Get Nightly Recharge data which measures overnight recovery. Includes ANS charge (Autonomic Nervous System recovery status), HRV data (heart rate variability during sleep), breathing rate, and overall recovery assessment. Data from the last 28 days is available.
AI agents call get_nightly_recharge to retrieve information from Polar MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only data retrieval tool for fitness/health metrics. It queries and returns Nightly Recharge recovery data with no side effects or modifications. The 28-day historical window confirms it accesses stored data.
From the tool's definition Tool retrieves historical Nightly Recharge data including ANS charge, HRV data, breathing rate, and recovery assessment from the last 28 days. No mutation, deletion, or external execution indicated.
Attacks that exploit this kind of access
Get Nightly Recharge data which measures overnight recovery. Includes ANS charge (Autonomic Nervous System recovery status), HRV data (heart rate variability during sleep), breathing rate, and overall recovery assessment. Data from the last 28 days is available. It is categorised as a Read tool in the Polar MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Polar MCP Server MCP server in PolicyLayer and add a rule for get_nightly_recharge: 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 Polar MCP Server. Nothing to install.
get_nightly_recharge 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_nightly_recharge 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_nightly_recharge. 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_nightly_recharge is provided by the Polar MCP Server MCP server (nelsonnew/polar-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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