io.usefulapi/nylas

REMOTE · NYLAS.USEFULAPI.IO · SCANNED AUG 3

MCP server for Nylas — read email, calendars, events and contacts, and send email or create events.

Available components

+4 this week 73 73 Trust /100

Trust breakdown (6 categories)

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 →

Endpoint Security78

The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token. View diagnostics → Pass
HTTPS not yet verified: we couldn't determine whether a plaintext access path exists. 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
The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents. View diagnostics → Partial

Transport & Reachability100

Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass

Schema Quality & AI Usability77

AI-judged instruction clarity (excellent).Pass
Context-footprint check failed: tool/resource definitions use about 1622 tokens (~108/item across 15 items; 15 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
Usage-examples check failed: none of the tools include examples. See how to fix → Fail

Stability & Change Management23

Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial

Tool Coverage100

100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
100% of tool parameters carry a description.Pass

Capabilities60

Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail

Install

Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.

remote · nylas.usefulapi.io

Claude Codex opencode OpenClaw Hermes Other

# add to Claude Code

claude mcp add --transport http io-usefulapi-nylas https://nylas.usefulapi.io/mcp

# ~/.codex/config.toml

[mcp_servers.io-usefulapi-nylas]
url = "https://nylas.usefulapi.io/mcp"

// opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-nylas": {
      "type": "remote",
      "url": "https://nylas.usefulapi.io/mcp",
      "enabled": true
    }
  }
}

# add to OpenClaw

openclaw mcp add io-usefulapi-nylas --url https://nylas.usefulapi.io/mcp --transport streamable-http

# ~/.hermes/config.yaml

mcp_servers:
  io-usefulapi-nylas:
    url: "https://nylas.usefulapi.io/mcp"

// mcp.json

{
  "mcpServers": {
    "io-usefulapi-nylas": {
      "type": "http",
      "url": "https://nylas.usefulapi.io/mcp"
    }
  }
}

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

Changelog

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 Aug 26 +55
- Authorization: unverified → pass ▲ security
- Transport: fail → pass ▲ security
- MCP protocol: unverified → fail ▼ functional
- Endpoint reachability: not serving MCP → reachable ▲ functional
- Stability: unverified → 0.20 ▲ functional
- Tool coverage: unverified → 100 ▲ functional
1 Aug 26 −54
- Endpoint reachability: reachable → not serving MCP ▼ security
- Stability: 0.13 → unverified ▼ security
- Authorization: pass → unverified ▼ security
- Transport: pass → fail ▼ security
- Capabilities: fail → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
31 Jul 26 +3
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
30 Jul 26 −2
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
29 Jul 26 +1

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
28 Jul 26 +1
- Stability: unverified → 0.03 ▲ functional
27 Jul 26 +57
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
26 Jul 26 12

First indexed and scored.

Show 6 earlier entries Hide earlier entries

Diagnostics

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 3 Aug 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	17 Jul 2026	15 Oct 2026	ECDSA 256	ECDSA-SHA256	aefa894c62f2b1da0ee879d2bc32fd33
SANs: usefulapi.io, nylas.usefulapi.io, *.nylas.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

DNSSEC insecure

Validation of nylas.usefulapi.io. — Not signed

Zone	DS	Keys	Algorithms	Outcome
.	trust_anchor	20326, 38696	8, 8	Verified
io.	present	57355	8	Verified
usefulapi.io.	absent			Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation

Authentication Enforced and verified

The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.

Result	Enforced and verified
Enforced	On tool calls
HTTP status	200

WWW-Authenticate challenge Bearer realm="OAuth", resource_metadata="https://nylas.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"

Bearer realm="OAuth", resource_metadata="https://nylas.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"

Protected resource metadata

Document	https://nylas.usefulapi.io/.well-known/oauth-protected-resource/mcp
Retrieved	Yes
Resource	https://nylas.usefulapi.io/mcp
Authorisation server	https://nylas.usefulapi.io

Transports 2 probes

Transport	URL	Outcome	Status	Location
streamable-http	https://nylas.usefulapi.io/mcp	Verified	200
http (plaintext)	http://nylas.usefulapi.io/mcp	Inconclusive	401

MCP tools — 15 exposed · ~1,622 tokens

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.

Tool Tokens

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.

Input Output Examples

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.

Input Output Examples

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}.

Input Output Examples

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}.

Input Output Examples

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}.

Input Output Examples

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}.

Input Output Examples

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}.

Input Output Examples

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.

Input Output Examples

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.

Input Output Examples

Name	Type	Req	Description
email	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.

Input Output Examples

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.

Input Output Examples

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.

Input Output Examples

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.

Input Output Examples

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.

Input Output Examples

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.

Input Output Examples

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.

On this page

Handy links

Scoring key

80+ high trust
60–79 medium
below 60 low

How we score

Score history · last 30 days

26 Jul 3 Aug

Day	Score
26 Jul	12
27 Jul	69
28 Jul	70
29 Jul	71
30 Jul	69
31 Jul	72
1 Aug	18
2 Aug	73
3 Aug	73