{
  "title": "Representative MCP Host Support — Vendor-Documented Snapshot",
  "schemaVersion": "1.0",
  "checkedAt": "2026-08-25",
  "verificationMethod": "First-party documentation review; not independent interoperability testing.",
  "coverageNote": "Representative, not exhaustive. Product plan, surface, rollout, release, and protocol compatibility can vary.",
  "count": 4,
  "records": [
    {
      "organization": "Anthropic",
      "product": "Claude",
      "surface": "Claude custom connectors; separate Claude Desktop local path",
      "role": "Host application containing MCP client behavior",
      "localPath": "Separate product path — local MCP is configured in Claude Desktop, not through the cloud custom-connector path.",
      "remotePath": "Direct — custom remote connectors connect from Anthropic infrastructure to a reachable endpoint.",
      "documentedCapabilities": "Custom remote MCP connectors across supported Claude surfaces; local extensions and configuration are documented separately.",
      "limitations": "Plan, surface, connector-count, organization-owner, and network allow-list requirements vary. Cowork and claude.ai do not use the local Desktop path.",
      "transportNotes": "Remote endpoints must be reachable from Anthropic infrastructure; this review did not test protocol-version interoperability.",
      "checkedAt": "2026-08-25",
      "verificationMethod": "First-party documentation review; not an independent interoperability test.",
      "sourceIds": [
        "S145",
        "S146"
      ],
      "sourceUrls": [
        "https://support.claude.com/en/articles/11175166-get-started-with-custom-connectors-using-remote-mcp",
        "https://support.claude.com/en/articles/11176164-use-connectors-to-extend-claude-s-capabilities"
      ],
      "durability": "LIVE-CHECK REQUIRED"
    },
    {
      "organization": "OpenAI",
      "product": "ChatGPT",
      "surface": "Developer mode and MCP apps on supported ChatGPT web plans",
      "role": "Host application containing MCP client behavior",
      "localPath": "Via Secure MCP Tunnel — ChatGPT does not connect directly to a local server.",
      "remotePath": "Direct — remote MCP apps and connectors are supported on eligible surfaces.",
      "documentedCapabilities": "Read/fetch behavior and, for eligible beta plans, full MCP actions through developer mode and apps.",
      "limitations": "Full/write MCP is a web beta for Business, Enterprise, and Edu; Pro is documented for read/fetch. Agent mode does not use custom apps, Deep Research is read/fetch only, and MCP apps are not available on mobile.",
      "transportNotes": "Private, on-premises, or developer-machine servers require the supported tunnel; this review did not test protocol-version interoperability.",
      "checkedAt": "2026-08-25",
      "verificationMethod": "First-party documentation review; not an independent interoperability test.",
      "sourceIds": [
        "S140"
      ],
      "sourceUrls": [
        "https://help.openai.com/en/articles/12584461-developer-mode-and-full-mcp-connectors-in-chatgpt"
      ],
      "durability": "LIVE-CHECK REQUIRED"
    },
    {
      "organization": "Microsoft",
      "product": "Visual Studio Code",
      "surface": "VS Code agent features",
      "role": "Host application containing MCP client behavior",
      "localPath": "Direct — local stdio servers are supported.",
      "remotePath": "Direct — remote HTTP servers are supported.",
      "documentedCapabilities": "Tools, resources, prompts, MCP Apps, trust controls, enterprise policy, and local sandboxing on supported systems.",
      "limitations": "The documented sandbox applies only to locally running stdio servers on macOS and Linux, not Windows. Sandboxed server tool calls are auto-approved; availability also varies by release and organization policy.",
      "transportNotes": "Remote HTTP attempts Streamable HTTP and may fall back to SSE compatibility; this review did not test protocol-version interoperability.",
      "checkedAt": "2026-08-25",
      "verificationMethod": "First-party documentation review; not an independent interoperability test.",
      "sourceIds": [
        "S141",
        "S143"
      ],
      "sourceUrls": [
        "https://code.visualstudio.com/docs/agent-customization/mcp-servers",
        "https://code.visualstudio.com/blogs/2026/01/26/mcp-apps-support"
      ],
      "durability": "LIVE-CHECK REQUIRED"
    },
    {
      "organization": "Google",
      "product": "Gemini CLI",
      "surface": "Gemini CLI MCP configuration",
      "role": "Host application containing MCP client behavior",
      "localPath": "Direct — stdio servers are supported.",
      "remotePath": "Direct — Streamable HTTP is supported; an SSE endpoint remains configurable for compatibility.",
      "documentedCapabilities": "Tools, resources, prompts, OAuth, include/exclude filtering, confirmation, and trusted-server configuration.",
      "limitations": "Trust configuration bypasses confirmations. OAuth browser and localhost-callback behavior needs special handling in headless, SSH, and container environments. Apps and Tasks support was not inferred.",
      "transportNotes": "SSE configuration is compatibility behavior, not a statement that HTTP+SSE is the current core transport; protocol-version interoperability was not tested.",
      "checkedAt": "2026-08-25",
      "verificationMethod": "First-party documentation review; not an independent interoperability test.",
      "sourceIds": [
        "S144"
      ],
      "sourceUrls": [
        "https://geminicli.com/docs/tools/mcp-server/"
      ],
      "durability": "LIVE-CHECK REQUIRED"
    }
  ]
}