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Moltline Outbound Engine

REMOTE · MCP.MOLTLINESTUDIO.COM · SCANNED SEP 20

7 outreach, sequencing, call-coaching and CRM-hygiene skill products. 6 of 8 free.

+1 this week 87 Trust /100
Trust breakdown (7 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 → Why this is hard to score →

Endpoint Security83
Transport & Reachability100
Schema Quality & AI Usability67
  • AI-judged instruction clarity (excellent).Pass
  • Context-footprint check failed: tool/resource definitions use about 1960 tokens (~245/item across 8 items; 8 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 Management100
  • No destabilizing schema changes in the last 30 days.Pass
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
  • Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
  • An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Install

How do I install the Moltline Outbound Engine MCP server?

Moltline Outbound Engine is a hosted endpoint at https://mcp.moltlinestudio.com/outbound, 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 · mcp.moltlinestudio.com

# add to Claude Code
claude mcp add --transport http com-moltlinestudio-outbound 'https://mcp.moltlinestudio.com/outbound'
// .cursor/mcp.json
{
  "mcpServers": {
    "com-moltlinestudio-outbound": {
      "url": "https://mcp.moltlinestudio.com/outbound"
    }
  }
}
// .vscode/mcp.json
{
  "servers": {
    "com-moltlinestudio-outbound": {
      "type": "http",
      "url": "https://mcp.moltlinestudio.com/outbound"
    }
  }
}
# ~/.codex/config.toml
[mcp_servers.com-moltlinestudio-outbound]
url = "https://mcp.moltlinestudio.com/outbound"
// opencode.json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-moltlinestudio-outbound": {
      "type": "remote",
      "url": "https://mcp.moltlinestudio.com/outbound",
      "enabled": true
    }
  }
}
# add to OpenClaw
openclaw mcp add com-moltlinestudio-outbound --url 'https://mcp.moltlinestudio.com/outbound' --transport streamable-http
# ~/.hermes/config.yaml
mcp_servers:
  com-moltlinestudio-outbound:
    url: "https://mcp.moltlinestudio.com/outbound"
// ~/.netclaw/config/netclaw.json
{
  "McpServers": {
    "com-moltlinestudio-outbound": {
      "Transport": "http",
      "Url": "https://mcp.moltlinestudio.com/outbound"
    }
  }
}
# add to Vellum
assistant mcp add com-moltlinestudio-outbound -t streamable-http -u 'https://mcp.moltlinestudio.com/outbound'
// mcp.json
{
  "mcpServers": {
    "com-moltlinestudio-outbound": {
      "type": "http",
      "url": "https://mcp.moltlinestudio.com/outbound"
    }
  }
}

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.

  • 16 Sept 26 0
    • Stability: 0.97 → pass security
  • 15 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

  • 13 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

  • 11 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.

  • 9 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

  • 6 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

  • 4 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

  • 2 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

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 20 Sept 2026 · Probed https://mcp.moltlinestudio.com/outbound

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject Issuer Valid from Valid until Key Signature Serial
CN=moltlinestudio.com CN=WE1,O=Google Trust Services,C=US 15 Aug 2026 13 Nov 2026 ECDSA 256 ECDSA-SHA256 72e09c6114448e7a0ed370fb03c277cb
SANs: moltlinestudio.com, *.moltlinestudio.com
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 secure

Validation of mcp.moltlinestudio.com. Secure

Zone DS Keys Algorithms Outcome
. trust_anchor 20326, 38696 8, 8 Verified
com. present 19718 13 Verified
moltlinestudio.com. present 2371 13 Verified
mcp.moltlinestudio.com. Verified address RRset verified with the apex keys
Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result No authorisation required
HTTP status 200
Header Value
strict-transport-security max-age=15576000; includeSubDomains
content-security-policy default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self' data:; connect-src 'self' https://api.moltlinestudio.com https://mcp.moltlinestudio.com; form-action 'self'; frame-ancestors 'none'; base-uri 'self'; object-src 'none'; upgrade-insecure-requests
x-content-type-options nosniff
x-frame-options DENY
referrer-policy strict-origin-when-cross-origin
permissions-policy camera=(), microphone=(), geolocation=()

