Nylas MCP by usefulapi
REMOTE · NYLAS.USEFULAPI.IO
MCP server for Nylas — read email, calendars, events and contacts, and send email or create events.
Available components
Last scanned (3 hours ago)
Scores higher than 4% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Communication
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not yet verified: we couldn't confirm whether this endpoint requires it. View diagnostics → Unverified
- HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability0
- Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly. See how to fix → View diagnostics → Fail
Schema Quality & AI Usability0
- Schema not yet verified: we couldn't read the endpoint's schema, or could read only part of its tool list.Unverified
Stability & Change Management0
- Stability not yet verified: not enough scan history yet (needs a 30-day window).Unverified
Tool Coverage0
- Tool coverage not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.Unverified
Tool Safety0
- Tool safety not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.Unverified
Capabilities0
- Capabilities not yet verified: we couldn't read the endpoint's capabilities.Unverified
Unverified: 5 categories
Categories scored 0 because we could not verify them: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.
Checks we ran (4)
- TLS certificate
- HSTS header
- DNSSEC
- Transport
Checks we could not complete (7)
These are gaps on our side, not findings about this hosted endpoint. We only credit what we can confirm, so a category made up entirely of them scores 0.
- Authorization in Endpoint SecurityAuthorisation not yet verified: we couldn't confirm whether this endpoint requires it.
- HTTPS in Endpoint SecurityHTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
- Schema quality in Schema Quality & AI Usability (scores 0 for this)Schema not yet verified: we couldn't read the endpoint's schema, or could read only part of its tool list.
- Stability in Stability & Change Management (scores 0 for this)Stability not yet verified: not enough scan history yet (needs a 30-day window).
- Tool coverage in Tool Coverage (scores 0 for this)Tool coverage not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.
- Tool safety in Tool Safety (scores 0 for this)Tool safety not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.
- Capabilities in Capabilities (scores 0 for this)Capabilities not yet verified: we couldn't read the endpoint's capabilities.
Does not apply to this hosted endpoint (2)
- Supply Chain SecurityScored on package channels only. This is a hosted endpoint, so there is nothing to install or inspect.
- Provenance & TransparencyScored on package channels only. This is a hosted endpoint, so there is nothing to install or inspect.
The score does not measure everything. What the score does not measure →
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 2 Nov 26 −62
- Endpoint reachability: reachable → not serving MCP ▼ security
- Stability: pass → unverified ▼ security
- Tool safety: pass → unverified ▼ security
- Authorization: pass → unverified ▼ security
- Schema quality: 100 → unverified ▼ functional
- Capabilities: pass → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- 31 Oct 26 +3
- Authorization: partial → pass ▲ security
- MCP protocol: fail → pass ▲ functional
- New prompt “check_what_is_on_your_calendar_this_week” functional
- New prompt “find_a_contact_by_email_or_phone” functional
- New prompt “read_and_summarize_recent_emails_from_a_sender” functional
- New prompt “send_an_email_or_create_a_calendar_event” functional
- New prompt “write_a_draft_email_and_leave_it_unsent” functional
- MCP protocol version: 2025-06-18 → 2025-11-25 functional
- Server version: 1.31.0 → 1.33.0 functional
- Server version: 1.30.0 → 1.31.0 functional
- Server version: 1.29.2 → 1.30.0 functional
- 30 Oct 26 0
- Server version: 1.29.1 → 1.29.2 functional
- Server version: 1.29.0 → 1.29.1 functional
- 29 Oct 26 0
- Server version: 1.28.0 → 1.29.0 functional
- Server version: 1.27.0 → 1.28.0 functional
- 28 Oct 26 0
- Server version: 1.25.0 → 1.27.0 functional
- 27 Oct 26 0
- Server version: 1.24.0 → 1.25.0 functional
- 25 Oct 26 0
- Server version: 1.23.0 → 1.24.0 functional
- Server version: 1.22.0 → 1.23.0 functional
- Server version: 1.21.3 → 1.22.0 functional
- Server version: 1.21.0 → 1.21.3 functional
- 24 Oct 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Server version: 1.20.0 → 1.21.0 functional
- Server version: 1.19.0 → 1.20.0 functional
- Server version: 1.17.0 → 1.19.0 functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://nylas.usefulapi.io/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=usefulapi.io | CN=WE1,O=Google Trust Services,C=US | 13 Sept 2026 | 12 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | d9be3287b0fde9630e825ba1f79bff3f |
| SANs: usefulapi.io, *.usefulapi.io | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of nylas.usefulapi.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | Trust anchor | 20326, 38696 | 8, 8 | Verified |
| io. | DS published | 38690 | 8 | Verified |
| usefulapi.io. | No DS | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Inconclusive
We could not reach the endpoint well enough to judge its authorisation posture.
