Get the latest version of an Elixir package from Hex.pm.
AI agents call get_elixir_package 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 publicly available package version information from a public registry (Hex.pm). It has no side effects—it only fetches and returns data. No write, execute, destructive, or financial operations are possible. The blast radius of misuse is minimal; an agent could only spam requests or retrieve information about packages, causing no harm to systems or data.
From the tool's definition Tool queries package registries to 'retrieve the latest version of packages and their metadata' from Hex.pm. The name 'get_elixir_package' and description indicate a read-only query operation with no data modification, deletion, or code execution capabilities.
Attacks that exploit this kind of access
Get the latest version of an Elixir package from Hex.pm. 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_elixir_package: 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_elixir_package 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_elixir_package 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_elixir_package. 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_elixir_package 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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