MCP servers › com.warminboxes › deliverability-tools
MCP server · registry snapshot 2026-10-23 · last tested 2026-10-23
com.warminboxes/deliverability-tools
Free cold email deliverability checks, list tools, inbox planning and original placement research. — the publisher's description
Summary
com.warminboxes/deliverability-tools is a remote MCP server listed in the official MCP registry at version 1.0.0. On 2026-10-23 ProtocolProbe connected to it in read-only mode and read its inventory: 51 tools, 0 resources and 0 prompts.
Record checks
1 of 2 record checks met · 7 do not apply
- met: Registry entry is active and says how to run it
- not met: Source repository link opens
- not applicable: Repository is not archived
- not applicable: Code pushed to the repository in the 90 days before our check
- not applicable: Repository publishes a security policy (SECURITY.md)
- not applicable: Package names its licence with a standard (SPDX) identifier
- not applicable: The version the registry lists can be installed and is not withdrawn
- not applicable: npm package carries build provenance (attestation)
- not applicable: No known critical or high advisory in the package or its dependencies
- Not ranked by downloads: a remote server publishes no download figure
- Not ranked by stars: no public GitHub repository
From public records, not a safety rating. Each check with its reason
Key facts
- Runs
- remote (hosted by the publisher)
- Transport
- streamable HTTP
- Sign-in
- none needed to open a session
- Tools
- 51
- Described as changing data
- 0 of 51 toolsAI-classified
- Mainly works on
- nothing outside itself: it only answers questionsAI-classified
- Topic
- commerce-and-marketingAI-classified
- Last tested
- 2026-10-23
How fresh this is
- Live-tested
- yes, a real session (not a text-only review)
- Last tested
- 2026-10-23
- Mode
- read-only (no tool calls)
- Latest version
- 1.0.0, published 2026-10-22 (registry, as of the 2026-10-23 snapshot)
- First listed version
- 2026-10-22 (earliest version still in the registry; older removed versions would be earlier)
- Registry data
- snapshot 2026-10-23
- Package and repository
- checked 2026-10-23
- Engine
- mcp-runtime-engine@0.1.0 · sdk@1.32.0
Changes since the last refresh
New in the registry: not in the list of 2026-10-04, listed on 2026-10-23 with version 1.0.0 (published 2026-10-22).
Source: the official MCP Registry list on 2026-10-04 and on 2026-10-23.
What it is
What does this server offer?
Observed inventoryWhat it mainly works on, as our AI model read its tool descriptions: nothing outside itself: it only answers questions.
None of its 51 tools are described as changing anything. For 11 the reading was uncertain, so no mark is shown.
“Grade a domain A-F for cold email readiness.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to grade, e.g.”
“Look up a domain's SPF record and validate it, including the recursive DNS lookup count that silently breaks SPF past 10.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to check, e.g.”
“Find and validate a domain's DKIM signing key, including key strength.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
2 inputs, 1 required
domainstringrequired“Domain to check, e.g.”selectorstring“Optional DKIM selector.”
“Look up and parse a domain's DMARC record: policy, subdomain policy, percentage, alignment and reporting tags, each explained.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to check, e.g.”
“Validate a domain's BIMI record, the logo SVG, the VMC, and the DMARC enforcement level Gmail requires before it will show a brand logo.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to check, e.g.”
“Validate a domain's _mta-sts DNS record and its published policy file: mode, MX patterns, max_age and TLS-RPT.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to check, e.g.”
“Read a host's TLS certificate: issuer, validity dates and days remaining, subject alternative names, key type and size, signature algorithm, chain, negotiated protocol and whether the chain is truste…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
2 inputs, 1 required
domainstringrequired“Hostname to read a certificate from, e.g.”portnumber“TCP port.”
“Query any DNS record type for a domain: MX, TXT, A, AAAA, CNAME, NS, SOA, CAA.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
2 inputs, 1 required
domainstringrequired“Domain to query, e.g.”typestring“Record type, e.g.”
- lookup_txtreads or searches
“Every TXT record on a domain, with each one identified (SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, or which service's ownership token it is), plus the four underscore names a receiver reads — _dmarc, …”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to read TXT records from, e.g.”
- check_rdnsreads or searches
“The PTR record for an IPv4 or IPv6 address, and the forward lookup that decides whether it counts.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
ipstringrequired“An IPv4 or IPv6 address, e.g.”
