java-mcp-sql-server
Provides an MCP server (Java 21+) that connects to relational databases via JDBC and exposes tools to list schemas/tables, inspect table structure, query table data, and execute custom SQL (optionally restricted to SELECT). Supports stdio (local launch) and HTTP/SSE (remote connection) modes.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
TLS/auth for the MCP HTTP/SSE endpoint are not documented; security likely depends on running locally/trusted networks. Authentication to the database is via username/password env vars, and no per-user authorization/scopes are described. Execution includes a potentially write-capable SQL tool when the select-only flag is disabled, so principle-of-least-privilege at the DB user is critical. Rate limits, audit logging, and structured error/code guidance are not described.
⚡ Reliability
Best When
You control the database credentials, run locally (stdio) or within a trusted network (HTTP/SSE), and mostly need read/inspection SQL capabilities for development or controlled internal use.
Avoid When
You need internet-exposed remote access, fine-grained per-user permissions, or strong reliability guarantees without additional operational hardening; also avoid when you cannot enforce SELECT-only (or can’t constrain downstream SQL execution).
Use Cases
- • Database exploration for LLM/MCP agents (schemas, tables, columns, primary keys)
- • Read-only data querying for investigation and research
- • Building agent workflows that translate user intent into SQL with controlled tool access
Not For
- • Production systems requiring strong authN/authZ, auditability, and hardened security controls out of the box
- • Write-heavy workloads or multi-tenant environments without additional network controls and least-privilege DB accounts
- • Handling sensitive regulated data without verified compliance controls
Interface
Authentication
No user-facing auth mechanism is documented for the MCP server itself; access control appears to rely on network exposure and the underlying database credentials/privileges.
Pricing
Agent Metadata
Known Gotchas
- ⚠ Potentially dangerous capability: execute_query can run non-SELECT statements when JMCP_QUERY_SELECT_ONLY=false; agents may attempt writes if tool usage is not constrained.
- ⚠ HTTP/SSE mode implies remote network access; without documented MCP-layer auth, ensure you run behind a firewall/reverse proxy with access control.
- ⚠ Credential handling is via environment variables; agents or operators must ensure secrets are not leaked through logs or misconfiguration.
Alternatives
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Scores are editorial opinions as of 2026-04-04.