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PopNx MCPMCP servers for people who use AI · explained in plain words
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Postbot

by postbot.czversion 0.1.0i★ –iComputer or cloud
Registry namecz.postbot/postbot

How to install

What it does

Send real paper letters in the Czech Republic, ordinary or registered, via Česká pošta.

  • Connects Computer or cloud
  • Account or key Cloud: No key needed · Local: Needs POSTBOT_CP_USER, POSTBOT_CP_PASSWD, POSTBOT_TEST
  • Category Other

Install

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

Passed 2/3 checks · What you ask goes through the maker’s server (postbot.cz)

First: which AI do you use?

Pick your app and the steps appear below.

Works with Claude · about 2 min

No key, nothing to install · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it

  1. Open Claude’s Connectors page

    CustomizeConnectors

    CustomizeConnectors1+ Add2https://…3Add4

  2. Click “+ Add” → “Add custom connector” and fill in these 2 fields

    Copy each value into the field with the same name in Claude, then click Continue

    Name · Name

    Checking the commands · copy buttons appear once they pass

    Remote MCP server URL · Address

    Checking the commands · copy buttons appear once they pass

    Leave Authentication as Claude detected it, then click Add

  3. Turn it on in a chat

    +ConnectorsPostbot

  4. Try it

    Use Postbot and tell me what you can do for me, then show me one thing

    ✓ If Claude says it is using Postbot or shows a Postbot tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with ChatGPT, depending on your plan

Full MCP: ChatGPT Business, Enterprise or Edu on the web · Pro: connects with read/fetch permissions, so tools that change data may not work · Plus: not confirmed in OpenAI’s docs; if you see an add-custom-MCP option on the Plugins page you can try these steps · web only

  1. Open ChatGPT’s add-MCP page on the web

    Plugins+Add custom MCP server

    ChatGPTPlugins1+2https://…3Create4

  2. Fill in the name and address

    Enter a name, paste the address under Connection, tick the risk warning and click Create as a plugin

    Name · Name

    Checking the commands · copy buttons appear once they pass

    Connection · Address

    Checking the commands · copy buttons appear once they pass

  3. Pick Postbot in a chat

    Start a new chat and pick Postbot from your plugins before typing

  4. Try it

    Use Postbot and tell me what you can do for me, then show me one thing

    ✓ If ChatGPT says it is using Postbot or shows a Postbot tool in the answer, you are connected

Menu names checked against OpenAI’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Claude Code · about 2 min

No key, nothing to install

  1. Open Terminal

    Mac: press Command+Space and type Terminal · Windows: open PowerShell

  2. Paste this command and press Enter

    Checking the commands · copy buttons appear once they pass

  3. Type /mcp in Claude Code

    You should see Postbot listed as connected

  4. Try it

    Use Postbot and tell me what you can do for me, then show me one thing

    ✓ If Claude Code says it is using Postbot or shows a Postbot tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 2 min

No key, nothing to install

  1. Click this button to open Cursor

    Checking the commands · copy buttons appear once they pass

  2. Open the AI chat in Cursor in Agent mode

  3. Try it

    Use Postbot and tell me what you can do for me, then show me one thing

    ✓ If Cursor says it is using Postbot or shows a Postbot tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 2 min

No key, nothing to install

  1. Click this button to open VS Code

    Checking the commands · copy buttons appear once they pass

  2. Open the AI chat in VS Code in Agent mode

  3. Try it

    Use Postbot and tell me what you can do for me, then show me one thing

    ✓ If VS Code says it is using Postbot or shows a Postbot tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Address

Checking the commands · copy buttons appear once they pass

JSON settings are under “For developers” below

Stuck? Ask people who use Postbot💬 Discussion →
For developers: Terminal commands and JSON settings

Over the web

Claude Code

Checking the commands · copy buttons appear once they pass

Cursor (~/.cursor/mcp.json)

Checking the commands · copy buttons appear once they pass

VS Code (mcp.json)

Checking the commands · copy buttons appear once they pass

Installed on your computer

Claude Code

Checking the commands · copy buttons appear once they pass

Claude Desktop (claude_desktop_config.json)

Checking the commands · copy buttons appear once they pass

Cursor (~/.cursor/mcp.json)