“Check a domain or IP against 20+ major email blacklists (Spamhaus, Barracuda, SORBS and others) and report which list it appears on.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
inputstringrequired“A domain or an IPv4 address.”
- check_surblreads or searches
“Check domains against the SURBL URI blacklist in bulk.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainsarrayrequired“Domains to check.”
Show 39 more tools
“Get the NS records and the DNS provider behind one domain or a whole list.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainsarrayrequired“Domains to look up.”
“Get a domain's registrar, creation date, expiry date and days remaining, over RDAP with a WHOIS fallback for ccTLDs that publish no RDAP service.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to look up, e.g.”
- check_google_domainreads or searches
“Tell whether a domain is already attached to a Google Workspace account, or is clear for a fresh Google tenant.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain to check, e.g.”
- check_cnamereads or searches
“Follow a host's full CNAME chain and flag the mistakes that break a cold-email tracking domain.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
2 inputs, 1 required
hoststringrequired“Hostname to follow, e.g.”expectedstring“Optional target the chain should resolve to.”
“Check email addresses for syntax, live MX records, disposable providers and role prefixes (info@, sales@).”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
emailsarrayrequired“Email addresses to verify.”
“Look up a domain's MX records with priorities and resolved IPs, and identify the mailbox provider (Google Workspace, Microsoft 365, Zoho, Fastmail and others) and any security gateway in front of it …”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
2 inputs
domainstring“A single domain, e.g.”domainsarray“Up to 100 domains, instead of `domain`.”
- segment_espreads or searches
“Split a list of domains by the email provider behind them (Google, Microsoft, or a security gateway) from their MX records.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainsarrayrequired“Domains to segment.”
- plan_from_listreads or searches
“Estimates a sending fleet for a recipient list.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
6 inputs, 2 required
domainsarrayrequired“Up to 100 recipient domains or email addresses.”emailsPerDaynumberrequired“Target cold emails per day across the whole list, e.g.”prewarmedboolean“true for prewarmed inboxes (sending within 48–72 hours of delivery), false for fresh (21-day warmup, cheaper).”microsoftEspstring“Which pool carries the Microsoft recipients.”billingstring“Prewarmed commitment length.”rotationboolean“Rest half the fleet at any moment, which doubles the inboxes bought.”
- plan_infrastructurereads or searches
“Estimates how many inboxes and domains a daily cold email volume needs and the monthly cost at WarmInboxes' published prices.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
11 inputs, 1 required
emailsPerDaynumberrequired“Target cold emails per day, e.g.”espstring“Sending platform.”prewarmedboolean“true for prewarmed inboxes (ready to send on delivery), false for fresh (14-21 day warmup, about a third the price).”billingstring“Prewarmed commitment length.”emailsPerMailboxnumber“Daily sends per inbox.”mailboxesPerDomainnumber“Fresh Google and Microsoft only.”inboxesPerTenantnumber“Fresh Azure only: how densely a tenant is packed.”rotationboolean“Rest half the fleet at any moment, which doubles the inboxes bought.”dealValuenumber“Average deal size.”closeRatenumber“Percent of positive replies that close.”positiveRatenumber“Percent of sends that reply positively.”
- quote_inboxesreads or searches
“Prices a given number of inboxes at WarmInboxes' published prices: the domains (or Azure tenants) they sit on, daily sending capacity at the provider's pace, monthly cost and delivery time.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
4 inputs, 1 required
inboxesnumberrequired“How many inboxes, 1 to 20,000.”providerstring“Google Workspace, Microsoft 365, or Azure (Microsoft tenants).”prewarmedboolean“true for prewarmed inboxes, false for fresh (14-21 day warmup, cheaper).”billingstring“Prewarmed commitment length.”
- expand_spintaxcalculates or converts
“Expand a spintax template such as "{Hi|Hey} there" and render its Liquid merge tags, returning the total number of variations, every variable the template references, any variable with no value and n…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs, 1 required
templatestringrequired“The template, with {spin|groups} and {{merge_tags}}.”varsobject“Values for the merge tags, e.g.”samplesnumber“How many variations to render, 1 to 25.”
- generate_unsubscribegenerates content
“Build a CAN-SPAM and GDPR compliant opt-out footer in plain text and HTML, with a checklist saying which compliance requirements the details given actually satisfy.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
5 inputs
companystring“Sender name, as it should appear.”addressstring“Physical postal address.”unsubUrlstring“Unsubscribe link, for the link and both styles.”stylestring“How someone opts out.”tonestring“Defaults to casual.”
