AI agents call list_bases to retrieve information from Airtable MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves a list of bases without creating, modifying, or deleting any data. It has no side effects beyond information disclosure. While it reveals what bases the authenticated user can access (which could inform reconnaissance in a broader attack), the immediate impact is limited to read-only access to metadata.
From the tool's definition Tool name 'list_bases' and description 'List all accessible Airtable bases' indicate a query/retrieval operation with no modification of data.
Documented attack patterns abuse exactly the kind of access list_bases gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Airtable MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_bases:
{
"version": "1",
"default": "deny",
"tools": {
"list_bases": {}
}
}list_bases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all accessible Airtable bases. It is categorised as a Read tool in the Airtable MCP MCP Server, which means it retrieves data without modifying state.
Register the Airtable MCP server in PolicyLayer and add a rule for list_bases: 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 Airtable MCP. Nothing to install.
list_bases 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_bases 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_bases. 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_bases is provided by the Airtable MCP server (rashidazarang/airtable-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 45 Airtable MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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45 Airtable MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.