search_values_ch
AI agents call search_values_ch to retrieve information from Apple Health MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite empty description for this specific tool, the naming convention and context of sibling Read-category tools (get_*, search_*) strongly suggest this retrieves health data without modification. Search operations are non-destructive queries. Confidence reduced slightly due to missing explicit description, but contextual evidence is strong.
From the tool's definition Tool name 'search_values_ch' and sibling tools (get_health_summary_*, get_statistics_by_type_*, get_trend_data_*) all exhibit retrieval/query patterns. No 'create', 'update', 'delete', or 'execute' language in descriptions.
Attacks that exploit this kind of access
search_values_ch. It is categorised as a Read tool in the Apple Health MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Apple Health MCP Server MCP server in PolicyLayer and add a rule for search_values_ch: 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 Apple Health MCP Server. Nothing to install.
search_values_ch 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 search_values_ch 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 search_values_ch. 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.
search_values_ch is provided by the Apple Health MCP Server MCP server (the-momentum/apple-health-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.