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* MCP Tool: analyze_country_delegation
*
* Analyze how a country's MEP delegation votes, collaborates, and
* distributes across political groups—revealing national voting patterns
* and cross-group alignment within a member state's EP representation.
*
* **Intelligence Perspective:** Country delegation analysis uncovers national
* interest patterns that cut across political group lines—essential for
* identifying when national priorities override party discipline.
*
* **Business Perspective:** Enables government affairs teams to understand
* a country's collective position on policy domains for targeted advocacy.
*
* ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
*/
import { z } from 'zod';
import { epClient } from '../clients/europeanParliamentClient.js';
import type { MEPDetails } from '../types/europeanParliament.js';
import type { ToolResult } from './shared/types.js';
/**
* Schema for analyze_country_delegation tool input
*/
export const AnalyzeCountryDelegationSchema = z.object({
country: z.string()
.length(2)
.regex(/^[A-Z]{2}$/, 'Country code must be 2 uppercase letters')
.describe('ISO 3166-1 alpha-2 country code (e.g., "SE", "DE", "FR")'),
dateFrom: z.string()
.regex(/^\d{4}-\d{2}-\d{2}$/, 'Date must be in YYYY-MM-DD format')
.optional()
.describe('Start date for analysis period'),
dateTo: z.string()
.regex(/^\d{4}-\d{2}-\d{2}$/, 'Date must be in YYYY-MM-DD format')
.optional()
.describe('End date for analysis period')
});
/**
* Political group distribution entry
*/
interface GroupDistribution {
group: string;
count: number;
percentage: number;
}
/**
* Country delegation analysis result
*/
interface CountryDelegationAnalysis {
country: string;
period: { from: string; to: string };
delegation: {
totalMEPs: number;
activeMEPs: number;
groupDistribution: GroupDistribution[];
};
votingBehavior: {
averageAttendance: number;
averageLoyalty: number;
nationalCohesion: number;
};
committeePresence: {
committeesRepresented: number;
leadershipRoles: number;
};
computedAttributes: {
delegationInfluence: string;
nationalCohesionLevel: string;
groupFragmentation: string;
engagementLevel: string;
};
confidenceLevel: 'HIGH' | 'MEDIUM' | 'LOW';
dataFreshness: string;
sourceAttribution: string;
methodology: string;
dataQualityWarnings: string[];
}
/**
* Compute group distribution from MEP list
*/
function computeGroupDistribution(
meps: { politicalGroup: string }[]
): GroupDistribution[] {
const counts = new Map<string, number>();
for (const mep of meps) {
const group = mep.politicalGroup;
counts.set(group, (counts.get(group) ?? 0) + 1);
}
const total = meps.length;
return Array.from(counts.entries())
.map(([group, count]) => ({
group,
count,
percentage: Math.round((count / Math.max(1, total)) * 10000) / 100
}))
.sort((a, b) => b.count - a.count);
}
/**
* Compute group fragmentation index (Simpson's diversity)
*/
function computeFragmentation(distribution: GroupDistribution[]): string {
const total = distribution.reduce((s, d) => s + d.count, 0);
if (total === 0) return 'UNKNOWN';
let sumSquares = 0;
for (const d of distribution) {
const p = d.count / total;
sumSquares += p * p;
}
const diversity = 1 - sumSquares;
if (diversity > 0.7) return 'HIGH';
if (diversity > 0.4) return 'MODERATE';
return 'LOW';
}
/**
* Compute delegation influence level
*/
function computeInfluence(totalMEPs: number, leadershipRoles: number): string {
const score = totalMEPs * 0.3 + leadershipRoles * 5;
if (score > 30) return 'HIGH';
Iif (score > 15) return 'MODERATE';
return 'LOW';
}
/**
* Compute confidence level from data coverage ratio
*/
function computeDataConfidence(dataCoverage: number): 'HIGH' | 'MEDIUM' | 'LOW' {
if (dataCoverage > 0.8) return 'HIGH';
if (dataCoverage > 0.4) return 'MEDIUM';
return 'LOW';
}
/**
* Compute engagement level from attendance
*/
function computeEngagement(avgAttendance: number): string {
if (avgAttendance >= 80) return 'HIGH';
Iif (avgAttendance >= 60) return 'MODERATE';
return 'LOW';
}
/**
* Compute national cohesion level
*/
function computeCohesionLevel(cohesion: number): string {
if (cohesion >= 70) return 'HIGH';
Iif (cohesion >= 50) return 'MODERATE';
return 'LOW';
}
/**
* Fetch MEP details, collecting fulfilled results
*/
async function fetchMepDetails(
meps: { id: string }[]
): Promise<MEPDetails[]> {
const details: MEPDetails[] = [];
const batch = meps.slice(0, 50);
const batchSize = 5;
for (let i = 0; i < batch.length; i += batchSize) {
const chunk = batch.slice(i, i + batchSize);
const results = await Promise.allSettled(
chunk.map((mep: { id: string }) => epClient.getMEPDetails(mep.id))
);
for (const r of results) {
if (r.status === 'fulfilled') {
details.push(r.value);
}
}
}
return details;
}
/**
* Compute committee presence from MEP details
*/
function computeCommitteePresence(
details: MEPDetails[]
): { committeesRepresented: number; leadershipRoles: number } {
const allCommittees = new Set<string>();
let leadershipRoles = 0;
for (const mep of details) {
for (const c of mep.committees) {
allCommittees.add(c);
}
if (Array.isArray(mep.roles)) {
leadershipRoles += mep.roles.length;
}
}
return { committeesRepresented: allCommittees.size, leadershipRoles };
}
/**
* Build delegation analysis from MEP details
*/
async function buildDelegationAnalysis(
country: string,
dateFrom: string,
dateTo: string
): Promise<CountryDelegationAnalysis> {
const mepResult = await epClient.getCurrentMEPs({
country,
limit: 100
});
const meps = Array.isArray(mepResult.data) ? mepResult.data : [];
const totalMEPs = meps.length;
const details = await fetchMepDetails(meps as { id: string }[]);
const distribution = computeGroupDistribution(
meps as { politicalGroup: string }[]
);
// Compute attendance averages
const attendances = details
.map(d => d.votingStatistics?.attendanceRate)
.filter((a): a is number => a !== undefined);
const avgAttendance = attendances.length > 0
? Math.round(attendances.reduce((s, a) => s + a, 0) / attendances.length * 100) / 100
: 0;
const committeePresence = computeCommitteePresence(details);
// National cohesion - approximated from group concentration.
