business_listings

Instructions

Implementation Reference

• src/tools/business.ts:69-86 (handler)

  The 'business_listings' tool handler. Calls /v1/business/listings API with category, location, and optional limit. Returns up to 200 results (default 50). Costs 10 credits per 50 results.

  server.tool(
    "business_listings",
    "Search for businesses by category and location. Returns a list of businesses with name, rating, reviews, address, phone, place_id, and categories. Costs 10 credits per 50 results.",
    {
      category: z.string().describe('Business category (e.g. "plumber", "dentist")'),
      location: z.string().describe("City and state"),
      limit: z.number().int().min(1).max(200).optional().describe("Number of results (1-200). Default: 50"),
    },
    READ_ONLY,
    withErrorHandling(async ({ category, location, limit }) => {
      const result = await callApi(
        "/v1/business/listings",
        { category, location, ...(limit && { limit }) },
        getAuth()
      );
      return { content: [{ type: "text" as const, text: formatResult(result.data, result) }] };
    })
  );

• src/tools/business.ts:72-76 (schema)

  Input schema for 'business_listings': category (string), location (string), and optional limit (int 1-200, default 50).

  {
    category: z.string().describe('Business category (e.g. "plumber", "dentist")'),
    location: z.string().describe("City and state"),
    limit: z.number().int().min(1).max(200).optional().describe("Number of results (1-200). Default: 50"),
  },

• src/tools/business.ts:69-86 (registration)

  Tool registered via server.tool() with the name 'business_listings' and read-only hints.

  server.tool(
    "business_listings",
    "Search for businesses by category and location. Returns a list of businesses with name, rating, reviews, address, phone, place_id, and categories. Costs 10 credits per 50 results.",
    {
      category: z.string().describe('Business category (e.g. "plumber", "dentist")'),
      location: z.string().describe("City and state"),
      limit: z.number().int().min(1).max(200).optional().describe("Number of results (1-200). Default: 50"),
    },
    READ_ONLY,
    withErrorHandling(async ({ category, location, limit }) => {
      const result = await callApi(
        "/v1/business/listings",
        { category, location, ...(limit && { limit }) },
        getAuth()
      );
      return { content: [{ type: "text" as const, text: formatResult(result.data, result) }] };
    })
  );

• src/server.ts:36-36 (registration)

  Registration call: registerBusinessTools(server, getAuth) wires the tools into the MCP server.

  registerBusinessTools(server, getAuth);

• src/api-client.ts:25-158 (helper)

  The callApi helper and withErrorHandling wrapper used by the business_listings handler to call the external API and format results.

  export async function callApi(
    path: string,
    body: Record<string, unknown>,
    authHeader: string,
    timeoutMs = 60_000
  ): Promise<{ data: unknown; credits_used: number; credits_remaining: number; cached: boolean }> {
    const url = `${env.API_BASE_URL}${path}`;
  
    console.log(`[api] POST ${url} (timeout: ${timeoutMs / 1000}s, auth: ${authHeader ? `${authHeader.slice(0, 15)}...` : "MISSING"})`);
  
    const response = await fetch(url, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Authorization: authHeader,
      },
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(timeoutMs),
    });
  
    if (!response.ok) {
      const text = await response.text();
      console.error(`[api] ${response.status} ${response.statusText} from ${path}: ${text.slice(0, 200)}`);
      // Try to parse as structured error
      try {
        const result = JSON.parse(text) as ApiErrorResponse;
        if (result.status === "error") {
          const err = result.error;
          const reqId = result.request_id ? ` [request_id: ${result.request_id}]` : "";
          throw new Error(
            err.required_credits
              ? `${err.message} (requires ${err.required_credits} credits, balance: ${err.current_balance})${reqId}`
              : `${err.message}${reqId}`
          );
        }
      } catch (parseErr) {
        if (parseErr instanceof Error && parseErr.message !== "error") {
          // Re-throw if it's our structured error from above
          if (!text.includes('"status":"error"')) {
            throw new Error(`API returned ${response.status}: ${text.slice(0, 200)}`);
          }
          throw parseErr;
        }
      }
      throw new Error(`API returned ${response.status}: ${text.slice(0, 200)}`);
    }
  
    const result = (await response.json()) as ApiResponse;
  
    if (result.status === "error") {
      const err = (result as ApiErrorResponse).error;
      const reqId = (result as ApiErrorResponse).request_id ? ` [request_id: ${(result as ApiErrorResponse).request_id}]` : "";
      throw new Error(
        err.required_credits
          ? `${err.message} (requires ${err.required_credits} credits, balance: ${err.current_balance})${reqId}`
          : `${err.message}${reqId}`
      );
    }
  
    console.log(`[api] ${path} OK (${result.credits_used} credits used, ${result.credits_remaining} remaining)`);
  
    return {
      data: result.data,
      credits_used: result.credits_used,
      credits_remaining: result.credits_remaining,
      cached: result.cached,
    };
  }
  
  export async function callApiGet(
    path: string,
    authHeader: string
  ): Promise<{ data: unknown; credits_used: number; credits_remaining: number; cached: boolean }> {
    const url = `${env.API_BASE_URL}${path}`;
  
    console.log(`[api] GET ${url} (auth: ${authHeader ? `${authHeader.slice(0, 15)}...` : "MISSING"})`);
  
    const response = await fetch(url, {
      method: "GET",
      headers: {
        Authorization: authHeader,
      },
      signal: AbortSignal.timeout(60_000),
    });
  
    if (!response.ok) {
      const text = await response.text();
      console.error(`[api] ${response.status} ${response.statusText} from ${path}: ${text.slice(0, 200)}`);
      throw new Error(`API returned ${response.status}: ${text.slice(0, 200)}`);
    }
  
    const result = (await response.json()) as ApiResponse;
  
    if (result.status === "error") {
      throw new Error(result.error.message);
    }
  
    console.log(`[api] ${path} OK (${result.credits_used} credits used, ${result.credits_remaining} remaining)`);
  
    return {
      data: result.data,
      credits_used: result.credits_used,
      credits_remaining: result.credits_remaining,
      cached: result.cached,
    };
  }
  
  export function formatResult(
    data: unknown,
    meta: { credits_used: number; credits_remaining: number; cached: boolean }
  ): string {
    const metaLine = `[${meta.credits_used} credit${meta.credits_used !== 1 ? "s" : ""} used | ${meta.credits_remaining} remaining${meta.cached ? " | cached" : ""}]`;
    return `${metaLine}\n\n${JSON.stringify(data, null, 2)}`;
  }
  
  type ToolResult = { content: { type: "text"; text: string }[]; isError?: boolean };
  
  /** Wrap an MCP tool handler so thrown errors always surface as MCP error content */
  export function withErrorHandling<T>(
    fn: (args: T) => Promise<ToolResult>
  ): (args: T) => Promise<ToolResult> {
    return async (args) => {
      try {
        return await fn(args);
      } catch (err) {
        const message = err instanceof Error ? err.message : String(err);
        console.error(`[mcp] Tool error: ${message}`);
        return {
          content: [{ type: "text" as const, text: `Error: ${message}` }],
          isError: true,
        };
      }
    };
  }