Low Risk

get_prompts

Returns task-specific Layer 2 prompts for a given template and task type. These are ready-to-use prompts for common modeling tasks.

Part of the Hemrock MCP server.

get_prompts is read-only, but an agent in a loop can still rack up calls and cost. PolicyLayer caps every call before it runs. Live in minutes.

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AI agents call get_prompts to retrieve information from Hemrock MCP without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.

Even though get_prompts only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.

Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_prompts": {}
  }
}

See the full Hemrock MCP policy for all 6 tools.

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These attack patterns abuse exactly the kind of access get_prompts gives an agent. Each links to the full case and the policy that stops it:

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Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so get_prompts only ever does what you allow.

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Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.

What does the get_prompts tool do? +

Returns task-specific Layer 2 prompts for a given template and task type. These are ready-to-use prompts for common modeling tasks.. It is categorised as a Read tool in the Hemrock MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_prompts? +

Register the Hemrock MCP server in PolicyLayer and add a rule for get_prompts: 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 Hemrock MCP. Nothing to install.

What risk level is get_prompts? +

get_prompts is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_prompts? +

Yes. Add a rate_limit block to the get_prompts 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.

How do I block get_prompts completely? +

Set action: deny in the PolicyLayer policy for get_prompts. 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.

What MCP server provides get_prompts? +

get_prompts is provided by the Hemrock MCP server (https://mcp.hemrock.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Hemrock MCP tool call.

Deterministic rules across all 6 Hemrock MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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