List access tokens in the account.
AI agents call list_access_tokens to retrieve information from S2 StreamStore MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query to enumerate access tokens. While access tokens are sensitive credentials, the tool only lists them without creating, modifying, or deleting them. The severity is low because listing tokens does not itself enable unauthorized access—it reveals metadata about existing tokens but does not grant the ability to use those tokens or modify them.
From the tool's definition Tool name 'list_access_tokens' and description 'List access tokens in the account' indicate a query operation that retrieves existing data without modification.
Attacks that exploit this kind of access
List access tokens in the account. It is categorised as a Read tool in the S2 StreamStore MCP Server MCP Server, which means it retrieves data without modifying state.
Register the S2 StreamStore MCP Server MCP server in PolicyLayer and add a rule for list_access_tokens: 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 S2 StreamStore MCP Server. Nothing to install.
list_access_tokens 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_access_tokens 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_access_tokens. 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_access_tokens is provided by the S2 StreamStore MCP Server MCP server (s2-streamstore/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.
Teams ship this data inside their own products. See what a licence covers →