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* MCP Tool: search_documents
*
* Search European Parliament legislative documents or retrieve a single document by ID.
*
* **Intelligence Perspective:** Essential for legislative monitoring, policy tracking,
* amendment analysis, and building intelligence products around EU regulatory developments.
*
* **Business Perspective:** Enables document search products for legal firms, compliance
* teams, and regulatory intelligence services requiring legislative text access.
*
* **Marketing Perspective:** Demonstrates comprehensive document search capability—
* key for attracting legal tech, RegTech, and policy research customer segments.
*
* **EP API Endpoints:**
* - `GET /documents` (list/search)
* - `GET /documents/{doc-id}` (single)
*
* ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
*/
import { SearchDocumentsSchema, LegislativeDocumentSchema, 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 search_documents MCP tool request.
*
* Searches European Parliament legislative documents by keyword and optional filters, or
* retrieves a single document by `docId`. Supports filtering by document type, date range,
* and responsible committee. Returned document metadata includes titles, authors, status,
* and links to PDF/XML versions.
*
* @param args - Raw tool arguments, validated against {@link SearchDocumentsSchema}
* @returns MCP tool result containing matching legislative documents or a single document
* @throws - If `args` fails schema validation (e.g., keyword exceeds 200 chars, bad date format)
* - If the European Parliament API is unreachable or returns an error response
*
* @example
* ```typescript
* // Full-text keyword search with filters
* const result = await handleSearchDocuments({
* keyword: 'climate change',
* documentType: 'REPORT',
* dateFrom: '2024-01-01',
* limit: 20
* });
* // Returns up to 20 EP reports matching "climate change" from 2024 onwards
*
* // Single document lookup by ID
* const doc = await handleSearchDocuments({ docId: 'A9-0234/2024' });
* // Returns the full metadata for document A9-0234/2024
* ```
*
* @security Input is validated with Zod before any API call.
* Keyword pattern is restricted to alphanumeric characters, spaces, hyphens, and underscores
* 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 searchDocumentsToolMetadata} for MCP schema registration
* @see {@link handleGetExternalDocuments} for non-EP (external) document retrieval
*/
export async function handleSearchDocuments(
args: unknown
): Promise<ToolResult> {
// Validate input — ZodErrors here are client mistakes (non-retryable)
let params: ReturnType<typeof SearchDocumentsSchema.parse>;
try {
params = SearchDocumentsSchema.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: 'search_documents',
operation: 'validateInput',
message: `Invalid parameters: ${fieldErrors}`,
isRetryable: false,
cause: error,
});
}
throw error;
}
try {
// Single document lookup by ID
if (params.docId !== undefined) {
const result = await epClient.getDocumentById(params.docId);
const validated = LegislativeDocumentSchema.parse(result);
return buildToolResponse(validated);
}
// Search documents via EP API (only pass defined properties)
const apiParams = {
keyword: params.keyword ?? '',
limit: params.limit,
offset: params.offset,
...buildApiParams(params, [
{ from: 'documentType', to: 'documentType' },
{ from: 'dateFrom', to: 'dateFrom' },
{ from: 'dateTo', to: 'dateTo' },
{ from: 'committee', to: 'committee' },
]),
};
const result = await epClient.searchDocuments(apiParams as Parameters<typeof epClient.searchDocuments>[0]);
// Validate output
const outputSchema = PaginatedResponseSchema(LegislativeDocumentSchema);
const validated = outputSchema.parse(result);
return buildToolResponse(validated);
} catch (error: unknown) {
Iif (error instanceof z.ZodError) {
const fieldErrors = error.issues.map(e => `${e.path.join('.')}: ${e.message}`).join('; ');
throw new ToolError({
toolName: 'search_documents',
operation: 'validateOutput',
message: `Unexpected EP API response format: ${fieldErrors}`,
isRetryable: false,
cause: error,
});
}
throw new ToolError({
toolName: 'search_documents',
operation: 'fetchData',
message: 'Failed to search documents',
isRetryable: true,
cause: error,
});
}
}
/**
* Tool metadata for MCP registration
*/
export const searchDocumentsToolMetadata = {
name: 'search_documents',
description: 'Search European Parliament legislative documents by keyword, or retrieve a single document by docId. Filter by document type (REPORT, RESOLUTION, DECISION, DIRECTIVE, REGULATION, OPINION), date range, and committee. Returns document metadata including title, authors, status, and PDF/XML links.',
inputSchema: {
type: 'object' as const,
properties: {
docId: {
type: 'string',
description: 'Document ID for single document lookup (bypasses keyword search)'
},
keyword: {
type: 'string',
description: 'Search keyword or phrase (alphanumeric, spaces, hyphens, underscores only)',
minLength: 1,
maxLength: 200,
pattern: '^[a-zA-Z0-9\\s\\-_]+$'
},
documentType: {
type: 'string',
description: 'Filter by document type',
enum: ['REPORT', 'RESOLUTION', 'DECISION', 'DIRECTIVE', 'REGULATION', 'OPINION', 'AMENDMENT']
},
dateFrom: {
type: 'string',
description: 'Start date filter (YYYY-MM-DD format)',
pattern: '^\\d{4}-\\d{2}-\\d{2}$'
},
dateTo: {
type: 'string',
description: 'End date filter (YYYY-MM-DD format)',
pattern: '^\\d{4}-\\d{2}-\\d{2}$'
},
committee: {
type: 'string',
description: 'Committee identifier',
minLength: 1,
maxLength: 100
},
limit: {
type: 'number',
description: 'Maximum number of results to return (1-100)',
minimum: 1,
maximum: 100,
default: 20
},
offset: {
type: 'number',
description: 'Pagination offset',
minimum: 0,
default: 0
}
}
}
};
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