AI agents call get_on_this_day 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 information from the Rewind personal data API. The 'get_' prefix and its placement among similar retrieval tools (get_activity_details, get_article, get_attended_events) strongly indicate a read-only query operation. No side effects, modifications, deletions, or external operations are suggested. The incomplete description reduces confidence slightly but does not change the category.
From the tool's definition Tool name 'get_on_this_day' and context of sibling 'get_' prefix tools (get_activity_details, get_article, get_artist_details, get_attended_event, etc.) all indicate retrieval operations.
Attacks that exploit this kind of access
Get historical. 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_on_this_day: 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_on_this_day 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_on_this_day 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_on_this_day. 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_on_this_day 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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