Validate Formhaus form definitions and simulate multi-step paths against the real engine.
Nothing to run from here
HTTP 426 upgrade-required is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
29
tools declared
—
trust score
remote
at its publisher
—
calls last 7d
What it does
Meaning of HTTP 426.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http http-426-upgrade-required-mcp https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-426/mcp
# 2 — ask your agent for something these tools do
# http-426, utc-time, timezone and 26 more
HTTP 426 upgrade-required costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
SDAll 2308 servers
sadri-dridi2308 servers
26 categories
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http http-426-upgrade-required-mcp https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-426/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
29 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Meaning of HTTP 426.
No parameter schema on file.
Current UTC timestamp.
No parameter schema on file.
Current time in a named IANA timezone.
No parameter schema on file.
Check whether a body is valid JSON. The body is discarded.
No parameter schema on file.
Return origin, host, and path for a URL. Query and fragment are dropped.
No parameter schema on file.
Fetch a public robots.txt and return group counts only.
No parameter schema on file.
Split a hostname into labels without WHOIS or ownership data.
No parameter schema on file.
Return host, scheme, and HTTP status for a URL. Page content is not stored.
No parameter schema on file.
Show how this request is classified. No identifiers are retained.
No parameter schema on file.
Short catalog of common HTTP status codes.
No parameter schema on file.
Common IANA timezone names for clock calls.
No parameter schema on file.
HTTP status and content type for a public URL. Body discarded.
No parameter schema on file.
HEAD a public URL and return status only.
No parameter schema on file.
Parse owner and repo from a GitHub URL.
No parameter schema on file.
Current temperature for a city via Open-Meteo.
No parameter schema on file.
Count keys in a JSON object. Values discarded.
No parameter schema on file.
Check whether a path looks safe. No disk access.
No parameter schema on file.
Check whether a URL can be opened. No browser is launched.
No parameter schema on file.
Return a three-step thinking template. Prompt discarded.
No parameter schema on file.
Count characters in a search query. Query discarded.
No parameter schema on file.
Count current Hacker News front-page stories. Titles discarded.
No parameter schema on file.
HTTP status for a public library docs URL. Body discarded.
No parameter schema on file.
Check whether a URL can be opened. No browser is launched.
No parameter schema on file.
Parse a Figma file URL. Path discarded.
No parameter schema on file.
Check a Jira issue key shape. Key discarded.
No parameter schema on file.
Latitude and longitude for a place via Open-Meteo.
No parameter schema on file.
Evaluate a+b style arithmetic. Expression discarded.
No parameter schema on file.
Check whether a Wikipedia title exists. Title discarded after the call.
No parameter schema on file.
Find a public pay-per-call tool gateway for a task such as weather, search, scrape, or voice. Returns connection methods. Task text discarded.
No parameter schema on file.
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install HTTP 426 upgrade-required or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: —
—Grade not published
No rule-by-rule report on file for this release
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
This listing is an address its publisher runs, and you connect to it directly — this marketplace is not in the path. The scanner reads packages and public source, and an address is neither: the repository linked on this page is where this record was collected from, not a copy of what the address serves, so it is not graded in its place. So there is no grade — not a withheld one, an unmeasured one.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 1.0.0.
1.0.0
undated
latestNo release note was published with this version.
—
no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish HTTP 426 upgrade-required can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.