List every archived capture of a specific URL (CDX query).
AI agents call list_versions to retrieve information from Arquivo Pt 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 archival metadata (version history) from Arquivo.pt without any side effects. It is purely informational, similar to a search or list operation. There is no capability to modify, delete, or execute code. The blast radius of misuse is minimal — an attacker could only enumerate archived versions of a URL, which is already public information in the archive.
From the tool's definition 'List every archived capture of a specific URL (CDX query)' — retrieves historical metadata about archived snapshots without modifying, deleting, or executing any operations.
Attacks that exploit this kind of access
List every archived capture of a specific URL (CDX query). It is categorised as a Read tool in the Arquivo Pt MCP Server, which means it retrieves data without modifying state.
Register the Arquivo Pt MCP server in PolicyLayer and add a rule for list_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 Arquivo Pt. Nothing to install.
list_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 list_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 list_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.
list_versions is provided by the Arquivo Pt MCP server (thaenor/arquivo-pt-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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