Health Check

Instructions

Implementation Reference

• src/tools/instances.ts:62-76 (registration)

  Registration of 'pinchtab_health' tool with server.registerTool(), including description and inputSchema.

  server.registerTool(
    "pinchtab_health",
    {
      description: "Check if PinchTab server is running and responsive.",
      inputSchema: z.object({}),
      title: "Health Check",
    },
    async () => {
      try {
        return toolResult(await pinch("GET", "/health"));
      } catch (error) {
        return toolError(error);
      }
    },
  );

• src/tools/instances.ts:69-75 (handler)

  Handler function that executes the health check by calling pinch('GET', '/health') and returning the result or error.

  async () => {
    try {
      return toolResult(await pinch("GET", "/health"));
    } catch (error) {
      return toolError(error);
    }
  },

• src/tools/instances.ts:64-67 (schema)

  Input schema for pinchtab_health: empty object (no parameters needed). Title is 'Health Check'.

  {
    description: "Check if PinchTab server is running and responsive.",
    inputSchema: z.object({}),
    title: "Health Check",

• src/pinchtab/client.ts:6-49 (helper)

  The pinch() helper function used by the handler to make HTTP requests to the PinchTab server (GET /health).

  export async function pinch(
    method: string,
    path: string,
    body?: Record<string, unknown>,
  ): Promise<unknown> {
    if (!(await isPinchtabRunning())) {
      await ensurePinchtabRunning();
    }
  
    const headers: Record<string, string> = {
      "Content-Type": "application/json",
    };
    if (PINCHTAB_TOKEN) {
      headers["Authorization"] = `Bearer ${PINCHTAB_TOKEN}`;
    }
  
    const url = `${PINCHTAB_URL}${path}`;
  
    let res: Response;
    try {
      res = await fetch(url, {
        body: body ? JSON.stringify(body) : undefined,
        headers,
        method,
        signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
      });
    } catch (error) {
      if (error instanceof DOMException && error.name === "TimeoutError") {
        throw new Error(`PinchTab ${method} ${path} timed out after ${REQUEST_TIMEOUT_MS / 1000}s`);
      }
      throw error;
    }
  
    if (!res.ok) {
      const text = await res.text();
      throw new Error(`PinchTab ${method} ${path} → ${res.status}: ${text}`);
    }
  
    const contentType = (res.headers.get("content-type") ?? "").split(";")[0].toLowerCase().trim();
    if (contentType === "application/json") {
      return res.json();
    }
    return res.text();
  }

• src/utils.ts:18-28 (helper)

  Utility functions toolResult() and toolError() used by the handler to format success/error responses.

  export function toolResult(data: unknown): ToolResult {
    return { content: [{ text: toJson(data), type: "text" as const }] };
  }
  
  /** Format an error as an MCP tool error response. */
  export function toolError(error: unknown): ToolResult {
    const message = error instanceof Error ? error.message : String(error);
    return {
      content: [{ text: message, type: "text" as const }],
      isError: true,
    };