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* MCP Resources for European Parliament Data Access
*
* Resource templates and handlers for direct EP data access via MCP resources.
* Resources provide a standardized way to read EP data using URI patterns.
*
* **Intelligence Perspective:** Resources enable direct data access for intelligence
* pipelines—bypassing tool call overhead for known-entity lookups and bulk retrieval.
*
* **Business Perspective:** Resource URIs provide stable, addressable data endpoints
* that enterprise integrations can cache, bookmark, and reference programmatically.
*
* ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
*
* @see https://spec.modelcontextprotocol.io/specification/server/resources/
*/
import { z } from 'zod';
import { epClient } from '../clients/europeanParliamentClient.js';
/**
* Resource template metadata for MCP listing
*/
export interface ResourceTemplate {
uriTemplate: string;
name: string;
description: string;
mimeType: string;
}
/**
* Resource content result
*/
export interface ResourceContent {
uri: string;
mimeType: string;
text: string;
}
/**
* Resource read result
*/
export interface ResourceReadResult {
contents: ResourceContent[];
[key: string]: unknown;
}
// ─── Resource Templates ──────────────────────────────────────
const mepResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://meps/{mepId}',
name: 'MEP Profile',
description: 'European Parliament Member profile including biographical info, committee memberships, political group, and contact details.',
mimeType: 'application/json'
};
const mepListResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://meps',
name: 'MEP List',
description: 'List of current Members of the European Parliament with basic profile information.',
mimeType: 'application/json'
};
const committeeResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://committees/{committeeId}',
name: 'Committee Information',
description: 'European Parliament committee details including membership, leadership, and responsibilities.',
mimeType: 'application/json'
};
const plenarySessionsResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://plenary-sessions',
name: 'Plenary Sessions',
description: 'Recent European Parliament plenary sessions with dates, locations, and agenda items.',
mimeType: 'application/json'
};
const votingRecordResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://votes/{sessionId}',
name: 'Voting Record',
description: 'Voting records for a specific plenary session including vote breakdowns and results.',
mimeType: 'application/json'
};
const politicalGroupsResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://political-groups',
name: 'Political Groups',
description: 'European Parliament political groups with membership counts and leadership.',
mimeType: 'application/json'
};
const procedureResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://procedures/{procedureId}',
name: 'Procedure Details',
description: 'Legislative procedure details by process ID (format: YYYY-NNNN).',
mimeType: 'application/json'
};
const plenaryDetailResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://plenary/{plenaryId}',
name: 'Plenary Session Detail',
description: 'Specific plenary session details by session ID.',
mimeType: 'application/json'
};
const documentResourceTemplate: ResourceTemplate = {
uriTemplate: 'ep://documents/{documentId}',
name: 'Legislative Document',
description: 'Legislative document details by document ID.',
mimeType: 'application/json'
};
// ─── URI Validation ──────────────────────────────────────────
const MepIdSchema = z.string().min(1).max(100);
/** Generic resource ID validator (reused for procedures, plenary sessions, documents) */
const ResourceIdSchema = z.string().min(1).max(200);
/**
* Procedure ID schema — enforces the YYYY-NNNN format expected by the EP API
* `/procedures/{process-id}` endpoint (e.g. `"2024-0006"`).
*/
const ProcedureIdSchema = ResourceIdSchema.regex(
/^\d{4}-\d{4}$/,
'Procedure ID must be in YYYY-NNNN format (e.g. "2024-0006")'
);
/**
* Match MEP resource URIs
*/
function matchMepUri(segments: string[]): { template: string; params: Record<string, string> } | null {
if (segments[0] !== 'meps') return null;
if (segments.length === 2 && segments[1] !== '') {
return { template: 'mep_detail', params: { mepId: segments[1] ?? '' } };
}
if (segments.length === 1) {
return { template: 'mep_list', params: {} };
}
return null;
}
/**
* Match committee/session/vote resource URIs
*/
function matchOtherUri(segments: string[]): { template: string; params: Record<string, string> } | null {
const resource = segments[0];
if (resource === 'committees') {
return matchCommitteeUri(segments);
}
if (resource === 'plenary-sessions' && segments.length === 1) {
return { template: 'plenary_sessions', params: {} };
}
if (resource === 'votes') {
return matchVoteUri(segments);
}
if (resource === 'political-groups' && segments.length === 1) {
return { template: 'political_groups', params: {} };
}
// Extended URI patterns — all listed in getResourceTemplateArray and
// discoverable via MCP ListResourceTemplates
if (resource === 'procedures') {
return matchProcedureUri(segments);
}
if (resource === 'plenary') {
return matchPlenaryDetailUri(segments);
}
if (resource === 'documents') {
return matchDocumentUri(segments);
}
return null;
}
/**
* Match committee URI
*/
function matchCommitteeUri(segments: string[]): { template: string; params: Record<string, string> } | null {
Eif (segments.length === 2 && segments[1] !== '') {
return { template: 'committee_detail', params: { committeeId: segments[1] ?? '' } };
}
return null;
}
/**
* Match vote URI
*/
function matchVoteUri(segments: string[]): { template: string; params: Record<string, string> } | null {
