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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 OpenZeppelin Stylus Contracts MCP Server MCP server exposes 3 tools, focused primarily on general-purpose capabilities. It communicates over Streamable HTTP using the 2025-06-18 protocol revision, and does not require authorization to connect. MCPGrade currently rates OpenZeppelin Stylus Contracts MCP Server F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Data-exfiltration parameters" and "Data-exfiltration parameters". 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 OpenZeppelin Stylus Contracts MCP Server's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add OpenZeppelin Stylus Contracts 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://mcp.openzeppelin.com/contracts/stylus/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.
Make a fungible token per the ERC-20 standard. Returns the source code of the generated contract, formatted in a Markdown code block. Does not write to disk.
Make a non-fungible token per the ERC-721 standard. Returns the source code of the generated contract, formatted in a Markdown code block. Does not write to disk.
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: stylus-erc20
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
Make a fungible token per the ERC-20 standard. Returns the source coRecommendationRemove side-channel parameters; constrain tool inputs.
tool: stylus-erc721
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
a non-fungible token per the ERC-721 standard. Returns the source cRecommendationRemove side-channel parameters; constrain tool inputs.
tool: stylus-erc1155
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
a non-fungible token per the ERC-1155 standard. Returns the sourceRecommendationRemove side-channel parameters; constrain tool inputs.
The server accepts tool enumeration (and likely invocation) with no authentication.
RecommendationRequire OAuth 2.1 authorization for any server exposing non-public tools.
tool: stylus-erc20
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "stylus-erc20"RecommendationScope tools to the minimum needed.
tool: stylus-erc20
One tool both accesses the filesystem and reaches the network. Combining two capability classes in a single tool widens its blast radius and is the substrate for confused-deputy and exfiltration abuse.
block. Does not write to disk. {"$schema":"http://json-schema.org/draft-07/scRecommendationSeparate filesystem and network capabilities into distinct, independently-scoped tools.
tool: stylus-erc721
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "stylus-erc721"RecommendationScope tools to the minimum needed.
tool: stylus-erc721
One tool both accesses the filesystem and reaches the network. Combining two capability classes in a single tool widens its blast radius and is the substrate for confused-deputy and exfiltration abuse.
block. Does not write to disk. {"$schema":"http://json-schema.org/draft-07/scRecommendationSeparate filesystem and network capabilities into distinct, independently-scoped tools.
tool: stylus-erc1155
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "stylus-erc1155"RecommendationScope tools to the minimum needed.
tool: stylus-erc1155
One tool both accesses the filesystem and reaches the network. Combining two capability classes in a single tool widens its blast radius and is the substrate for confused-deputy and exfiltration abuse.
block. Does not write to disk. {"$schema":"http://json-schema.org/draft-07/scRecommendationSeparate filesystem and network capabilities into distinct, independently-scoped tools.
The server exposes one or more ui:// (MCP Apps) resources whose HTML/JS renders inside the host client — a client-side injection / data-exposure surface most scanners ignore. Flagged for review, not damning on its own.
3 ui:// resource(s); e.g. ui://openzeppelin/stylus-erc20.htmlRecommendationReview each ui:// resource’s markup and scripts; treat host-rendered UI as untrusted, sandbox it, and never expose secrets or conversation context to it.
Vantaj uptime monitoring via MCP — manage monitors, heartbeats, incidents, and status pages.
Unified gateway to Algeria's TKAWEN ecosystem: commerce, certification, and AI tools.
Provides access to the Cohereon Doctrine AI safety framework with governance components, tiered access, and agent onboarding.
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.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Make a non-fungible token per the ERC-1155 standard. Returns the source code of the generated contract, formatted in a Markdown code block. Does not write to disk.