SenderKit

Name: SenderKit
Author: senderkit

by senderkitversion 0.1.0i★ –iRuns in the cloud

Registry namecom.senderkit/senderkit

Install

Overview

Description from the maker (original English)

Build and send email, SMS, and push straight from your AI agent.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Chat & email

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://mcp.senderkit.com

Run this in your terminal

claude mcp add --transport http senderkit https://mcp.senderkit.com

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "senderkit": {
      "url": "https://mcp.senderkit.com"
    }
  }
}

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.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "senderkit": {
      "type": "http",
      "url": "https://mcp.senderkit.com"
    }
  }
}

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:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://mcp.senderkit.com

Menu 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.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

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

✓ Pass
Maker matches the repo
The registry name was verified against the domain senderkit.com (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Chat & emaili

More stars than 0% of the other 1762 servers in this category
Published to the registry more recently than 11% of the other 1762 servers in this category
Basic checks equal to or better than 100% of the other 1762 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is SenderKit safe?

It passed 1 of 1 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.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

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.

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 5 months ago.

Which apps can use it?

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.

What can I use instead?

In the same category: Vexa, emailmd, MCP WhatsApp Cloud

Alternatives

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

Vexa

by Vexa-ai

Meeting bot and transcripts for Google Meet, Teams and Zoom. Live or after, speakers labelled.

Runs in the cloud★ 2,949Apache-2.0Updated 2 months ago

Install

emailmd

by anypost

Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.

Computer or cloud★ 1,385MITUpdated 30 days ago

Install

MCP WhatsApp Cloud

by codespar

MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API

Runs on your computer★ 277MITUpdated 5 months ago

Install

README from the maker

Open the README

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.

SenderKit Skills

Add transactional email, SMS, push, and web-push notifications to any app — straight from your AI coding agent. Portable AI-agent skills for SenderKit, packaged as a plugin for Claude Code, OpenAI Codex, Cursor, opencode, and other Agent Skills-compatible coding assistants.

SenderKit sends email, SMS, push, and web-push directly, and can also route through providers like Resend, SendGrid, Postmark, Mailgun, SES, Twilio, FCM, APNs, and Expo — so your app isn't locked into one vendor. These skills let an agent wire SenderKit into your codebase and operate it at runtime over MCP.

This repository contains one senderkit plugin with three related skills:

senderkit-integration - add SenderKit to an app, or replace/route an existing email, SMS, or push provider through it.
senderkit-mcp-messaging-operations - send and inspect messages at runtime through the SenderKit MCP connector.
senderkit-email-deliverability - authenticate a sending domain (SPF/DKIM/DMARC) so email reaches the inbox.

What can I ask?

You don't need to name SenderKit — these skills activate on everyday messaging requests. Examples:

You ask	Skill that helps
"Add a welcome email when a user signs up"	`senderkit-integration`
"Set up SMS OTP / verification codes"	`senderkit-integration`
"Add push notifications to this project"	`senderkit-integration`
"Send password-reset and receipt emails"	`senderkit-integration`
"Switch my email provider to SenderKit (or route through it, no lock-in)"	`senderkit-integration`
"Send a test email and check its delivery status"	`senderkit-mcp-messaging-operations`
"Why did this message fail? Cancel that scheduled send"	`senderkit-mcp-messaging-operations`
"Why are my emails going to spam? Set up DKIM/SPF/DMARC"	`senderkit-email-deliverability`

Rule of thumb: integration writes SenderKit into your code; messaging operations sends and inspects messages at runtime via MCP.

Install

This repo ships per-platform metadata — Claude Code (.claude-plugin/), OpenAI Codex (.codex-plugin/), Cursor (.cursor-plugin/), and opencode (opencode.json) — and the authored skills under ./skills/. Pick your agent below; each path ends with a quick check so you know it worked.

Any agent (skills CLI)

The skills CLI installs the skills into the right location for whichever agent you use (Claude Code, Codex, Cursor, opencode, and others):

npx skills add senderkit/senderkit-skills

It detects your agent, lists the three skills, and copies the ones you pick. This installs the skills only — to get the senderkit_* MCP tools, also connect the MCP server (see Connect the SenderKit MCP server).