| Result | Inconclusive |
|---|---|
| HTTP status | 302 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://nylas.usefulapi.io/mcp | Redirected | 302 | https://usefulapi.io/nylas/ |
| http (plaintext) | http://nylas.usefulapi.io/mcp | Inconclusive | 302 | http://nylas.usefulapi.io/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
nylas_create_draft Create a draft email ~133
Creates a draft email (does NOT send — safe/additive). Nylas v3: POST /v3/grants/{grant_id}/drafts.
| Name | Type | Req | Description |
|---|---|---|---|
| bcc | array | – | BCC email addresses (array of strings). |
| body | string | – | Email body (HTML or plain text). |
| cc | array | – | CC email addresses (array of strings). |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| subject | string | – | Email subject line. |
| to | array | yes | Recipient email addresses (array of strings). |
No output schema declared.
No examples provided.
nylas_create_event Create a calendar event ~166
Creates a calendar event (may send invites to participants). Requires calendar_id (sent as a query param). Nylas v3: POST /v3/grants/{grant_id}/events.
| Name | Type | Req | Description |
|---|---|---|---|
| calendar_id | string | yes | REQUIRED. The calendar id to create the event in (sent as a query param). |
| description | string | – | Event description. |
| end_time | integer | yes | Event end, Unix timestamp (seconds). |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| location | string | – | Event location. |
| participants | array | – | Participant email addresses (array of strings). |
| start_time | integer | yes | Event start, Unix timestamp (seconds). |
| title | string | yes | Event title. |
No output schema declared.
No examples provided.
nylas_get_calendar Get a calendar ~75
Get a single calendar by id. Nylas v3: GET /v3/grants/{grant_id}/calendars/{calendar_id}.
| Name | Type | Req | Description |
|---|---|---|---|
| calendar_id | string | yes | The calendar id to fetch. |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
No output schema declared.
No examples provided.
nylas_get_contact Get a contact ~73
Get a single contact by id. Nylas v3: GET /v3/grants/{grant_id}/contacts/{contact_id}.
| Name | Type | Req | Description |
|---|---|---|---|
| contact_id | string | yes | The contact id to fetch. |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
No output schema declared.
No examples provided.
nylas_get_event Get an event ~103
Get a single calendar event by id. Requires calendar_id (sent as a query param). Nylas v3: GET /v3/grants/{grant_id}/events/{event_id}.
| Name | Type | Req | Description |
|---|---|---|---|
| calendar_id | string | yes | REQUIRED. The calendar id (sent as a query param). |
| event_id | string | yes | The event id to fetch. |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
No output schema declared.
No examples provided.
nylas_get_grant Get a grant ~59
Get details for a single connected account (grant). Nylas v3: GET /v3/grants/{grant_id}.
| Name | Type | Req | Description |
|---|---|---|---|
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
No output schema declared.
No examples provided.
nylas_get_message Get a message ~74
Get a single email message by id. Nylas v3: GET /v3/grants/{grant_id}/messages/{message_id}.
| Name | Type | Req | Description |
|---|---|---|---|
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| message_id | string | yes | The message id to fetch. |
No output schema declared.
No examples provided.
nylas_list_calendars List calendars ~100
List calendars for the connected account (each has a calendar_id used by the events tools). Nylas v3: GET /v3/grants/{grant_id}/calendars.
| Name | Type | Req | Description |
|---|---|---|---|
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| limit | integer | – | Max calendars to return. |
| page_token | string | – | Pagination cursor (next_cursor from a prior page). |
No output schema declared.
No examples provided.
nylas_list_contacts List contacts ~115
List contacts for the connected account, with optional email/phone filters. Nylas v3: GET /v3/grants/{grant_id}/contacts.
| Name | Type | Req | Description |
|---|---|---|---|
| string | – | Filter by email address. | |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| limit | integer | – | Max contacts to return. |
| page_token | string | – | Pagination cursor (next_cursor from a prior page). |
| phone_number | string | – | Filter by phone number. |
No output schema declared.
No examples provided.
nylas_list_drafts List drafts ~88
List draft emails for the connected account. Nylas v3: GET /v3/grants/{grant_id}/drafts.
| Name | Type | Req | Description |
|---|---|---|---|
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| limit | integer | – | Max drafts to return. |
| page_token | string | – | Pagination cursor (next_cursor from a prior page). |
No output schema declared.