“SPF, DKIM, DMARC, MX, BIMI and MTA-STS for one domain in one call, each judged pass, weak, fail or not set, with the essentials separated from the optional records.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain, e.g.”
- check_domain_reputationreads or searches
“For "this domain used to land and now it does not".”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
1 input, 1 required
domainstringrequired“Domain, e.g.”
- check_tracking_domainreads or searches
“Check the domain a campaign's tracked links point at: whether it resolves, serves a valid certificate, is listed on SURBL, sits on a listed address, belongs under the sending domain, and whether it i…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
2 inputs, 1 required
hoststringrequired“The tracking domain, e.g.”sendingDomainstring“Optional: the domain the mail is sent from, to check the tracker sits under it.”
- check_bulk_sender_requirementsreads or searches
“The bulk sender requirements, sorted honestly: SPF, DKIM, DMARC and MX checked from DNS; forward and reverse DNS when given the sending IP; one-click unsubscribe and From alignment when given a recei…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
3 inputs, 1 required
domainstringrequired“Sending domain, e.g.”ipstring“Optional: the sending IP, only if they run their own mail server.”headersstring“Optional: raw headers of a message they sent, as received, to check one-click unsubscribe and alignment.”
“Read a received message's raw headers.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
1 input, 1 required
headersstringrequired“The raw header block of a received message (Gmail: ⋮ → Show original).”
- analyze_email_htmlreads or searches
“Read an email's HTML.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world yes
2 inputs, 1 required
htmlstringrequired“The full HTML of the email.”scanboolean“Check the linked domains against SURBL.”
- analyze_dmarc_reportreads or searches
“Read DMARC aggregate (rua) reports and say who is sending as the domain and what fails: messages passing and failing, failures that are alignment only, quarantined and rejected counts, and each sendi…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
2 inputs
xmlstring“The report XML.”gzipBase64string“A gzipped report (.xml.gz), base64-encoded.”
- analyze_cold_emailcalculates or converts
“Score a cold email's copy 0-100 for spam risk before it is sent: weighted trigger words by category and severity (subject hits weigh extra), ALL-CAPS, links and shorteners, currency and percent-off o…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
2 inputs, 1 required
subjectstring“The subject line.”bodystringrequired“The email body as plain text, merge tags included.”
- audit_campaign
“Audit a cold email campaign before launch: the lead CSV and the sequence checked together for merge tags with no column or empty values, variable syntax the sequencer will not parse, role and disposa…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
7 inputs, 2 required
csvstringrequired“The lead CSV as text, header row first.”sequencestringrequired“Every step of the sequence, merge tags as written, e.g.”inboxesnumber“Sending inboxes.”perInboxnumber“Sends per inbox per day.”daysPerWeeknumber“Sending days a week.”stepGapDaysnumber“Days between steps.”maxPerCompanynumber“Contacts allowed per company domain.”
- analyze_bouncesreads or searches
“Classify bounce messages (NDRs): invalid address, full or disabled mailbox, reputation block, authentication failure, throttling, content block or configuration, each with whether it is hard, soft or…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
1 input, 1 required
bouncesstringrequired“One or more bounce messages as pasted text, separated by a blank line or ---.”
- analyze_microsoft_headersreads or searches
“Read the spam verdict Microsoft 365 or Outlook stamped on a delivered message: SCL (spam confidence), BCL (bulk), PCL, SFV, the category, and the SPF, DKIM, DMARC and composite authentication results…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
1 input, 1 required
headersstringrequired“The full raw headers of a message delivered to a Microsoft mailbox.”
- preview_inbox
“Show how a cold email's sender name, subject line and preview text are cut off in Gmail desktop, Gmail mobile and Outlook, with warnings (no sender name, all caps, empty preview, etc.).”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs, 1 required
subjectstringrequired“The subject line.”fromNamestring“The sender name as recipients see it.”bodystring“The email body; its first text becomes the preview snippet.”
