PostgreSQL_seqscan_heavy_tables
Identify tables with high sequential scans that might need indexes.
This record as markdown: /tools/mukul975-postgres-mcp-server/postgresql-seqscan-heavy-tables.md
What PostgreSQL_seqscan_heavy_tables does on Postgres
AI agents call PostgreSQL_seqscan_heavy_tables to retrieve information from Postgres without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why PostgreSQL_seqscan_heavy_tables is rated Low
This tool queries PostgreSQL system catalogs and statistics to detect performance issues (sequential scans). It is a diagnostic Read operation with no side effects. The blast radius is minimal—worst case, an AI agent receives performance analysis recommendations that are informational only. The tool does not execute arbitrary code, modify data structures, or trigger external systems.
From the tool's definition Tool name contains 'Identify' and description states 'Identify tables with high sequential scans' — a diagnostic query operation that retrieves and analyzes database metadata without modifying data.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_seqscan_heavy_tables safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Postgres, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For PostgreSQL_seqscan_heavy_tables, this is the rule to start with:
PostgreSQL_seqscan_heavy_tables is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Postgres, apply this rule, and every PostgreSQL_seqscan_heavy_tables call is checked against it from then on.
Questions about PostgreSQL_seqscan_heavy_tables
Identify tables with high sequential scans that might need indexes. It is categorised as a Read tool in the Postgres MCP Server, which means it retrieves data without modifying state.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_seqscan_heavy_tables: 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_seqscan_heavy_tables 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 PostgreSQL_seqscan_heavy_tables 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_seqscan_heavy_tables. 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_seqscan_heavy_tables 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.
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