sqlens-mcp
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| DEVDB_URL | No | Database URL for the default connection. Supports postgres://, mysql://, sqlite:// or .db/.sqlite path. Example: postgres://localhost/myapp |
Instructions
Guidance the server publishes about itself, which clients place ahead of the tool catalog so the model reads it before choosing anything.
This server publishes no instructions, or was last inspected before Glama recorded them.
Capabilities
Features and capabilities supported by this server
Protocol revision2025-11-25
| Capability | Details |
|---|---|
| tools | {
"listChanged": true
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| list_connectionsA | List all configured database connections and their dialects. Call this first to see what databases are available. |
| list_tablesA | List all tables and views in a database with row counts and sizes. |
| describe_tableA | Show columns (types, nullability, defaults, primary keys), indexes, and foreign keys for a table or view. |
| run_queryA | Execute a read-only SELECT query and return results as a formatted table. Only SELECT and WITH statements are permitted. |
| explain_queryA | Run EXPLAIN ANALYZE (Postgres) or EXPLAIN (MySQL/SQLite) on a SELECT query to show the execution plan. Useful for diagnosing slow queries. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
TDQS
Scored across 5 tools
Each tool has a distinct purpose: schema description, query explanation, connection listing, table metadata, and query execution. No overlapping functionality.
All tool names follow a consistent verb_noun pattern in snake_case (e.g., describe_table, list_tables). No deviations.
5 tools is well-scoped for a SQL analysis server, covering essential database introspection and querying operations without excess.
The tool set provides a complete surface for read-only SQL analysis: schema exploration, query execution, execution plans, and connection management. No obvious gaps.