“Write an SPF record from the providers that send for a domain (with an estimate of its DNS lookups against the limit of 10), a DMARC record from a policy, and where a provider publishes DKIM.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
9 inputs
spfProvidersarray“Providers that send for the domain, e.g.”spfIncludesarray“Extra SPF include domains, e.g.”spfMxboolean“Add the mx mechanism.”spfAllstring“Policy for unlisted senders.”dmarcPolicystring“Ask for a DMARC record with this policy.”dmarcRuastring“Address for aggregate reports, e.g.”dmarcPctstring“Percentage the policy applies to.”dmarcSubdomainPolicystring“Subdomain policy, if different.”dkimProviderstring“A provider to get DKIM setup steps for, e.g.”
- plan_rotation
“Suggests a two-batch inbox rotation schedule: the fleet split in half, one batch sending while the other rests, swapped every 1, 2 or 4 weeks.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs, 2 required
sendsPerDaynumberrequired“Cold emails sent per day.”inboxesnumberrequired“Inboxes in the fleet.”cadenceWeeksnumber“Weeks between swaps.”
- plan_verification_waterfall
“Price an email verification waterfall: the list run through verifiers in sequence with unknowns passed down the chain, every order compared, cheapest cost per usable email first.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
2 inputs, 1 required
listSizenumberrequired“Emails on the list.”verifiersarray“Optional: up to 5 verifiers with pricePer1k (USD), resolvePct (share given a definite answer) and validOfResolvedPct (share of those that are valid).”
“Clean a lead CSV: malformed, duplicate, role-based (info@, sales@) and disposable addresses removed, with a count for each reason.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs, 1 required
csvstringrequired“The lead CSV as text, header row first, with an email column.”removeRoleboolean“Remove role addresses.”removeDisposableboolean“Remove disposable-domain addresses.”
- convert_csv
“Rename a lead CSV's columns to the fields a sequencer imports (Instantly, Smartlead, EmailBison, or generic snake_case).”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
2 inputs, 2 required
csvstringrequired“The lead CSV as text, header row first.”platformstringrequired“The sequencer to import into.”
- combine_csvs
“Merge several lead CSVs into one, matching columns that mean the same thing (Email, email_address, E-mail), optionally removing duplicate emails and adding a column for the file each row came from.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs, 1 required
filesarrayrequired“2 to 20 files, each { name, csv }.”dedupeboolean“Remove duplicate emails.”addSourceboolean“Add a source-file column.”
- check_suppression
“Check a campaign list against a do-not-contact list before sending: exact email matches and, optionally, whole suppressed domains, with a per-company cap.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
5 inputs, 1 required
csvstringrequired“The campaign CSV as text, header row first.”suppressionstring“Addresses and domains not to contact, one per line.”suppressionCsvstring“Or the do-not-contact list as a CSV.”matchDomainsboolean“A suppressed domain removes everyone at it.”maxPerCompanynumber“Cap contacts per company domain; 0 for no cap.”
- spamhaus_dbl_guidance
“Explains how to check a domain on the Spamhaus Domain Block List by hand at https://check.spamhaus.org.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
1 input
domainstring“The domain asked about.”
- burned_inbox_guidance
“Directs the person to the external Burned Inbox Checker at https://burnedinbox.com.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
1 input
domainstring“The domain or inbox asked about.”
- cold_email_writing_resources
“Directs the person to Cold Email AI, the WarmInboxes cold email writing assistant at https://warminboxes.com/AI (a custom GPT on ChatGPT).”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
Takes no inputs.
- find_lead_lists
“Searches WarmInboxes' own catalogue of about 1,000 free B2B lead lists, by industry, role and country, as published at https://warminboxes.com/leads.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs
querystring“What they want, in plain words: an industry, role or country, e.g.”categorystring“Optional category to narrow to, e.g.”limitnumber“How many matches, 1 to 10.”
- find_toolson 17 other servers
“Find the WarmInboxes free tool for a task ("check my email headers", "clean a CSV", "will this land in spam") and say how to use it: the MCP tool to call here, or the page to send the person to when …”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs
taskstring“The job, in plain words, e.g.”callableOnlyboolean“Only tools you can call from this server.”limitnumber“How many matches, 1 to 10.”
- find_resources
“Search what WarmInboxes publishes: cold email guides, deliverability playbooks, original studies and their datasets, costed infrastructure recipes, tool demo videos, inbox guides per sequencer and AI…”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
3 inputs
querystring“A question or topic, e.g.”typestring“Optional: only this kind of resource.”limitnumber“How many matches, 1 to 10.”
