@esimfly/mcp — eSIMfly MCP server

Give your AI assistant hands on the eSIMfly Business API. With this Model Context Protocol server, Claude, Cursor, ChatGPT and other MCP clients can search eSIM plans with your wholesale prices, check balances and usage, diagnose "no data" problems from live network data — and, if you enable it, place orders and top-ups with an explicit confirmation step.

• Read-only by default. Nothing can spend your balance unless you opt in.
• Two-step writes. Every write tool returns a preview (what, cost, balance) until called with confirm: true.
• Built on the official @esimfly/sdk — signing, retries and error codes handled.
• Ships two prompts: the complete integration guide and an eSIM diagnosis workflow.

Docs: https://docs.esimfly.net · Credentials: Business Dashboard → Settings → API Keys.

Hosted server (no install)

Prefer not to run anything locally? eSIMfly hosts this same server at https://mcp.esimfly.net/mcp. Add it as a remote MCP server in Claude.ai, ChatGPT, Claude Code (claude mcp add --transport http esimfly https://mcp.esimfly.net/mcp), Cursor or VS Code and sign in with your eSIMfly business account — OAuth 2.1, no keys to paste, write tools opt-in on the consent screen. Details: https://docs.esimfly.net/docs/mcp-server

Local install

The server runs locally over stdio; your API key never leaves your machine.

Claude Desktop

claude_desktop_config.json → mcpServers:

{
  "mcpServers": {
    "esimfly": {
      "command": "npx",
      "args": ["-y", "@esimfly/mcp"],
      "env": {
        "ESIMFLY_ACCESS_CODE": "esf_...",
        "ESIMFLY_SECRET_KEY": "sk_..."
      }
    }
  }
}

Claude Code

claude mcp add esimfly -e ESIMFLY_ACCESS_CODE=esf_... -e ESIMFLY_SECRET_KEY=sk_... -- npx -y @esimfly/mcp

Cursor / Windsurf / other MCP clients

.cursor/mcp.json (or the client's equivalent):

{
  "mcpServers": {
    "esimfly": {
      "command": "npx",
      "args": ["-y", "@esimfly/mcp"],
      "env": { "ESIMFLY_ACCESS_CODE": "esf_...", "ESIMFLY_SECRET_KEY": "sk_..." }
    }
  }
}

Docker

docker build -t esimfly-mcp .
docker run -i --rm -e ESIMFLY_ACCESS_CODE=esf_... -e ESIMFLY_SECRET_KEY=sk_... esimfly-mcp

Enable write tools

Add "ESIMFLY_MCP_ALLOW_WRITES": "true" to env. Without it the ordering, top-up, cancel, suspend, SMS and webhook tools are not even registered.

Try it

• "Find the cheapest 5 GB plan for Turkey and tell me my margin at €9.99."
• "Which of my eSIMs are active and below 200 MB?"
• "ICCID 8948010010036785060 says no data — diagnose it." (uses the diagnose_esim prompt)
• "Set up webhooks for installed / status / low-data events at https://my.app/hooks." (write tool, previews first)
• "Build me a Node.js integration." (uses the esimfly_integration_guide prompt)

Tools

Tool	What it does	Mode
search_packages	Catalogue search by destination / type with your cost price	read
get_balance	Account (or enterprise) balance	read
list_esims	Your eSIMs with status, data left, validity	read
get_esim_usage	Stored usage for one eSIM (cheap)	read
get_esim_live_status	Live status from the network: install state, last network, device, usage	read (expensive)
get_network_events	Last 7 days of attach / data-session events, wrong-network flag	read
get_usage_report	Daily usage by country and operator (up to 90 days)	read
list_orders / get_order	Order history and one order with its eSIM	read
get_topup_packages	Top-up options for one eSIM	read
get_webhook_settings	Webhook URL, events, recent deliveries	read
create_order	Buy eSIMs — preview → confirm: true + idempotency key	write
topup_esim	Add data to an eSIM — preview shows package and cost	write
cancel_esim	Cancel an unused eSIM and refund to balance	write (destructive)
suspend_esim / activate_esim	Block / restore network access	write
send_sms	Text the device holding the eSIM	write
set_webhook	Configure webhook URL and events	write

Prompts: esimfly_integration_guide (optional stack), diagnose_esim (iccid).

Safety model

• Read-only unless ESIMFLY_MCP_ALLOW_WRITES=true.
• Write tools are two-step: a call without confirm returns a preview and makes no mutable API call; create_order additionally requires the idempotency_key from its own preview, so an agent cannot place the same order twice.
• Tool annotations mark reads as readOnlyHint and cancel/suspend as destructiveHint, so hosts that ask for user approval on risky tools do so.
• The server never logs credentials and never writes to stdout except the MCP protocol.
• Give the agent a dedicated API key with the smallest rate limits you are comfortable with, and rotate it from the dashboard if in doubt.

Configuration

Variable	Required	Description
ESIMFLY_ACCESS_CODE	yes	API access code (esf_…)
ESIMFLY_SECRET_KEY	yes	API secret key (sk_…)
ESIMFLY_MCP_ALLOW_WRITES	no	true to register write tools
ESIMFLY_BASE_URL	no	Override the API base URL

Embedding

import { createEsimflyMcpServer } from '@esimfly/mcp';
const server = createEsimflyMcpServer({ config: { accessCode, secretKey }, allowWrites: false });
// connect it to any MCP transport

Releasing (maintainers)

Bump version in package.json, server.json and MCP_VERSION in src/server.ts, add a CHANGELOG entry, push, then publish a GitHub Release tagged vX.Y.Z — the workflow publishes to npm with Trusted Publishing (OIDC).

Support

support@esimfly.net · https://docs.esimfly.net