Try source-native download, OA repositories, Unpaywall, then optional Sci-Hub.
AI agents call download_with_fallback to retrieve information from Paper Search without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool's primary function is to retrieve and download existing academic papers from legal open access repositories and services (OA repositories, Unpaywall). While it mentions "optional Sci-Hub" which involves copyright-circumvention concerns, the action itself is retrieval-only with no side effects on data integrity, creation, modification, or deletion.
From the tool's definition Tool retrieves academic papers via "download...OA repositories, Unpaywall, then optional Sci-Hub" without modifying or deleting data. Described as a fallback download mechanism across open access and legal sources.
Attacks that exploit this kind of access
Try source-native download, OA repositories, Unpaywall, then optional Sci-Hub. It is categorised as a Read tool in the Paper Search MCP Server, which means it retrieves data without modifying state.
Register the Paper Search MCP server in PolicyLayer and add a rule for download_with_fallback: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Paper Search. Nothing to install.
download_with_fallback is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the download_with_fallback rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for download_with_fallback. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
download_with_fallback is provided by the Paper Search MCP server (its-antony/paper-search). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →