s4_echo_pattern

Echo a date code back. Call with code in YYYY-MM-DD form.

SERVERCrow SOURCEkh0pper/crow

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/kh0pper-crow/s4-echo-pattern.md

WHAT IT DOES

What s4_echo_pattern does on Crow

AI agents call s4_echo_pattern to retrieve information from Crow without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why s4_echo_pattern is rated Low

This is a simple input-output operation that retrieves/returns data with no side effects. It fits the Read category definition: 'retrieves or queries data; no side effects'. The severity is low because even misuse would only return echoed date strings with no harmful blast radius.

From the tool's definition Tool name is 's4_echo_pattern' and description states 'Echo a date code back. Call with code in YYYY-MM-DD form.' The function echoes back input without modifying system state, creating side effects, executing code, deleting data, or moving money.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs s4_echo_pattern safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Crow, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For s4_echo_pattern, this is the rule to start with:

s4_echo_pattern Allowed

s4_echo_pattern is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "s4_echo_pattern": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Crow, apply this rule, and every s4_echo_pattern call is checked against it from then on.

FAQ

Questions about s4_echo_pattern

What does the s4_echo_pattern tool do? +

Echo a date code back. Call with code in YYYY-MM-DD form. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on s4_echo_pattern? +

Register the Crow MCP server in PolicyLayer and add a rule for s4_echo_pattern: 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 Crow. Nothing to install.

What risk level is s4_echo_pattern? +

s4_echo_pattern is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit s4_echo_pattern? +

Yes. Add a rate_limit block to the s4_echo_pattern 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 s4_echo_pattern completely? +

Set action: deny in the PolicyLayer policy for s4_echo_pattern. 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 s4_echo_pattern? +

s4_echo_pattern is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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