List all subnets for a given cloud provider across Spinnaker accounts. Use this to discover available subnets when configuring server groups or deployment targets. Returns JSON array of subnet objects with CIDR, availability zone, and VPC association.
Single-target operation
Part of the Spinnaker MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call list_subnets to retrieve information from Spinnaker without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though list_subnets only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
list_subnets:
rules:
- action: allowSee the full Spinnaker policy for all 37 tools.
Agents calling read-class tools like list_subnets have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
List all subnets for a given cloud provider across Spinnaker accounts. Use this to discover available subnets when configuring server groups or deployment targets. Returns JSON array of subnet objects with CIDR, availability zone, and VPC association.. It is categorised as a Read tool in the Spinnaker MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for list_subnets. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Spinnaker MCP server.
list_subnets 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_subnets rule in your Intercept 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 Intercept policy for list_subnets. 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_subnets is provided by the Spinnaker MCP server (spinnaker-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.