Checking the commands · copy buttons appear once they pass

VS Code (mcp.json)

Checking the commands · copy buttons appear once they pass

Values you fill in

  • POSTBOT_CP_USER required env
    Česká pošta DopisOnline (PostServis) account username.
  • POSTBOT_CP_PASSWD secret required env
    Česká pošta DopisOnline (PostServis) account password.
  • POSTBOT_TEST required env
    No default. "1" = Sandbox (Česká pošta test endpoint, no real letters). "0" = live, billable letters.
  • POSTBOT_FROM_NAME env
    Default sender name. If unset, letters carry no default return address.
  • POSTBOT_FROM_COMPANY env
    Default sender company (optional).
  • POSTBOT_FROM_STREET env
    Default sender street. Used only when POSTBOT_FROM_NAME is set.
  • POSTBOT_FROM_HOUSE env
    Default sender house number. Used only when POSTBOT_FROM_NAME is set.
  • POSTBOT_FROM_CITY env
    Default sender city. Used only when POSTBOT_FROM_NAME is set.
  • POSTBOT_FROM_ZIP env
    Default sender postal code (PSČ). Used only when POSTBOT_FROM_NAME is set.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

Downloads per weeki
45/wk
Verified domain
✓ postbot.cz
Licencei
No licence stated
Connection
Computer or cloud
Transport
stdio, streamable-http
Latest versioni
0.1.0
Categoryi
Other
Published to registryi
Oct 15, 2026
Code last changedi
–
Maker
postbot.cz
Packages
npm: @postbotcz/mcp
Repo
–
Website
postbot.cz
Registry status
Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

ClaudeChatGPTGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast

Run on your computer in

ClaudeGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatRaycast

All apps, with pros and cons →

Related guides

Guide 85 checks before you install an MCPAbout 2 minutes each: check its page on our site and the permission request in your AI app before you say yes.4 min read

What it can do

Tool names and descriptions exactly as the server reported them on Nov 8, 2026. The maker wrote them, not us; we show them as plain text.

  • send_letter_cz

    Mail a real paper letter in the Czech Republic via Česká pošta. Provide the letter as a PDF (base64 or URL) or as markdown/text (we render it). Choose ordinary (obycejne) or registered (doporucene). Registered requires a `from` sender address.

  • get_letter_status

    Look up the delivery status of a sent letter by its ČP order code.

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 13, 2026

  • ! Caution

    Maker matches the repo

    The registry lists no source repo, so we cannot match the publisher (postbot.cz) to the code

  • … 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

  • ✓ Pass

    Endpoint responds

    Responded in 327 ms (HTTP 200)

  • – Not applicable

    Sign-in with OAuth

    No sign-in needed

  • ✓ Pass

    No hidden instructions in tool descriptions

    Read 2 tool descriptions and found no hidden instructions to the AI

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

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User reviews

No reviews yet

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Compared with others in Otheri

  • More stars than 0% of the other 19435 servers in this category
  • Published to the registry more recently than 60% of the other 19435 servers in this category
  • Basic checks equal to or better than 44% of the other 19435 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 Postbot safe?

It passed 2 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.

What keys or codes does it need?

You need to fill in: POSTBOT_CP_USER, POSTBOT_CP_PASSWD, POSTBOT_TEST

Does it run on my computer or in the cloud?

Either way works: install it on your computer or connect to the cloud version.

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 29 days 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 on the web (full MCP on Business and above; Pro read-only).

What can I use instead?

In the same category: World Monitor, Claude Flow, Windmill

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

World Monitor

Real-time global intelligence on conflict, markets, energy, trade, shipping and cyber. 104 tools.

by koala73Widely used★ 90.5KUpdated yesterday

Runs in the cloud✓ service owner · worldmonitor.app
How to connect

Claude Flow

AI orchestration with hive-mind swarms, neural networks, and 87 MCP tools for enterprise dev.

by ruvnetWidely used↓ 13.5K/wk★ 81.5KUpdated 14 months ago

Runs on your computer
Install

Windmill

Run Windmill scripts and flows and manage jobs, schedules, resources and variables.

by windmill-labsWidely used★ 18.6KUpdated yesterday

Runs in the cloud
How to connect

README from the maker

No README found in the repo