Top Government Contract Vendors

Instructions

Implementation Reference

• src/tools/contracts.ts:171-199 (handler)

  The async handler function for 'top_vendors' tool. Calls apiGet to /api/v1/contracts/vendors with agency, period, and limit params, then formats the response as text.

    async ({ agency, period, limit }) => {
      const res = await apiGet<ContractQueryResponse>("/api/v1/contracts/vendors", {
        agency,
        period: period ?? "1y",
        limit: limit ?? 25,
      });
  
      if (!res.ok) {
        return {
          content: [
            {
              type: "text" as const,
              text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
            },
          ],
          isError: true,
        };
      }
  
      const { count, data } = res.data;
      const warn = stalenessWarning(res);
      const summary = `${warn}Found ${count} vendor(s).`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/tools/contracts.ts:153-169 (schema)

  Input schema for 'top_vendors': optional agency (string), period (enum: 1y/3y/5y/all), and limit (number, 1-100).

  inputSchema: {
    agency: z
      .string()
      .optional()
      .describe("Filter by awarding agency"),
    period: z
      .enum(["1y", "3y", "5y", "all"])
      .optional()
      .describe("Time period for ranking (default: 1y)"),
    limit: z
      .number()
      .int()
      .min(1)
      .max(100)
      .optional()
      .describe("Maximum results (default 25)"),
  },

• src/tools/contracts.ts:145-199 (registration)

  Registration of 'top_vendors' tool via server.registerTool(), including title, description, inputSchema, and handler.

  server.registerTool(
    "top_vendors",
    {
      title: "Top Government Contract Vendors",
      description:
        "Get vendor rankings by total award value. Shows top contractors by agency, " +
        "total awards, and contract counts. " +
        "Cost: $0.03 per query. Source: USAspending.gov.",
      inputSchema: {
        agency: z
          .string()
          .optional()
          .describe("Filter by awarding agency"),
        period: z
          .enum(["1y", "3y", "5y", "all"])
          .optional()
          .describe("Time period for ranking (default: 1y)"),
        limit: z
          .number()
          .int()
          .min(1)
          .max(100)
          .optional()
          .describe("Maximum results (default 25)"),
      },
    },
    async ({ agency, period, limit }) => {
      const res = await apiGet<ContractQueryResponse>("/api/v1/contracts/vendors", {
        agency,
        period: period ?? "1y",
        limit: limit ?? 25,
      });
  
      if (!res.ok) {
        return {
          content: [
            {
              type: "text" as const,
              text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
            },
          ],
          isError: true,
        };
      }
  
      const { count, data } = res.data;
      const warn = stalenessWarning(res);
      const summary = `${warn}Found ${count} vendor(s).`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/index.ts:53-53 (registration)

  The registerContractTools(server) call that wires up the contract tools including 'top_vendors' into the MCP server.

  registerContractTools(server);

• src/client.ts:44-76 (helper)

  The apiGet helper used by the handler to make HTTP GET requests to the Verilex API.

  export async function apiGet<T = unknown>(
    path: string,
    params?: Record<string, string | number | undefined>,
  ): Promise<ApiResponse<T>> {
    const url = buildUrl(path, params);
  
    const headers: Record<string, string> = {
      Accept: "application/json",
      "User-Agent": "verilex-mcp-server/0.1.0",
    };
  
    // Forward x402 payment token if present in env (for paid endpoints)
    const paymentToken = process.env.VERILEX_PAYMENT_TOKEN;
    if (paymentToken) {
      headers["X-Payment-Token"] = paymentToken;
    }
  
    const res = await fetch(url, { headers });
    const data = (await res.json()) as T;
  
    const stale = res.headers.get("X-Data-Stale");
    const lastUpdated = res.headers.get("X-Data-Last-Updated");
    const ageSeconds = res.headers.get("X-Data-Age-Seconds");
  
    return {
      ok: res.ok,
      status: res.status,
      data,
      stale: stale === "true",
      lastUpdated: lastUpdated ?? undefined,
      ageSeconds: ageSeconds ? Number(ageSeconds) : undefined,
    };
  }