database_mcp_sqlite/tools/
list_tables.rs

1//! MCP tool: `list_tables`.
2
3use std::borrow::Cow;
4use std::sync::Arc;
5
6use database_mcp_server::AppError;
7use database_mcp_server::types::ListTablesResponse;
8use database_mcp_sql::timeout::execute_with_timeout;
9use rmcp::handler::server::common::schema_for_empty_input;
10use rmcp::handler::server::router::tool::{AsyncTool, ToolBase};
11use rmcp::model::{ErrorData, JsonObject, ToolAnnotations};
12
13use crate::SqliteHandler;
14
15/// Marker type for the `list_tables` MCP tool.
16pub(crate) struct ListTablesTool;
17
18impl ListTablesTool {
19    const NAME: &'static str = "list_tables";
20    const DESCRIPTION: &'static str = "List all tables in the connected `SQLite` database.";
21}
22
23impl ToolBase for ListTablesTool {
24    type Parameter = ();
25    type Output = ListTablesResponse;
26    type Error = ErrorData;
27
28    fn name() -> Cow<'static, str> {
29        Self::NAME.into()
30    }
31
32    fn description() -> Option<Cow<'static, str>> {
33        Some(Self::DESCRIPTION.into())
34    }
35
36    fn input_schema() -> Option<Arc<JsonObject>> {
37        Some(schema_for_empty_input())
38    }
39
40    fn annotations() -> Option<ToolAnnotations> {
41        Some(
42            ToolAnnotations::new()
43                .read_only(true)
44                .destructive(false)
45                .idempotent(true)
46                .open_world(false),
47        )
48    }
49}
50
51impl AsyncTool<SqliteHandler> for ListTablesTool {
52    async fn invoke(handler: &SqliteHandler, _params: Self::Parameter) -> Result<Self::Output, Self::Error> {
53        Ok(handler.list_tables().await?)
54    }
55}
56
57impl SqliteHandler {
58    /// Lists all tables in the connected database.
59    ///
60    /// # Errors
61    ///
62    /// Returns [`AppError`] if the query fails.
63    pub async fn list_tables(&self) -> Result<ListTablesResponse, AppError> {
64        let pool = self.pool.clone();
65        let sql = "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%' ORDER BY name";
66        let rows: Vec<(String,)> =
67            execute_with_timeout(self.config.query_timeout, sql, sqlx::query_as(sql).fetch_all(&pool)).await?;
68        Ok(ListTablesResponse {
69            tables: rows.into_iter().map(|r| r.0).collect(),
70        })
71    }
72}
database_mcp_sqlite/tools/list_tables.rs

database_mcp_sqlite/tools/
list_tables.rs
