Simsima Connectivity

by Willyfab · remote · no sign-in to list tools · v0.1.0 · published by GitHub user Willyfab

Search, recommend & buy travel eSIM data plans for 190+ destinations via AI agents.

Changes · 3

Compare Registry entry

7 tools: 3 change things and 4 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things3Claude Code: ask: see these tools
Only reads4Claude Code: allow: see these tools

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

claude mcp add --transport http simsima-connectivity https://mcp.simsima.io/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn

Warncreate_checkout_link
The server marks "create_checkout_link" 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":false}; The name "create_checkout_link" 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.

7 tools

Changes things 3Creates or changes something that can be changed back.Claude Code: ask

check_coverageAnswer "does this eSIM work in <country>" for a destination (country, region or global plan).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
Answer "does this eSIM work in <country>" for a destination (country, region or global plan). Accepts a country name or ISO code.
Annotations the server declares
- title: Check whether a destination covers a country
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
create_checkout_linkReturn the URL of a plan's page on simsima.io, with the plan preselected, where the user can review and buy it.1 finding
Why it is in this group
- The name "create_checkout_link" says "create": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "create_checkout_link" 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":false}; The name "create_checkout_link" says "create": a word for a change.
  What this check looks for
Description, as the server wrote it
Return the URL of a plan's page on simsima.io, with the plan preselected, where the user can review and buy it. No order is placed and no payment is made by this tool. Pass the sku of the chosen plan; with only a destination, the link opens the destination's page without a preselected plan.
Annotations the server declares
- title: Get a link to buy a plan on simsima.io
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
recommend_planRecommend the best plan(s) for a trip to a destination, given its length in days and expected data usage (light, medium or heavy).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
Recommend the best plan(s) for a trip to a destination, given its length in days and expected data usage (light, medium or heavy).
Annotations the server declares
- title: Recommend an eSIM plan
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 4Looks things up and changes nothing.Claude Code: allow

get_destination_infoCoverage (ISO country codes), mobile operators, top-up availability and entry price for a destination.No findings
Why it is in this group
- The name "get_destination_info" says "get": a word for reading.
Description, as the server wrote it
Coverage (ISO country codes), mobile operators, top-up availability and entry price for a destination.
Annotations the server declares
- title: Get destination coverage and networks
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_planGet one eSIM plan by its sku, as returned by search_plans or recommend_plan.No findings
Why it is in this group
- The name "get_plan" says "get": a word for reading.
Description, as the server wrote it
Get one eSIM plan by its sku, as returned by search_plans or recommend_plan.
Annotations the server declares
- title: Get eSIM plan detail
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_destinationsList the destinations Simsima covers (countries, regions and global plans), with the entry price and product URL of each.Reads text others writeNo findings
Why it is in this group
- The name "list_destinations" says "list": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "list" and "url": it reads web pages, which anyone can write.
Description, as the server wrote it
List the destinations Simsima covers (countries, regions and global plans), with the entry price and product URL of each.
Annotations the server declares
- title: List eSIM destinations
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_plansSearch the eSIM plans of a destination (country, region or global), cheapest first, with optional filters on price, data, validity and unlimited data.No findings
Why it is in this group
- The name "search_plans" says "search": a word for reading.
Description, as the server wrote it
Search the eSIM plans of a destination (country, region or global), cheapest first, with optional filters on price, data, validity and unlimited data.
Annotations the server declares
- title: Search eSIM plans
- 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 private-data or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write1: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; list_destinations
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, 14:55 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: 3
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 3 tools that change things (3 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://mcp.simsima.io/mcp: tools/list returned 7 tools to an anonymous client, including recommend_plan (write), create_checkout_link (write), check_coverage (write)
What this check looks for

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http simsima-connectivity https://mcp.simsima.io/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__simsima-connectivity__list_destinations",
      "mcp__simsima-connectivity__search_plans",
      "mcp__simsima-connectivity__get_plan",
      "mcp__simsima-connectivity__get_destination_info"
    ],
    "ask": [
      "mcp__simsima-connectivity__recommend_plan",
      "mcp__simsima-connectivity__create_checkout_link",
      "mcp__simsima-connectivity__check_coverage"
    ],
    "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 simsima-connectivity. Review it before you use it.

Capability tags behind 1 rule

mcp__simsima-connectivity__list_destinations untrusted-input

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.Willyfab/simsima-connectivity/changes.xml

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

Anlyon alternative

3 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, 18:22 UTC.

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