io.github.spruikco/send16-mcp

NPM · SEND16-MCP · 2 COMPONENTS · SCANNED AUG 3

Email for AI agents: send mail, manage contacts, automations & webhooks. Zero-DNS first send.

Available components

remote · mcp.send16.com 75 npm · send16-mcp 65

+19 this week 65 65 Trust /100

Trust breakdown (6 categories)

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score →

Supply Chain Security86

No malware found by supply-chain analysis.Pass
Only part of the dependency tree could be resolved (94 of 98), so this covers what we could see, not the whole tree.Partial
No install/post-install scripts declared.Pass
Only part of the dependency tree could be resolved (94 of 98), so this covers what we could see, not the whole tree. View diagnostics → Partial

Provenance & Transparency45

Source repository is publicly reachable at the declared URL. View diagnostics → Pass
Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
Clear OSI-approved license (MIT).Pass
Actively maintained (last published 2 days ago).Pass
Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail

Schema Quality & AI Usability77

AI-judged instruction clarity (excellent).Pass
Tool/resource definitions use about 6299 tokens (~79/item across 79 items; 79 tools + 0 resources), lean.Pass
Usage-examples check failed: none of the tools include examples. See how to fix → Fail

Stability & Change Management0

Stability not yet verified: not enough scan history yet (needs a 30-day window).Unverified

Tool Coverage95

100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
84% of tool parameters carry a description.Partial

Capabilities100

Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass

Unverified: 1 category

A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

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.

npm · send16-mcp

Claude Codex opencode OpenClaw Hermes Other

# add to Claude Code

claude mcp add spruikco-send16-mcp -- npx -y send16-mcp

# add to Codex CLI

codex mcp add spruikco-send16-mcp -- npx -y send16-mcp

// opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "spruikco-send16-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "send16-mcp"
      ],
      "enabled": true
    }
  }
}

# add to OpenClaw

openclaw mcp add spruikco-send16-mcp --command npx --arg -y --arg send16-mcp

# ~/.hermes/config.yaml

mcp_servers:
  spruikco-send16-mcp:
    command: "npx"
    args: ["-y", "send16-mcp"]

// mcp.json

{
  "mcpServers": {
    "spruikco-send16-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "send16-mcp"
      ]
    }
  }
}

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 +12
- Malware scan: unverified → pass ▲ security
1 Aug 26 +32
- Provenance: unverified → fail ▼ security
- Known CVEs: unverified → partial ▲ security
- Install scripts: unverified → pass ▲ security
- Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window). security
- Maintenance: unverified → pass ▲ functional
- Dependency health: unverified → partial ▲ functional
- License: unverified → pass ▲ functional
- MCP protocol: unverified → pass ▲ functional
- Schema quality: unverified → excellent ▲ functional
- Licence: MIT functional
31 Jul 26 −7
- 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 −18
- Malware scan: pass → unverified ▼ security
27 Jul 26 46

First indexed and scored.

Show 2 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 · Analysed npm/[email protected]

Provenance none

Ecosystem: npm · Outcome: none

Dependencies 94 packages

94 packages in the resolved dependency tree · 94 deprecated · 29 stale.

The dependency tree was only partially resolved, so these counts may be incomplete.

MCP tools — 79 exposed · ~6,299 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

list_topics ~70

List subscription topics. Topics are granular categories contacts can subscribe to (e.g. 'product-updates', 'weekly-digest'). Campaigns and automations can be gated to subscribers of a specific topic.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)

No output schema declared.

No examples provided.

list_webhooks ~56

List configured outgoing webhooks (your endpoints that Send16 POSTs delivery events to). Outgoing webhooks are a plan feature.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)

No output schema declared.

No examples provided.

list_workspaces ~44

List workspaces the authenticated user has access to (owner or member).

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)

No output schema declared.

No examples provided.

mark_convo_read ~51

Mark a conversation as read for the current viewer.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
convoId	string	yes	Conversation ID

No output schema declared.

No examples provided.

pause_automation ~56

Pause an automation. Existing enrollments freeze in place; no new contacts enroll.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
automationId	string	yes	Automation ID

No output schema declared.

