database_mcp_mysql/tools/
drop_database.rs

1//! MCP tool: `dropDatabase`.
2
3use std::borrow::Cow;
4
5use database_mcp_server::types::{DropDatabaseRequest, MessageResponse};
6use database_mcp_sql::Connection as _;
7use database_mcp_sql::SqlError;
8use database_mcp_sql::sanitize::{quote_ident, validate_ident};
9use rmcp::handler::server::router::tool::{AsyncTool, ToolBase};
10use rmcp::model::{ErrorData, ToolAnnotations};
11use sqlparser::dialect::MySqlDialect;
12
13use crate::MysqlHandler;
14
15/// Marker type for the `dropDatabase` MCP tool.
16pub(crate) struct DropDatabaseTool;
17
18impl DropDatabaseTool {
19    const NAME: &'static str = "dropDatabase";
20    const TITLE: &'static str = "Drop Database";
21    const DESCRIPTION: &'static str = r#"Drop an existing database from the connected server.
22
23<usecase>
24Use when:
25- Removing a database that is no longer needed
26- Cleaning up test or temporary databases
27</usecase>
28
29<examples>
30✓ "Drop the test_db database" → dropDatabase(database="test_db")
31✗ "Drop a table" → use dropTable instead
32</examples>
33
34<safety>
35IMPORTANT: This permanently deletes the database and ALL its data. This action cannot be undone.
36Cannot drop the database you are currently connected to.
37</safety>
38
39<what_it_returns>
40A confirmation message with the dropped database name.
41</what_it_returns>"#;
42}
43
44impl ToolBase for DropDatabaseTool {
45    type Parameter = DropDatabaseRequest;
46    type Output = MessageResponse;
47    type Error = ErrorData;
48
49    fn name() -> Cow<'static, str> {
50        Self::NAME.into()
51    }
52
53    fn title() -> Option<String> {
54        Some(Self::TITLE.into())
55    }
56
57    fn description() -> Option<Cow<'static, str>> {
58        Some(Self::DESCRIPTION.into())
59    }
60
61    fn annotations() -> Option<ToolAnnotations> {
62        Some(
63            ToolAnnotations::new()
64                .read_only(false)
65                .destructive(true)
66                .idempotent(false)
67                .open_world(false),
68        )
69    }
70}
71
72impl AsyncTool<MysqlHandler> for DropDatabaseTool {
73    async fn invoke(handler: &MysqlHandler, params: Self::Parameter) -> Result<Self::Output, Self::Error> {
74        Ok(handler.drop_database(params).await?)
75    }
76}
77
78impl MysqlHandler {
79    /// Drops an existing database.
80    ///
81    /// Refuses to drop the currently connected database.
82    ///
83    /// # Errors
84    ///
85    /// Returns [`SqlError::ReadOnlyViolation`] in read-only mode,
86    /// [`SqlError::InvalidIdentifier`] for invalid names,
87    /// or [`SqlError::Query`] if the target is the active database
88    /// or the backend reports an error.
89    pub async fn drop_database(
90        &self,
91        DropDatabaseRequest { database }: DropDatabaseRequest,
92    ) -> Result<MessageResponse, SqlError> {
93        if self.config.read_only {
94            return Err(SqlError::ReadOnlyViolation);
95        }
96
97        validate_ident(&database)?;
98
99        // Guard: prevent dropping the currently connected database.
100        if self.connection.default_database_name().eq_ignore_ascii_case(&database) {
101            return Err(SqlError::Query(format!(
102                "Cannot drop the currently connected database '{database}'."
103            )));
104        }
105
106        let drop_sql = format!("DROP DATABASE {}", quote_ident(&database, &MySqlDialect {}));
107        self.connection.execute(drop_sql.as_str(), None).await?;
108
109        // Evict the pool for the dropped database so stale connections
110        // are not reused.
111        self.connection.invalidate(&database).await;
112
113        Ok(MessageResponse {
114            message: format!("Database '{database}' dropped successfully."),
115        })
116    }
117}
database_mcp_mysql/tools/drop_database.rs

database_mcp_mysql/tools/
drop_database.rs
