# All files / src/tools getHomonymMEPs.ts

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     /**
     * MCP Tool: get_homonym_meps
     *
     * Retrieve homonym Members of European Parliament for the current parliamentary term.
     *
     * **Intelligence Perspective:** Identifies MEPs with identical names, important for
     * disambiguation in intelligence analysis and data matching.
     *
     * **Business Perspective:** Ensures accurate MEP identification in products
     * that match MEP names across data sources.
     *
     * **EP API Endpoint:** `GET /meps/show-homonyms`
     *
     * ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
     */

    import { GetHomonymMEPsSchema } from '../schemas/europeanParliament.js';
    import { epClient } from '../clients/europeanParliamentClient.js';
    import { buildToolResponse } from './shared/responseBuilder.js';
    import { ToolError } from './shared/errors.js';
    import { z } from 'zod';
    import type { ToolResult } from './shared/types.js';

    /**
     * Handles the get_homonym_meps MCP tool request.
     *
     * Retrieves Members of European Parliament who share identical names with other MEPs in the
     * current parliamentary term. Essential for disambiguation in data matching, identity
     * resolution pipelines, and intelligence analysis workflows where name collisions could
     * produce incorrect entity linkage.
     *
     * @param args - Raw tool arguments, validated against {@link GetHomonymMEPsSchema}
     * @returns MCP tool result containing a paginated list of MEP records with homonymous names
     * @throws - If `args` fails schema validation (e.g., limit out of range 1–100)
     * - If the European Parliament API is unreachable or returns an error response
     *
     * @example
     * ```typescript
     * const result = await handleGetHomonymMEPs({ limit: 50, offset: 0 });
     * // Returns MEPs who share a name with at least one other MEP in the current term
     * ```
     *
     * @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 getHomonymMEPsToolMetadata} for MCP schema registration
     * @see {@link handleGetMEPDetails} for disambiguating a specific MEP by unique ID
     */
    export async function handleGetHomonymMEPs(args: unknown): Promise<ToolResult> {
      let params: ReturnType<typeof GetHomonymMEPsSchema.parse>;
      try {
        params = GetHomonymMEPsSchema.parse(args);
      } catch (error: unknown) {
        Eif (error instanceof z.ZodError) {
          const fieldErrors = error.issues.map((e) => `${e.path.join('.')}: ${e.message}`).join('; ');
          throw new ToolError({
            toolName: 'get_homonym_meps',
            operation: 'validateInput',
            message: `Invalid parameters: ${fieldErrors}`,
            isRetryable: false,
            cause: error,
          });
        }
        throw error;
      }

      try {
        const result = await epClient.getHomonymMEPs({
          limit: params.limit,
          offset: params.offset,
        });

        return buildToolResponse(result);
      } catch (error: unknown) {
        throw new ToolError({
          toolName: 'get_homonym_meps',
          operation: 'fetchData',
          message: 'Failed to retrieve homonym MEPs',
          isRetryable: true,
          cause: error,
        });
      }
    }
    /** Tool metadata for get_homonym_meps */
    export const getHomonymMEPsToolMetadata = {
      name: 'get_homonym_meps',
      description:
        'Get homonym Members of European Parliament (MEPs with identical names) for the current parliamentary term. Useful for name disambiguation. Data source: European Parliament Open Data Portal.',
      inputSchema: {
        type: 'object' as const,
        properties: {
          limit: { type: 'number', description: 'Maximum results to return (1-100)', default: 50 },
          offset: { type: 'number', description: 'Pagination offset', default: 0 },
        },
      },
    };