Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Description from the maker (original English)
Read Enginemailer subscribers, lists and campaigns; add subscribers, create and send campaigns.
These three are never merged into one score: opinions, measurements and popularity are different things.
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
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Works in Claude on the web, desktop and mobile:
https://enginemailer.usefulapi.io/mcpRun this in your terminal
claude mcp add --transport http enginemailer https://enginemailer.usefulapi.io/mcpPaste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"enginemailer": {
"url": "https://enginemailer.usefulapi.io/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Paste into .vscode/mcp.json in your project
{
"servers": {
"enginemailer": {
"type": "http",
"url": "https://enginemailer.usefulapi.io/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
https://enginemailer.usefulapi.io/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.
enginemailer_get_subscriberOne subscriber by email: id, status and all custom field values. GET /restapi/subscriber/emsubscriber/getSubscriber.
enginemailer_list_subscriber_categoriesThe subscriber category tree: each category with its subcategories (ids, names). Use the subcategory ids when adding or updating subscribers and when assigning campaign recipients. GET /restapi/subscriber/emsubscriber/getSubCategory.
enginemailer_list_custom_fieldsThe subscriber custom field definitions (key, name, type). Use the keys when adding or updating subscribers. GET /restapi/subscriber/emsubscriber/getCustomField.
enginemailer_add_subscriberWRITE: add a subscriber to the account (optionally into subcategories, with custom field values). Only add people who consented to marketing email. Free accounts may insert 50 subscribers a day, paid accounts 10,000. POST /restapi/subscriber/emsubscriber/insertSubscriber.
enginemailer_update_subscriberWRITE: change an existing subscriber's subcategories and/or custom fields. subcategories_mode: append (default), remove (drop the given subcategories) or replace (the given list becomes the full list). custom_fields_mode: update_given (change only the given fields) or replace_all
enginemailer_unsubscribe_subscriberWRITE: unsubscribe a subscriber so they no longer receive campaigns. Reversing it needs the subscriber to opt in again in Enginemailer. GET /restapi/subscriber/emsubscriber/unSubSubscriber.
enginemailer_save_subscriber_categoryWRITE: create a subscriber category (category_id 0) or update one (its id), with subcategories (subcategory_id 0 creates one). Names and descriptions max 128 characters. POST /restapi/subscriber/emsubscriber/updateCategory.
enginemailer_list_campaignsList campaigns that have NOT been delivered yet (drafts and scheduled ones): id, name, subject, sender and schedule. Delivered campaigns are not listed by the API; use enginemailer_get_campaign_stats with a known id. Needs a paid account. GET /restapi/campaign/emcampaign/ListCamp
enginemailer_get_campaign_statsDelivery results of a DELIVERED campaign: emails sent, delivered, bounces, opens, unique opens, clicks, unique clicks, unsubscribes, spam complaints. Needs a paid account. GET /restapi/campaign/emcampaign/getcampaigndeliverystatus.
enginemailer_list_campaign_categoriesThe categories that campaign recipients can be filtered by (id, name, description). Needs a paid account. GET /restapi/campaign/emcampaign/GetCategoryList.
enginemailer_list_campaign_subcategoriesThe subcategories of one campaign category (id, name, description); use these ids in enginemailer_assign_campaign_recipients. Needs a paid account. GET /restapi/campaign/emcampaign/GetSubCategoryList.
enginemailer_create_campaignWRITE: create a campaign DRAFT. Nothing is sent: assign recipients with enginemailer_assign_campaign_recipients, then send with enginemailer_send_campaign. The sender domain must be verified in Enginemailer; max 200 campaigns per account. Needs a paid account. POST /restapi/Campa
enginemailer_assign_campaign_recipientsWRITE: set who a campaign will go to: all subscribers, or the subscribers in the given subcategory ids (match_type any = OR, all = AND). Does not send anything. Needs a paid account. POST /restapi/campaign/emcampaign/AssignRecipientList.