- read_resourceon 4 other servers
“Read a WarmInboxes guide, study, playbook, dataset, recipe, comparison or changelog entry in full, as markdown.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
2 inputs, 1 required
urlstringrequired“The page, as find_resources returned it, e.g.”partnumber“Which part of a long page, from 1.”
- get_pricingon 192 other servers
“The WarmInboxes price list as data: prewarmed and fresh inboxes on Google Workspace, Microsoft 365 and Azure, every billing cycle, the safe daily send pace per inbox, and delivery time.”
Publisher declares: read-only yes · destructive no · idempotent yes · open-world no
Takes no inputs.
Each quoted sentence is the first sentence of the publisher’s own description. The kind of tool and the “changes data” mark are our AI model’s reading of that description, not something we tested: two differently worded runs had to agree, otherwise no label is shown, and nobody has checked them by hand. A tool without the “changes data” mark is described as only reading, searching or calculating, or the two runs did not agree. No tool was called. Read the publisher’s full description before relying on it. “Publisher declares” lists the hints the server itself sends with the tool (MCP annotations: read-only, destructive, idempotent, open-world); they are the publisher's claims, not checked by us. Inputs are the parameters in the tool's own input schema: name, declared type, whether it is required, and the first sentence of its description. Read 2026-10-23.
How well are its tools described?
Features #4 and #5
How clearly this server's own tool descriptions say what a tool does, and how consistent its tool list is. The first part is an AI model's yes/no reading of each description; the second part is counted. We do not turn it into a grade.
Descriptions
AI reading of each description
- Says what the tool does
- 100% of 40 tools
- Says what it returns
- 100% of 40 tools
- States limits, defaults or errors
- 11% of 36 tools
- Says when to use it
- 4% of 24 tools
- Items covered per tool
- 2.5 of 4 on average
Counted from the listing
- Parameters with a description
- 100% of 119
- Tools with a description
- 100% of 51
- Typical description length
- 332 characters
The tool set
Counted from the listing
- Tools
- 51
- Size of the list
- about 11,639 tokens for an agent to load (characters ÷ 4)
- Naming
- 51 of 51 names use snake_case
AI reading: easy to mix up
No pair found.
The AI items cover 40 of 51 tools: for a tool where two differently worded runs disagreed, that item is left out. They were not checked by hand, and no tool was called. “Easy to mix up” means two tools whose names or descriptions overlap without saying how they differ; the AI found none, comparing tools within groups of 40. We do not rate whether the tool set is complete or whether side effects are spelled out, because our AI reading of those was not reliable enough.
How do I add it to my client?
Config from the registry entry
From the remote endpoint (Streamable HTTP)
We connected to this URL on 2026-10-23 (a read-only session: no tool was called).
Add to CursorAn install link in the format Cursor documents, holding the Cursor config below.
Claude Desktop or claude.ai
Settings → Connectors → Add custom connector, then paste: https://warminboxes.com/mcp
Cursor · .cursor/mcp.json in a project, or ~/.cursor/mcp.json
{
"mcpServers": {
"deliverability-tools": {
"url": "https://warminboxes.com/mcp"
}
}
}VS Code · .vscode/mcp.json
{
"servers": {
"deliverability-tools": {
"type": "http",
"url": "https://warminboxes.com/mcp"
}
}
}VS Code (command line) · Bash or zsh terminal (macOS, Linux)
code --add-mcp '{"name":"deliverability-tools","type":"http","url":"https://warminboxes.com/mcp"}'Claude Code
claude mcp add --transport http deliverability-tools https://warminboxes.com/mcp
Try it in the MCP Inspector · runs on your machine, opens in your browser · Node 22.19+
npx @modelcontextprotocol/inspector@2.11.0 --server-url https://warminboxes.com/mcp --transport http
- The server runs on the operator's infrastructure; it may ask you to sign in when you first connect.
- The MCP Inspector lists the server's tools, resources and prompts; a tool you call there runs for real.
Built from the server's registry entry with each client's documented format (checked 2026-10-14; the Cursor link and the VS Code command 2026-10-19; the MCP Inspector command 2026-10-21). Values in < > are yours to fill in; this page never contains a key. Where the server needs a setting the entry does not declare, it can still fail to start.
Does the registry listing match what we found?
