Use a dedicated read-only database role, not an application owner role.
MCP SERVER SECURITY GUIDE
PostgreSQL MCP Server Security Guide
Give AI applications database context without turning natural-language prompts into unbounded production SQL access.
A PostgreSQL MCP server can expose schema names, table structures, row data, tenant identifiers, operational records, and regulated fields. Even read-only access can leak sensitive data if prompts are broad or outputs are forwarded to external model providers.
SEARCH INTENT / BUYER CONTEXT
What enterprise teams are trying to evaluate
Searchers are assessing how to let agents inspect schemas or run read-only queries without leaking regulated database content.
GOVERNANCE PATTERN
Recommended control model
Use dedicated read-only roles, row-level security, query allowlists, statement timeouts, output-size limits, and prompt/response guardrails. Route the model call through the gateway so retrieved data and LLM usage evidence stay attributable.
CONTROL CHECKLIST
Controls to validate before production use
Apply row-level security and masking policies for tenant or regulated fields.
Restrict schemas and tables visible to the MCP server.
Log SQL text, bind parameters, row counts, actor, model route, and response handling.
Block query patterns that scan broad regulated tables without business justification.
IMPLEMENTATION NOTES
Operational review points
Read-only SQL is still high risk when the model can ask broad questions over sensitive data.
Keep production and analytics database access separated.
Pair database query logging with LLM gateway audit so investigators can reconstruct both data retrieval and model output.
FAQ
PostgreSQL MCP server questions
Is read-only PostgreSQL MCP access low risk?
No. Read-only access can still expose confidential rows, schema design, customer identifiers, and regulated fields. It should be scoped and audited like any other database integration.
What database role should an agent use?
Use a dedicated read-only role with restricted schemas, row-level security, short statement timeouts, and no administrative privileges.
ENTERPRISE MCP REVIEW
Map PostgreSQL MCP access to your gateway, provider keys, and audit requirements.
Review source-system credentials, MCP tool scope, LLM provider routing, virtual keys, guardrails, and investigation evidence with your security and platform teams.
Request enterprise review →Security, platform, AppSec, and architecture teams