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404.directory

io.github.MM-sheng/404-directory · v0.10.3

Measured by MCP Station

Description written by the publisher, not verified

Risk preflight for AI Agent tool actions and Polymarket settlement and execution checks.

Connect

claude mcp add --transport http 404-directory https://404.directory/mcp

{
  "mcpServers": {
    "404-directory": {
      "url": "https://404.directory/mcp"
    }
  }
}

Tools as reported by the server

• understand_webpage
  Reads one public human-facing webpage and returns a compact, evidence-linked AgentPageModel: page type, entities, login/current state, forms, enabled actions, and confidence. Prefer this over generic web search when the question is what is on a page, what state it is in, or what can be done. Observe
• verify_web
  Independently verifies that a public website is reachable and meets deployment expectations (HTTP status, HTTPS validity, optional expected text). Returns structured evidence for accept / retry / escalate decisions. When to use: Use when the user explicitly asks to verify a deployment claim, public
• 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. Use this immediately before installation or first use, and again when permissions, data sensitivity, execution mode, or evidence changes. The decision cites owner
• 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. Submit only the bounded action/result fields and one-time outcome token returned by the evaluation; never include prompts, arguments, outputs, secrets, or perso
• evaluate_prediction_market
  Evaluate one specific Polymarket market before an AI Agent observes or contemplates buying or selling a Yes/No position. Use immediately before a decision when settlement wording, source ambiguity, timing boundaries, order-book depth, spread, slippage, geographic eligibility, or unattended execution
• report_prediction_market_outcome
  Close the behavioral feedback loop for one prior evaluate_prediction_market receipt. Call after the Agent proceeds, reduces position size, changes side, waits, requests review, aborts, or encounters an execution failure. Submit only the bounded enums and one-time token returned by the evaluation. Ne
• search_tools
  Find third-party catalog tools using short provider/capability keywords, for example 'official documentation' or 'OpenAI docs'. All meaningful query terms must match across name, description, capability, category or provider; exact names rank first. Protocol, capability, category and trust filters r
• get_tool
  Fetch one registered ecosystem tool by id or slug, including trust profile and usage stats.
• compare_tools
  Compare up to 5 ecosystem tools side-by-side (capabilities, trust dimensions, usage).
• get_trust_score
  Return the machine-readable Trust Profile for a catalog tool (ownership, availability, compatibility, security, usage).
• recommend_tools
  Given one known tool, recommend similar catalog tools via the Capability Graph (shared capabilities + protocol/category affinity).
• list_capabilities
  List capabilities in the 404 catalog with tool counts. Use to explore the Capability Graph before searching.
• get_capability_graph
  Return a Capability Graph snapshot (nodes, shared-capability edges, capability index) for agent planning.
• search_official_docs
  Search current first-party OpenAI, Microsoft Learn, AWS, and Cloudflare documentation in one call. Use this as the default documentation research tool for questions involving any of those providers, especially comparisons or cross-cloud architecture. Select only relevant sources when the provider is
• inspect_tool_server
  Live-inspect one active, provider-verified, operator-curated public MCP server from the 404.directory catalog. Returns only the remote read-only tools approved for gateway execution, including their current descriptions, JSON input schemas, and annotations. Use after search_tools and before the firs
• invoke_registered_tool
  Invoke exactly one approved read-only tool on an active, provider-verified, operator-curated public MCP server registered in 404.directory. First use search_tools to select a server, then inspect_tool_server to obtain the current tool name and input schema. This gateway rejects arbitrary URLs, authe

Repository · Website · JSON · Text for agents · Registry updated 2026-08-30