List Manufacturers

Instructions

Implementation Reference

• src/tools/list-manufacturers.ts:25-49 (handler)

  The handler callback for the 'list_manufacturers' tool. Accepts an optional 'material' input, calls listManufacturers(db, material), formats results as a markdown table, and returns them as text content.

    async ({ material }) => {
      const manufacturers = listManufacturers(db, material);
      const lines: string[] = [];
  
      if (material) {
        lines.push(
          `${manufacturers.length} manufacturer${manufacturers.length === 1 ? '' : 's'} producing ${material}:\n`,
        );
      } else {
        lines.push(
          `${manufacturers.length} manufacturer${manufacturers.length === 1 ? '' : 's'}:\n`,
        );
      }
  
      lines.push('| Manufacturer | Filaments |');
      lines.push('|---|---|');
      for (const m of manufacturers) {
        lines.push(`| ${m.name} | ${m.filament_count} |`);
      }
  
      return {
        content: [{ type: 'text' as const, text: lines.join('\n') }],
      };
    },
  );

• src/tools/list-manufacturers.ts:12-23 (schema)

  Input schema for 'list_manufacturers': optional 'material' string to filter manufacturers by material type.

  {
    title: 'List Manufacturers',
    description:
      'List all filament manufacturers in the database, with filament counts. Optionally filter to manufacturers that produce a specific material type.',
    inputSchema: {
      material: z
        .string()
        .optional()
        .describe(
          'Filter to manufacturers that produce this material type (e.g., "PLA", "PETG")',
        ),
    },

• src/tools/list-manufacturers.ts:6-49 (registration)

  Function 'registerListManufacturers' that registers the tool with the McpServer under the name 'list_manufacturers'.

  export function registerListManufacturers(
    server: McpServer,
    db: Database.Database,
  ): void {
    server.registerTool(
      'list_manufacturers',
      {
        title: 'List Manufacturers',
        description:
          'List all filament manufacturers in the database, with filament counts. Optionally filter to manufacturers that produce a specific material type.',
        inputSchema: {
          material: z
            .string()
            .optional()
            .describe(
              'Filter to manufacturers that produce this material type (e.g., "PLA", "PETG")',
            ),
        },
      },
      async ({ material }) => {
        const manufacturers = listManufacturers(db, material);
        const lines: string[] = [];
  
        if (material) {
          lines.push(
            `${manufacturers.length} manufacturer${manufacturers.length === 1 ? '' : 's'} producing ${material}:\n`,
          );
        } else {
          lines.push(
            `${manufacturers.length} manufacturer${manufacturers.length === 1 ? '' : 's'}:\n`,
          );
        }
  
        lines.push('| Manufacturer | Filaments |');
        lines.push('|---|---|');
        for (const m of manufacturers) {
          lines.push(`| ${m.name} | ${m.filament_count} |`);
        }
  
        return {
          content: [{ type: 'text' as const, text: lines.join('\n') }],
        };
      },
    );

• src/server.ts:45-50 (registration)

  Registration call in the server: registerListManufacturers(server, db) wires the tool to the server.

  registerListManufacturers(server, db);
  registerListMaterials(server, db);
  registerGetMaterialProfile(server, db);
  registerCompareMaterials(server, db);
  registerRecommendMaterial(server, db);
  registerDiagnosePrintIssue(server, db);

• src/data/db.ts:204-237 (helper)

  The 'listManufacturers' helper function that queries the database (with optional material filter) and returns ManufacturerRow[]. Also shows the ManufacturerRow interface.

  export interface ManufacturerRow {
    id: number;
    name: string;
    website: string | null;
    country: string | null;
    filament_count: number;
  }
  
  export function listManufacturers(
    db: Database.Database,
    materialFilter?: string,
  ): ManufacturerRow[] {
    if (materialFilter) {
      return db
        .prepare(
          `SELECT m.*, COUNT(f.id) AS filament_count
           FROM manufacturers m
           JOIN filaments f ON f.manufacturer_id = m.id
           WHERE f.material_name = ?
           GROUP BY m.id
           ORDER BY m.name`,
        )
        .all(materialFilter) as ManufacturerRow[];
    }
    return db
      .prepare(
        `SELECT m.*, COUNT(f.id) AS filament_count
         FROM manufacturers m
         JOIN filaments f ON f.manufacturer_id = m.id
         GROUP BY m.id
         ORDER BY m.name`,
      )
      .all() as ManufacturerRow[];
  }