Reset a sequence to a specific value or restart from 1.
AI agents use PostgreSQL_reset_sequence 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.
Resetting a sequence modifies database state by changing the next value the sequence will generate. This is a reversible write operation (the sequence can be reset again), but it carries high severity because it can cause duplicate key violations, data integrity issues, or application failures if sequence values overlap with existing IDs in dependent tables.
From the tool's definition Reset a sequence to a specific value or restart from 1
Documented attack patterns abuse exactly the kind of access PostgreSQL_reset_sequence 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_reset_sequence:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_reset_sequence": {
"limits": [
{
"counter": "postgresql_reset_sequence_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}PostgreSQL_reset_sequence 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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Reset a sequence to a specific value or restart from 1. 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_reset_sequence: 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_reset_sequence 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_reset_sequence 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_reset_sequence. 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_reset_sequence 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.