<use_case> Use this tool to execute a single SQL statement against a Neon database. </use_case> <important_notes> If you have a temporary branch from a prior step, you MUST: 1. Pass the branch ID to this tool unless explicitly told otherwise 2. Tell the user that you are using the temporary branc...
Part of the Neon server.
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AI agents invoke run_sql to trigger processes or run actions in Neon. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
run_sql can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"run_sql": {
"limits": [
{
"counter": "run_sql_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Neon policy for all 22 tools.
These attack patterns abuse exactly the kind of access run_sql gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
<use_case> Use this tool to execute a single SQL statement against a Neon database. </use_case> <important_notes> If you have a temporary branch from a prior step, you MUST: 1. Pass the branch ID to this tool unless explicitly told otherwise 2. Tell the user that you are using the temporary branch with ID [branch_id] </important_notes>. It is categorised as a Execute tool in the Neon MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Neon MCP server in PolicyLayer and add a rule for run_sql: 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 Neon. Nothing to install.
run_sql is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the run_sql 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 run_sql. 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.
run_sql is provided by the Neon MCP server (@neondatabase/mcp-server-neon). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 Neon tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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