AI agents call get_activity_splits to retrieve information from Rewind without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical data about a running activity (pace, elevation, heart rate metrics) without modifying, creating, or deleting any data. It is a straightforward data query operation similar to other 'get_*' tools on the server (get_activity_details, get_artist_details, etc.). The blast radius of misuse is minimal—an attacker gains visibility into personal fitness data but cannot modify or delete it.
From the tool's definition Tool description states 'Get per-mile splits for a running activity. Shows pace, elevation, and heart rate for each mile.' The verb 'Get' and the read-only nature of retrieving activity metrics indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get per-mile splits for a running activity. Shows pace, elevation, and heart rate for each mile. Get the activity ID from get_recent_runs. It is categorised as a Read tool in the Rewind MCP Server, which means it retrieves data without modifying state.
Register the Rewind MCP server in PolicyLayer and add a rule for get_activity_splits: 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 Rewind. Nothing to install.
get_activity_splits 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_activity_splits 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_activity_splits. 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_activity_splits is provided by the Rewind MCP server (rewind-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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