PostgreSQL_create_index
AI agents use PostgreSQL_create_index to create or update resources in Postgres — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Postgres environment.
Creating an index is a reversible Write operation that modifies database schema and structure. While it has performance implications, it does not delete data and can be undone via DROP INDEX. The missing description lowers confidence slightly, but the name is sufficiently clear.
From the tool's definition Tool name 'PostgreSQL_create_index' indicates creation of a database index. The 'create' verb and context of a PostgreSQL management server align with Write operations that modify database schema.
Documented attack patterns abuse exactly the kind of access PostgreSQL_create_index gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Postgres, and nothing reaches the server without passing your rules. This is the rule we recommend for PostgreSQL_create_index:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_create_index": {
"limits": [
{
"counter": "postgresql_create_index_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}PostgreSQL_create_index stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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PostgreSQL_create_index. It is categorised as a Write tool in the Postgres MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_create_index: 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 Postgres. Nothing to install.
PostgreSQL_create_index 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 PostgreSQL_create_index 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 PostgreSQL_create_index. 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.
PostgreSQL_create_index is provided by the Postgres MCP server (mukul975/postgres-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Postgres, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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239 Postgres tools catalogued and risk-classified — across an index of 43,000+ MCP servers.