Verify an international address

Instructions

Implementation Reference

• src/tools/verifications.ts:107-114 (handler)

  Handler function for lob_intl_verifications_create — makes a POST request to Lob's /intl_verifications endpoint with the validated arguments merged with extra params.

  handler: async (args) => {
    const { extra, ...rest } = args;
    return lob.request({
      method: "POST",
      path: "/intl_verifications",
      body: withExtra(rest, extra),
    });
  },

• src/tools/verifications.ts:101-106 (schema)

  Input schema for lob_intl_verifications_create — spreads intlAddressInputSchema (primary_line, secondary_line, city, state, postal_code, country) plus optional address, recipient, and extra params.

  inputSchema: {
    ...intlAddressInputSchema,
    address: z.string().optional().describe("Full single-line address (alternative to fields above)."),
    recipient: z.string().optional(),
    extra: extraParamsSchema,
  },

• src/tools/verifications.ts:95-115 (registration)

  Registration of lob_intl_verifications_create tool via registerTool() helper, within the registerVerificationTools() function called from register.ts

  registerTool(server, {
    name: "lob_intl_verifications_create",
    annotations: { title: "Verify an international address", ...ToolAnnotationPresets.read },
    description:
      "Verify a single non-US address. Returns deliverability status and standardized components for " +
      "the destination country.",
    inputSchema: {
      ...intlAddressInputSchema,
      address: z.string().optional().describe("Full single-line address (alternative to fields above)."),
      recipient: z.string().optional(),
      extra: extraParamsSchema,
    },
    handler: async (args) => {
      const { extra, ...rest } = args;
      return lob.request({
        method: "POST",
        path: "/intl_verifications",
        body: withExtra(rest, extra),
      });
    },
  });

• src/schemas/common.ts:161-166 (helper)

  withExtra helper — merges extra params with the typed payload, with explicit fields taking precedence over extra.

  export function withExtra(
    payload: object,
    extra: Record<string, unknown> | undefined,
  ): Record<string, unknown> {
    return { ...(extra ?? {}), ...compact(payload) };
  }

• src/tools/helpers.ts:85-117 (helper)

  registerTool helper — wraps the tool definition with error handling and registers it with the MCP server.

  export function registerTool<TShape extends ZodRawShape>(
    server: McpServer,
    def: ToolDefinition<TShape>,
  ): void {
    const a = def.annotations ?? {};
    server.registerTool(
      def.name,
      {
        title: a.title ?? def.name,
        description: def.description,
        inputSchema: def.inputSchema,
        annotations: {
          ...a,
          // Lob is always external; default the hint accordingly.
          openWorldHint: a.openWorldHint ?? true,
        },
      },
      // The SDK's ToolCallback type is parameterised over the exact ZodRawShape and
      // resists the generic erasure here. The runtime contract (validated args in,
      // CallToolResult out) is correct, so we bridge the type boundary with `as never`.
      (async (args: unknown, serverCtx: unknown): Promise<CallToolResult> => {
        try {
          const result = await def.handler(args as never, serverCtx);
          return { content: [{ type: "text", text: stringifyResult(result) }] };
        } catch (err) {
          return {
            isError: true,
            content: [{ type: "text", text: formatErrorForTool(err) }],
          };
        }
      }) as never,
    );
  }

• src/tools/verifications.ts:27-34 (schema)

  The intlAddressInputSchema used as the base for the input schema of lob_intl_verifications_create.

  const intlAddressInputSchema = {
    primary_line: z.string().describe("Primary street address line."),
    secondary_line: z.string().optional(),
    city: z.string().optional(),
    state: z.string().optional().describe("State, province, or region."),
    postal_code: z.string().optional(),
    country: z.string().length(2).describe("Two-letter ISO country code."),
  };