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* MCP Tool: get_latest_votes
*
* Retrieve the latest plenary votes from European Parliament DOCEO XML documents.
* This provides more recent data than the standard EP Open Data API, which has
* a publication delay of several weeks for roll-call voting data.
*
* **Data Sources:**
* - RCV (Roll-Call Votes): Individual MEP positions by political group
* - VOT (Vote Results): Aggregate tallies with vote outcomes
*
* **Intelligence Perspective:** Near-real-time voting intelligence enabling rapid
* coalition analysis, political group cohesion tracking, and early detection of
* political shifts within hours of votes being cast.
*
* **Business Perspective:** Premium data freshness differentiator — provides
* vote data days/weeks before the EP Open Data API publishes it.
*
* ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
*/
import { z } from 'zod';
import { doceoClient } from '../clients/ep/doceoClient.js';
import { buildToolResponse } from './shared/responseBuilder.js';
import { ToolError } from './shared/errors.js';
import type { ToolResult } from './shared/types.js';
/** Returns true when str is a real calendar date (rejects e.g. "2026-13-40"). */
function isValidCalendarDate(str: string): boolean {
const d = new Date(`${str}T00:00:00Z`);
return !isNaN(d.getTime()) && d.toISOString().slice(0, 10) === str;
}
/** Returns true when str parses to a Monday (UTC). */
function isMonday(str: string): boolean {
return new Date(`${str}T00:00:00Z`).getUTCDay() === 1;
}
/**
* Input schema for get_latest_votes tool.
*/
export const GetLatestVotesSchema = z.object({
date: z.string()
.regex(/^\d{4}-\d{2}-\d{2}$/, 'Date must be in YYYY-MM-DD format')
.refine(isValidCalendarDate, { message: 'date must be a valid calendar date' })
.optional()
.describe('Specific date to fetch votes for (YYYY-MM-DD). Mutually exclusive with weekStart. If omitted, fetches the requested or most recent plenary week.'),
weekStart: z.string()
.regex(/^\d{4}-\d{2}-\d{2}$/, 'Date must be in YYYY-MM-DD format')
.refine(isValidCalendarDate, { message: 'weekStart must be a valid calendar date' })
.refine(isMonday, { message: 'weekStart must be a Monday (the start of the plenary week)' })
.optional()
.describe('Monday of a specific plenary week (YYYY-MM-DD). Mutually exclusive with date. Fetches Mon-Thu of that week.'),
term: z.number()
.int()
.min(1)
.max(15)
.optional()
.describe('Parliamentary term number (defaults to 10 for current 2024-2029 term)'),
includeIndividualVotes: z.boolean()
.optional()
.default(true)
.describe('Include individual MEP vote positions from roll-call data (default: true)'),
limit: z.number()
.int()
.min(1)
.max(100)
.default(50)
.describe('Maximum number of vote records to return'),
offset: z.number()
.int()
.min(0)
.default(0)
.describe('Pagination offset'),
}).strict().refine(
(data) => data.date === undefined || data.weekStart === undefined,
{
message: 'date and weekStart are mutually exclusive; provide only one, or omit both for the most recent plenary week',
path: ['weekStart'],
}
);
/**
* Handles the get_latest_votes MCP tool request.
*
* Fetches the latest plenary vote data from the EP DOCEO XML system,
* providing near-real-time access to roll-call votes and vote results.
* This data source is fresher than the EP Open Data API which has a
* multi-week publication delay.
*
* @param args - Raw tool arguments, validated against GetLatestVotesSchema
* @returns MCP tool result with latest vote records
*
* @example
* ```typescript
* // Get votes from the most recent plenary week
* const result = await handleGetLatestVotes({});
*
* // Get votes for a specific date
* const result = await handleGetLatestVotes({ date: '2026-04-27' });
*
* // Get a specific plenary week without individual MEP positions
* const result = await handleGetLatestVotes({
* weekStart: '2026-04-27',
* includeIndividualVotes: false
* });
* ```
*/
export async function handleGetLatestVotes(args: unknown): Promise<ToolResult> {
let params: z.infer<typeof GetLatestVotesSchema>;
try {
params = GetLatestVotesSchema.parse(args);
} catch (error: unknown) {
if (error instanceof z.ZodError) {
const fieldErrors = error.issues
.map(issue => {
const pathStr = issue.path.length > 0 ? issue.path.join('.') : '(root)';
return `${pathStr}: ${issue.message}`;
})
.join('; ');
throw new ToolError({
toolName: 'get_latest_votes',
operation: 'validateInput',
message: `Invalid parameters: ${fieldErrors}`,
isRetryable: false,
cause: error,
});
}
throw error;
}
try {
const result = await doceoClient.getLatestVotes({
date: params.date,
weekStart: params.weekStart,
term: params.term,
includeIndividualVotes: params.includeIndividualVotes,
limit: params.limit,
offset: params.offset,
});
return buildToolResponse(result);
} catch (error: unknown) {
throw new ToolError({
toolName: 'get_latest_votes',
operation: 'fetchData',
message: 'Failed to retrieve latest votes from DOCEO',
isRetryable: true,
cause: error instanceof Error ? error : undefined,
});
}
}
/**
* Tool metadata for MCP registration
*/
export const getLatestVotesToolMetadata = {
name: 'get_latest_votes',
description: 'Retrieve the latest plenary votes from EP DOCEO XML documents. Provides near-real-time access to roll-call votes (individual MEP positions by political group) and vote results (aggregate tallies). This data source is fresher than the EP Open Data API which has a multi-week publication delay. Use for up-to-date political intelligence on voting patterns, coalition analysis, and group cohesion tracking.',
inputSchema: {
type: 'object' as const,
properties: {
date: {
type: 'string',
description: 'Specific date to fetch votes for (YYYY-MM-DD). Mutually exclusive with weekStart. If omitted, fetches the requested or most recent plenary week (Mon-Thu).',
pattern: '^\\d{4}-\\d{2}-\\d{2}$'
},
weekStart: {
type: 'string',
description: 'Monday of a specific plenary week (YYYY-MM-DD). Mutually exclusive with date. Fetches Mon-Thu of that week.',
pattern: '^\\d{4}-\\d{2}-\\d{2}$'
},
term: {
type: 'number',
description: 'Parliamentary term number (defaults to 10 for current 2024-2029 term)',
minimum: 1,
maximum: 15
},
includeIndividualVotes: {
type: 'boolean',
description: 'Include individual MEP vote positions from roll-call data (default: true). Set to false for aggregate-only results.',
default: true
},
limit: {
type: 'number',
description: 'Maximum number of vote records to return (1-100)',
minimum: 1,
maximum: 100,
default: 50
},
offset: {
type: 'number',
description: 'Pagination offset',
minimum: 0,
default: 0
}
}
}
};
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