AI agents call rescan_folder to retrieve information from Md without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to refresh or re-index local markdown files within the server's knowledge base, a read-only operation with no side effects on data. The empty description reduces confidence, but the context (md-mcp server for documentation access) and sibling tools (list_files, search_markdown) suggest this performs filesystem introspection rather than modification.
From the tool's definition Tool name 'rescan_folder' and server context indicate local filesystem scanning for markdown documentation. Description is empty, limiting confidence.
Attacks that exploit this kind of access
rescan_folder. It is categorised as a Read tool in the Md MCP Server, which means it retrieves data without modifying state.
Register the Md MCP server in PolicyLayer and add a rule for rescan_folder: 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 Md. Nothing to install.
rescan_folder 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 rescan_folder 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 rescan_folder. 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.
rescan_folder is provided by the Md MCP server (ly2xxx/md-mcp). 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.
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