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eSIM Tabby MCP server

com.esimtabby/esimtabby

We checked this server on 2 November 2026 with McpStamp Check engine 1.2.0. It scored 91 of 100 (grade A), higher than 62.2% of the 33,003 registry servers that responded over HTTPS that day. Ready for Claude, Gemini and MCP Registry. Not ready for ChatGPT.

Measured facts

Score
91A
Sign-in
OAuth
Tools listed
11
Protocol version
2025-11-25
Stores

Store readiness

StoreStatusReason
Claude Connectors Directory Ready No blocking check failed.
ChatGPT app directory Not ready Blocked by issuer equals the authorization_servers entry; token_endpoint_auth_methods_supported (ChatGPT).
Gemini Connected Apps Ready No blocking check failed.
Official MCP Registry Ready No blocking check failed.

MCP Registry ready means a valid public remote for the registry, not that the server is listed in a store.

Fixes

5 checks to fix

  1. Fails

    issuer equals the authorization_servers entry; token_endpoint_auth_methods_supported (ChatGPT)

    auth_chatgpt_metadata

    Blocks ChatGPT.

    Measured issuer "https://scientific-cafe-65.authkit.app" is not exactly the authorization_servers entry "https://scientific-cafe-65.authkit.app/"

    Use the exact metadata "issuer" string in the protected resource metadata authorization_servers list (no trailing-slash or case differences), and list token_endpoint_auth_methods_supported (for example ["none"] for public clients) in the au

  2. Fails

    GET answers SSE or 405

    get_stream

    Measured HTTP 404 text/html

    Return HTTP 405 Method Not Allowed on GET (or a text/event-stream), not a page or 404.

  3. Warning

    Tool descriptions

    tool_descriptions

    Measured 3 under 60 chars: search_esim_plans, get_plan_details, list_my_orders

    Keep each tool description between 60 and 2000 characters: when to use it, what it returns, key limits.

  4. Warning

    initialize latency

    latency

    Measured 2231 ms

    Bring initialize under 1.5 s: avoid cold starts and upstream calls in the handshake.

  5. Warning

    JSON-RPC error for unknown method

    jsonrpc_errors

    Measured HTTP 401 instead of a JSON-RPC error

    Route the method first and answer unknown methods with JSON-RPC error -32601 before the auth check, or return a JSON-RPC error body with the 401.

22 checks passed

Passed. Served over HTTPS, initialize over Streamable HTTP, Supported protocol version negotiated, JSON or SSE response Content-Type, serverInfo name and version, Server instructions, tools capability declared, Sign-in method the store supports (OAuth or none), 401 carries WWW-Authenticate resource_metadata, Protected resource metadata (RFC 9728), Resource metadata "resource" equals the server URL, Authorization server metadata (RFC 8414 / OIDC), First metadata URL Gemini tries answers 200 with the required fields, PKCE S256 advertised, Client registration (DCR or Client ID Metadata Documents), refresh_token grant advertised, tools/list returns tools, inputSchema is an object schema, Tool names are valid and portable, readOnlyHint or destructiveHint on every tool, Explicit readOnlyHint, destructiveHint and openWorldHint (ChatGPT), Human-readable title on every tool.

Run a fresh check

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McpStamp score for eSIM Tabby

Markdown

[![McpStamp score](https://www.mcpstamp.com/badge?url=https%3A%2F%2Fesimtabby.com%2Fmcp)](https://www.mcpstamp.com/r/com-esimtabby-esimtabby/)

HTML

<a href="https://www.mcpstamp.com/r/com-esimtabby-esimtabby/"><img src="https://www.mcpstamp.com/badge?url=https%3A%2F%2Fesimtabby.com%2Fmcp" alt="McpStamp score" height="20"></a>
Registry entry

About this server

Buy and manage travel eSIM data plans in the conversation. Pay by card (Stripe) or USDC over x402.
Registry name
com.esimtabby/esimtabby
Remote URL
https://esimtabby.com/mcp
Version
0.1.3
Website
esimtabby.com
Checked
2 November 2026, engine 1.2.0, no credentials

The description above is the server's own text from the official MCP Registry. If a result looks wrong, run a fresh check and email support@zovo.one with the report link.

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