Buy UK eSIM
https://mcp.buyukesim.com/mcp ↗
Description
BuyUKeSIM runs a Model Context Protocol (MCP) server, so any MCP-capable AI assistant - Claude, ChatGPT, Cursor, VS Code Copilot, Gemini CLI and others - can work with our eSIM catalogue directly. Point your assistant at one endpoint and it can search plans, list coverage, explain the UK Number, and check an order, all in plain language. The public tools need no key and move no money. A second, authenticated set of tools adds a prepaid, crypto-funded agent wallet so an assistant can fund a balance and buy a travel/data eSIM on your behalf. There is no account and no KYC. This page is the full reference: endpoints, setup per client, every tool, authentication, runnable examples, error handling and FAQ.
What our measurements say
Buy UK eSIM is a remote MCP server published at mcp.buyukesim.com. It has been probed 6 times since 9/10/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 280 ms, placing it among the faster endpoints. It offers a narrow, focused set of 9 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Most tool names directly reflect their purpose (e.g., 'search_esim_plans')
- Some descriptions explain use cases (e.g., 'list_covered_countries' clarifies plan counts per region)
Weaknesses
- Multiple descriptions are truncated mid-sentence (e.g., 'get_esim_exit_countries')
- Parameter requirements/optional fields are inconsistently documented
- No explicit error handling or constraint information in any tool descriptions
get_esim_exit_countries— Description cut off mid-sentence, losing critical context about roaming behaviorlist_reviews— Truncated description hides important details about unmoderated review systemget_payment_and_delivery_times— No clarification on required parameters for crypto payment queriescheck_uk_coverage— Incomplete explanation of reporting methodology for coverage checksget_bundle_info— Truncated description omits key details about bundle activation process
Verdict
Event narrative
Risk: medium
- 2026-09-10T21:16:35.016Z — era changed from null to 'auth-gated' · system moved to authentication-controlled state
- 2026-09-11T09:28:19.138Z — era changed from 'auth-gated' to 'legacy', complianceScore set to 100 · transitioned to legacy mode with full compliance
- 2026-09-11T15:07:20.625Z — no change in era or complianceScore · stable state maintained in legacy mode
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 47ms → warm 39ms (penalty 8ms)
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: — → 1.3.0
- Supported versions: — → 2025-06-18
- Era changed: Auth-gated → Legacy
- Added to watch — era: Auth-gated
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