AI agents call show_user to retrieve information from Redmine MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves user information from Redmine without creating, modifying, or deleting data. It is a straightforward query operation that reads user details. The blast radius of misuse is minimal—an agent could retrieve user information that may be sensitive, but cannot perform actions that alter system state or cause irreversible changes.
From the tool's definition Tool name 'show_user' and description 'Get details of a specific user' indicate a retrieval operation with no modifications or side effects.
Documented attack patterns abuse exactly the kind of access show_user gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Redmine MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for show_user:
{
"version": "1",
"default": "deny",
"tools": {
"show_user": {}
}
}show_user is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get details of a specific user. It is categorised as a Read tool in the Redmine MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Redmine MCP Server MCP server in PolicyLayer and add a rule for show_user: 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 Redmine MCP Server. Nothing to install.
show_user 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 show_user 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 show_user. 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.
show_user is provided by the Redmine MCP Server MCP server (yonaka15/mcp-server-redmine). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Redmine MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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26 Redmine MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.