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* MCP Tool: get_meps
*
* Retrieve Members of European Parliament with filtering options
*
* **Intelligence Perspective:** Foundation for MEP profiling, political group cohesion analysis,
* national delegation mapping, and cross-party alliance detection via OSINT methodologies.
*
* **Business Perspective:** Core data product for B2G/B2B customers requiring MEP contact
* databases, political risk assessments, and stakeholder mapping services.
*
* **Marketing Perspective:** Primary showcase tool demonstrating API value proposition
* to journalists, researchers, and civic tech developers seeking structured MEP data.
*
* ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
*/
import { GetMEPsSchema, MEPSchema, PaginatedResponseSchema } from '../schemas/europeanParliament.js';
import { epClient } from '../clients/europeanParliamentClient.js';
import { buildToolResponse } from './shared/responseBuilder.js';
import { buildApiParams } from './shared/paramBuilder.js';
import { ToolError } from './shared/errors.js';
import { z } from 'zod';
import type { ToolResult } from './shared/types.js';
/**
* Handles the get_meps MCP tool request.
*
* Retrieves Members of European Parliament with optional filtering by country, political
* group, committee, and active status. Results are paginated and GDPR-compliant.
*
* **Intelligence Use Cases:** Filter by country for national delegation analysis, by group for
* cohesion studies, by committee for policy domain expertise mapping.
*
* **Business Use Cases:** Power stakeholder mapping products, political risk dashboards,
* and MEP engagement tracking for corporate affairs teams.
*
* **Marketing Use Cases:** Demo-ready endpoint for showcasing EP data access to potential
* API consumers, journalists, and civic tech developers.
*
* @param args - Raw tool arguments, validated against {@link GetMEPsSchema}
* @returns MCP tool result containing a paginated list of MEP records with name, country,
* political group, committee memberships, and contact information
* @throws {ToolError} With `operation: 'validateInput'` if `args` fails Zod schema validation
* (e.g., country code not 2 uppercase letters, limit out of range 1–100)
* @throws {ToolError} With `operation: 'validateOutput'` if the EP API response does not match
* the expected schema shape
* @throws {ToolError} With `operation: 'fetchData'` if the European Parliament API is
* unreachable or returns an error response
*
* @example
* ```typescript
* const result = await handleGetMEPs({ country: 'SE', limit: 10 });
* // Returns up to 10 Swedish MEPs with group and committee details
* ```
*
* @example
* ```typescript
* // Get active EPP group members
* const result = await handleGetMEPs({ group: "EPP", active: true, limit: 50 });
* ```
*
* @security - Input is validated with Zod before any API call.
* - Errors are sanitized to avoid exposing internal implementation details.
* - Personal data in responses is minimised per GDPR Article 5(1)(c).
* - Personal data access is audit-logged per GDPR Article 30.
* - All requests are rate-limited and audit-logged per ISMS Policy AU-002.
* - ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
* @since 0.8.0
* @see {@link getMEPsToolMetadata} for MCP schema registration
* @see {@link handleGetMEPDetails} for retrieving full details of a single MEP
*/
export async function handleGetMEPs(
args: unknown
): Promise<ToolResult> {
// Validate input — ZodErrors here are client mistakes (non-retryable)
let params: ReturnType<typeof GetMEPsSchema.parse>;
try {
params = GetMEPsSchema.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_meps',
operation: 'validateInput',
message: `Invalid parameters: ${fieldErrors}`,
isRetryable: false,
cause: error,
});
}
throw error;
}
try {
// Fetch MEPs from EP API (only pass defined properties)
const apiParams = {
active: params.active,
limit: params.limit,
offset: params.offset,
...buildApiParams(params, [
{ from: 'country', to: 'country' },
{ from: 'group', to: 'group' },
{ from: 'committee', to: 'committee' },
]),
};
const result = await epClient.getMEPs(apiParams as Parameters<typeof epClient.getMEPs>[0]);
// Validate output
const outputSchema = PaginatedResponseSchema(MEPSchema);
const validated = outputSchema.parse(result);
return buildToolResponse(validated);
} catch (error: unknown) {
Iif (error instanceof z.ZodError) {
const fieldErrors = error.issues.map(e => `${e.path.join('.')}: ${e.message}`).join('; ');
throw new ToolError({
toolName: 'get_meps',
operation: 'validateOutput',
message: `Unexpected EP API response format: ${fieldErrors}`,
isRetryable: false,
cause: error,
});
}
throw new ToolError({
toolName: 'get_meps',
operation: 'fetchData',
message: 'Failed to retrieve MEPs',
isRetryable: true,
cause: error,
});
}
}
/**
* Tool metadata for MCP registration
*/
export const getMEPsToolMetadata = {
name: 'get_meps',
description: 'Retrieve Members of European Parliament with optional filters (country, political group, committee, active status). Returns paginated results with MEP details including name, country, political group, committees, and contact information.',
inputSchema: {
type: 'object' as const,
properties: {
country: {
type: 'string',
description: 'ISO 3166-1 alpha-2 country code (e.g., "SE" for Sweden)',
pattern: '^[A-Z]{2}$',
minLength: 2,
maxLength: 2
},
group: {
type: 'string',
description: 'Political group identifier (e.g., "EPP", "S&D", "Greens/EFA")',
minLength: 1,
maxLength: 50
},
committee: {
type: 'string',
description: 'Committee identifier (e.g., "ENVI", "AGRI")',
minLength: 1,
maxLength: 100
},
active: {
type: 'boolean',
description: 'Filter by active status',
default: true
},
limit: {
type: 'number',
description: 'Maximum number of results to return (1-100)',
minimum: 1,
maximum: 100,
default: 50
},
offset: {
type: 'number',
description: 'Pagination offset',
minimum: 0,
default: 0
}
}
}
};
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