LocalDB MCP Server
Enables AI assistants to query and interact with Microsoft SQL Server LocalDB databases, supporting operations like listing databases, querying tables, executing SQL statements, and viewing stored procedures.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
list_databasesList all databases on the LocalDB instance
connect_databaseConnect to a specific database on LocalDB
list_tablesList all tables in the current database
describe_tableGet the schema/structure of a table including columns, data types, and constraints
queryExecute a SELECT query against the database. Only SELECT statements are allowed for safety.
execute_sqlExecute any SQL statement (INSERT, UPDATE, DELETE, CREATE, ALTER, DROP, etc.). Use with caution!
database_infoGet detailed information about the current or specified database
list_stored_proceduresList all stored procedures in the database
get_procedure_definitionGet the definition/source code of a stored procedure
sample_dataGet sample rows from a table to understand its data
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
10/10 tools missing one or more hints — list_databases (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); connect_database (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_tables (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +7 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tests exist
No test files found
Add tests that exercise each declared tool.
Production dependencies are patched
0 critical, 2 high severity in production deps — @modelcontextprotocol/sdk@1.24.3 (high), @modelcontextprotocol/sdk@1.24.3 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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