The 16 hex chars MCP server,
connected in one click.
16 hex chars. Connect the official 16 hex chars MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add 16 hex chars to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http 16-hex-chars https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/hex-16/mcpRun in your terminal, then restart Claude Code.
16 hex chars · https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/hex-16/mcp
What your AI can do with 16 hex chars
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “hex-16”: 16 hex chars.”
“Use “utc-time”: Current UTC timestamp.”
“Use “timezone”: Current time in a named IANA timezone.”
“Use “validate-json”: Check whether a body is valid JSON. The body is discarded.”
How secure is the 16 hex chars MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how 16 hex chars holds up.
Official endpoint
Operated by 16 hex chars (workers.dev) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If 16 hex chars adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick 16 hex chars
Choose 16 hex chars in the gate directory. No sign-in needed.
Use it anywhere
16 hex chars's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools 16 hex chars exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
hex-16 — 16 hex chars
utc-time — Current UTC timestamp.
timezone — Current time in a named IANA timezone.
validate-json — Check whether a body is valid JSON. The body is discarded.
normalize-url — Return origin, host, and path for a URL. Query and fragment are dropped.
inspect-robots — Fetch a public robots.txt and return group counts only.
domain-shape — Split a hostname into labels without WHOIS or ownership data.
citation — Return host, scheme, and HTTP status for a URL. Page content is not stored.
+ 22 more tools once connected
Who runs the 16 hex chars MCP server?
The 16 hex chars MCP server at a glance
https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/hex-16/mcpQuestions, answered
Is there an official 16 hex chars MCP server?
Yes — 16 hex chars operates its own remote MCP server at agent-observatory-sensor.nolimit-observatory.workers.dev. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect 16 hex chars to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick 16 hex chars in the directory. No account or sign-in is needed. From then on, 16 hex chars's tools are available in every client you've connected to gate.
Do I need to host anything?
No. 16 hex chars runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the 16 hex chars MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect 16 hex chars in minutes. No credit card required.
Connect more than just 16 hex chars
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up 16 hex chars in: Claude · Claude Code · ChatGPT · Cursor · VS Code