Use this as the primary tool to retrieve metric data over a specific time period. This is the core tool for monitoring and observability, allowing you to get the actual data points for a given metric.
AI agents call list_time_series to retrieve information from Observability without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
list_time_series retrieves observability/monitoring data without modifying, creating, deleting, or executing any operations. It is a pure data retrieval operation typical of observability systems, presenting no destructive or execute risk.
From the tool's definition Tool description states it "retrieve[s] metric data" and "get[s] the actual data points for a given metric" with "no side effects" implied by its read-only nature.
Attacks that exploit this kind of access
Use this as the primary tool to retrieve metric data over a specific time period. This is the core tool for monitoring and observability, allowing you to get the actual data points for a given metric. It is categorised as a Read tool in the Observability MCP Server, which means it retrieves data without modifying state.
Register the Observability MCP server in PolicyLayer and add a rule for list_time_series: 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 Observability. Nothing to install.
list_time_series 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 list_time_series 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 list_time_series. 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.
list_time_series is provided by the Observability MCP server (@google-cloud/observability-mcp). 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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