Eif (segments.length === 2 && segments[1] !== '') {
return { template: 'voting_record', params: { sessionId: segments[1] ?? '' } };
}
return null;
}
/**
* Match procedure detail URI: ep://procedures/{id}
*/
function matchProcedureUri(segments: string[]): { template: string; params: Record<string, string> } | null {
if (segments.length === 2 && segments[1] !== '') {
return { template: 'procedure_detail', params: { procedureId: segments[1] ?? '' } };
}
return null;
}
/**
* Match plenary detail URI: ep://plenary/{id}
*/
function matchPlenaryDetailUri(segments: string[]): { template: string; params: Record<string, string> } | null {
Eif (segments.length === 2 && segments[1] !== '') {
return { template: 'plenary_detail', params: { plenaryId: segments[1] ?? '' } };
}
return null;
}
/**
* Match document detail URI: ep://documents/{id}
*/
function matchDocumentUri(segments: string[]): { template: string; params: Record<string, string> } | null {
Eif (segments.length === 2 && segments[1] !== '') {
return { template: 'document_detail', params: { documentId: segments[1] ?? '' } };
}
return null;
}
/**
* Parse a resource URI and extract template parameters
*/
function parseResourceUri(uri: string): { template: string; params: Record<string, string> } {
// Validate URI format
if (!uri.startsWith('ep://')) {
throw new Error(`Invalid resource URI scheme: ${uri}. Must start with "ep://"`);
}
const path = uri.slice(5); // Remove 'ep://'
const segments = path.split('/');
if (segments.length === 0 || segments[0] === '') {
throw new Error(`Invalid resource URI: ${uri}`);
}
const mepMatch = matchMepUri(segments);
if (mepMatch !== null) return mepMatch;
const otherMatch = matchOtherUri(segments);
if (otherMatch !== null) return otherMatch;
throw new Error(`Unknown resource URI: ${uri}`);
}
// ─── Resource Handlers ───────────────────────────────────────
/**
* Handle MEP detail resource request
*
* @param mepId - MEP identifier to look up
* @returns Resource content with MEP details as JSON
*/
async function handleMepDetail(mepId: string): Promise<ResourceContent> {
const validId = MepIdSchema.parse(mepId);
const data = await epClient.getMEPDetails(validId);
return {
uri: `ep://meps/${validId}`,
mimeType: 'application/json',
text: JSON.stringify({
...data,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle MEP list resource request
*
* @returns Resource content with paginated MEP list as JSON
*/
async function handleMepList(): Promise<ResourceContent> {
const data = await epClient.getMEPs({ limit: 50 });
return {
uri: 'ep://meps',
mimeType: 'application/json',
text: JSON.stringify({
...data,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle committee detail resource request
*
* @param committeeId - Committee identifier or abbreviation
* @returns Resource content with committee details as JSON
*/
async function handleCommitteeDetail(committeeId: string): Promise<ResourceContent> {
const validId = MepIdSchema.parse(committeeId);
const data = await epClient.getCommitteeInfo({ abbreviation: validId });
return {
uri: `ep://committees/${validId}`,
mimeType: 'application/json',
text: JSON.stringify({
...data,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle plenary sessions resource request
*
* @returns Resource content with recent plenary sessions as JSON
*/
async function handlePlenarySessions(): Promise<ResourceContent> {
const data = await epClient.getPlenarySessions({ limit: 20 });
return {
uri: 'ep://plenary-sessions',
mimeType: 'application/json',
text: JSON.stringify({
...data,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle voting record resource request
*
* @param sessionId - Session identifier for vote retrieval
* @returns Resource content with voting records as JSON
*/
async function handleVotingRecord(sessionId: string): Promise<ResourceContent> {
const validId = MepIdSchema.parse(sessionId);
const data = await epClient.getVotingRecords({ sessionId: validId });
return {
uri: `ep://votes/${validId}`,
mimeType: 'application/json',
text: JSON.stringify({
...data,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle political groups resource request
*
* @returns Resource content with political group composition as JSON
*/
async function handlePoliticalGroups(): Promise<ResourceContent> {
const data = await epClient.getMEPs({ limit: 100 });
// Extract unique political groups from MEP data
const groups = new Map<string, number>();
Eif (Array.isArray(data.data)) {
for (const mep of data.data) {
const group = (mep as { politicalGroup?: string }).politicalGroup ?? 'Unknown';
groups.set(group, (groups.get(group) ?? 0) + 1);
}
}
const groupList = Array.from(groups.entries()).map(([name, memberCount]) => ({
name,
memberCount
}));
return {
uri: 'ep://political-groups',
mimeType: 'application/json',
text: JSON.stringify({
politicalGroups: groupList,
total: groupList.length,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle procedure detail resource request (extended URI: ep://procedures/{procedureId})
*
* @param procedureId - Legislative procedure identifier (process-id format YYYY-NNNN)
* @returns Resource content with procedure details as JSON
*/
async function handleProcedureDetail(procedureId: string): Promise<ResourceContent> {
const validId = ProcedureIdSchema.parse(procedureId);
const data = await epClient.getProcedureById(validId);
return {
uri: `ep://procedures/${validId}`,
mimeType: 'application/json',
text: JSON.stringify({
...data,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle plenary detail resource request (extended URI: ep://plenary/{plenaryId})
*
* Uses {@link EuropeanParliamentClient#getMeetingById} for a direct ID-based
* lookup. Throws a not-found error if the EP API returns no matching session.
