AI agents call generate_marble to retrieve information from Rxjs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool generates a visual representation (ASCII marble diagram) of RxJS stream behavior. It is a read/display operation with no side effects — it produces output for visualization purposes only. No data is written, executed, deleted, or transmitted. Misuse potential is minimal.
From the tool's definition Generate ASCII marble diagrams to visualize RxJS stream emissions over time
Attacks that exploit this kind of access
Generate ASCII marble diagrams to visualize RxJS stream emissions over time. It is categorised as a Read tool in the Rxjs MCP Server, which means it retrieves data without modifying state.
Register the Rxjs MCP server in PolicyLayer and add a rule for generate_marble: 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 Rxjs. Nothing to install.
generate_marble 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 generate_marble 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 generate_marble. 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.
generate_marble is provided by the Rxjs MCP server (shuji-bonji/rxjs-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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