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oganvil — OG (Open Graph) Image Generation API

by oganvil.rowu.workers.dev · remote · no sign-in to list tools · v1.0.0 · published by dev.workers.rowu.oganvil

Generates 1200x630 OG social preview images (PNG/SVG). Tools: generate_og_image, get_quota.

Changes · 1
CompareRegistry entry

2 tools: 1 change things and 1 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http og-image-api https://oganvil.rowu.workers.dev/mcp --header 'Authorization: <your-authorization>'

Tools

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

2 tools

Changes things 1Claude Code: ask
  • generate_og_imageGenerate a 1200x630 Open Graph image (PNG or SVG) from a title and tag line.No findings

    Why it is in this group

    • The name "generate_og_image" says "generate": a word for a change.
    Description, as the server wrote it
    Generate a 1200x630 Open Graph image (PNG or SVG) from a title and tag line. Returns the image as MCP image content plus a hosted render URL. Counts against your monthly unique-image quota.
Only reads 1Claude Code: allow
  • get_quotaReturn current monthly usage and plan limit for the authenticated key.No findings

    Why it is in this group

    • The name "get_quota" says "get": a word for reading.
    Description, as the server wrote it
    Return current monthly usage and plan limit for the authenticated key. Does not consume quota.

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 or outbound.

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 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.

Looked at Oct 22, 2026, 14:47 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
1
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
https://oganvil.rowu.workers.dev/.well-known/oauth-protected-resource/mcp
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 1 tool that changes things (1 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://oganvil.rowu.workers.dev/mcp: tools/list returned 2 tools to an anonymous client, including generate_og_image (write)

    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 og-image-api https://oganvil.rowu.workers.dev/mcp --header 'Authorization: <your-authorization>'

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__og-image-api__get_quota"
    ],
    "ask": [
      "mcp__og-image-api__generate_og_image"
    ],
    "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 og-image-api. Review it before you use it.