get_package_releases
AI agents call get_package_releases to retrieve information from PyPI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical release/version data from PyPI—a read-only query operation with no side effects, no code execution, no data modification, and no destructive actions. The low severity reflects that misuse would only expose publicly available package version history, causing no harm to systems or data.
From the tool's definition Tool name 'get_package_releases' clearly indicates retrieval of package release information. Sibling tools on the server (get_package_info, get_package_stats, search_packages) are all read operations querying PyPI metadata.
Attacks that exploit this kind of access
get_package_releases. It is categorised as a Read tool in the PyPI MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PyPI MCP Server MCP server in PolicyLayer and add a rule for get_package_releases: 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 PyPI MCP Server. Nothing to install.
get_package_releases 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_package_releases 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_package_releases. 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_package_releases is provided by the PyPI MCP Server MCP server (jackkuo666/pypi-mcp-server). 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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