Background: How OAuth 2.1 works in the 2026 MCP spec →

Transports 2 probes
Transport URL Outcome Status Location
streamable-http https://mcp.moltlinestudio.com/outbound Verified 200
http (plaintext) http://mcp.moltlinestudio.com/outbound HTTPS enforced 301 https://mcp.moltlinestudio.com/outbound
MCP tools · 8 exposed · ~1,894 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. 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 →

Tool Tokens
audit_copy ~222

Audit outreach copy for spam triggers and deliverability risks. FREE. Checks spam-trigger phrases, length, structure, caps, links, and personalization signals. Typical input {"subject": "Quick question", "body": "<email text>"} returns {"score": 0-100, "findings": ["Spam-trigger phrases: ...", "Long for cold outreach (200 words; aim 50-125)"], "note": "..."}. Use on the body of an outreach message. Not for the subject line alone (subject_line_scorer) and not for the send schedule (sequence_planner). Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"}. Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

NameTypeReqDescription
bodystringThe email body text to audit.
subjectstringThe email subject line; may be empty when auditing body copy alone.

Structured output declared, but exposes no named fields.

No examples provided.

get_free_skill ~216

Load a product's free gateway skill with its complete instructions. FREE. Typical input {"slug": "linkedin-outreach"} returns {"slug": ..., "skill": "<skill name>", "instructions": "<full skill text>"}. Returns exactly one skill - the product's free gateway skill - chosen automatically from the slug, with no plan required. Use when the caller wants usable instructions immediately. Not for the product's other skills: those are named and need get_full_skill with a skill_name, which requires a paid plan. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "unknown slug '<value>'. Use list_products."}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

NameTypeReqDescription
slugstringyesProduct slug exactly as returned by list_products, e.g. "linkedin-outreach".

Structured output declared, but exposes no named fields.

No examples provided.

get_full_product ~218

Load one product in full: its persona plus every paid skill. PREMIUM (license). Typical input {"slug": "linkedin-outreach"} returns {"slug": ..., "name": ..., "persona": "<persona text>", "skills": [{"name": ..., "instructions": ...}, ...], "free_skill": {...}}. Returns persona plus every skill for one product. Use when the caller wants the whole product. Not for a single skill (get_full_skill) and not for a free look, which list_products and get_free_skill provide with no plan. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "unknown slug '<value>'"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

NameTypeReqDescription
slugstringyesProduct slug exactly as returned by list_products, e.g. "linkedin-outreach".

Structured output declared, but exposes no named fields.

No examples provided.

get_full_skill ~223

Load one paid skill's complete instructions from a product. PREMIUM (license). Typical input {"slug": "linkedin-outreach", "skill_name": "Connection Openers"} returns {"slug": ..., "skill": ..., "instructions": "<full skill text>"}. Returns one named skill, selected by skill_name. Use when the caller wants one specific paid skill. Not for the free gateway skill, which get_free_skill returns with no plan, and not for every skill at once (get_full_product). Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "unknown slug '<value>'"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

NameTypeReqDescription
skill_namestringyesExact skill name as listed in that product's "skills" array from list_products.
slugstringyesProduct slug exactly as returned by list_products.

Structured output declared, but exposes no named fields.

No examples provided.

list_products ~209

List the 7 outbound products with their included skills. FREE. Takes no arguments. Returns a list of product objects, each {"slug": "linkedin-outreach", "name": ..., "tagline": ..., "skills": ["Skill A", ...], "free_skill": "Gateway Skill Name"}. Use the returned slug values with get_free_skill, get_full_product, or get_full_skill. Returns metadata only - no persona text and no skill instructions. Use when the caller wants to see what this server covers. Not for keyword search across the whole 138-product catalog, which the catalog server's search_catalog does, and not for instructions the caller can act on (get_free_skill). Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"}. Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

Input schema present but exposes no named parameters.

