The 404.directory MCP server,
connected in one click.
Risk preflight for AI Agent tool actions and Polymarket settlement and execution checks. Connect the official 404.directory 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
What your AI can do with 404.directory
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “understand_webpage”: Reads one public human-facing webpage and returns a compact, evidence-linked AgentPageModel: page type, entities, login/current state, forms.”
“Use “verify_web”: Independently verifies that a public website is reachable and meets deployment expectations (HTTP status, HTTPS validity, optional expected.”
“Use “evaluate_tool_risk”: Make a contextual allow, review, or block decision before an AI Agent installs or invokes a third-party tool registered in 404.directory. Us.”
“Use “report_tool_outcome”: Close the feedback loop for one prior evaluate_tool_risk receipt. Call after the Agent proceeds, changes tools, requests review, or aborts.”
How secure is the 404.directory MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how 404.directory holds up.
Official endpoint
Operated by 404.directory (404.directory) 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 404.directory 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 404.directory
Choose 404.directory in the gate directory. No sign-in needed.
Use it anywhere
404.directory'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 404.directory exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
understand_webpage — Reads one public human-facing webpage and returns a compact, evidence-linked AgentPageModel: page type, entities, login/current state, forms
verify_web — Independently verifies that a public website is reachable and meets deployment expectations (HTTP status, HTTPS validity, optional expected
evaluate_tool_risk — Make a contextual allow, review, or block decision before an AI Agent installs or invokes a third-party tool registered in 404.directory. Us
report_tool_outcome — Close the feedback loop for one prior evaluate_tool_risk receipt. Call after the Agent proceeds, changes tools, requests review, or aborts.
evaluate_prediction_market — Evaluate one specific Polymarket market before an AI Agent observes or contemplates buying or selling a Yes/No position. Use immediately bef
report_prediction_market_outcome — Close the behavioral feedback loop for one prior evaluate_prediction_market receipt. Call after the Agent proceeds, reduces position size, c
search_tools — Find third-party catalog tools using short provider/capability keywords, for example 'official documentation' or 'OpenAI docs'. All meaningf
get_tool — Fetch one registered ecosystem tool by id or slug, including trust profile and usage stats.
+ 8 more tools once connected
The 404.directory MCP server at a glance
https://404.directory/mcpQuestions, answered
Is there an official 404.directory MCP server?
Yes — 404.directory operates its own remote MCP server at 404.directory. 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 404.directory to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick 404.directory in the directory. No account or sign-in is needed. From then on, 404.directory's tools are available in every client you've connected to gate.
Do I need to host anything?
No. 404.directory runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the 404.directory 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 404.directory in minutes. No credit card required.
Connect more than just 404.directory
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up 404.directory in: Claude · Claude Code · ChatGPT · Cursor · VS Code