Feature #6The registry verifies a package once, when it is published, and does not re-check it. A difference below is about the listing, not a judgement of the publisher.
| Registry says | We found | Result | Source · date |
|---|---|---|---|
| Remote endpoint warminboxes.com/mcp | Session opened | matches | our test · 2026-10-23 |
| No credential declared as required | Opened a session without any credential | matches | our test · 2026-10-23 |
Choosing
Record checks
Public records · not a safety rating1 of 2 record checks met · 7 do not apply
- Not ranked by downloads: a remote server publishes no download figure
- Not ranked by stars: no public GitHub repository
- MetRegistry entry is active and says how to run itActive, with a package or a remote address.
- Not metSource repository link opensThe registry entry gives no repository link.
- Does not applyRepository is not archivedNo public GitHub repository to read.
- Does not applyCode pushed to the repository in the 90 days before our checkNo public GitHub repository to read.
- Does not applyRepository publishes a security policy (SECURITY.md)No public GitHub repository to read.
- Does not applyPackage names its licence with a standard (SPDX) identifierRemote server: it ships no package.
- Does not applyThe version the registry lists can be installed and is not withdrawnRemote server: it ships no package.
- Does not applynpm package carries build provenance (attestation)Remote server: it ships no package.
- Does not applyNo known critical or high advisory in the package or its dependenciesRemote server: it ships no package.
Read from public records only: the registry entry, npm/PyPI, GitHub and advisory databases, checked 2026-10-23. No tool was called. Only “met” and “not met” are counted, so the total differs between servers; a check that does not apply or that we could not run is listed, never counted against it. It is not a safety rating. How each check works · Leaderboards
Common questions about com.warminboxes/deliverability-tools
Answered from the data aboveDoes com.warminboxes/deliverability-tools need an API key or sign-in?
It opened a session without any credential on 2026-10-23. The registry entry declares no required credential; no declaration is not a guarantee.
Has com.warminboxes/deliverability-tools been security tested?
Partly. 2 of the 14 checks that apply to it were exercised. We connected and read what the server declares, but did not call its tools: ProtocolProbe calls no server's tools for anything it publishes. This is our choice, not a block by the server. No security verdict is published before verification.
What can com.warminboxes/deliverability-tools do?
It lists 51 tools. In our AI model's reading of their descriptions (two runs had to agree, nobody checked it by hand), they include tools that read or search, generate content and calculate or convert. We did not call any tool, so this describes the text, not the behaviour.
Can com.warminboxes/deliverability-tools change or delete data?
None of its 51 tools is described as changing anything (our AI model's reading of the descriptions; nobody checked it by hand). We did not call any tool.
Found this page useful?
Anonymous · no sign-inA quick, anonymous reaction — no account, no email. One per kind from your browser. The tally updates when the page is next refreshed, and it is only a rough count, never a safety rating or a measured number of people.
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Active servers whose topic is also “commerce-and-marketing” and that have at least one tool of the same kind; most kinds in common first, then most GitHub stars. The topic and the tool kinds are an AI model's reading of the publishers' descriptions, not checked by hand. Similar is not a recommendation.
Compare with another server
Side by side: registry entry, our read-only session, the tools and the 18 classification fields. Same values as each page; no score.
Security testing
What did we test, and what did we leave out?
18 checks · features #1, #2
Not probed (we call no server's tools)
We connected and read what the server declares, but did not call its tools: ProtocolProbe calls no server's tools for anything it publishes. This is our choice, not a block by the server. No security score is given; a check we did not run is never counted as passed.
- Inventory: exercised
- Hidden instructions: exercised
- Real execution: not run · our policy
- Secret leak: not run · nothing to check it against
- Internal addresses: not run · our policy
- Unconfirmed changes: not run · our policy
- Bad input: not run · our policy
- Model requests: not run · nothing to check it against
- Sensitive questions: not run · nothing to check it against
- Folder boundary: not run · our policy
- Log leaks: not run · nothing to check it against
- Hidden content: not run · nothing to check it against
- Fake assistant turns: not applicable
- Token passthrough: not applicable
- Token audience: not applicable
- Sign-in redirect: not run · our policy
- Consent handling: not testable from outside
- Sign-in metadata: not applicable
2 exercised12 not run (reason given)4 not applicable
Each check ends in exactly one state: exercised, not run (with the reason), or not applicable (with the reason). 2 of the 14 checks that apply to it were exercised. We do not publish security-check outcomes for named servers.
