substrate_simulator_tool
AI agents call substrate_simulator_tool to retrieve information from Mcp Print without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Substrate simulation (modeling how ink/color appears on different paper types) is a non-destructive information retrieval task. No side effects, no data modification, no execution of external code. Low severity due to lack of description and typical print workflow context suggesting safe offline analysis tools.
From the tool's definition Tool name 'substrate_simulator_tool' with no description provided. Given sibling tools perform color conversions, lookups, estimations, and preflight checks (all read-only operations), this tool likely simulates print substrates for analysis.
Documented attack patterns abuse exactly the kind of access substrate_simulator_tool gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Print, and nothing reaches the server without passing your rules. This is the rule we recommend for substrate_simulator_tool:
{
"version": "1",
"default": "deny",
"tools": {
"substrate_simulator_tool": {}
}
}substrate_simulator_tool is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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substrate_simulator_tool. It is categorised as a Read tool in the Mcp Print MCP Server, which means it retrieves data without modifying state.
Register the Mcp Print MCP server in PolicyLayer and add a rule for substrate_simulator_tool: 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 Mcp Print. Nothing to install.
substrate_simulator_tool 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 substrate_simulator_tool 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 substrate_simulator_tool. 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.
substrate_simulator_tool is provided by the Mcp Print MCP server (kcgdz/mcp-print). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Print, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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12 Mcp Print tools catalogued and risk-classified — across an index of 43,000+ MCP servers.