esimdata: travel eSIM comparison
app.esimdata/esimdataesimdata.appstreamable-httpv0.1.0Scanned
Neutral travel eSIM comparison: search and compare plans from many providers, ranked by price.
6 tools: 3 change things and 3 only read.
- Reads private data · 0
- Reads text others write · 1
- Can send data out · 0
- 1 finding
Tools listed without sign-in. Remote posture
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.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
6 tools
Changes things 3Claude Code: ask
check_phoneCheck whether a phone, tablet or watch model supports eSIM, from the manufacturer's own published list (with regional exceptions, e.g.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 Check whether a phone, tablet or watch model supports eSIM, from the manufacturer's own published list (with regional exceptions, e.g. models sold in mainland China), with the source link.
Annotations the server declares
- title: Does this phone support eSIM?
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
compare_plansPut 2 to 10 plans (ids from search_plans) side by side with the same fields, in the order given, to help a traveller choose.1 finding
Why it is in this group
- The name "compare_plans" says "compare": a word for reading.
- The description's first verb is "put": 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 "compare_plans" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "compare_plans" says "compare": a word for reading.
Description, as the server wrote it Put 2 to 10 plans (ids from search_plans) side by side with the same fields, in the order given, to help a traveller choose.
Annotations the server declares
- title: Compare eSIM plans
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
country_overviewA destination at a glance: how many plans and providers, the cheapest plan, the cheapest per GB, and which mobile networks the providers say they use there.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 A destination at a glance: how many plans and providers, the cheapest plan, the cheapest per GB, and which mobile networks the providers say they use there.
Annotations the server declares
- title: eSIM market for a country
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
Only reads 3Show 3 read-only tools
get_planEverything esimdata knows about one plan (by the id search_plans returned): all countries it covers, networks, policies, the provider's own page, the buy link and its price history…No findings
Why it is in this group
- The name "get_plan" says "get": a word for reading.
Description, as the server wrote it Everything esimdata knows about one plan (by the id search_plans returned): all countries it covers, networks, policies, the provider's own page, the buy link and its price history.
Annotations the server declares
- title: Get one eSIM plan
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_providersEvery eSIM provider esimdata compares, with its website and whether esimdata earns a commission when a traveller buys through it (ranking never depends on it).Reads text others writeNo findings
Why it is in this group
- The name "list_providers" says "list": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "website": it reads web pages, which anyone can write.
Description, as the server wrote it Every eSIM provider esimdata compares, with its website and whether esimdata earns a commission when a traveller buys through it (ranking never depends on it).
Annotations the server declares
- title: eSIM providers tracked
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_plansFind travel eSIM data plans for a destination from every provider esimdata tracks, ranked neutrally by price (or price per GB, or validity).No findings
Why it is in this group
- The name "search_plans" says "search": a word for reading.
Description, as the server wrote it Find travel eSIM data plans for a destination from every provider esimdata tracks, ranked neutrally by price (or price per GB, or validity). Filter by trip length, data, unlimited, needs (hotspot, 5G, phone number, top-up, no ID check) and budget. Each result has a buy_url to the provider's page and the time the price was checked.
Annotations the server declares
- title: Search travel 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.
- 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 23, 2026, 15:18 UTC, unchanged since Oct 23, 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
- not observed
- RFC 9728 protected resource metadata
- not observed
- Authorization servers
- not observed
- 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.
What this check looks forMatched text
https://esimdata.app/mcp: tools/list returned 6 tools to an anonymous client, including compare_plans (write), country_overview (write), check_phone (write)
Findings
Matches of fixed checks, with the text they matched.
- Warncompare_plans
The server marks "compare_plans" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "compare_plans" says "compare": a word for reading.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 0.1.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http esimdata https://esimdata.app/mcpclaude mcp add --transport http esimdata https://esimdata.app/mcpRun 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.
{
"permissions": {
"allow": [
"mcp__esimdata__search_plans",
"mcp__esimdata__get_plan",
"mcp__esimdata__list_providers"
],
"ask": [
"mcp__esimdata__compare_plans",
"mcp__esimdata__country_overview",
"mcp__esimdata__check_phone"
],
"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 esimdata. Review it before you use it.
Capability tags behind 1 rule
- mcp__esimdata__list_providers untrusted-input
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/app.esimdata/esimdata/verify?hash=919d99427877cbd408e5202fd60ee4f23928a59f1f4f0dabe4ebdbc67af4ce2a" | jq -e '.changed == false'Pinned hash 919d99427877, from Oct 23, 2026, 14:20 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
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[](https://anlyon.dev/servers/app.esimdata/esimdata)Source: MCP Registry. Synced Oct 23, 2026, 14:20 UTC.