Mcp Sqlite

Execute a SELECT query on the SQLite database and return rows as a JSON array. Use this for reading data — supports any valid SELECT statement with optional parameter binding for safe queries.

Execute a write statement (INSERT, UPDATE, DELETE, CREATE, ALTER, DROP) on the SQLite database. Returns the number of rows changed and the last inserted row ID. Use parameter binding for safe writes.

Execute multiple SQL statements in a single transaction. All statements succeed or all fail (atomic). Separate statements with semicolons. Use for migrations, seed data, or batch operations.

List all tables and views in the database with their row counts. Use this as the first step to explore an unfamiliar database. Returns table name, type (table or view), and row count.

Get the column schema of a table — column names, data types, NOT NULL constraints, default values, and primary key flags. Also returns the CREATE TABLE SQL statement.

List all indexes on a table — index name, uniqueness, origin (manual or auto-created), and whether it is a partial index.

List foreign key constraints on a table — referenced table, local and remote columns, ON UPDATE and ON DELETE actions.

Create a new table with column definitions. Each column has a name, type, and optional constraints (PRIMARY KEY, NOT NULL, UNIQUE, DEFAULT). Use ifNotExists to skip if the table already exists.

Alter an existing table — add a new column, rename a column, or rename the table. SQLite does not support dropping columns via ALTER TABLE.

Drop (delete) a table and all its data permanently. This action is irreversible. Use ifExists to avoid errors if the table does not exist.

Create an index on one or more columns to speed up queries. Optionally create a UNIQUE index to enforce uniqueness. Index name is auto-generated if not provided.

Drop (delete) an index by name. Does not affect the table data, only removes the index. Use ifExists to avoid errors if the index does not exist.

Get database metadata — file path, file size, table count, page count, page size, journal mode, WAL status, encoding, and SQLite version. Use this to understand the database state.

Optimize and compact the database file by rebuilding it. Reclaims space from deleted rows and defragments the file. Returns file size before and after. May take time on large databases.

Run PRAGMA integrity_check to verify the database is not corrupted. Returns "ok" if the database is healthy, or a list of issues found. Use after crashes or suspicious behavior.