Check all sequences for approaching max values. Sequences (used for auto-incrementing IDs) have a maximum value — if they reach it, inserts will fail. Reports current value, max value, and usage percentage.
AI agents call sequenceHealth to retrieve information from Postgresql without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and reports diagnostic information about database sequences without side effects. It reads system metadata to monitor sequence health, which is a passive monitoring activity. The blast radius of misuse is minimal — an attacker could gain visibility into sequence configuration and usage patterns, but cannot modify data, execute arbitrary queries, or trigger destructive operations.
From the tool's definition The tool 'sequenceHealth' checks sequences for approaching max values and 'Reports current value, max value, and usage percentage' — purely observational operations with no data modification, deletion, or code execution.
Attacks that exploit this kind of access
Check all sequences for approaching max values. Sequences (used for auto-incrementing IDs) have a maximum value — if they reach it, inserts will fail. Reports current value, max value, and usage percentage. It is categorised as a Read tool in the Postgresql MCP Server, which means it retrieves data without modifying state.
Register the Postgresql MCP server in PolicyLayer and add a rule for sequenceHealth: 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 Postgresql. Nothing to install.
sequenceHealth 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 sequenceHealth 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 sequenceHealth. 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.
sequenceHealth is provided by the Postgresql MCP server (vnikhilbuddhavarapu/postgresql-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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