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* MCP Tool: get_mep_declarations
*
* Retrieve MEP declarations of financial interests.
* Supports single declaration lookup by docId or list with year filtering.
*
* **Intelligence Perspective:** Financial declarations enable conflict-of-interest
* detection, lobbying pattern analysis, and transparency assessment for MEP profiling.
*
* **Business Perspective:** Declaration data supports compliance monitoring products
* and corporate governance risk assessment services.
*
* **EP API Endpoints:**
* - `GET /meps-declarations` (list)
* - `GET /meps-declarations/{doc-id}` (single)
*
* ISMS Policy: SC-002 (Input Validation), DP-001 (Data Protection)
* @gdpr Access is audit-logged per GDPR Art. 6(1)(e)
*/
import { GetMEPDeclarationsSchema } 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_mep_declarations MCP tool request.
*
* Retrieves MEP declarations of financial interests filed under the Rules of Procedure.
* Supports both single-declaration lookup by document ID and list retrieval with optional
* year filtering. Financial declaration data enables conflict-of-interest detection,
* lobbying pattern analysis, and transparency assessments.
*
* @param args - Raw tool arguments, validated against {@link GetMEPDeclarationsSchema}
* @returns MCP tool result containing either a single MEP financial declaration document
* or a paginated list of declarations, optionally filtered by filing year
* @throws - If `args` fails schema validation (e.g., invalid year or limit
* out of range 1–100)
* - If the European Parliament API is unreachable or returns an error response
*
* @example
* ```typescript
* // List declarations for a specific year
* const result = await handleGetMEPDeclarations({ year: 2024, limit: 20 });
* // Returns up to 20 financial declarations filed in 2024
*
* // Fetch a single declaration by document ID
* const single = await handleGetMEPDeclarations({ docId: 'DECL-2024-001' });
* // Returns the full declaration document
* ```
*
* @security - Input is validated with Zod before any API call.
* - Access to financial declarations (personal data) is audit-logged per GDPR Art. 6(1)(e)
* and ISMS Policy AU-002. Data minimisation applied per GDPR Article 5(1)(c).
* @since 0.8.0
* @see {@link getMEPDeclarationsToolMetadata} for MCP schema registration
* @see {@link handleGetMEPDetails} for retrieving broader MEP profile information
*/
export async function handleGetMEPDeclarations(
args: unknown
): Promise<ToolResult> {
const params = GetMEPDeclarationsSchema.parse(args);
if (params.docId !== undefined) {
const result = await epClient.getMEPDeclarationById(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.getMEPDeclarations(apiParams as Parameters<typeof epClient.getMEPDeclarations>[0]);
return buildToolResponse(result);
}
/** Tool metadata for get_mep_declarations */
export const getMEPDeclarationsToolMetadata = {
name: 'get_mep_declarations',
description: 'Get MEP declarations of financial interests filed under the Rules of Procedure. Supports single declaration lookup by docId or list with year filter. Data source: European Parliament Open Data Portal. GDPR: Access is audit-logged.',
inputSchema: {
type: 'object' as const,
properties: {
docId: { type: 'string', description: 'Document ID for single declaration lookup' },
year: { type: 'number', description: 'Filter by filing year (e.g., 2024)' },
limit: { type: 'number', description: 'Maximum results to return (1-100)', default: 50 },
offset: { type: 'number', description: 'Pagination offset', default: 0 }
}
}
};
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