AI agents call list-tables to retrieve information from MCP Firebird without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about database structure (table names) without modifying, deleting, or executing any operations. It is a read-only information lookup with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'list-tables' and description 'Lists all user tables in the current Firebird database' indicate a query/retrieval operation with no side effects.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access list-tables gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Firebird, and nothing reaches the server without passing your rules. This is the rule we recommend for list-tables:
{
"version": "1",
"default": "deny",
"tools": {
"list-tables": {}
}
}list-tables is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists all user tables in the current Firebird database. It is categorised as a Read tool in the MCP Firebird MCP Server, which means it retrieves data without modifying state.
Register the MCP Firebird MCP server in PolicyLayer and add a rule for list-tables: 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 MCP Firebird. Nothing to install.
list-tables 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-tables 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-tables. 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-tables is provided by the MCP Firebird MCP server (purodelphi/mcpfirebird). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 MCP Firebird tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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22 MCP Firebird tools catalogued and risk-classified — across an index of 42,500+ MCP servers.