win.postapp/library
REMOTE · POSTAPP.WIN · SCANNED SEP 20
Publish one HTML file, get a live installable app URL. No account, no review, no queue.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability76
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 951 tokens (~237/item across 4 items; 3 tools + 1 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety75
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- 0 of 2 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "publish_app" implies "publish" and declares no destructiveHint at all, which the MCP spec reads as destructive by default. See how to fix → Fail
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the win.postapp/library MCP server?
win.postapp/library is a hosted endpoint at https://postapp.win/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · postapp.win
claude mcp add --transport http win-postapp-library 'https://postapp.win/mcp'
{
"mcpServers": {
"win-postapp-library": {
"url": "https://postapp.win/mcp"
}
}
} {
"servers": {
"win-postapp-library": {
"type": "http",
"url": "https://postapp.win/mcp"
}
}
} [mcp_servers.win-postapp-library] url = "https://postapp.win/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"win-postapp-library": {
"type": "remote",
"url": "https://postapp.win/mcp",
"enabled": true
}
}
} openclaw mcp add win-postapp-library --url 'https://postapp.win/mcp' --transport streamable-http
mcp_servers:
win-postapp-library:
url: "https://postapp.win/mcp" {
"McpServers": {
"win-postapp-library": {
"Transport": "http",
"Url": "https://postapp.win/mcp"
}
}
} assistant mcp add win-postapp-library -t streamable-http -u 'https://postapp.win/mcp'
{
"mcpServers": {
"win-postapp-library": {
"type": "http",
"url": "https://postapp.win/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 30 Aug 26 +1
- Stability: 0.97 → pass security
- 28 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.
- 26 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 24 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 1 Aug 26 0
- Schema quality: unverified → excellent ▲ functional
- Stability: unverified → 0.03 ▲ functional
- 31 Jul 26 0
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 20 Sept 2026 · Probed https://postapp.win/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=postapp.win | CN=WE1,O=Google Trust Services,C=US | 24 Jul 2026 | 22 Oct 2026 | ECDSA 256 | ECDSA-SHA256 | cf5641db6cb9505a0ebae7a5fc4dda74 |
| SANs: postapp.win, *.postapp.win | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of postapp.win. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| win. | present | 29737 | 8 | Verified |
| postapp.win. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://postapp.win/mcp | Verified | 200 | |
| http (plaintext) | http://postapp.win/mcp | Inconclusive | 405 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
publish_app ~466
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.
| Name | Type | Req | Description |
|---|---|---|---|
| about | string | – | Optional. Two or three sentences. |
| category | string | – | Optional. One of: tools reading writing calc play learn make life health other |
| html | string | – | The complete HTML document. One self-contained file, up to 2MB. |
| link_only | boolean | – | With url: only list it in the index, do not copy or serve it. No install, no source download. |
| name | string | – | Optional. Overrides the name worked out from the content. |
| slug | string | – | Optional. The address: lowercase ascii letters, digits and hyphens. Names that impersonate others are refused. |
| tagline | string | – | Optional. One line, what it does. |
| tags | array | – | Optional. Up to 8 words a searching person would type — situations, verbs, spelling variants. This is how the app is found. |
| url | string | – | Instead of html: fetch this page and serve a copy of it. |
No output schema declared.
No examples provided.
remove_app ~114
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.
| Name | Type | Req | Description |
|---|---|---|---|
| reason | string | yes | Why. This is published. |
| slug | string | yes | The app's address, without the domain. |
No output schema declared.
No examples provided.
search_apps ~177
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.
| Name | Type | Req | Description |
|---|---|---|---|
| q | string | – | Free text. Leave empty to list everything. |
| sort | string | – | 'new' (default) or 'open' (opened on the most days). |
No output schema declared.
No examples provided.
What is the win.postapp/library MCP server?
win.postapp/library is an MCP server listed in the public MCP registry as win.postapp/library. Publish one HTML file, get a live installable app URL. No account, no review, no queue. This page covers its hosted endpoint (https://postapp.win/mcp).
Is the win.postapp/library MCP server safe to use?
win.postapp/library scores 73 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the win.postapp/library MCP server expose?
win.postapp/library exposes 3 tools: publish_app, search_apps, remove_app. Their descriptions and schemas cost roughly 757 tokens of context every time the server is loaded.
Does the win.postapp/library MCP server require authentication?
No. We connected to win.postapp/library without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the win.postapp/library MCP server still maintained?
win.postapp/library is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.