Provision a fresh Postgres database on instanode.dev. pgvector is pre-installed. Returns a standard postgres:// connection URL that any driver can use directly as DATABASE_URL — no wrapper SDK, no setup. The 'name' field is required (the human label surfaced on the dashboard). Without INSTANODE_T...
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AI agents use create_postgres to create or modify resources in Instanode. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call create_postgres repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Instanode.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"create_postgres": {
"limits": [
{
"counter": "create_postgres_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Instanode policy for all 6 tools.
These attack patterns abuse exactly the kind of access create_postgres gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Provision a fresh Postgres database on instanode.dev. pgvector is pre-installed. Returns a standard postgres:// connection URL that any driver can use directly as DATABASE_URL — no wrapper SDK, no setup. The 'name' field is required (the human label surfaced on the dashboard). Without INSTANODE_TOKEN: free tier — 10 MB, 2 connections, expires in 24h, capped at 5 provisions/day per /24 subnet. With INSTANODE_TOKEN (paid): 500 MB, 5 connections, permanent, no subnet cap. Store the connection_url in an env var (DATABASE_URL); do not hardcode it.. It is categorised as a Write tool in the Instanode MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Instanode MCP server in PolicyLayer and add a rule for create_postgres: 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 Instanode. Nothing to install.
create_postgres is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_postgres 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 create_postgres. 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.
create_postgres is provided by the Instanode MCP server (@instanode/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Instanode tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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