Lightdash MCP Server

Instructions

Implementation Reference

• src/mcp.ts:292-319 (handler)

  Handler for 'lightdash_get_catalog' tool: validates input with GetCatalogRequestSchema, calls Lightdash API GET /api/v1/projects/{projectUuid}/dataCatalog, returns JSON response or throws error.

  case 'lightdash_get_catalog': {
    const args = GetCatalogRequestSchema.parse(request.params.arguments);
    const { data, error } = await lightdashClient.GET(
      '/api/v1/projects/{projectUuid}/dataCatalog',
      {
        params: {
          path: {
            projectUuid: args.projectUuid,
          },
        },
      }
    );
    if (error) {
      throw new Error(
        `Lightdash API error: ${error.error.name}, ${
          error.error.message ?? 'no message'
        }`
      );
    }
    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(data.results, null, 2),
        },
      ],
    };
  }

• src/schemas.ts:50-57 (schema)

  Zod schema defining input for lightdash_get_catalog: requires projectUuid (UUID string).

  export const GetCatalogRequestSchema = z.object({
    projectUuid: z
      .string()
      .uuid()
      .describe(
        'The UUID of the project. You can obtain it from the project list.'
      ),
  });

• src/mcp.ts:79-83 (registration)

  Registration of 'lightdash_get_catalog' tool in the ListTools response, specifying name, description, and input schema.

  {
    name: 'lightdash_get_catalog',
    description: 'Get catalog for a project',
    inputSchema: zodToJsonSchema(GetCatalogRequestSchema),
  },