Decode a raw METAR string into human-readable format
AI agents call decode-metar to retrieve information from Aviation Weather MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool takes an existing METAR (aviation weather) string and converts it into a more human-readable format. It performs a read-only transformation—parsing and reformatting data without modifying, creating, deleting, executing arbitrary code, or triggering external actions. No blast radius from misuse beyond potentially confusing output to an end user.
From the tool's definition Tool name 'decode-metar' and description 'Decode a raw METAR string into human-readable format' indicate a data transformation operation on provided input with no side effects, state changes, or external operations triggered.
Documented attack patterns abuse exactly the kind of access decode-metar gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Aviation Weather MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for decode-metar:
{
"version": "1",
"default": "deny",
"tools": {
"decode-metar": {}
}
}decode-metar is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Decode a raw METAR string into human-readable format. It is categorised as a Read tool in the Aviation Weather MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Aviation Weather MCP Server MCP server in PolicyLayer and add a rule for decode-metar: 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 Aviation Weather MCP Server. Nothing to install.
decode-metar 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 decode-metar 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 decode-metar. 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.
decode-metar is provided by the Aviation Weather MCP Server MCP server (zealoushacker/aviation-weather-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Aviation Weather MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
10 Aviation Weather MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.