Get Nightly Recharge data for a date range. Returns ANS charge, HRV, breathing rate, and recovery assessment for each night in the range.
AI agents call get_nightly_recharge_range 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 tool retrieves historical fitness and recovery data within a specified date range. It performs a query operation with no capacity to modify, delete, or execute external operations. While the data is personal health information (sensitive in terms of privacy), the tool itself has no destructive capability and poses minimal risk if called by an AI agent.
From the tool's definition Tool name 'get_nightly_recharge_range' and description 'Get Nightly Recharge data for a date range' indicate data retrieval with no modification or side effects. Returns ANS charge, HRV, breathing rate, and recovery assessment—all read-only health metrics.
Attacks that exploit this kind of access
Get Nightly Recharge data for a date range. Returns ANS charge, HRV, breathing rate, and recovery assessment for each night in the range. 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_range: 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_range 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_range 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_range. 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_range 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.
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