Skip to content

MapPoster

by mapposter.xyz · remote · no sign-in to list tools · v1.2.0 · published by xyz.mapposter

Design map posters of any place in 50+ styles, with names, dates and markers, and order prints.

Changes · 1
CompareRegistry entry

3 tools: 1 change things and 2 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http mapposter https://mcp.mapposter.xyz/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warncreate_poster

    The server marks "create_poster" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "create_poster" says "create": a word for a change.

    What this check looks for

Tools

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

3 tools

Changes things 1Claude Code: ask
  • create_posterDesigns a map poster and shows it in the chat.Reads text others write1 finding

    Why it is in this group

    • The name "create_poster" says "create": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.

    Findings

    • Warn

      The server marks "create_poster" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "create_poster" says "create": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Designs a map poster and shows it in the chat. Use this when the user wants a map poster, map print, map wall art or map wallpaper of a real place, or a map poster as an anniversary, Valentine's, wedding, engagement or housewarming gift tied to a place: where a couple met or married, a first home, a hometown, a city someone is leaving, a trip, a marathon someone ran or a birthplace. Not for general gift advice, directions, travel plans, star or night-sky maps, photo posters, 3D, wooden, scratch-off or push-pin maps, or hiking trails and GPX tracks. Takes a city, neighborhood, address, landmark or coordinates (up to three places) and links to the MapPoster editor to fine-tune it or, in the drawn map styles, order it printed. Give a `place` or `lat`/`lon`; the rest is optional. Nothing is saved or bought: the design lives in the link.

    Annotations the server declares

    • title: Create map poster
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
Only reads 2Claude Code: allow
  • list_themesUse this when the user wants to see or choose a map poster's style: its colors, a mood (minimalist, black and white, vintage, blueprint, dark, pastel, or pink for a wedding or anni…No findings

    Why it is in this group

    • The name "list_themes" says "list": a word for reading.
    Description, as the server wrote it
    Use this when the user wants to see or choose a map poster's style: its colors, a mood (minimalist, black and white, vintage, blueprint, dark, pastel, or pink for a wedding or anniversary) or a theme by name. Lists the MapPoster themes (color styles) with their key colors, whether the PNG download covers them, and which ones are for personal use only. Pass the theme key to create_poster.

    Annotations the server declares

    • title: List poster themes
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • search_locationUse this when a map poster needs a place's coordinates, such as the street or venue to mark (where a couple met, a new home), or when the place the user named is ambiguous (several…Reads text others writeNo findings

    Why it is in this group

    • The name "search_location" says "search": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Use this when a map poster needs a place's coordinates, such as the street or venue to mark (where a couple met, a new home), or when the place the user named is ambiguous (several towns share the name) and they should pick one. Finds a city, neighborhood, street address, venue, landmark or coordinates and gives its coordinates and a suggested zoom level; use the result with create_poster. Not for directions, travel times, general map questions or the user's current location.

    Annotations the server declares

    • title: Search location
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true

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 outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write2
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, 15:16 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
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 1 tool that changes things (1 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://mcp.mapposter.xyz/mcp: tools/list returned 3 tools to an anonymous client, including create_poster (write)

    What this check looks for

Install

Pinned to version 1.2.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http mapposter https://mcp.mapposter.xyz/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__mapposter__search_location",
      "mcp__mapposter__list_themes"
    ],
    "ask": [
      "mcp__mapposter__create_poster"
    ],
    "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 mapposter. Review it before you use it.

Capability tags behind 2 rules
  • mcp__mapposter__search_location untrusted-input
  • mcp__mapposter__create_poster untrusted-input