AI agents call listarTablas to retrieve information from MyPos MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema metadata (table names) from the database. It performs a read-only query operation analogous to querying information_schema or pg_tables, with no capability to modify, delete, or execute arbitrary operations. The minimal blast radius and read-only nature justify low severity.
From the tool's definition Tool name 'listarTablas' (list tables) and server description stating it allows users to 'list tables' indicates a retrieval operation with no side effects.
Attacks that exploit this kind of access
Sigue estas reglas para listar tablas:\n. It is categorised as a Read tool in the MyPos MCP MCP Server, which means it retrieves data without modifying state.
Register the MyPos MCP server in PolicyLayer and add a rule for listarTablas: 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 MyPos MCP. Nothing to install.
listarTablas 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 listarTablas 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 listarTablas. 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.
listarTablas is provided by the MyPos MCP server (yonsn76/mypos-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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