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404-directory

v0.9.3

Agent Discovery + Trust: search, verify, and trust tools before calling them — plus webpage understanding and deployment verification.

CodexClaude Code1 Skill1 MCP serverStreamable HTTP

By 404.directoryLicense: MIT1 GitHub starsUpdated last month

Directory evidence

Runtimes
Codex and Claude Code
Parsed components
2 skill or MCP entries
Source updated
Aug 24, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install 404-directory for Codex and Claude Code

Installs for the current user
claude plugin marketplace add IchenDEV/agent-plugin-mkt
claude plugin marketplace update agent-plugin-marketplace
claude plugin install 404-directory-2@agent-plugin-marketplace

Paste and run these commands in a terminal with Claude Code. They add and refresh the PluginsMP catalog, then install this plugin.

Compatibility: the page URL and API slug “404-directory-2” remain stable.

  • Codex: Legacy selector 404-directory-2@agent-plugin-marketplace remains documented for migration; install from source for this runtime.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Codex has another source with the same manifest name. This directory does not invent numbered install aliases; use the publisher's catalog or inspect the source manually for that runtime.

Get the source manually
git clone https://github.com/MM-sheng/404-directory

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is distribution/404-directory/.

Plugin files

distribution/404-directory/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── skills/use-404-directory/SKILL.md
└── .mcp.json

Included Skills1

use-404-directoryskills/use-404-directory/SKILL.md

Use the public 404.directory MCP server as a risk preflight before installing or invoking third-party Agent tools, and to search official documentation, verify deployments, understand webpages, or discover MCP tools. Trigger whenever an Agent is about to use an unfamiliar external tool or needs evidence-backed technical verification.

MCP servers1

404-directoryStreamable HTTP
url
https://404.directory/mcp

Plugin manifests2

distribution/404-directory/.codex-plugin/plugin.json
{
  "name": "404-directory",
  "version": "0.9.3",
  "description": "Agent Discovery + Trust: search, verify, and trust tools before calling them — plus webpage understanding and deployment verification.",
  "author": {
    "name": "404.directory",
    "url": "https://404.directory"
  },
  "homepage": "https://404.directory/docs",
  "keywords": [
    "agents",
    "mcp",
    "discovery",
    "trust",
    "verification",
    "evidence"
  ],
  "mcpServers": "./.mcp.json",
  "interface": {
    "displayName": "404.directory",
    "shortDescription": "Discovery + Trust infrastructure for agent tools",
    "longDescription": "Discover and trust ecosystem tools via search_tools / get_trust_score / recommend_tools, and use read-only verify_web / understand_webpage for public web checks.",
    "developerName": "404.directory",
    "category": "Developer Tools",
    "capabilities": [
      "Read"
    ],
    "websiteURL": "https://404.directory",
    "privacyPolicyURL": "https://404.directory/privacy",
    "termsOfServiceURL": "https://404.directory/terms",
    "defaultPrompt": [
      "Search 404 for tools that can verify a public deployment.",
      "Compare trust profiles for two candidate MCP tools.",
      "Verify that my latest website deployment is really live."
    ],
    "brandColor": "#C8F542"
  }
}
distribution/404-directory/.claude-plugin/plugin.json
{
  "name": "404-directory",
  "displayName": "404.directory",
  "version": "0.9.3",
  "description": "Search official AI and cloud documentation, verify public deployments, and discover trusted read-only MCP tools.",
  "author": {
    "name": "404.directory",
    "url": "https://404.directory"
  },
  "homepage": "https://404.directory/docs",
  "repository": "https://github.com/MM-sheng/404-directory",
  "license": "MIT",
  "keywords": [
    "agent-tools",
    "mcp",
    "official-documentation",
    "tool-discovery",
    "web-verification"
  ],
  "mcpServers": "./.claude-plugin/mcp.json"
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[404-directory on Agent Plugins Marketplace](https://pluginsmp.com/plugins/404-directory-2)