Chrome Extension Downloader

com.extensiondownloader/mcpextensiondownloader.comstreamable-httpv1.0.2Scanned 1 hour ago

Chrome extension data: free previews; API key for full reviews, comparisons and permissions.

16 tools: 1 change things and 15 only read.

Reads private data · 1
Reads text others write · 6
Can send data out · 0
No findings

Sign-in required, no OAuth metadata. Remote posture

Anlyon alternative

1 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

16 tools

Changes things 1Creates or changes something that can be changed back.Claude Code: ask

extension_rank_historyTrack one extension's position in our overall and category user-count rankings.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Track one extension's position in our overall and category user-count rankings. Returns per-scope history, not official store or keyword search positions. Untracked ranks may be missing.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 15Looks things up and changes nothing.Show 15 read-only tools

extension_api_usageRead the current API key's daily REST/MCP usage and remaining key/account allowance.No findings
Why it is in this group
- The description's first verb is "read": a word for reading.
Description, as the server wrote it
Read the current API key's daily REST/MCP usage and remaining key/account allowance. Requires a key, but remains available after its daily data quota is exhausted. Does not debit data quota; account minute limits still apply.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_compareCompare up to four extensions side by side: users, stars, rating counts, versions, permissions and recent permission changes.No findings
Why it is in this group
- The name "extension_compare" says "compare": a word for reading.
Description, as the server wrote it
Compare up to four extensions side by side: users, stars, rating counts, versions, permissions and recent permission changes. For historical comparisons, call extension_trends for each ID; this is not code-similarity detection.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_getGet collected store metadata for one extension, including users, ratings and version.No findings
Why it is in this group
- The name "extension_get" says "get": a word for reading.
Description, as the server wrote it
Get collected store metadata for one extension, including users, ratings and version. Free without a key for basic metadata only; a key returns the full metadata record. Unknown IDs return not found, never trigger a crawl.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_rankingsRead our saved user-count leaderboard for one date, overall or within a category.No findings
Why it is in this group
- The description's first verb is "read": a word for reading.
Description, as the server wrote it
Read our saved user-count leaderboard for one date, overall or within a category. Returns positions and pagination; not official store or keyword search ranks. Use extension_rank_history to follow one extension over time.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_review_historyRead collected review counts grouped by original publication date and stars, plus version-level ratings and undated/unrated counts.Reads text others writeNo findings
Why it is in this group
- The description's first verb is "read": a word for reading.
What it can reach
- untrusted-inputThe name "extension_review_history" says "review": it reads comments, which other people can write.
- untrusted-inputThe description's first sentence says "read" and "review": it reads comments, which other people can write.
Description, as the server wrote it
Read collected review counts grouped by original publication date and stars, plus version-level ratings and undated/unrated counts. Reconstructed from retained reviews, not historical store rating-count snapshots.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_review_insightsRead stored review statistics and star distribution for an extension, optionally by review language.Reads text others writeNo findings
Why it is in this group
- The description's first verb is "read": a word for reading.
What it can reach
- untrusted-inputThe name "extension_review_insights" says "review": it reads comments, which other people can write.
- untrusted-inputThe description's first sentence says "read" and "review": it reads comments, which other people can write.
Description, as the server wrote it
Read stored review statistics and star distribution for an extension, optionally by review language. These describe collected reviews, not all store ratings. Missing statistics return null; no refresh is triggered.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_review_summaryGet an existing published AI summary of collected reviews, with pros and cons.Reads text others writeNo findings
Why it is in this group
- The description's first verb is "get": a word for reading.
What it can reach
- untrusted-inputThe name "extension_review_summary" says "review": it reads comments, which other people can write.
- untrusted-inputThe description's first sentence says "get" and "review": it reads comments, which other people can write.
Description, as the server wrote it
Get an existing published AI summary of collected reviews, with pros and cons. Use extension_reviews for original comments. Returns null when unavailable and English when a translation is missing; never calls a model or generates a new summary.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_reviewsRead original stored reviews for one extension, with text, star and language filters combined using AND.Reads text others writeNo findings
Why it is in this group
- The description's first verb is "read": a word for reading.
What it can reach
- untrusted-inputThe name "extension_reviews" says "review": it reads comments, which other people can write.
- untrusted-inputThe description's first sentence says "read" and "review": it reads comments, which other people can write.
Description, as the server wrote it
Read original stored reviews for one extension, with text, star and language filters combined using AND. Returns reviews and pagination. For cross-extension or OR queries, use extension_reviews_search.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_reviews_searchSearch original stored reviews across extensions with AND/OR field filters.Reads text others writeNo findings
Why it is in this group
- The name "extension_reviews_search" says "search": a word for reading.
What it can reach
- untrusted-inputThe name "extension_reviews_search" says "search" and "review": it reads comments, which other people can write.
- untrusted-inputThe description's first sentence says "search" and "review": it reads comments, which other people can write.
Description, as the server wrote it
Search original stored reviews across extensions with AND/OR field filters. Returns reviews and pagination. Example filter: {"field":"body","operator":"contains","value":"subscription"}. Use extensionEid to narrow to an extension.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_safetyInspect permission capabilities, observed permission changes and heuristic store risk signals.No findings
Why it is in this group
- The description's first verb is "inspect": a word for reading.
Description, as the server wrote it
Inspect permission capabilities, observed permission changes and heuristic store risk signals. Reports evidence and incomplete assessments; not a malware scan, malware probability or safety guarantee.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_searchFind extensions by name, description or category name.No findings
Why it is in this group
- The name "extension_search" says "search": a word for reading.
Description, as the server wrote it
Find extensions by name, description or category name. Returns metadata and pagination, ordered by user count. Use returned IDs for detail and analysis tools; not Chrome Web Store keyword search positions.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_source_searchFind extensions by Manifest metadata, permission names, host patterns, descriptions or archived source file paths.Reads private dataNo findings
Why it is in this group
- The name "extension_source_search" says "search": a word for reading.
What it can reach
- private-dataThe description's first sentence says "find" and "file": it reads files.
Description, as the server wrote it
Find extensions by Manifest metadata, permission names, host patterns, descriptions or archived source file paths. Returns metadata matches and snippets, not full-text JavaScript search, source downloads or code-similarity analysis.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_topBrowse extensions ranked by current users, average stars or store rating count.Reads text others writeNo findings
Why it is in this group
- The description's first verb is "browse": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "browse": it reads web pages, which anyone can write.
Description, as the server wrote it
Browse extensions ranked by current users, average stars or store rating count. Free without a key for the first 10 by users only; omit arguments for that preview. Other sorts and pagination require a key.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_trendingFind growing extensions using saved 7/14/30/90-day user or rating-count growth rankings.No findings
Why it is in this group
- The description's first verb is "find": a word for reading.
Description, as the server wrote it
Find growing extensions using saved 7/14/30/90-day user or rating-count growth rankings. Candidates have 1K-1M users and at least 500 net new users in the window. Free without a key for the first 10 by 30-day user gain; omit arguments for that preview. Missing comparison data is not zero growth; requests never rebuild rankings.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
extension_trendsRead one extension's user-count, store rating-count and average-star history with current metrics and deltas.No findings
Why it is in this group
- The description's first verb is "read": a word for reading.
Description, as the server wrote it
Read one extension's user-count, store rating-count and average-star history with current metrics and deltas. Use for time-series analysis, not keyword ranks. Missing days are not zero values.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged outbound.

