io.github.cnmars/marsgeo

by cnmars · remote · no sign-in to list tools · v1.0.0 · published by GitHub user cnmars

Generate SEO structured data: JSON-LD schema, robots.txt, sitemaps, hreflang, Open Graph, meta.

Changes · 8

Compare Registry entry

9 tools: 8 change things and 1 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things8Claude Code: ask: see these tools
Only reads1Claude Code: allow: see these tools

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http marsgeo https://mars.cx/api/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

9 tools

Changes things 8Creates or changes something that can be changed back.Claude Code: ask

generate_faq_schemaGenerate FAQPage JSON-LD structured data from question/answer pairs.No findings
Why it is in this group
- The name "generate_faq_schema" says "generate": a word for a change.
Description, as the server wrote it
Generate FAQPage JSON-LD structured data from question/answer pairs.
generate_hreflangGenerate reciprocal hreflang tags for a multilingual site.No findings
Why it is in this group
- The name "generate_hreflang" says "generate": a word for a change.
Description, as the server wrote it
Generate reciprocal hreflang tags for a multilingual site.
generate_meta_descriptionTrim and format a paragraph into a meta description within length limits.No findings
Why it is in this group
- The name "generate_meta_description" says "generate": a word for a change.
Description, as the server wrote it
Trim and format a paragraph into a meta description within length limits.
generate_open_graphGenerate Open Graph social-preview meta tags.Can send data outNo findings
Why it is in this group
- The name "generate_open_graph" says "generate": a word for a change.
What it can reach
- outboundThe input takes a URL (input.url): a request to a URL can carry data to whoever runs it.
Description, as the server wrote it
Generate Open Graph social-preview meta tags.
generate_product_schemaGenerate Product JSON-LD structured data.No findings
Why it is in this group
- The name "generate_product_schema" says "generate": a word for a change.
Description, as the server wrote it
Generate Product JSON-LD structured data.
generate_robots_txtGenerate a robots.txt file with allow/disallow rules and an optional sitemap.No findings
Why it is in this group
- The name "generate_robots_txt" says "generate": a word for a change.
Description, as the server wrote it
Generate a robots.txt file with allow/disallow rules and an optional sitemap.
generate_sitemapGenerate an XML sitemap from a list of URLs.Can send data outNo findings
Why it is in this group
- The name "generate_sitemap" says "generate": a word for a change.
What it can reach
- outboundThe input takes a URL (input.urls): a request to a URL can carry data to whoever runs it.
Description, as the server wrote it
Generate an XML sitemap from a list of URLs.
run_marsgeo_toolRun any MarsGeo SEO tool by slug.No findings
Why it is in this group
- The name "run_marsgeo_tool" says "run": a word for a change.
Description, as the server wrote it
Run any MarsGeo SEO tool by slug. Supported: faq-schema-generator, article-schema-generator, product-schema-generator, how-to-schema-generator, breadcrumb-schema-generator, organization-schema-generator, robots-txt-generator, sitemap-generator, hreflang-generator, meta-description-generator, open-graph-generator, serp-snippet-preview, keyword-density-analyzer, schema-validator, meta-tag-extractor, heading-extractor, json-ld-extractor.

Only reads 1Looks things up and changes nothing.Claude Code: allow

validate_json_ldValidate JSON-LD and return the pretty-printed block plus detected @type.No findings
Why it is in this group
- The name "validate_json_ld" says "validate": a word for reading.
Description, as the server wrote it
Validate JSON-LD and return the pretty-printed block plus detected @type.

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 private-data or untrusted-input.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out2: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.; generate_open_graph
generate_sitemap

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.

Looked at Oct 22, 2026, 14:57 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 8
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: none
RFC 9728 protected resource metadata: none
Authorization servers: none
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 8 tools that change things (8 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://mars.cx/api/mcp: tools/list returned 9 tools to an anonymous client, including run_marsgeo_tool (write), generate_faq_schema (write), generate_product_schema (write), generate_robots_txt (write), generate_sitemap (write) and 3 more
What this check looks for

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http marsgeo https://mars.cx/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__marsgeo__validate_json_ld"
    ],
    "ask": [
      "mcp__marsgeo__run_marsgeo_tool",
      "mcp__marsgeo__generate_faq_schema",
      "mcp__marsgeo__generate_product_schema",
      "mcp__marsgeo__generate_robots_txt",
      "mcp__marsgeo__generate_sitemap",
      "mcp__marsgeo__generate_hreflang",
      "mcp__marsgeo__generate_open_graph",
      "mcp__marsgeo__generate_meta_description"
    ],
    "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 marsgeo. Review it before you use it.

Capability tags behind 2 rules

mcp__marsgeo__generate_sitemap outbound
mcp__marsgeo__generate_open_graph outbound

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.cnmars/marsgeo/changes.xml

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Anlyon alternative

8 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.

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Source: MCP Registry · repository. Synced Oct 21, 2026, 18:27 UTC.

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