enginemailer_send_campaignWRITE, SENDS EMAIL TO CUSTOMERS NOW and cannot be undone: delivers the campaign to its assigned recipients immediately. The campaign needs at least one recipient and must not be scheduled or already delivered. Show the user the campaign and its audience and get their go-ahead fir
enginemailer_send_transactional_emailWRITE, SENDS ONE EMAIL NOW and cannot be undone: submits a transactional email to one recipient (plus optional CC/BCC). Needs a sender address on a verified domain; give either subject + content_html, or a template_id from the Enginemailer portal (the template supplies subject an
enginemailer_start_transactional_report_exportStart a CSV export of the transactional email delivery report for a period (start date at most 60 days back). Returns an export id; poll it with enginemailer_check_transactional_report_export. Creates a report file only; nothing is sent. POST /RESTAPI/V2/Submission/Report/Export.
enginemailer_check_transactional_report_exportStatus of a report export (Processing or Complete); when complete it includes the CSV download URL. POST /RESTAPI/V2/Submission/Report/CheckExport (read-only).
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026
The registry name was verified against the domain usefulapi.io (the registry checks domain ownership)
We have not read this repo from GitHub yet
We have not read this repo from GitHub yet
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Read 17 tool descriptions and found no hidden instructions to the AI
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
The registry does not list a required key, though some servers ask you to sign in on first use.
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
The GitHub repo last changed –, and the latest version (1.14.3) reached the registry yesterday.
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
In the same category: Spec Driven Development, Remote Desktop Commander, yontu
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Türkçe yazı denetimi: TDK kuralları, yapay zekâ izleri, metin türüne göre üslup.
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Read Enginemailer subscribers, lists and campaigns; add subscribers, create and send campaigns.
Live endpoint: https://enginemailer.usefulapi.io/mcp · Homepage: https://usefulapi.io/enginemailer
https://enginemailer.usefulapi.io/mcp.claude mcp add --transport http enginemailer https://enginemailer.usefulapi.io/mcp, then run /mcp to log in.{
"mcpServers": { "enginemailer": { "url": "https://enginemailer.usefulapi.io/mcp" } } }
Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your Enginemailer credentials.
Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/enginemailer/
On first connect you'll paste your Enginemailer API key (in Enginemailer open Manage account → API Keys and copy or create a key).
| Tool | Type | What it does |
|---|---|---|
enginemailer_get_subscriber | read | Get subscriber |
enginemailer_list_subscriber_categories | read | List subscriber categories |
enginemailer_list_custom_fields | read | List custom fields |
enginemailer_add_subscriber | write | Add subscriber |
enginemailer_update_subscriber | write | Update subscriber |
enginemailer_unsubscribe_subscriber | write | Unsubscribe subscriber |
enginemailer_save_subscriber_category | write | Create or update subscriber category |
enginemailer_list_campaigns | read | List undelivered campaigns |
enginemailer_get_campaign_stats | read | Get campaign delivery stats |
enginemailer_list_campaign_categories | read | List campaign categories |
enginemailer_list_campaign_subcategories | read | List campaign subcategories |
enginemailer_create_campaign | write | Create campaign (draft) |
enginemailer_assign_campaign_recipients | write | Assign campaign recipients |
enginemailer_send_campaign | write | Send campaign NOW |
enginemailer_send_transactional_email | write | Send transactional email |
enginemailer_start_transactional_report_export | write | Start transactional report export |
enginemailer_check_transactional_report_export | read | Check transactional report export |
enginemailer_usage_status | meta | Usage status (free-tier meter) |
enginemailer_request_feature | meta | Request a missing feature |
enginemailer_upgrade | meta | Upgrade to Pro or Pro+ |
enginemailer_cancel_subscription | meta | Cancel the Pro subscription |
read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Pro (per user) | $9/mo or $90/yr (2 months free) | Unlimited* |
\*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to support@usefulapi.io.
Pro covers this server only. Subscribe with enginemailer_upgrade (it returns a Stripe Checkout link). Cancel any time with enginemailer_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running enginemailer_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
MIT © usefulapi. Not affiliated with or endorsed by Enginemailer.