AI agents call args to retrieve information from Rr without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays function arguments from the current stack frame in a debugger context. It is a pure read operation that inspects program state without modifying, executing, or deleting anything. The severity is low as misuse would only expose potentially sensitive data already accessible within the debugging session, with no capability to alter program execution or cause destructive effects.
From the tool's definition Tool name 'args' and description 'Get function arguments for the current frame' indicate a retrieval operation with no side effects. It queries the debugger state to retrieve argument data.
Attacks that exploit this kind of access
Get function arguments for the current frame. It is categorised as a Read tool in the Rr MCP Server, which means it retrieves data without modifying state.
Register the Rr MCP server in PolicyLayer and add a rule for args: 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 Rr. Nothing to install.
args 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 args 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 args. 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.
args is provided by the Rr MCP server (jnjaeschke/rr-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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