List all SIMs the authenticated user can access, grouped by team. Each SIM includes id, phone_number, status, alias (organization-pivot label), organization, type, messages_received_count, and current lock state (unlocked, or locked-by-user with expiry). The response is structured as
AI agents call list_sims to retrieve information from SimRelay 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 and queries SIM data without side effects or state changes. It returns structured metadata about SIMs accessible to the authenticated user. While the underlying SIM management system could be sensitive (SIM cards can be security-relevant), this specific tool performs only read operations.
From the tool's definition Tool name 'list_sims' and description states it 'List all SIMs the authenticated user can access' with retrieval of metadata fields (id, phone_number, status, alias, organization, type, messages_received_count, lock state).
Attacks that exploit this kind of access
List all SIMs the authenticated user can access, grouped by team. Each SIM includes id, phone_number, status, alias (organization-pivot label), organization, type, messages_received_count, and current lock state (unlocked, or locked-by-user with expiry). The response is structured as. It is categorised as a Read tool in the SimRelay MCP Server MCP Server, which means it retrieves data without modifying state.
Register the SimRelay MCP Server MCP server in PolicyLayer and add a rule for list_sims: 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 SimRelay MCP Server. Nothing to install.
list_sims 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_sims 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_sims. 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_sims is provided by the SimRelay MCP Server MCP server (simrelay/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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