Get the latest version of a Rust crate from crates.io.
AI agents call get_rust_crate 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 (version information) from a public package registry. It is a simple lookup operation with no capability to modify, execute code, delete data, or commit financial transactions. The blast radius of misuse is minimal—an agent could only retrieve information that is already public. This is a canonical Read operation.
From the tool's definition Tool name is 'get_rust_crate' and description states 'Get the latest version of a Rust crate from crates.io.' The verb 'get' and the read-only nature of querying package metadata from a public registry indicate no data modification or side effects.
Attacks that exploit this kind of access
Get the latest version of a Rust crate from crates.io. 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_rust_crate: 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_rust_crate 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_rust_crate 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_rust_crate. 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_rust_crate 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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