echo

THE RISK

Low Risk

Why echo needs a policy

The name 'echo' typically implies a simple passthrough or reflection of input, which would be a benign read/other operation. However, the description is empty, so we cannot confirm this. Given the low-risk nature of typical 'echo' tools and the lack of evidence of any EHR data access or modification, this is classified as Other with low severity. Confidence is low due to the empty description.

From the tool's definition Tool name is 'echo' with an empty description. No information about what the tool does is provided.

Documented attack patterns abuse exactly the kind of access echo gives an agent:

POLICY

How to control echo

PolicyLayer is an MCP gateway — it sits between your AI agents and Smart EHR MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for echo:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "echo": {
      "limits": [
        {
          "counter": "echo_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

echo gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register Smart EHR MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 6 Smart EHR MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about echo

What does the echo tool do? +

echo. It is categorised as a Other tool in the Smart EHR MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on echo? +

Register the Smart EHR MCP Server MCP server in PolicyLayer and add a rule for echo: 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 Smart EHR MCP Server. Nothing to install.

What risk level is echo? +

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

Can I rate-limit echo? +

Yes. Add a rate_limit block to the echo 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 echo completely? +

Set action: deny in the PolicyLayer policy for echo. 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 echo? +

echo is provided by the Smart EHR MCP Server MCP server (jmandel/health-record-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Smart EHR MCP Server tool call.

Start from Smart EHR MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →