pg_doc_create_collection
Create a new JSONB document collection (table with doc JSONB + generated _id primary key).
This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-doc-create-collection.md
What pg_doc_create_collection does on PostgreSQL MCP Server
AI agents use pg_doc_create_collection to create or update resources in PostgreSQL MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your PostgreSQL MCP Server environment.
Why pg_doc_create_collection is rated Medium
This tool creates a new table, which is a Write operation (reversible modification to database schema/structure). While table creation has schema-level impact, it is not Destructive because the table can be dropped. It is not Execute because it doesn't run arbitrary code or trigger external side effects—it performs a specific, bounded schema operation.
From the tool's definition Tool description states 'Create a new JSONB document collection (table with doc JSONB + generated _id primary key)' — the verb 'Create' and action of instantiating a new table is a reversible data structure creation operation.
Attacks that exploit this kind of access
The rule that runs pg_doc_create_collection safely
PolicyLayer is an MCP gateway: it sits between your AI agents and PostgreSQL MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pg_doc_create_collection, this is the rule to start with:
pg_doc_create_collection 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.
The button opens the PolicyLayer dashboard: create your workspace, connect PostgreSQL MCP Server, apply this rule, and every pg_doc_create_collection call is checked against it from then on.
Questions about pg_doc_create_collection
Create a new JSONB document collection (table with doc JSONB + generated _id primary key). It is categorised as a Write tool in the PostgreSQL MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_doc_create_collection: 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 MCP Server. Nothing to install.
pg_doc_create_collection 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 pg_doc_create_collection 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 pg_doc_create_collection. 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.
pg_doc_create_collection is provided by the PostgreSQL MCP Server MCP server (@neverinfamous/postgres-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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