// The +10 baseline accounts for empirical national-interest cohesion (e.g., structural funds,
// CAP allocations) that cross-cuts political group lines even in fragmented delegations.
const topGroupShare = distribution[0]?.percentage ?? 0;
const nationalCohesion = Math.min(100, topGroupShare + 10);
// Confidence based on data coverage, not just delegation size
const dataCoverage = totalMEPs > 0 ? attendances.length / totalMEPs : 0;
return {
country,
period: { from: dateFrom, to: dateTo },
delegation: {
totalMEPs,
activeMEPs: totalMEPs,
groupDistribution: distribution
},
votingBehavior: {
averageAttendance: avgAttendance,
// Loyalty approximated from group fragmentation; detailed roll-call analysis not yet available
averageLoyalty: Math.round(Math.max(60, 95 - distribution.length * 5) * 100) / 100,
nationalCohesion: Math.round(nationalCohesion * 100) / 100
},
committeePresence,
computedAttributes: {
delegationInfluence: computeInfluence(totalMEPs, committeePresence.leadershipRoles),
nationalCohesionLevel: computeCohesionLevel(nationalCohesion),
groupFragmentation: computeFragmentation(distribution),
engagementLevel: computeEngagement(avgAttendance)
},
confidenceLevel: computeDataConfidence(dataCoverage),
dataFreshness: 'Real-time EP API data — country delegation composition from current MEP records',
sourceAttribution: 'European Parliament Open Data Portal - data.europarl.europa.eu',
methodology: 'Country delegation analysis using EP Open Data: political group distribution, '
+ 'voting behavior aggregation, committee representation mapping, and national cohesion scoring. '
+ 'Data source: European Parliament Open Data Portal.',
dataQualityWarnings: [
...(dataCoverage < 1 ? [`Voting statistics available for ${String(Math.round(dataCoverage * 100))}% of delegation MEPs`] : []),
'National cohesion includes +10 baseline offset (proxy for national-interest voting beyond group lines)',
...(attendances.length === 0 ? ['No MEP voting statistics available — attendance is unavailable and loyalty is a proxy-derived estimate based on group fragmentation'] : []),
],
};
}
/**
* Handles the analyze_country_delegation MCP tool request.
*
* Analyses an EU member state's MEP delegation in the European Parliament, covering
* political group distribution, aggregate voting behaviour, committee presence, and a
* national cohesion score. Reveals national interest patterns that can cut across
* political group lines, supporting targeted government-affairs advocacy.
*
* @param args - Raw tool arguments, validated against {@link AnalyzeCountryDelegationSchema}
* @returns MCP tool result containing a {@link CountryDelegationAnalysis} object with
* delegation breakdown, computed attributes, confidence level, and methodology note
* @throws - If `args` fails schema validation (e.g., missing required `country`, non-uppercase code)
* - If the European Parliament API is unreachable or returns an error response
*
* @example
* ```typescript
* const result = await handleAnalyzeCountryDelegation({
* country: 'SE',
* dateFrom: '2024-01-01',
* dateTo: '2024-12-31'
* });
* // Returns political group distribution, voting behaviour, and cohesion score for Sweden's MEPs
* ```
*
* @security Input is validated with Zod before any API call.
* Country code is validated against a strict regex to prevent injection.
* 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 analyzeCountryDelegationToolMetadata} for MCP schema registration
* @see {@link handleAnalyzeCommitteeActivity} for per-committee workload analysis
*/
export async function handleAnalyzeCountryDelegation(
args: unknown
): Promise<ToolResult> {
const params = AnalyzeCountryDelegationSchema.parse(args);
const now = new Date();
const dateFrom = params.dateFrom ?? new Date(
now.getFullYear() - 1,
now.getMonth(),
now.getDate()
).toISOString().split('T')[0] ?? '';
const dateTo = params.dateTo ?? now.toISOString().split('T')[0] ?? '';
const analysis = await buildDelegationAnalysis(
params.country,
dateFrom,
dateTo
);
return {
content: [
{
type: 'text',
text: JSON.stringify(analysis, null, 2)
}
]
};
}
/**
* Tool metadata for MCP listing
*/
export const analyzeCountryDelegationToolMetadata = {
name: 'analyze_country_delegation',
description: 'Analyze a country\'s MEP delegation in the European Parliament — political group distribution, voting behavior, committee presence, and national cohesion. Reveals national interest patterns that cut across party lines.',
inputSchema: {
type: 'object' as const,
properties: {
country: {
type: 'string',
description: 'ISO 3166-1 alpha-2 country code (e.g., "SE", "DE", "FR")'
},
dateFrom: {
type: 'string',
description: 'Start date (YYYY-MM-DD)'
},
dateTo: {
type: 'string',
description: 'End date (YYYY-MM-DD)'
}
},
required: ['country']
}
};
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