*
* @param plenaryId - Plenary session / meeting identifier
* @returns Resource content with plenary session details as JSON
*/
async function handlePlenaryDetail(plenaryId: string): Promise<ResourceContent> {
const validId = ResourceIdSchema.parse(plenaryId);
const session = await epClient.getMeetingById(validId);
return {
uri: `ep://plenary/${validId}`,
mimeType: 'application/json',
text: JSON.stringify({
plenaryId: validId,
session,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
/**
* Handle document detail resource request (extended URI: ep://documents/{documentId})
*
* @param documentId - Legislative document identifier
* @returns Resource content with document details as JSON
*/
async function handleDocumentDetail(documentId: string): Promise<ResourceContent> {
const validId = ResourceIdSchema.parse(documentId);
const data = await epClient.getDocumentById(validId);
return {
uri: `ep://documents/${validId}`,
mimeType: 'application/json',
text: JSON.stringify({
...data,
_source: 'European Parliament Open Data Portal',
_accessedAt: new Date().toISOString()
}, null, 2)
};
}
// ─── Public API ──────────────────────────────────────────────
/**
* Get all resource template metadata for MCP listing
*/
export function getResourceTemplateArray(): ResourceTemplate[] {
return [
mepResourceTemplate,
mepListResourceTemplate,
committeeResourceTemplate,
plenarySessionsResourceTemplate,
votingRecordResourceTemplate,
politicalGroupsResourceTemplate,
procedureResourceTemplate,
plenaryDetailResourceTemplate,
documentResourceTemplate,
];
}
/**
* Validate and extract required parameter from params
*/
function requireParam(params: Record<string, string>, key: string, uriPattern: string): string {
const value = params[key];
Iif (value === undefined || value === '') {
throw new Error(`${key} is required for ${uriPattern}`);
}
return value;
}
/**
* Handle ReadResource request
*
* @param uri - Resource URI (e.g., "ep://meps/12345")
* @returns Resource content
* @throws Error if URI is invalid or resource not found
*/
export async function handleReadResource(uri: string): Promise<ResourceReadResult> {
const { template, params } = parseResourceUri(uri);
let content: ResourceContent;
switch (template) {
case 'mep_detail':
content = await handleMepDetail(requireParam(params, 'mepId', 'ep://meps/{mepId}'));
break;
case 'mep_list':
content = await handleMepList();
break;
case 'committee_detail':
content = await handleCommitteeDetail(requireParam(params, 'committeeId', 'ep://committees/{committeeId}'));
break;
case 'plenary_sessions':
content = await handlePlenarySessions();
break;
case 'voting_record':
content = await handleVotingRecord(requireParam(params, 'sessionId', 'ep://votes/{sessionId}'));
break;
case 'political_groups':
content = await handlePoliticalGroups();
break;
case 'procedure_detail':
content = await handleProcedureDetail(requireParam(params, 'procedureId', 'ep://procedures/{procedureId}'));
break;
case 'plenary_detail':
content = await handlePlenaryDetail(requireParam(params, 'plenaryId', 'ep://plenary/{plenaryId}'));
break;
case 'document_detail':
content = await handleDocumentDetail(requireParam(params, 'documentId', 'ep://documents/{documentId}'));
break;
default:
throw new Error(`Unhandled resource template: ${template}`);
}
return { contents: [content] };
}
/** Export parseResourceUri for testing */
export { parseResourceUri };
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