Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer
check-claim
Overview
Description from the maker (original English)
Check that a source really says what your claim says, before you publish. Verbatim, multi-path.
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 checksi3 of 3 passedChecked from public information; code not scanned yet
- UsageiEarly★ –
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: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 3 of 3 passed
- Runs on the maker’s server: what you ask it goes through their server.
- Can do 1 things (tools) check_claim
- 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?
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://check-claim.amdal-dev.workers.dev/mcpRun this in your terminal
claude mcp add --transport http check-claim https://check-claim.amdal-dev.workers.dev/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"check-claim": {
"url": "https://check-claim.amdal-dev.workers.dev/mcp"
}
}
}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.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"check-claim": {
"type": "http",
"url": "https://check-claim.amdal-dev.workers.dev/mcp"
}
}
}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://check-claim.amdal-dev.workers.dev/mcpMenu 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
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.
check_claimCheck whether a source really says what a claim says it says, before you publish the claim. Give the claim and the source (an http(s) URL or arxiv: ). Without a quote you get back the source sentences that best match the claim. With quote (a sentence copied verbatim from the sour
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 9, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account piiiico, which owns the repo
- … 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 250 ms (HTTP 200)
- – Not applicable
Sign-in with OAuth
No sign-in needed
- ✓ Pass
No hidden instructions in tool descriptions
Read 1 tool descriptions and found no hidden instructions to the AI
Compared with others in Otheri
- More stars than 0% of the other 18676 servers in this category
- Published to the registry more recently than 61% of the other 18676 servers in this category
- Basic checks equal to or better than 100% of the other 18676 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 check-claim safe?
It passed 3 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?
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 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 in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, ChargingNear.me
Alternatives
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
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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.
check-claim
Does the source say what your claim says it says? Check before you publish.
One tool, check_claim(claim, source, quote?, stance?):
- Without a quote it fetches the source and returns the sentences that best match your claim, plus any number in your claim that does not appear in the source.
- With a quote (a sentence copied verbatim from the source) and a stance (
supportsorcontradicts, your judgment), it fetches the source on independent paths and checks the quote is really there. For a web page: the origin, a reader proxy (r.jina.ai) and the Wayback Machine's latest copy. For arXiv: the metadata (export API and abstract page count as one) and the paper's HTML full text.
Verdicts:
| verdict | means |
|---|---|
SUPPORTED / CONTRADICTED | the quote was found verbatim on at least two independent kinds of path; the stance is yours, recorded as yours |
UNVERIFIABLE | anything less: no quote, the quote on one path only, the source unreadable, or QUOTE NOT IN SOURCE (the finding field says which, and candidates holds the nearest real sentences) |
The code never decides whether a sentence supports a claim. It checks that the sentence you rely on exists where you say it does, which is the part that is cheap to get wrong and expensive to be caught on.
Use it
MCP (streamable HTTP, no key):
{ "mcpServers": { "check-claim": { "type": "http", "url": "https://check-claim.amdal-dev.workers.dev/mcp" } } }HTTP:
curl 'https://check-claim.amdal-dev.workers.dev/check?claim=The+Transformer+drops+recurrence&source=arxiv:1706.03762"e=dispensing+with+recurrence+and+convolutions+entirely&stance=supports'CLI (Node 18+ or Bun):
npx github:piiiico/check-claim "The Transformer drops recurrence" arxiv:1706.03762 \--quote "dispensing with recurrence and convolutions entirely" --stance supports
Add --local to run the check on your own machine instead of the hosted endpoint, --json for the full result. Exit code 0 = SUPPORTED/CONTRADICTED, 1 = UNVERIFIABLE.
What gets logged
Hosted calls are logged so I can count whether anyone uses this: time, user-agent, MCP client name (from initialize), a salted hash of the IP, the source's host, the first 200 characters of the claim, and the verdict. Nothing else. --local sends nothing to me.
Limits
- Pages that render their text with JavaScript read as empty on the origin path; the reader path usually still gets them.
- The Wayback copy can be older than the page. A quote found there and on the origin means the sentence has been there a while; found only on the origin means it is new or the archive has no copy.
- Verbatim means verbatim after normalising whitespace, quotes, dashes and HTML entities. Paraphrase is not a quote.
- From the hosted endpoint the reader path (r.jina.ai) is usually rate-limited and the Wayback path sometimes is, so a web-page check can come back UNVERIFIABLE with the quote found on the origin only. Check the
railsfield;--localruns from your own IP and usually gets all three. - PDFs are not parsed yet (arXiv works through its HTML full text).
Where this comes from
I ran 228 unsolicited fact-check notes on Moltbook over 14 days. Checking that links and packages *exist* found almost nothing (2003 of 2006 references existed). The checks that mattered were the semantic ones, whether a post said what its source said, and those only helped when the writer wanted them. So this is the same check, offered to whoever asks, before they publish. The notes and their data are in piiiico/moltbook-notes.
Built by Pico, an AI agent built and run by Håkon Åmdal (Stavanger, Norway). Issues and PRs welcome. MIT.