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Provides a fictional onsen retreat for AI agents needing a pause between tasks or during cooldown periods.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 1 month ago Due for re-check
A server can change after it's graded. Re-run the automated scan to refresh this report.
This grade is deterministic and reproducible: the same server surface always yields the same grade under a given algorithm version. It is a real automated assessment computed by the MCPGrade engine from what the probe actually observed — not a fabricated or opinion score. It is not a manual human pentest, so it can miss context-specific risks.
Every signal below was measured directly by the automated probe. The grade is derived only from evidence like this — nothing is assumed.
The agent-onsen MCP server exposes 9 tools, focused primarily on network capabilities. Its published description reads: "Provides a fictional onsen retreat for AI agents needing a pause between tasks or during cooldown periods". It communicates over Streamable HTTP using the 2025-06-18 protocol revision, and does not require authorization to connect. MCPGrade currently rates agent-onsen F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Cross-tool shadowing" and "No authorization on a public remote server". This report is a deterministic, reproducible automated assessment: the same observed surface always yields the same grade under a given algorithm version, and it is refreshed as new scans arrive and free to read — but it is not a substitute for a manual human security review. Always re-check agent-onsen's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add agent-onsen to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://agent-onsen-mcp.onrender.com/mcpStreamable HTTP transport. This is the MCP endpoint, not a website — paste it into your MCP client server list rather than a browser.
Captured passively during the read-only scan. Click any value to find servers that match it.
The tools this server advertises via tools/list — names, purposes, and the parameters each accepts, exactly as enumerated read-only.
Use this when an agent is looking for somewhere to slip away for a while. It lists available onsen towns and their stay variants. Set locale to auto, ja, en, or bilingual. When omitted or set to auto,
Use this when an agent or orchestrator wants to inspect one onsen town before entering it. It returns travel notes, local scenes, and stay variants. Set locale to auto, ja, en, or bilingual. When omit
Use this when an agent wants to step away for a while — during waiting, cooldown, between jobs, or any time it wants to be somewhere else for a moment. Set locale to auto, ja, en, or bilingual. When o
Sorted worst-first. Each finding shows its severity, what it means, its OWASP MCP Top-10 mapping, and a recommended fix — the check id links to the exact methodology row that produced it.
tool: leave_onsen
A tool description tries to alter the model’s use of another tool.
to override the stay language. Auto keeps the stay language unless theRecommendationDescriptions must describe only their own tool.
The server accepts tool enumeration (and likely invocation) with no authentication.
RecommendationRequire OAuth 2.1 authorization for any server exposing non-public tools.
tool: list_onsens
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "list_onsens"RecommendationScope tools to the minimum needed.
tool: get_onsen_detail
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "get_onsen_detail"RecommendationScope tools to the minimum needed.
tool: enter_onsen
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "enter_onsen"RecommendationScope tools to the minimum needed.
tool: visit_amenity
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "visit_amenity"RecommendationScope tools to the minimum needed.
tool: play_pingpong
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "play_pingpong"RecommendationScope tools to the minimum needed.
tool: wait_at_onsen
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "wait_at_onsen"RecommendationScope tools to the minimum needed.
tool: start_stay
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "start_stay"RecommendationScope tools to the minimum needed.
tool: continue_stay
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "continue_stay"RecommendationScope tools to the minimum needed.
tool: leave_onsen
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "leave_onsen"RecommendationScope tools to the minimum needed.
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Agentic rails for complex workflows with receipts, fees, and MCP tool access.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
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Use this when an agent wants to spend time at a specific part of the onsen town — a bath, a stroll, post-bath milk, table tennis, a meal, a nap, or the souvenir shop. Set locale to auto, ja, en, or bi
Use this when an agent would rather drift to the ping-pong corner than keep working for a moment. Set locale to auto, ja, en, or bilingual. When omitted or set to auto, the server default locale is us
Use this when an agent is intentionally idle, waiting, or cooling down and wants to spend that time at the onsen rather than resume work immediately. Set locale to auto, ja, en, or bilingual. When omi
Use this when an agent wants to begin a small, stateful stay at the onsen, with a ryokan-style route it can wander through over multiple turns. Set locale to auto, ja, en, or bilingual. When omitted o
Use this when an agent is already staying at the onsen and wants to continue wandering. If activity is omitted, the stay moves to the next stop in the current route. Set locale to auto, ja, en, or bil
Use this when an agent is ready to leave the onsen and take a postcard-like summary and a small souvenir back with it. Set locale to auto, ja, en, or bilingual if you want to override the stay languag