMcpRequestHandler = (config: ExecutorMcpServerConfig): McpRequestHandler => {  const transports = new Map<string, WebStandardStreamableHTTPServerTransport>();  const servers = new Map<string, McpServer>();  const approvalResponses = new Map<string, Map<string, ResumeResponse>>();  const approvalWaiters = new Map<string, Map<string, Deferred.Deferred<ResumeResponse>>>();   const dispose = async (id: string, opts: { transport?: boolean; server?: boolean } = {}) => {    const t = transports.get(id);    const s = servers.get(id);    transports.delete(id);    servers.delete(id);    approvalResponses.delete(id);    approvalWaiters.delete(id);    if (opts.transport) await ignoreClose(t ? () => t.close() : undefined);    if (opts.server) await ignoreClose(s ? () => s.close() : undefined);  };   return {    handleRequest: async (request) => {      const sessionId = request.headers.get("mcp-session-id");       if (sessionId) {        const transport = transports.get(sessionId);        if (!transport) return jsonError(404, -32001, "Session not found");        return transport.handleRequest(request);      }       let created: McpServer | undefined;      let createdSessionId: string | null = null;      const transport = new WebStandardStreamableHTTPServerTransport({        sessionIdGenerator: () => crypto.randomUUID(),        enableJsonResponse: true,        onsessioninitialized: (sid) => {          createdSessionId = sid;          transports.set(sid, transport);          if (created) servers.set(sid, created);        },        onsessionclosed: (sid) => void dispose(sid, { server: true }),      });       transport.onclose = () => {        const sid = transport.sessionId;        if (sid) void dispose(sid, { server: true });      };       // oxlint-disable-next-line executor/no-try-catch-or-throw -- boundary: MCP SDK handler must return JSON-RPC errors from thrown Promise APIs      try {        const elicitationMode = readElicitationMode(request);        created = await Effect.runPromise(          createExecutorMcpServer({            ...config,            browserApprovalStore: {              takeResponse: (executionId) =>                Effect.sync(() => {                  if (!createdSessionId) return null;                  const sessionApprovals = approvalResponses.get(createdSessionId);                  const response = sessionApprovals?.get(executionId) ?? null;                  sessionApprovals?.delete(executionId);                  return response;                }),              waitForResponse: (executionId) =>                Effect.gen(function* () {                  if (!createdSessionId) return null;                  const sessionApprovals = approvalResponses.get(createdSessionId);                  const response = sessionApprovals?.get(executionId) ?? null;                  if (response) {                    sessionApprovals?.delete(executionId);                    return response;                  }                   const sessionWaiters =                    approvalWaiters.get(createdSessionId) ??                    new Map<string, Deferred.Deferred<ResumeResponse>>();                  const waiter =                    sessionWaiters.get(executionId) ?? (yield* Deferred.make<ResumeResponse>());                  sessionWaiters.set(executionId, waiter);                  approvalWaiters.set(createdSessionId, sessionWaiters);                   yield* Deferred.await(waiter).pipe(                    Effect.ensuring(                      Effect.sync(() => {                        if (sessionWaiters.get(executionId) === waiter) {                          sessionWaiters.delete(executionId);                        }                      }),                    ),                  );                  const approvals = approvalResponses.get(createdSessionId);                  const approved = approvals?.get(executionId) ?? null;                  approvals?.delete(executionId);                  return approved;                }),            },            elicitationMode:              elicitationMode === "browser"                ? {                    mode: "browser" as const,                    approvalUrl: (executionId) =>                      approvalUrlForRequest(request, executionId, createdSessionId),                  }                : { mode: elicitationMode },          }),        );        await created.connect(transport);        const response = await transport.handleRequest(request);         if (!transport.sessionId) {          await ignoreClose(() => transport.close());          const server = created;          await ignoreClose(server ? () => server.close() : undefined);        }        return response;      } catch (error) {        console.error("[mcp] handleRequest error:", formatBoundaryError(error));        if (!transport.sessionId) {          await ignoreClose(() => transport.close());          const server = created;          await ignoreClose(server ? () => server.close() : undefined);        }        return jsonError(500, -32603, "Internal server error");      }    },     handleApprovalRequest: async (request) => {      const url = new URL(request.url);      const match = approvalRequestPattern.exec(url.pathname);      if (!match) return json({ error: "Not found" }, 404);      if (request.method !== "POST") return json({ error: "Method not allowed" }, 405);       const sessionId = decodeURIComponent(match[1]);      const executionId = decodeURIComponent(match[2]);      if (!servers.has(sessionId)) return json({ error: "MCP session not found" }, 404);       const response = await readResumeResponse(request);      if (!response) return json({ error: "Invalid approval response" }, 400);       const sessionApprovals =        approvalResponses.get(sessionId) ?? new Map<string, ResumeResponse>();      sessionApprovals.set(executionId, response);      approvalResponses.set(sessionId, sessionApprovals);      const waiter = approvalWaiters.get(sessionId)?.get(executionId);      if (waiter) await Effect.runPromise(Deferred.succeed(waiter, response));       return json(resumeApprovalResult(executionId, response));    },     close: async () => {      const ids = new Set([...transports.keys(), ...servers.keys()]);      await Promise.all([...ids].map((id) => dispose(id, { transport: true, server: true })));    },  };}; // ---------------------------------------------------------------------------// Stdio transport// --------------------------------------------------------------------------- export const runMcpStdioServer = async (config: ExecutorMcpServerConfig): Promise<void> => {  startIntegrationsRefresh();   const server = await Effect.runPromise(createExecutorMcpServer(config));  const transport = new StdioServerTransport();   const waitForExit = () =>    new Promise<void>((resolve) => {      const finish = () => {        process.off("SIGINT", finish);        process.off("SIGTERM", finish);        process.stdin.off("end", finish);        process.stdin.off("close", finish);        resolve();      };      process.once("SIGINT", finish);      process.once("SIGTERM", finish);      process.stdin.once("end", finish);      process.stdin.once("close", finish);    });   // oxlint-disable-next-line executor/no-try-catch-or-throw -- boundary: stdio server lifetime uses Promise-based SDK/process APIs and always closes resources  try {    await server.connect(transport);    await waitForExit();  } finally {    await ignoreClose(() => transport.close());    await ignoreClose(() => server.close());  }};