Get a brief description of a Rust package
AI agents call describe_rust_package to retrieve information from MCP Package Docs Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns structured documentation metadata about a Rust package. It is a read-only operation analogous to the sibling tools (describe_go_package, describe_npm_package, etc.) on the same server, which all fetch package information. No side effects, code execution, data modification, or deletion occur.
From the tool's definition Tool name 'describe_rust_package' and description 'Get a brief description of a Rust package' indicate a retrieval operation that queries package documentation without modifying or executing anything.
Documented attack patterns abuse exactly the kind of access describe_rust_package gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Package Docs Server, and nothing reaches the server without passing your rules. This is the rule we recommend for describe_rust_package:
{
"version": "1",
"default": "deny",
"tools": {
"describe_rust_package": {}
}
}describe_rust_package is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get a brief description of a Rust package. It is categorised as a Read tool in the MCP Package Docs Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Package Docs Server MCP server in PolicyLayer and add a rule for describe_rust_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 MCP Package Docs Server. Nothing to install.
describe_rust_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 describe_rust_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 describe_rust_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.
describe_rust_package is provided by the MCP Package Docs Server MCP server (sammcj/mcp-package-docs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 MCP Package Docs Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
13 MCP Package Docs Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.