No examples provided.

pause_campaign ~55

Pause a sending campaign. Already-sent messages are unaffected; remaining sends halt.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
campaignId	string	yes	Campaign ID

No output schema declared.

No examples provided.

pre_send_review ~101

Run an AI pre-send review on an email's HTML before sending. Surfaces tone issues, broken links, missing alt text, spam triggers, and accessibility problems.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
audience	string	—	Short description of the audience (helps tone analysis)
html	string	yes	Full HTML body to review
subject	string	yes	Email subject line

No output schema declared.

No examples provided.

preview_campaign_recipients ~58

Preview the recipient set for a campaign before sending. Returns count + sample list.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
campaignId	string	yes	Campaign ID

No output schema declared.

No examples provided.

preview_segment ~49

Preview the contacts that match a segment without sending.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
segmentId	string	yes	Segment ID

No output schema declared.

No examples provided.

regenerate_webhook_secret ~60

Rotate the HMAC signing secret for an outgoing webhook endpoint. Returns the new secret once.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
webhookId	string	yes	Webhook ID

No output schema declared.

No examples provided.

remove_contact_from_audience ~59

Remove a contact from an audience.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
audienceId	string	yes	Audience ID
contactId	string	yes	Contact ID

No output schema declared.

No examples provided.

remove_suppression ~59

Remove an email from the suppression list. Use only when you've confirmed the recipient wants to receive mail again.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
email	string	yes	—

No output schema declared.

No examples provided.

render_email_content ~108

Compile an EmailContent JSON object (the shape used by the Send16 builder + templates) into HTML using the platform's authoritative renderer. Returns the exact HTML the API would send. Useful for previews and post-processing.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
content	object	yes	EmailContent JSON (from get_template or the builder)
variables	object	—	Variable replacements (e.g. {firstName:'Alice'})

No output schema declared.

No examples provided.

resume_campaign ~44

Resume a paused campaign.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
campaignId	string	yes	Campaign ID

No output schema declared.

No examples provided.

schedule_campaign ~99

Schedule (or send immediately) an existing draft campaign to an audience/segment/topic.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
audienceId	string	—	—
campaignId	string	yes	Campaign ID
scheduleAt	string	—	ISO-8601 future datetime; omit to send immediately
segmentId	string	—	—
topicId	string	—	—

No output schema declared.

No examples provided.

screener_decide ~83

Decide a pending screener conversation (first-time sender). 'allow' lets future emails through, 'reject' blocks, 'cold' marks as cold outreach.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
convoId	string	yes	Conversation ID
decision	string	yes	Screener decision

No output schema declared.

No examples provided.

search_contacts ~90

Search contacts by email address or name. Returns matching contacts with their tags and subscription status.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
page	integer	—	Page number
pageSize	integer	—	Results per page (max 100)
query	string	yes	Search query (matches against email, first name, last name)

No output schema declared.

No examples provided.

send_broadcast ~224

One-shot broadcast: create a campaign and immediately schedule it to send. Mirrors Resend's one-call broadcast API. Pass either an audienceId, segmentId, topicId, or fully-qualified filter. Provide html OR templateSlug.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
audienceId	string	—	Send to all contacts in this audience
fromEmail	string	yes	Must be a verified domain
fromName	string	yes	—
html	string	—	Full HTML body (one of html/templateSlug required)
name	string	yes	Internal campaign name
previewText	string	—	—
replyTo	string	—	—
scheduleAt	string	—	ISO-8601 future datetime; omit to send immediately
segmentId	string	—	Send to all contacts matching this segment
subject	string	yes	—
templateSlug	string	—	Workspace template slug to use
topicId	string	—	Send to all subscribers of this topic

No output schema declared.

No examples provided.

send_campaign_test ~79

Send a test email for an existing campaign to preview how it will look in recipients' inboxes.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
campaignId	string	yes	Campaign ID to send test for
testEmail	string	yes	Email address to send the test to

No output schema declared.

