PostgreSQL_list_sequences
List all sequences in a schema.
This record as markdown: /tools/mukul975-postgres-mcp-server/postgresql-list-sequences.md
What PostgreSQL_list_sequences does on Postgres
AI agents call PostgreSQL_list_sequences 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_list_sequences is rated Low
This tool retrieves schema metadata (sequences) from PostgreSQL without side effects. It is a read-only operation analogous to SELECT from system catalogs. No data is modified, deleted, or executed. The blast radius of misuse is minimal — at worst, an agent learns about sequence names and properties in the database.
From the tool's definition Tool name contains 'list' and description states 'List all sequences in a schema' — a straightforward query operation that retrieves metadata without modifying or executing code.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_list_sequences 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_list_sequences, this is the rule to start with:
PostgreSQL_list_sequences 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_list_sequences call is checked against it from then on.
Questions about PostgreSQL_list_sequences
List all sequences in a schema. 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_list_sequences: 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_list_sequences 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_list_sequences 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_list_sequences. 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_list_sequences 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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