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7dc28be | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | import type { FastMCP } from 'fastmcp';
import { UserError } from 'fastmcp';
import { z } from 'zod';
import { getGmailClient } from '../../clients.js';
import { findHeaderValue } from './helpers.js';
export function register(server: FastMCP) {
server.addTool({
name: 'listMessages',
description:
'Lists Gmail messages for the authenticated user. Supports the full Gmail search syntax via the q parameter (e.g. "is:unread", "from:alice@example.com", "subject:invoice newer_than:7d"). Returns message IDs with sender, subject, date, and snippet for each result.',
parameters: z.strictObject({
maxResults: z
.number()
.int()
.min(1)
.max(100)
.optional()
.default(10)
.describe('Maximum number of messages to return (1-100). Defaults to 10.'),
q: z
.string()
.optional()
.describe(
'Gmail search query using the same syntax as the Gmail search box. Examples: "is:unread", "from:boss@acme.com", "has:attachment newer_than:3d".'
),
labelIds: z
.array(z.string())
.optional()
.describe(
'Only return messages with these label IDs (e.g. ["INBOX"], ["STARRED"]). Use listLabels to discover custom label IDs.'
),
includeSpamTrash: z
.boolean()
.optional()
.default(false)
.describe('If true, also include messages from SPAM and TRASH.'),
}),
execute: async (args, { log }) => {
const gmail = await getGmailClient();
log.info(
`Listing Gmail messages (max=${args.maxResults}, q=${args.q ?? 'none'}, labels=${
args.labelIds?.join(',') ?? 'none'
})`
);
try {
const listResponse = await gmail.users.messages.list({
userId: 'me',
maxResults: args.maxResults,
q: args.q,
labelIds: args.labelIds,
includeSpamTrash: args.includeSpamTrash,
});
const messageRefs = listResponse.data.messages ?? [];
if (messageRefs.length === 0) {
return JSON.stringify(
{
messages: [],
resultSizeEstimate: listResponse.data.resultSizeEstimate ?? 0,
nextPageToken: listResponse.data.nextPageToken ?? null,
},
null,
2
);
}
const detailed = await Promise.all(
messageRefs.map((ref) =>
gmail.users.messages.get({
userId: 'me',
id: ref.id!,
format: 'metadata',
metadataHeaders: ['From', 'To', 'Subject', 'Date'],
})
)
);
const messages = detailed.map((response) => {
const msg = response.data;
const headers = msg.payload?.headers;
return {
id: msg.id,
threadId: msg.threadId,
labelIds: msg.labelIds ?? [],
snippet: msg.snippet ?? '',
from: findHeaderValue(headers, 'From'),
to: findHeaderValue(headers, 'To'),
subject: findHeaderValue(headers, 'Subject'),
date: findHeaderValue(headers, 'Date'),
};
});
return JSON.stringify(
{
messages,
resultSizeEstimate: listResponse.data.resultSizeEstimate ?? messages.length,
nextPageToken: listResponse.data.nextPageToken ?? null,
},
null,
2
);
} catch (error: any) {
log.error(`Error listing Gmail messages: ${error.message || error}`);
if (error.code === 401)
throw new UserError(
'Gmail authorization failed. Re-authorize the MCP server (scopes may have changed).'
);
if (error.code === 403)
throw new UserError(
'Permission denied. Confirm the Gmail API is enabled and the gmail.modify scope was granted during consent.'
);
throw new UserError(`Failed to list Gmail messages: ${error.message || 'Unknown error'}`);
}
},
});
}
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