Check it works: ask your agent *"Use senderkit-integration to add a welcome email."*

Claude Code

From the marketplace (recommended):

/plugin marketplace add senderkit/senderkit-skills

/plugin install senderkit@senderkit-skills

From a local checkout (for development):

claude --plugin-dir .

This loads both skills and the SenderKit MCP server from the repo's .mcp.json (OAuth, no key stored). Run /mcp, sign in, and pick a workspace and test/live mode.

Check it works: run /mcp — the senderkit server should be connected — or ask *"Use senderkit-integration to add a welcome email."*

OpenAI Codex

"ChatGPT" support means Codex, OpenAI's coding agent (CLI / IDE extension / app). The ChatGPT chat app does not load skills.

Codex discovers skills from .agents/skills/ directories. Vendor the skills into your user scope (available in every repo) or a single repo's scope:

git clone https://github.com/senderkit/senderkit-skills.git

mkdir -p ~/.agents/skills cp -R senderkit-skills/skills/senderkit-integration ~/.agents/skills/ cp -R senderkit-skills/skills/senderkit-mcp-messaging-operations ~/.agents/skills/

repo-scoped instead? copy into /.agents/skills/

Restart Codex so it picks them up. Connect MCP: the bundled .mcp.json (referenced from .codex-plugin/plugin.json) points Codex at https://mcp.senderkit.com over OAuth — run codex mcp login senderkit to sign in (no key stored). Prefer an API key? See API key (optional) below, or run senderkit mcp install --client codex.

Check it works: run /skills (the SenderKit skills should be listed) or invoke one explicitly with $senderkit-integration.

Distributing the full plugin (skills + MCP) to a team? Publish this repo as a Codex marketplace and install via codex → /plugins. See https://developers.openai.com/codex/plugins/build.

Cursor

For an individual install, load this repo as a local plugin:

git clone https://github.com/senderkit/senderkit-skills.git

ln -s "$(pwd)/senderkit-skills" ~/.cursor/plugins/local/senderkit

Reload Cursor (Developer: Reload Window). Skills show up under Settings → Rules & Skills and can be invoked with /senderkit-integration. Connect MCP: the bundled .cursor-plugin/plugin.json points Cursor at https://mcp.senderkit.com over OAuth — open Settings → MCP, toggle the server on, and sign in (no key stored). Prefer an API key? See API key (optional) below, or run senderkit mcp install --client cursor.

For teams, import this GitHub repo as a Team Marketplace (Dashboard → Settings → Plugins; Teams/Enterprise plans). See https://cursor.com/docs/plugins.

Check it works: type /senderkit-integration in chat, or ask *"Send a test email and check its status via SenderKit MCP."*

opencode

opencode auto-discovers Agent Skills (one folder per skill, SKILL.md inside) from ~/.config/opencode/skills/ (user scope, every repo) or .opencode/skills/ (repo scope) — and also reads .claude/skills/ and .agents/skills/, so the same skill folders work unchanged. Vendor them in:

git clone https://github.com/senderkit/senderkit-skills.git

mkdir -p ~/.config/opencode/skills cp -R senderkit-skills/skills/senderkit-integration ~/.config/opencode/skills/ cp -R senderkit-skills/skills/senderkit-mcp-messaging-operations ~/.config/opencode/skills/ cp -R senderkit-skills/skills/senderkit-email-deliverability ~/.config/opencode/skills/

repo-scoped instead? copy into /.opencode/skills/

Connect MCP: merge the mcp block from this repo's opencode.json into your own opencode.json (project root or ~/.config/opencode/opencode.json). It points opencode at https://mcp.senderkit.com as a "type": "remote" server with no auth, so opencode runs the OAuth flow on first use (no key stored). Sign in with opencode mcp auth senderkit. Prefer an API key? See API key (optional) below.

