Retrieve a list of all AWS regions. Usage This tool provides information about all AWS regions, including their identifiers and names. When to Use - When planning global infrastructure deployments - To validate region codes for other API calls - To get a complete AWS regional inventory Result Int...
Part of the AWS Docs and Regions server.
Free to start. No card required.
AI agents call aws___list_regions to retrieve information from AWS Docs and Regions 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 aws___list_regions 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.
{
"version": "1",
"default": "deny",
"tools": {
"aws___list_regions": {}
}
}See the full AWS Docs and Regions policy for all 5 tools.
These attack patterns abuse exactly the kind of access aws___list_regions gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Retrieve a list of all AWS regions. Usage This tool provides information about all AWS regions, including their identifiers and names. When to Use - When planning global infrastructure deployments - To validate region codes for other API calls - To get a complete AWS regional inventory Result Interpretation Each region result includes: - region_id: The unique region code (e.g., 'us-east-1') - region_long_name: The human-friendly name (e.g., 'US East (N. Virginia)') Common Use Cases 1. Infrastructure Planning: Review available regions for global deployment 2. Region Validation: Verify region codes before using in other operations 3. Regional Inventory: Get a complete list of AWS's global infrastructure. It is categorised as a Read tool in the AWS Docs and Regions MCP Server, which means it retrieves data without modifying state.
Register the AWS Docs and Regions MCP server in PolicyLayer and add a rule for aws___list_regions: 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 AWS Docs and Regions. Nothing to install.
aws___list_regions 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 aws___list_regions 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 aws___list_regions. 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.
aws___list_regions is provided by the AWS Docs and Regions MCP server (FaresYoussef94/aws-knowledge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 AWS Docs and Regions tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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