No examples provided.

send_email ~275

Send a transactional email through Send16. Provide `html`, `text`, or both (text-only is fine for OTPs/receipts/alerts). `from_email` must belong to a domain that is verified in the workspace — call `whoami` for the account and `list_domains` to see which senders are allowed; a send from an unverified domain returns a clear error, not a silent failure. For a zero-setup first send, use from_email `[email protected]` — the sandbox sender delivers with no DNS, but only to your own account email.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
from_email	string	—	Sender email address (must be from a verified domain)
from_name	string	—	Sender display name (e.g. "Acme Co")
html	string	—	HTML body content
reply_to	string	—	Reply-to email address
subject	string	yes	Email subject line
template	string	—	Transactional template slug to use instead of inline content
text	string	—	Plain text body content
to	—	yes	Recipient email address or array of addresses (max 50)
variables	object	—	Template variables for merge tags

No output schema declared.

No examples provided.

send_event ~163

Fire a custom event for a contact. Automations whose trigger is `{type:'custom_event', eventName:'<name>'}` will enroll the contact and start running. Payload is exposed to condition steps as `event.<key>`.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
contactEmail	string	—	Contact email (provide either this or contactId)
contactId	string	—	Contact UUID (provide either this or contactEmail)
name	string	yes	Event name (e.g. 'trial_started', 'order.placed')
occurredAt	string	—	ISO-8601 timestamp; defaults to now
payload	object	—	Arbitrary JSON metadata available to automation conditions

No output schema declared.

No examples provided.

send_reply ~94

Reply to an inbox conversation. The reply is sent from the original recipient address (the alias the convo arrived on) and threaded back to the contact.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
convoId	string	yes	Conversation ID
html	string	—	HTML body of the reply
text	string	—	Plain text body of the reply

No output schema declared.

No examples provided.

update_action ~99

Update an Action (toggle enabled, change template, change event name).

Input Output Examples

Name	Type	Req	Description
actionId	string	yes	Action ID
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
delaySeconds	integer	—	—
enabled	boolean	—	—
eventName	string	—	—
name	string	—	—
sendOnce	boolean	—	—
templateSlug	string	—	—

No output schema declared.

No examples provided.

update_brand ~128

Update workspace brand settings. The designSpec field is a Markdown DESIGN.md document fed into AI generation system prompts — use it to encode voice, do/don't lists, and visual rules.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
designSpec	string	—	Markdown DESIGN.md spec for AI generation
fontFamily	string	—	—
logoUrl	string	—	—
primaryColor	string	—	Hex color (e.g. '#4F46E5')
secondaryColor	string	—	Hex color

No output schema declared.

No examples provided.

update_campaign ~109

Update a draft campaign's content, subject, preview text, or sender info.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
campaignId	string	yes	Campaign ID
fromEmail	string	—	—
fromName	string	—	—
html	string	—	—
previewText	string	—	—
replyTo	string	—	—
subject	string	—	—
templateSlug	string	—	—

No output schema declared.

No examples provided.

update_contact ~84

Update a contact's profile fields, custom fields, or subscription state.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
contactId	string	yes	Contact ID
customFields	object	—	—
firstName	string	—	—
lastName	string	—	—
subscribed	boolean	—	—

No output schema declared.

No examples provided.

update_convo ~97

Update conversation state (open/closed/snoozed/spam/trash), star, or assignee.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
assigneeId	—	—	Workspace member ID, or null to unassign
convoId	string	yes	Conversation ID
starred	boolean	—	Star/unstar
state	string	—	New state

No output schema declared.

No examples provided.

update_topic ~72

Update a subscription topic (name, description, default).

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)
description	string	—	—
isDefault	boolean	—	—
name	string	—	—
topicId	string	yes	Topic ID

No output schema declared.

No examples provided.

whoami ~78

Verify the API key and return the authenticated workspace: name, plan, email quota (used/limit), and owner. Call this first to confirm the key works before sending. Pair with list_domains to see which `from` addresses are allowed.

Input Output Examples

Name	Type	Req	Description
apiKey	string	—	Send16 API key (overrides SEND16_API_KEY env var)

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

27 Jul 3 Aug