Improve tool description for running SQL++ queries (#82)

Author: nithishr

README.md

@@ -21,6 +21,7 @@ An [MCP](https://modelcontextprotocol.io/) server implementation of Couchbase th
 - Upsert a document by ID to a specified scope and collection
 - Delete a document by ID from a specified scope and collection
 - Run a [SQL++ query](https://www.couchbase.com/sqlplusplus/) on a specified scope
+  - Queries are automatically scoped to the specified bucket and scope, so use collection names directly (e.g., use `SELECT * FROM users` instead of `SELECT * FROM bucket.scope.users`)
   - There is an option in the MCP server, `CB_MCP_READ_ONLY_QUERY_MODE` that is set to true by default to disable running SQL++ queries that change the data or the underlying collection structure. Note that the documents can still be updated by ID.
 - Get the status of the MCP server
 - Check the cluster credentials by connecting to the cluster

src/tools/query.py

@@ -39,7 +39,15 @@ def get_schema_for_collection(
 def run_sql_plus_plus_query(
     ctx: Context, bucket_name: str, scope_name: str, query: str
 ) -> list[dict[str, Any]]:
-    """Run a SQL++ query on a scope and return the results as a list of JSON objects."""
+    """Run a SQL++ query on a scope and return the results as a list of JSON objects.
+
+    The query will be run on the specified scope in the specified bucket.
+    The query should use collection names directly without bucket/scope prefixes, as the scope context is automatically set.
+
+    Example:
+        query = "SELECT * FROM users WHERE age > 18"
+        # Incorrect: "SELECT * FROM bucket.scope.users WHERE age > 18"
+    """
     cluster = get_cluster_connection(ctx)
 
     bucket = connect_to_bucket(cluster, bucket_name)