AI agents call hash_get_all to retrieve information from Prometheus MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from a hash structure without modifying, deleting, or executing external operations. The 'get_all' operation is a standard read pattern that queries existing data. No side effects or destructive actions are possible. Low severity because the blast radius of misuse is limited to information disclosure of already-stored hash data.
From the tool's definition Tool name 'hash_get_all' and description 'Get all fields and values from hash' indicate a retrieval operation with no modification capability.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access hash_get_all gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Prometheus MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for hash_get_all:
{
"version": "1",
"default": "deny",
"tools": {
"hash_get_all": {}
}
}hash_get_all is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get all fields and values from hash. It is categorised as a Read tool in the Prometheus MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for hash_get_all: 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 Prometheus MCP Server. Nothing to install.
hash_get_all 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 hash_get_all 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 hash_get_all. 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.
hash_get_all is provided by the Prometheus MCP Server MCP server (awslabs.prometheus-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Prometheus MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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805 Prometheus MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.