Reads private data1: Reads files, mail, messages, databases, secrets, calendars or repositories.; extension_source_search
Reads text others write6: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; extension_review_history
extension_review_insights
extension_review_summary
extension_reviews
extension_reviews_search
extension_top
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Sign-in required, no OAuth metadata

Looked at Oct 31, 2026, 23:18 UTC, unchanged since Oct 31, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 401
tools/list served without credentials: no
Tools that change things, listed without credentials: 0
Protocol version: not observed
WWW-Authenticate on 401: no
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint asks for credentials (HTTP 401) but publishes no RFC 9728 protected resource metadata: no resource_metadata in WWW-Authenticate and no document at /.well-known/oauth-protected-resource.
Matched text
https://extensiondownloader.com/api/mcp: initialize answered HTTP 401, without a WWW-Authenticate header
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.0.2. Values in angle brackets are yours to fill in.

claude mcp add --transport http extensiondownloader https://extensiondownloader.com/api/mcp

claude mcp add --transport http extensiondownloader https://extensiondownloader.com/api/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__extensiondownloader__extension_search",
      "mcp__extensiondownloader__extension_get",
      "mcp__extensiondownloader__extension_trends",
      "mcp__extensiondownloader__extension_safety",
      "mcp__extensiondownloader__extension_compare",
      "mcp__extensiondownloader__extension_top",
      "mcp__extensiondownloader__extension_trending",
      "mcp__extensiondownloader__extension_rankings",
      "mcp__extensiondownloader__extension_review_summary",
      "mcp__extensiondownloader__extension_review_insights",
      "mcp__extensiondownloader__extension_review_history",
      "mcp__extensiondownloader__extension_reviews",
      "mcp__extensiondownloader__extension_reviews_search",
      "mcp__extensiondownloader__extension_source_search",
      "mcp__extensiondownloader__extension_api_usage"
    ],
    "ask": [
      "mcp__extensiondownloader__extension_rank_history"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as extensiondownloader. Review it before you use it.

Capability tags behind 7 rules

mcp__extensiondownloader__extension_top untrusted-input
mcp__extensiondownloader__extension_review_summary untrusted-input
mcp__extensiondownloader__extension_review_insights untrusted-input
mcp__extensiondownloader__extension_review_history untrusted-input
mcp__extensiondownloader__extension_reviews untrusted-input
mcp__extensiondownloader__extension_reviews_search untrusted-input
mcp__extensiondownloader__extension_source_search private-data

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/com.extensiondownloader/mcp/verify?hash=195cd97ed0328148122f405f6bebbe071e74fbc095ea58d344c919a5e6e7d2eb" | jq -e '.changed == false'

Pinned hash 195cd97ed032, from Nov 1, 2026, 15:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.extensiondownloader/mcp/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

[![anlyon.dev](https://anlyon.dev/badge/com.extensiondownloader/mcp.svg)](https://anlyon.dev/servers/com.extensiondownloader/mcp)

Source: MCP Registry. Synced Nov 1, 2026, 15:17 UTC.