Lists SSM Parameters (names only).
AI agents call list_ssm_parameters to retrieve information from AWS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves parameter names from AWS Systems Manager Parameter Store without creating, modifying, or deleting data. It is a read-only query operation. However, severity is elevated to medium because SSM parameters may contain sensitive configuration data, secrets references, or infrastructure details that could be valuable for reconnaissance or further attacks, even though the tool itself only lists names…
From the tool's definition Tool name 'list_ssm_parameters' indicates a list/query operation; description states 'Lists SSM Parameters (names only)', which is a retrieval action with no modification capability. Server description emphasizes 'read-only' access.
Attacks that exploit this kind of access
Lists SSM Parameters (names only). It is categorised as a Read tool in the AWS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AWS MCP Server MCP server in PolicyLayer and add a rule for list_ssm_parameters: 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 MCP Server. Nothing to install.
list_ssm_parameters 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_ssm_parameters 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_ssm_parameters. 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_ssm_parameters is provided by the AWS MCP Server MCP server (sergiosediq/aws-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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