fix(graph): improve LLM tool UX for GetSubgraphTool and ReadGraphTool

server/src/tools.rs

@@ -100,6 +100,8 @@ pub struct DeleteRelationsTool {
 pub struct ReadGraphTool {
     /// Optional namespace to restrict the read to.
     pub namespace: Option<String>,
+    /// Optional entity_type to filter entities by (e.g. 'DatabaseTable').
+    pub entity_type: Option<String>,
     /// Optional token budget cap. Truncates graph outputs to fit within the specified token budget.
     pub max_tokens: Option<usize>,
     /// Optional maximum number of entities to return (pagination).
@@ -213,7 +215,7 @@ pub struct GetSubgraphTool {
     pub root_entity: Option<String>,
     /// Maximum search depth (hops). Defaults to 2.
     pub depth: Option<u32>,
-    /// Output format: 'json' (raw entities and relations) or 'markdown_tree' (compact topology tree). Defaults to 'json'.
+    /// Output format: 'json' (raw entities and relations) or 'markdown_tree' (compact topology tree). Defaults to 'markdown_tree'.
     pub format: Option<SubgraphFormat>,
     /// Optional namespace filter.
     pub namespace: Option<String>,