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MCPSTAMP
MCP server report

Chrome Extension Downloader MCP server

com.extensiondownloader/mcp

We checked this server on 2 November 2026 with McpStamp Check engine 1.2.0. It scored 76 of 100 (grade C), higher than 21.8% of the 33,003 registry servers that responded over HTTPS that day. Ready for MCP Registry. Not ready for Claude, ChatGPT and Gemini.

Measured facts

Score
76C
Sign-in
API key or other
Tools listed
16
Protocol version
2025-11-25
Stores

Store readiness

StoreStatusReason
Claude Connectors Directory Not ready Blocked by Human-readable title on every tool.
ChatGPT app directory Not ready Blocked by Sign-in method the store supports (OAuth or none), Protected resource metadata (RFC 9728), Authorization server metadata (RFC 8414 / OIDC) and Human-readable title on every tool.
Gemini Connected Apps Not ready Blocked by Sign-in method the store supports (OAuth or none) and Authorization server metadata (RFC 8414 / OIDC).
Official MCP Registry Ready No blocking check failed.

MCP Registry ready means a valid public remote for the registry, not that the server is listed in a store.

Fixes

6 checks to fix

  1. Fails

    Protected resource metadata (RFC 9728)

    auth_prm

    Blocks ChatGPT.

    Measured Not found: https://extensiondownloader.com/.well-known/oauth-protected-resource/api/mcp -> 404; https://extensiondownloader.com/.well-known/oauth-protected-reso

    Serve RFC 9728 metadata at /.well-known/oauth-protected-resource (plus the path-suffixed form) with "resource" and "authorization_servers".

  2. Fails

    Authorization server metadata (RFC 8414 / OIDC)

    auth_as_metadata

    Blocks ChatGPT and Gemini.

    Measured Not found: https://extensiondownloader.com/.well-known/oauth-authorization-server -> 404; https://extensiondownloader.com/.well-known/openid-configuration -> 40

    Serve RFC 8414 metadata at <issuer>/.well-known/oauth-authorization-server with authorization_endpoint, token_endpoint and response_types_supported ["code"].

  3. Fails

    Sign-in method the store supports (OAuth or none)

    auth_method

    Blocks ChatGPT and Gemini.

    Measured unknown method: HTTP 401 and no working OAuth discovery: the server asks for a Bearer token but its OAuth metadata could not be found

    ChatGPT and Gemini cannot send a static API key or token: add MCP OAuth (protected resource metadata and authorization server metadata), or serve the tools without auth. Claude accepts a static credential in a request header only in a beta

  4. Fails

    Human-readable title on every tool

    tool_titles

    Blocks Claude and ChatGPT.

    Measured 16/16 without title: extension_search, extension_get, extension_trends, extension_rank_history, extension_safety and 11 more

    Add a short human-readable "title" to every tool (shown in store UIs and consent screens).

  5. Warning

    401 carries WWW-Authenticate resource_metadata

    auth_challenge

    Measured unknown method: WWW-Authenticate bearer without resource_metadata

    Add resource_metadata="https://<host>/.well-known/oauth-protected-resource<path>" to the WWW-Authenticate: Bearer header on 401.

  6. Warning

    JSON-RPC error for unknown method

    jsonrpc_errors

    Measured HTTP 401 instead of a JSON-RPC error

    Route the method first and answer unknown methods with JSON-RPC error -32601 before the auth check, or return a JSON-RPC error body with the 401.

15 checks passed, 6 did not run

Passed. Served over HTTPS, initialize over Streamable HTTP, Supported protocol version negotiated, JSON or SSE response Content-Type, GET answers SSE or 405, initialize latency, serverInfo name and version, Server instructions, tools capability declared, tools/list returns tools, inputSchema is an object schema, Tool names are valid and portable, readOnlyHint or destructiveHint on every tool, Explicit readOnlyHint, destructiveHint and openWorldHint (ChatGPT), Tool descriptions.

Not run. Resource metadata "resource" equals the server URL, First metadata URL Gemini tries answers 200 with the required fields, issuer equals the authorization_servers entry; token_endpoint_auth_methods_supported (ChatGPT), PKCE S256 advertised, Client registration (DCR or Client ID Metadata Documents), refresh_token grant advertised. These need an OAuth sign-in flow the check could not reach.

Run a fresh check

This page is the 2 November 2026 snapshot. If you maintain this server and have shipped fixes since then, re-check it. The live check and the badge show the current result, and the next snapshot will pick up the change.

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McpStamp score for Chrome Extension Downloader

Markdown

[![McpStamp score](https://www.mcpstamp.com/badge?url=https%3A%2F%2Fextensiondownloader.com%2Fapi%2Fmcp)](https://www.mcpstamp.com/r/com-extensiondownloader-mcp/)

HTML

<a href="https://www.mcpstamp.com/r/com-extensiondownloader-mcp/"><img src="https://www.mcpstamp.com/badge?url=https%3A%2F%2Fextensiondownloader.com%2Fapi%2Fmcp" alt="McpStamp score" height="20"></a>
Registry entry

About this server

Chrome extension data: free previews; API key for full reviews, comparisons and permissions.
Registry name
com.extensiondownloader/mcp
Remote URL
https://extensiondownloader.com/api/mcp
Version
1.0.2
Website
extensiondownloader.com/mcp
Checked
2 November 2026, engine 1.2.0, no credentials

The description above is the server's own text from the official MCP Registry. If a result looks wrong, run a fresh check and email support@zovo.one with the report link.

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