Get the latest version of a Perl module from CPAN.
AI agents call get_perl_module to retrieve information from Versionator without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves package metadata from a public registry without modifying data, executing code, or causing side effects. The blast radius of misuse is minimal—an agent could only spam queries or enumerate packages, posing negligible risk. It follows the standard Read category for package registry queries.
From the tool's definition Tool queries CPAN (Perl package registry) to 'get the latest version of a Perl module' and retrieve metadata. No write, delete, code execution, or financial operations are performed.
Attacks that exploit this kind of access
Get the latest version of a Perl module from CPAN. It is categorised as a Read tool in the Versionator MCP Server, which means it retrieves data without modifying state.
Register the Versionator MCP server in PolicyLayer and add a rule for get_perl_module: 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 Versionator. Nothing to install.
get_perl_module 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_perl_module 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_perl_module. 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_perl_module is provided by the Versionator MCP server (trianglegrrl/versionator-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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