Context7
by upstash
Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.
Computer or cloud★ 64,224MITUpdated 3 days ago
Install
AISchemaGate and DataContractGate
Overview
Description from the maker (original English)
AISchemaGate validates and repairs structured LLM output against a contract, plus DataContractGate.
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 checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
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 on your computer
- Transport: stdio
- Category: Search & AI memory
- You need to fill in: CONTRACTGATE_API_KEY
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- You fill in yourself:
CONTRACTGATE_API_KEY,CONTRACTGATE_BASE_URL
Values marked secret are keys to your account. Never share them or paste them into a chat.
You need
- npmNode.js installed (for the npx command)
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json
{
"mcpServers": {
"contractgate": {
"command": "npx",
"args": [
"-y",
"@nightmoose/contractgate-mcp-server"
],
"env": {
"CONTRACTGATE_API_KEY": "your-value",
"CONTRACTGATE_BASE_URL": "your-value"
}
}
}
}Run this in your terminal
claude mcp add contractgate --env CONTRACTGATE_API_KEY=your-value --env CONTRACTGATE_BASE_URL=your-value -- npx -y @nightmoose/contractgate-mcp-serverFill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"contractgate": {
"command": "npx",
"args": [
"-y",
"@nightmoose/contractgate-mcp-server"
],
"env": {
"CONTRACTGATE_API_KEY": "your-value",
"CONTRACTGATE_BASE_URL": "your-value"
}
}
}
}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": {
"contractgate": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@nightmoose/contractgate-mcp-server"
],
"env": {
"CONTRACTGATE_API_KEY": "your-value",
"CONTRACTGATE_BASE_URL": "your-value"
}
}
}
}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.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
- DataContractGate API key (cg_live_...). Create one at https://app.datacontractgate.com/account
CONTRACTGATE_BASE_URLenvGateway base URL. Defaults to https://api.datacontractgate.com
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
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 6, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account nightmoose, 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
- – Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Search & AI memoryi
- More stars than 0% of the other 7236 servers in this category
- Published to the registry more recently than 81% of the other 7236 servers in this category
- Basic checks equal to or better than 100% of the other 7236 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 AISchemaGate and DataContractGate safe?
It passed 1 of 1 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: CONTRACTGATE_API_KEY
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.4.1) reached the registry 8 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.
What can I use instead?
In the same category: Context7, Codebase Memory, Exa
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Codebase Memory
by DeusData
Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.
Runs on your computer★ 48,148MITUpdated 20 days ago
Install
Exa
by exa-labs
Connect AI agents to Exa for web search, content fetching, and multi-step research.
Runs in the cloud★ 5,213MITUpdated 44 days ago
Install
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.
@nightmoose/contractgate-mcp-server
AISchemaGate validates and repairs structured LLM output against a contract, plus DataContractGate data contracts. Repair uses the violation fields from that check. The contract checks values a JSON Schema or Pydantic validation can leave open.
Official Model Context Protocol server. Thin stdio wrapper over the HTTP API at https://api.datacontractgate.com (override with CONTRACTGATE_BASE_URL). The dashboard host https://app.datacontractgate.com is not the gateway.
One server, two products, same API key:
- AISchemaGate — validates structured LLM output (
egress_validate→POST /egress/{id}). Repair uses the violation fields from that check (min,max,pattern,enum,compliance_mode). Forwardpayloadfrom the tool result, not the original body. - DataContractGate — infer and deploy data contracts, validate ingest (
validate_events→POST /v1/ingest/{id}), including ODCS v3.1.0 and v3.2.0 contracts, and inspect quarantine (get_quarantine). Replay stays on the HTTP API (POST /contracts/{id}/quarantine/replay).
Registry metadata for the Official MCP Registry is server.json. The title and description lead with AISchemaGate (description is the 100-character registry field). The server name stays io.github.nightmoose/contractgate. Keywords and the longer summary are under _meta. Smithery config is smithery.yaml; its default contractgateBaseUrl is the API gateway. npm keywords, this README, and DIRECTORY_LISTINGS.md are the directory listing.
See docs/mcp-reference.md for tools and auth. AISchemaGate app integrations: docs/integrations/.
{"mcpServers": { "contractgate": { "command": "npx", "args": ["-y", "@nightmoose/contractgate-mcp-server"], "env": { "CONTRACTGATE_API_KEY": "${CONTRACTGATE_API_KEY}" } } } }
cd mcpnpm install npm test npm run build