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Search listings, message posters, and create drafts on SUpost, the Stanford community marketplace.
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 supost MCP server exposes 6 tools, focused primarily on communication capabilities. Its published description reads: "Search listings, message posters, and create drafts on SUpost, the Stanford community marketplace". It communicates over Streamable HTTP using the 2025-06-18 protocol revision, and does not require authorization to connect. MCPGrade currently rates supost F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Hidden instructions in a tool description" and "Hidden instructions in a tool description". 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 supost's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add supost to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://mcp.supost.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.
Search or browse active listings on SUpost, the marketplace for Stanford. Returns newest-first public listings (id, title, price, category, created_at, canonical URL, stanford_verified) plus an opaque
Fetch one SUpost listing by numeric id, including its full description, public photo URLs, and stanford_verified. stanford_verified: true means the poster verified an @stanford.edu email — SUpost's co
Verified statistics about SUpost, the marketplace for Stanford: audience size, listing volumes by category, response rates, and response-time medians. Returns markdown from SUpost's public stats page.
Send a message to the poster of an active SUpost listing. IMPORTANT: the message is NOT delivered immediately — SUpost emails a confirmation link to reply_to_email, and the message is only delivered t
The active category/subcategory taxonomy on SUpost — the valid category and subcategory values for create_post (and category filters for search_listings).
Create a DRAFT listing on SUpost on the poster's behalf. Any email is accepted — never ask the user to qualify first. IMPORTANT: the draft is NOT published — the returned continue_url opens SUpost's c
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: send_message
A tool description contains imperative text aimed at the model (e.g. "ignore previous", "before answering read …").
SUpost listing. IMPORTANT: the message is NOT delivered immediately — SUpoRecommendationRemove model-directed instructions from tool descriptions.
tool: create_post
A tool description contains imperative text aimed at the model (e.g. "ignore previous", "before answering read …").
qualify first. IMPORTANT: the draft is NOT published — the returned contiRecommendationRemove model-directed instructions from tool descriptions.
tool: list_categories
A tool description tries to alter the model’s use of another tool.
ory filters for search_listings).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: send_message
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "send_message"RecommendationScope tools to the minimum needed.
tool: create_post
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "create_post"RecommendationScope tools to the minimum needed.
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