AI agents call xkcd_get to retrieve information from Xkcd without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves comic data based on an input number and returns it without side effects. No data is created, modified, deleted, or executed. This is a straightforward read operation against a public API.
From the tool's definition Tool description states "Fetch a specific xkcd comic by its number" — a retrieval operation with no modification, deletion, or execution of external operations. The server context confirms it queries the official xkcd JSON API to retrieve comic data.
Attacks that exploit this kind of access
Fetch a specific xkcd comic by its number. It is categorised as a Read tool in the Xkcd MCP Server, which means it retrieves data without modifying state.
Register the Xkcd MCP server in PolicyLayer and add a rule for xkcd_get: 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 Xkcd. Nothing to install.
xkcd_get 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 xkcd_get 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 xkcd_get. 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.
xkcd_get is provided by the Xkcd MCP server (sandraschi/xkcd-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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