import type { FastMCP } from 'fastmcp';
import { UserError } from 'fastmcp';
import { z } from 'zod';
import { docs_v1 } from 'googleapis';
import { getDocsClient } from '../../clients.js';
import { DocumentIdParameter } from '../../types.js';
import * as GDocsHelpers from '../../googleDocsApiHelpers.js';
export function register(server: FastMCP) {
server.addTool({
name: 'insertText',
description:
"Inserts text at a specific character index within a document. Use readDocument with format='json' to determine the correct index.",
parameters: DocumentIdParameter.extend({
text: z.string().min(1).describe('The text to insert.'),
index: z
.number()
.int()
.min(1)
.describe(
"1-based character index within the document body. Use readDocument with format='json' to inspect indices."
),
tabId: z
.string()
.optional()
.describe(
'The ID of the specific tab to insert into. If not specified, inserts into the first tab (or legacy document.body for documents without tabs).'
),
}),
execute: async (args, { log }) => {
const docs = await getDocsClient();
log.info(
`Inserting text in doc ${args.documentId} at index ${args.index}${args.tabId ? ` (tab: ${args.tabId})` : ''}`
);
try {
if (args.tabId) {
// For tab-specific inserts, we need to verify the tab exists first
const docInfo = await docs.documents.get({
documentId: args.documentId,
includeTabsContent: true,
fields: 'tabs(tabProperties,documentTab)',
});
const targetTab = GDocsHelpers.findTabById(docInfo.data, args.tabId);
if (!targetTab) {
throw new UserError(`Tab with ID "${args.tabId}" not found in document.`);
}
if (!targetTab.documentTab) {
throw new UserError(
`Tab "${args.tabId}" does not have content (may not be a document tab).`
);
}
// Insert with tabId
const location: any = { index: args.index, tabId: args.tabId };
const request: docs_v1.Schema$Request = {
insertText: { location, text: args.text },
};
await GDocsHelpers.executeBatchUpdate(docs, args.documentId, [request]);
} else {
// Use existing helper for backward compatibility
await GDocsHelpers.insertText(docs, args.documentId, args.text, args.index);
}
return `Successfully inserted text at index ${args.index}${args.tabId ? ` in tab ${args.tabId}` : ''}.`;
} catch (error: any) {
log.error(`Error inserting text in doc ${args.documentId}: ${error.message || error}`);
if (error instanceof UserError) throw error;
throw new UserError(`Failed to insert text: ${error.message || 'Unknown error'}`);
}
},
});
}
