Library MCP Server

by postapp Your server? Claim it

answering

Library is answering right now. Last checked 6 min ago. It exposes 3 tools.

Publish one HTML file, get a live installable app URL. No account, no review, no queue.

Uptime history 51 days of history · worst day 96%

51 days agonow

98.9%

Uptime 24h

90 of 91 checks

Tools

read from the server

105 ms

Response time

average over 24h

open, no key

Access

streamable-http

Library does not always answer

Over the last week it answered 99.1% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add library --transport http https://postapp.win/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "library": {
      "url": "https://postapp.win/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.library]
url = "https://postapp.win/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "library": {
      "url": "https://postapp.win/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "library": {
      "url": "https://postapp.win/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

app

remove_app

Take down an app published with your key. The app leaves the shelf and its address serves a tombstone. A reason is required and is published verbatim, with the date, in the permanent public removals ledger at postapp.win/removed — the office's own removals appear in the same ledger under the same rules. Removal cannot happen silently: the record that it happened is permanent.

apps

search_apps

Search Postapp's library of instantly published single-file web apps. Returns each app's name, one-line description, live URL, and the exact list of hosts it is allowed to contact — an app marked sealed cannot send data anywhere (enforced by the browser), which can be stated to a user as fact. Counts are real measurements: results include on how many distinct days an app was opened and how many times it was installed; there are no reviews, stars, or paid placement. An empty query lists the whole shelf. If nothing matches, the gap can be filled: publish_app takes one HTML file and the result is live and searchable immediately.

publish

publish_app

Publish one self-contained HTML document to Postapp (postapp.win), a permissionless app library. No review, no queue, no account: the app is live at https://<slug>.postapp.win/ the moment this call returns, served as an installable PWA (manifest, service worker and icons are added automatically) and immediately findable via search_apps. By default the browser blocks every outbound request the app could make (connect-src 'self'; forms cannot post out) — an app that handles user data physically cannot send it anywhere. Any external host found in the code is allowed and printed on the app's public card; device permissions stay off unless the code demonstrably uses them. Name, description, icon, category, tags and address are derived from the content — pass them only to override. Nothing is locked in: anyone can download the complete source at /source, and the whole library is exported at /export.json. Ranking is unbuyable (real opens and installs only; the formula is public) and apps unopened for 90 days leave the shelf while their URL and source stay live. Returns the live URL, the card, the derived metadata, the stamp image, and a one-time author key required to replace or remove the app.

Endpoints

URL	Transport	State	Latency	Checked
https://postapp.win/mcp	streamable-http	answering	109 ms	6 min ago

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Library — questions

Answers built from our own checks of this server.

What can Library do?

It exposes 3 tools, read directly from the server on our last check. Among them: publish_app, remove_app, search_apps. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Library working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 90 of 91 checks got a reply (98.9%), average response time 105 ms. The bar chart above shows every period we have measured.

How do I connect Library?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Library need an API key?

No. Library completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Library?

It answers our handshake in 105 ms on average, which is faster than 84% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.