No examples provided.
nylas_list_events List events ~157
List calendar events. Requires calendar_id (sent as a query param). Nylas v3: GET /v3/grants/{grant_id}/events.
| Name | Type | Req | Description |
|---|---|---|---|
| calendar_id | string | yes | REQUIRED. The calendar id (sent as a query param). |
| end | integer | – | Filter: latest event start, Unix timestamp (seconds). |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| limit | integer | – | Max events to return. |
| page_token | string | – | Pagination cursor (next_cursor from a prior page). |
| show_cancelled | boolean | – | Include cancelled events. |
| start | integer | – | Filter: earliest event start, Unix timestamp (seconds). |
No output schema declared.
No examples provided.
nylas_list_folders List folders ~72
List mail folders/labels for the connected account. Nylas v3: GET /v3/grants/{grant_id}/folders.
| Name | Type | Req | Description |
|---|---|---|---|
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| limit | integer | – | Max folders to return. |
No output schema declared.
No examples provided.
nylas_list_grants List grants (connected accounts) ~75
List the connected accounts (grants) on this Nylas application, each with a grant_id used to scope other tools. Not grant-scoped. Nylas v3: GET /v3/grants.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max grants to return. |
| offset | integer | – | Pagination offset. |
No output schema declared.
No examples provided.
nylas_list_messages List messages ~177
List email messages for the connected account, with optional filters. Nylas v3: GET /v3/grants/{grant_id}/messages.
| Name | Type | Req | Description |
|---|---|---|---|
| from | string | – | Filter by sender email address. |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| in | string | – | Filter by folder id. |
| limit | integer | – | Max messages to return. |
| page_token | string | – | Pagination cursor (next_cursor from a prior page). |
| search_query_native | string | – | Provider-native search query string. |
| starred | boolean | – | If set, filter by starred status. |
| subject | string | – | Filter by subject. |
| to | string | – | Filter by recipient email address. |
| unread | boolean | – | If set, filter by unread status. |
No output schema declared.
No examples provided.
nylas_send_message Send an email ~155
SENDS a real email via the connected account. This dispatches an actual message. Nylas v3: POST /v3/grants/{grant_id}/messages/send.
| Name | Type | Req | Description |
|---|---|---|---|
| bcc | array | – | BCC email addresses (array of strings). |
| body | string | – | Email body (HTML or plain text). |
| cc | array | – | CC email addresses (array of strings). |
| grant_id | string | – | Connected-account grant id. Overrides NYLAS_GRANT_ID for this call. |
| reply_to_message_id | string | – | Id of the message this is a reply to. |
| subject | string | – | Email subject line. |
| to | array | yes | Recipient email addresses (array of strings). |
No output schema declared.
No examples provided.
How do I install the Nylas MCP by usefulapi server?
Nylas MCP by usefulapi is a hosted endpoint at https://nylas.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · nylas.usefulapi.io
claude mcp add --transport http io-usefulapi-nylas 'https://nylas.usefulapi.io/mcp'
What is the Nylas MCP by usefulapi server?
Nylas MCP by usefulapi is listed in the public MCP registry as io.usefulapi/nylas. MCP server for Nylas, read email, calendars, events and contacts, and send email or create events. This page covers its hosted endpoint (https://nylas.usefulapi.io/mcp).
Is the Nylas MCP by usefulapi server safe to use?
Nylas MCP by usefulapi scores 18 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Nylas MCP by usefulapi server expose?
Nylas MCP by usefulapi exposes 15 tools: nylas_list_grants, nylas_get_grant, nylas_list_messages, nylas_get_message, nylas_list_folders, and 10 more. Their descriptions and schemas cost roughly 1,622 tokens of context every time the server is loaded.
Does the Nylas MCP by usefulapi server require authentication?
Its publisher declares no required credentials for Nylas MCP by usefulapi. We have not been able to confirm that against the live endpoint, and a server can require authorisation without declaring it here.
Is the Nylas MCP by usefulapi server still maintained?
Nylas MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What did VerifyMCP test on the Nylas MCP by usefulapi server?
VerifyMCP ran 4 checks on Nylas MCP by usefulapi, covering TLS certificate, HSTS header, DNSSEC and Transport. 7 items could not be completed, a gap on our side rather than a finding about Nylas MCP by usefulapi: Authorization, HTTPS, Schema quality, Stability and 3 more. 5 categories score 0 for that reason, because we only credit what we can confirm. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.