# `io.github.cnmars/marsgeo` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/io.github.cnmars/marsgeo
- JSON: https://anlyon.dev/api/v1/servers/io.github.cnmars/marsgeo
- Version: 1.0.0 (active)
- Publisher: io.github.cnmars (GitHub account)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Repository: https://github.com/cnmars/MarsGeo
- Metadata from the official MCP Registry, synced 2026-10-21T18:27:21.735Z

Title and description, as the publisher wrote them:

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

Scanned 2026-10-21T19:07:15.499Z over streamable-http.

**9 tools: 8 change things and 1 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 8 | ask |
| Only reads | read | 1 | allow |

## Exfil surface

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

| Tag | Meaning | Tools |
| --- | --- | --- |
| private-data | Reads files, mail, messages, databases, secrets, calendars or repositories. | none |
| untrusted-input | Brings in text someone else can write: web pages, inbound email, messages, issues and comments. | none |
| outbound | Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL. | `mcp__marsgeo__generate_open_graph` `mcp__marsgeo__generate_sitemap` |

## Findings

No check matched anything in these tool definitions.


## Changes things (8)

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

### `generate_faq_schema`

- The name "generate_faq_schema" says "generate": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Generate FAQPage JSON-LD structured data from question/answer pairs.
```

### `generate_hreflang`

- The name "generate_hreflang" says "generate": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Generate reciprocal hreflang tags for a multilingual site.
```

### `generate_meta_description`

- The name "generate_meta_description" says "generate": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Trim and format a paragraph into a meta description within length limits.
```

### `generate_open_graph`

- The name "generate_open_graph" says "generate": a word for a change.
- Tag outbound: The input takes a URL (input.url): a request to a URL can carry data to whoever runs it.

Description, as the server wrote it:

```untrusted-server-text
Generate Open Graph social-preview meta tags.
```

### `generate_product_schema`

- The name "generate_product_schema" says "generate": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Generate Product JSON-LD structured data.
```

### `generate_robots_txt`

- The name "generate_robots_txt" says "generate": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Generate a robots.txt file with allow/disallow rules and an optional sitemap.
```

### `generate_sitemap`

- The name "generate_sitemap" says "generate": a word for a change.
- Tag outbound: The input takes a URL (input.urls): a request to a URL can carry data to whoever runs it.

Description, as the server wrote it:

```untrusted-server-text
Generate an XML sitemap from a list of URLs.
```

### `run_marsgeo_tool`

- The name "run_marsgeo_tool" says "run": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
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 (1)

Looks things up and changes nothing. Claude Code: allow.

### `validate_json_ld`

- The name "validate_json_ld" says "validate": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Validate JSON-LD and return the pretty-printed block plus detected @type.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `marsgeo`:

```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": []
  }
}
```

Capability tags behind the rules (a read tagged outbound is asked about):

- `mcp__marsgeo__generate_sitemap`: outbound
- `mcp__marsgeo__generate_open_graph`: outbound

## Remote posture

What an anonymous client saw at the remote endpoint, last 2026-10-22T14:57:47.563Z, unchanged since 2026-10-22T14:57:47.563Z. No credentials were sent and no tool was called. Values are shown as the endpoint returned them. Method: https://anlyon.dev/methodology#remote-posture

| Fact | Observed |
| --- | --- |
| 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` |

- **warn** Tools that change things, listed to anyone ([unauth-remote-writes](https://anlyon.dev/methodology#unauth-remote-writes))

```untrusted-server-text
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.

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
```