- 1Inventory
tool-listReads the declared tools, resources and prompts.exercised - 2Hidden instructions
description-poisoningLooks for hidden instructions in tool descriptions.exercised
- 3Real execution
real-executionCalls a tool and checks what really happens.This check calls the server's tools. ProtocolProbe calls no server's tools for anything it publishes; an operator can run this check on their own server with our self-test command.not run · our policy - 4Secret leak
canary-leakPlants a fake secret and checks whether it leaks.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against - 5Internal addresses
ssrfChecks whether a tool can be steered to internal addresses.This check calls the server's tools. ProtocolProbe calls no server's tools for anything it publishes; an operator can run this check on their own server with our self-test command.not run · our policy - 6Unconfirmed changes
write-without-confirmationChecks whether tools that change data act without asking.This check calls the server's tools. ProtocolProbe calls no server's tools for anything it publishes; an operator can run this check on their own server with our self-test command.not run · our policy - 7Bad input
error-handlingSends bad input and watches how the server answers.This check calls the server's tools. ProtocolProbe calls no server's tools for anything it publishes; an operator can run this check on their own server with our self-test command.not run · our policy - 8Model requests
samplingChecks whether the server asks the client's model to act for it.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against - 9Sensitive questions
elicitation-sensitive-dataChecks whether the server asks users for sensitive data.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against - 10Folder boundary
root-boundaryChecks whether the server reaches outside the folders it was given.This check calls the server's tools. ProtocolProbe calls no server's tools for anything it publishes; an operator can run this check on their own server with our self-test command.not run · our policy - 11Log leaks
logging-side-channelChecks whether log messages carry data they should not.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against - 12Hidden content
audience-hidingChecks resources that hide content from the user.This check needs content the server returns, and nothing was read or called.not run · nothing to check it against - 16Sign-in redirect
open-redirectChecks the sign-in redirect for abuse.Testing the sign-in redirect means sending probes to the operator's sign-in service, which we do not do.not run · our policy - 17Consent handling
confused-deputyChecks consent handling when one service acts for another.Depends on the operator's own consent screen, which differs per server and cannot be tested from outside.not testable from outside
- 13Fake assistant turns
fake-assistant-turnChecks prompts that pose as the assistant's own words.The server exposes no prompts.not applicable - 14Token passthrough
token-passthroughChecks whether the server forwards a user's token to other services.The server opened a session without sign-in, so there is no token flow to check.not applicable - 15Token audience
token-audience-validationChecks whether tokens meant for another service are accepted.The server opened a session without sign-in, so there is no token flow to check.not applicable - 18Sign-in metadata
oauth-url-schemeChecks the published sign-in metadata for unsafe URLs.No sign-in (OAuth) metadata is published, so there are no sign-in addresses to check.not applicable
Source: our own test, 2026-10-23, mcp-runtime-engine@0.1.0. Which checks count and why follows our published scoring model.
What happened during the test?
Feature #8
The steps in order, as the test record holds them.
- 0 msStarted a read-only session with the server's remote endpoint
- 2,188 msConnected after 0 redirects. No credential was sent or needed.
- Read the inventory: 51 tools, 0 resources, 0 prompts.
- 6,834 msFinished: 2 checks exercised.
Reference
How is it classified?
18 fields
One value per field, each with its source. Fields written by AI models are marked. A field with no value says why.
“Not stated” means the source did not state it; “does not apply” means it does not apply to this kind of server; “our limit” means our own lookup failed. A linked value opens the directory filtered to the same value.
Cite or correct this page
Sources and corrections
Suggested citation
ProtocolProbe. “com.warminboxes/deliverability-tools: MCP server record.” Data checked 2026-10-23. https://protocolprobe.com/mcp/servers/com.warminboxes/deliverability-tools
Figures are valid for the date shown. Our facts on this page are CC BY 4.0: reuse them with a link and the check date. Quoted text (the publisher’s descriptions, website quotes, tool names) is not ours to license.
As JSON: this record in the API · API documentation.
Badge for your README
[](https://protocolprobe.com/mcp/servers/com.warminboxes/deliverability-tools)
It shows this server's record-check count: facts from public records, no tool called. It is not a security rating or a pass. It links here and updates after each data reload.
Something wrong, or is this yours?
If a fact here is wrong, tell us and we will re-check it. If you operate this server, you can run our checks on it yourself with the free self-test command; we call no server’s tools ourselves for anything shown here.
Write to hello@protocolprobe.com · corrections log · methodology