Sanctions Changes

Instructions

Implementation Reference

• src/tools/sanctions.ts:162-189 (handler)

  The async handler function for the 'sanctions_changes' tool. It calls the API endpoint /api/v1/sanctions/changes with 'since' and 'limit' parameters, processes the response, and returns results with a summary showing the count of changes found.

    async ({ since, limit }) => {
      const res = await apiGet<SanctionsQueryResponse>(
        "/api/v1/sanctions/changes",
        { since, limit: limit ?? 50 },
      );
  
      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} sanctions change(s) since ${since}.`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/tools/sanctions.ts:141-161 (schema)

  The registration call for 'sanctions_changes' including its metadata (title, description, cost) and input schema defining 'since' (ISO 8601 timestamp, required) and 'limit' (max results, optional, default 50) parameters.

  server.registerTool(
    "sanctions_changes",
    {
      title: "Sanctions Changes",
      description:
        "Get recent changes to sanctions lists since a given timestamp. Shows additions, " +
        "removals, and modifications to sanctioned entities. " +
        "Cost: $0.005 per query. Source: Consolidated sanctions lists.",
      inputSchema: {
        since: z
          .string()
          .describe("ISO 8601 timestamp to get changes since (e.g. 2026-03-01T00:00:00Z)"),
        limit: z
          .number()
          .int()
          .min(1)
          .max(100)
          .optional()
          .describe("Maximum results (default 50)"),
      },
    },

• src/index.ts:48-48 (registration)

  Registration of the sanctions tools module (registerSanctionsTools) into the MCP server, which includes the 'sanctions_changes' tool.

  registerSanctionsTools(server);

• src/client.ts:44-76 (helper)

  The apiGet helper used by the sanctions_changes 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,
    };
  }