Check it works: run opencode mcp list (the senderkit server should be listed) or ask *"Use senderkit-integration to add a welcome email."*

Connect the SenderKit MCP server

Installing the plugin/skills gives you the senderkit_* MCP tools. Auth differs per client:

Claude Code — OAuth via the repo's .mcp.json. Run /mcp, sign in, pick a workspace and test/live mode. No API key is stored in the repo.
Cursor — OAuth via the bundled .cursor-plugin/plugin.json. Toggle the server under Settings → MCP and sign in. No API key is stored in the repo.
Codex — OAuth via the bundled .mcp.json. Run codex mcp login senderkit to sign in. No API key is stored in the repo.
opencode — OAuth via the bundled opencode.json ("type": "remote", url only). Run opencode mcp auth senderkit to sign in. No API key is stored in the repo.

API key (optional)

Every shipped manifest is OAuth-only, so no credential is committed. mcp.senderkit.com also accepts an API key if you'd rather skip OAuth — set SENDERKIT_API_KEY (the sk_live_ / sk_test_ prefix selects mode) and add it in your own MCP config:

Cursor / Claude Code / Windsurf — add an Authorization header, e.g. in ~/.cursor/mcp.json:

"mcpServers": { "senderkit": { "url": "https://mcp.senderkit.com", "headers": { "Authorization": "Bearer ${env:SENDERKIT_API_KEY}" } } } }

- **Codex** — add `bearer_token_env_var = "SENDERKIT_API_KEY"` to the `senderkit` server in your `~/.codex/config.toml`.

opencode — in your own opencode.json, set "oauth": false on the senderkit server and add a header: "headers": { "Authorization": "Bearer {env:SENDERKIT_API_KEY}" } (opencode interpolates {env:VAR}).

Other clients (Windsurf, VS Code, Zed, Claude Desktop) and manual config: see skills/senderkit-mcp-messaging-operations/README.md and https://docs.senderkit.com/mcp/installation. The SenderKit CLI can also write the config for you: senderkit mcp install --client cursor (or codex, claude-code, vscode, zed, all).

Skills

SenderKit Integration

Use senderkit-integration when an agent needs to modify an application: detect the stack, add SenderKit, migrate provider calls, preserve existing notification behavior, and verify the integration before live traffic.

Suggested prompt:

Use $senderkit-integration to add SenderKit transactional messaging to this project.

Claude Code plugin command:

/senderkit:senderkit-integration

SenderKit MCP Messaging Operations

Use senderkit-mcp-messaging-operations when an agent has access to the SenderKit MCP server and needs to send messages, inspect templates, check message status, or cancel pending sends through MCP tool calls.

Suggested prompt:

Use $senderkit-mcp-messaging-operations to send a test message and verify its status through SenderKit MCP.

Claude Code plugin command:

/senderkit:senderkit-mcp-messaging-operations

SenderKit Email Deliverability

Use senderkit-email-deliverability when transactional email needs to be authenticated to reach the inbox: diagnose current SPF/DKIM/DMARC with dig, generate the exact records to add, point to the SenderKit dashboard for issued values, and verify publication.

Suggested prompt:

Use $senderkit-email-deliverability to diagnose and fix SPF, DKIM, and DMARC for my sending domain.

Claude Code plugin command:

/senderkit:senderkit-email-deliverability

Repository layout

senderkit-skills/

Official docs

SenderKit MCP overview: https://docs.senderkit.com/mcp/overview
SenderKit MCP tools: https://docs.senderkit.com/mcp/tools
SenderKit OpenAPI: https://www.senderkit.com/openapi.yaml

SenderKit

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Chat & emaili

Common questions

Alternatives

Vexa

emailmd

MCP WhatsApp Cloud

README from the maker

SenderKit Skills

What can I ask?

Install

Any agent (skills CLI)

Claude Code

OpenAI Codex

repo-scoped instead? copy into /.agents/skills/

Cursor

opencode

repo-scoped instead? copy into /.opencode/skills/

Connect the SenderKit MCP server

API key (optional)

Skills

SenderKit Integration

SenderKit MCP Messaging Operations

SenderKit Email Deliverability

Repository layout

Official docs