NameTypeReqDescription
resultarrayyes

No examples provided.

sequence_planner ~280

Plan an outreach cadence with expanding gaps and per-touch purposes. FREE. Spaces N touches across D days, alternating channels. Typical input {"touches": 5, "days": 14, "channels": ["email", "linkedin"]} returns {"days": 14, "plan": [{"touch": 1, "day": 0, "channel": "email", "purpose": "open with a specific, researched reason"}, ...], "rule": "..."}. Use when cadence and per-touch purpose are the question. Not for the wording of any single message (audit_copy). Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"}. Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

NameTypeReqDescription
channelsarrayChannel names to alternate through in order, e.g. ["email", "linkedin", "phone"]. Default ["email", "linkedin"].
daysintegerTotal span of the sequence in days; values outside 1-365 are clamped. Default 14.
touchesintegerNumber of touches in the sequence; values outside 2-10 are clamped. Default 5.

Structured output declared, but exposes no named fields.

No examples provided.

subject_line_scorer ~221

Score and rank up to 20 email subject lines, best first. FREE. Scores 0-100 on length, spam triggers, caps, personalization merge fields, and curiosity cues. Typical input {"subjects": ["Quick question about {{company}}", "ACT NOW!!!"]} returns {"ranked": [{"subject": ..., "score": 92, "notes": ["personalized (+)", "question format"]}, ...]}. Use when several subject lines need ranking against deliverability and curiosity signals. Not for article headlines, which the creator server's headline_analyzer ranks, and not for message bodies (audit_copy). Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"}. Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

NameTypeReqDescription
subjectsarrayyesList of candidate subject lines as plain strings; only the first 20 are scored.

Structured output declared, but exposes no named fields.

No examples provided.

utm_builder ~305

Build a UTM-tagged URL for campaign tracking. FREE. Typical input {"url": "https://example.com/pricing", "source": "newsletter", "medium": "email", "campaign": "spring-launch"} returns {"tagged_url": "https://example.com/pricing?utm_source=newsletter& utm_medium=email&utm_campaign=spring-launch"}. Use to build one tagged tracking URL. Not for analyzing campaign results and not for anything that belongs in the message body (audit_copy). Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "url must start with http(s)://"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

NameTypeReqDescription
campaignstringyesutm_campaign value — the campaign name, e.g. "spring-launch".
contentstringOptional utm_content value for A/B variants.
mediumstringyesutm_medium value — the channel, e.g. "email" or "cpc".
sourcestringyesutm_source value — where the traffic comes from, e.g. "newsletter".
termstringOptional utm_term value for paid keywords.
urlstringyesDestination URL; must start with http:// or https://.

Structured output declared, but exposes no named fields.

No examples provided.

Common questions

What is the Moltline Outbound Engine MCP server?

Moltline Outbound Engine is an MCP server listed in the public MCP registry as com.moltlinestudio/outbound. 7 outreach, sequencing, call-coaching and CRM-hygiene skill products. 6 of 8 free. This page covers its hosted endpoint (https://mcp.moltlinestudio.com/outbound).

Is the Moltline Outbound Engine MCP server safe to use?

Moltline Outbound Engine scores 87 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 Moltline Outbound Engine MCP server expose?

Moltline Outbound Engine exposes 8 tools: list_products, get_free_skill, audit_copy, get_full_product, get_full_skill, and 3 more. Their descriptions and schemas cost roughly 1,894 tokens of context every time the server is loaded.

Does the Moltline Outbound Engine MCP server require authentication?

No. We connected to Moltline Outbound Engine without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

Is the Moltline Outbound Engine MCP server still maintained?

Moltline Outbound Engine is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.