Get historical telemetry data from ESP32
AI agents call get_telemetry_history to retrieve information from MCP Prompts Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical telemetry readings from an ESP32 device. It performs a read-only query operation with no side effects—no data is created, modified, deleted, or any external operations are triggered. The severity is low because telemetry data is typically non-sensitive sensor readings (temperature, humidity, etc.) and retrieval alone poses minimal risk even if misused by an AI agent.
From the tool's definition Tool name 'get_telemetry_history' and description 'Get historical telemetry data from ESP32' indicate retrieval of existing data with no modification capability.
Documented attack patterns abuse exactly the kind of access get_telemetry_history gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Prompts Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_telemetry_history:
{
"version": "1",
"default": "deny",
"tools": {
"get_telemetry_history": {}
}
}get_telemetry_history is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get historical telemetry data from ESP32. It is categorised as a Read tool in the MCP Prompts Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Prompts Server MCP server in PolicyLayer and add a rule for get_telemetry_history: 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 MCP Prompts Server. Nothing to install.
get_telemetry_history 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 get_telemetry_history 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 get_telemetry_history. 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.
get_telemetry_history is provided by the MCP Prompts Server MCP server (sparesparrow/mcp-prompts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 51 MCP Prompts Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
51 MCP Prompts Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.