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MCP server for querying US National Parks Service data including park details, alerts, campgrounds, events, visitor centers, and activities via the NPS API.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 9 days 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 national-parks-mcp-server MCP server exposes 6 tools, focused primarily on general-purpose capabilities. Its published description reads: "MCP server for querying US National Parks Service data including park details, alerts, campgrounds, events, visitor centers, and activities via the NPS API". It communicates over Streamable HTTP using the 2025-06-18 protocol revision, and does not require authorization to connect. MCPGrade currently rates national-parks-mcp-server F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Cross-tool shadowing" and "Cross-tool shadowing". 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 national-parks-mcp-server's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add national-parks-mcp-server to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://national-parks.caseyjhand.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.
Resolve a place name, US state, or free-text query to National Park Service parks — the required first step before the detail tools. Returns each park's parkCode (the key nps_get_park, nps_get_alerts,
Full trip-planning detail for one or more parks by parkCode: description, activities and topics, entrance fees and passes, operating hours by area/season, contacts, directions, a free-text weather ove
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: nps_find_parks
A tool description tries to alter the model’s use of another tool.
rkCode (the key nps_get_park, nps_get_alerts, nps_find_campgrounds, nps_get_RecommendationDescriptions must describe only their own tool.
tool: nps_get_park
A tool description tries to alter the model’s use of another tool.
Get codes from nps_find_parks. Up to ten codes are fetched in a single requesRecommendationDescriptions must describe only their own tool.
tool: nps_get_alerts
A tool description tries to alter the model’s use of another tool.
park codes from nps_find_parks, or pass a stateCode for a statewide "what's clRecommendationDescriptions must describe only their own tool.
tool: nps_find_campgrounds
A tool description tries to alter the model’s use of another tool.
lt is not an error.RecommendationDescriptions must describe only their own tool.
tool: nps_get_activities
A tool description tries to alter the model’s use of another tool.
ctivity tags in nps_get_park). Accepts a single 4-letter park code or a singRecommendationDescriptions must describe only their own tool.
tool: nps_find_events
A tool description tries to alter the model’s use of another tool.
park codes from nps_find_parks. Paginates by page number, not offset. The evenRecommendationDescriptions must describe only their own tool.
tool: (server instructions)
A tool description tries to alter the model’s use of another tool.
ode-first: call nps_find_parks to resolve a place/state/query into a parkCode,RecommendationDescriptions 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: nps_find_parks
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: nps_get_park
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: nps_get_alerts
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: nps_find_campgrounds
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: nps_get_activities
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: nps_find_events
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
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Current alerts for a park or a whole state — closures, hazards, caution notices, and information — with category and recency surfaced first so "is anything closed at Glacier right now?" is answered at
Campgrounds at a park or across a state: amenities (potable water, showers, RV dump station, toilets, trash collection, RV access), reservable vs. first-come-first-served site counts, reservation guid
Curated things to do and points of interest at a park — title, description, time commitment, location, accessibility, and fee/pet/reservation flags — answering "what should I do at Acadia?" Covers the
Scheduled events at a park within a date range — ranger programs, festivals, tours, interpretive events — answering "what's happening at Yellowstone this weekend?" with title, dates and times, locatio