AI agents call get-file-versions to retrieve information from Nextcloud without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves version history data from Nextcloud. It performs a read-only operation that does not modify, delete, or execute anything. The only information exposed is file version history, which is generally non-sensitive metadata. The blast radius of misuse is minimal—an AI agent could only view file histories it has access to.
From the tool's definition Tool name 'get-file-versions' and description 'Get version history of a file' indicate a retrieval operation with no modification or destructive capability. Returns historical metadata about a file without side effects.
Attacks that exploit this kind of access
Get version history of a file. It is categorised as a Read tool in the Nextcloud MCP Server, which means it retrieves data without modifying state.
Register the Nextcloud MCP server in PolicyLayer and add a rule for get-file-versions: 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 Nextcloud. Nothing to install.
get-file-versions 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 get-file-versions 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 get-file-versions. 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.
get-file-versions is provided by the Nextcloud MCP server (nextcloud-mcp-server). 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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