@cyanheads/pubmed-mcp-server/dist/mcp-server/resources/definitions/database-info.resource.js

Search PubMed/Europe PMC, fetch articles and full text (PMC/EPMC/Unpaywall), citations, MeSH terms via MCP. STDIO or Streamable HTTP.

/**
 * @fileoverview Resource exposing PubMed database metadata via NCBI EInfo.
 * Returns field list, record count, last update date, and description.
 * @module src/mcp-server/resources/definitions/database-info.resource
 */
import { resource, z } from '@cyanheads/mcp-ts-core';
import { getNcbiService } from '../../../services/ncbi/ncbi-service.js';
import { ensureArray, getText } from '../../../services/ncbi/parsing/xml-helpers.js';
const FieldSchema = z
    .object({
    name: z.string().describe('Short field name used in queries'),
    fullName: z.string().optional().describe('Full display name'),
    description: z.string().optional().describe('Field description'),
})
    .describe('Searchable field entry');
const OutputSchema = z.object({
    dbName: z.string().describe('Database name'),
    description: z.string().optional().describe('Database description'),
    count: z.string().optional().describe('Total record count'),
    lastUpdate: z.string().optional().describe('Last update timestamp'),
    fields: z.array(FieldSchema).optional().describe('Searchable fields available in this database'),
});
export const databaseInfoResource = resource('pubmed://database/info', {
    name: 'database-info',
    title: 'PubMed Database Info',
    description: 'PubMed database metadata including field list, last update date, and record count.',
    mimeType: 'application/json',
    params: z.object({}),
    output: OutputSchema,
    async handler(_params, ctx) {
        ctx.log.info('Fetching PubMed database info');
        const raw = (await getNcbiService().eInfo({ db: 'pubmed' }, { signal: ctx.signal }));
        const eInfoResult = (raw.eInfoResult ?? raw);
        const dbInfo = (eInfoResult.DbInfo ?? eInfoResult);
        const dbName = getText(dbInfo.DbName, 'pubmed');
        const description = getText(dbInfo.Description) || undefined;
        const count = getText(dbInfo.Count) || undefined;
        const lastUpdate = getText(dbInfo.LastUpdate) || undefined;
        const fieldListContainer = dbInfo.FieldList;
        let fields;
        if (fieldListContainer) {
            const rawFields = ensureArray(fieldListContainer.Field);
            fields = rawFields.map((f) => ({
                name: getText(f.Name),
                fullName: getText(f.FullName) || undefined,
                description: getText(f.Description) || undefined,
            }));
        }
        ctx.log.info('PubMed database info retrieved', {
            dbName,
            fieldCount: fields?.length ?? 0,
        });
        return { dbName, description, count, lastUpdate, fields };
    },
    list: () => ({
        resources: [{ uri: 'pubmed://database/info', name: 'PubMed Database Info' }],
    }),
});
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