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* MCP Tool: get_external_documents
*
* Retrieve external documents (non-EP documents) from the European Parliament data portal,
* with optional single document lookup.
*
* **Intelligence Perspective:** External documents include inter-institutional communications,
* Council positions, and Commission proposals relevant to EP legislative work.
*
* **Business Perspective:** Provides access to external reference documents needed
* for complete regulatory intelligence.
*
* **EP API Endpoints:**
* - `GET /external-documents` (list)
* - `GET /external-documents/{doc-id}` (single)
*
* ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
*/
import { GetExternalDocumentsSchema } from '../schemas/europeanParliament.js';
import { epClient } from '../clients/europeanParliamentClient.js';
import { buildToolResponse } from './shared/responseBuilder.js';
import type { ToolResult } from './shared/types.js';
/**
* Handles the get_external_documents MCP tool request.
*
* Retrieves external documents (non-EP documents such as Council positions and Commission
* proposals) from the European Parliament data portal. Supports both a paginated list view
* and a single-document lookup when `docId` is provided.
*
* @param args - Raw tool arguments, validated against {@link GetExternalDocumentsSchema}
* @returns MCP tool result containing external document data (single document or paginated list)
* @throws - If `args` fails schema validation (e.g., invalid field types or formats)
* - If the European Parliament API is unreachable or returns an error response
*
* @example
* ```typescript
* // Single document lookup
* const single = await handleGetExternalDocuments({ docId: 'COM-2024-123' });
* // Returns the external document with ID COM-2024-123
*
* // List documents filtered by year
* const list = await handleGetExternalDocuments({ year: 2024, limit: 30, offset: 0 });
* // Returns up to 30 external documents from 2024
* ```
*
* @security - Input is validated with Zod before any API call.
* - Personal data in responses is minimised per GDPR Article 5(1)(c).
* - All requests are rate-limited and audit-logged per ISMS Policy AU-002.
* @since 0.8.0
* @see {@link getExternalDocumentsToolMetadata} for MCP schema registration
* @see {@link handleSearchDocuments} for full-text search across EP legislative documents
*/
export async function handleGetExternalDocuments(
args: unknown
): Promise<ToolResult> {
const params = GetExternalDocumentsSchema.parse(args);
if (params.docId !== undefined) {
const result = await epClient.getExternalDocumentById(params.docId);
return buildToolResponse(result);
}
const apiParams: Record<string, unknown> = {
limit: params.limit,
offset: params.offset
};
if (params.year !== undefined) apiParams['year'] = params.year;
const result = await epClient.getExternalDocuments(apiParams as Parameters<typeof epClient.getExternalDocuments>[0]);
return buildToolResponse(result);
}
/** Tool metadata for get_external_documents */
export const getExternalDocumentsToolMetadata = {
name: 'get_external_documents',
description: 'Get external documents (non-EP documents such as Council positions, Commission proposals) from the European Parliament data portal. Supports single document lookup by docId. Data source: European Parliament Open Data Portal.',
inputSchema: {
type: 'object' as const,
properties: {
docId: { type: 'string', description: 'Document ID for single document lookup' },
year: { type: 'number', description: 'Filter by year' },
limit: { type: 'number', description: 'Maximum results to return (1-100)', default: 50 },
offset: { type: 'number', description: 'Pagination offset', default: 0 }
}
}
};
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