add realistic root knowledge mode to treetest

treetest/src/app/mod.rs

@@ -11,7 +11,11 @@ use crossterm::{
 };
 use ratatui::DefaultTerminal;
 
-use crate::{model::Selection, scenarios::built_in_scenarios, sim::Simulation};
+use crate::{
+    model::{NodeId, Selection},
+    scenarios::built_in_scenarios,
+    sim::Simulation,
+};
 
 /// Errors returned by the TUI application.
 #[derive(Debug, thiserror::Error)]
@@ -113,6 +117,21 @@ impl App {
             KeyCode::Char('d') => self.perform_chat_data()?,
             KeyCode::Char('b') => self.perform_chat_bye()?,
             KeyCode::Char('f') => self.perform_invalid_fault_demo()?,
+            KeyCode::Char('g') => {
+                self.simulation.toggle_inspector_mode();
+                self.refresh_selections(Some(self.selected().node_id()));
+                self.status = if self.simulation.is_realistic_mode() {
+                    "Inspector switched to realistic mode.".to_owned()
+                } else {
+                    "Inspector switched to ground truth mode.".to_owned()
+                };
+            }
+            KeyCode::Char('m') => {
+                self.simulation.enable_realistic_mode_with_memory_reset();
+                self.refresh_selections(Some(NodeId(0)));
+                self.status =
+                    "Cleared root memory for deeper nodes and enabled realistic mode.".to_owned();
+            }
             KeyCode::Char('s') => {
                 let processed = self.simulation.step()?;
                 self.status = if processed {
@@ -133,12 +152,7 @@ impl App {
     fn load_scenario(&mut self, index: usize) -> Result<(), AppError> {
         self.scenario_index = index;
         self.simulation = Simulation::new(self.scenarios[index].clone())?;
-        self.selections = ui::build_selections(&self.simulation);
+        self.refresh_selections(Some(self.simulation.initial_selection().node_id()));
-        self.selection_index = self
-            .selections
-            .iter()
-            .position(|selection| *selection == self.simulation.initial_selection())
-            .unwrap_or(0);
         self.status = format!("Loaded scenario: {}", self.scenarios[index].name);
         Ok(())
     }
@@ -152,6 +166,7 @@ impl App {
             Selection::Node(node_id) => {
                 let result = self.simulation.call_endpoint_introspection(node_id)?;
                 let steps = self.simulation.drain()?;
+                self.refresh_selections(Some(node_id));
                 self.status = format!("{} ({steps} steps)", result.label);
             }
             Selection::Leaf { node_id, leaf_name } => {
@@ -159,6 +174,7 @@ impl App {
                     .simulation
                     .call_leaf_introspection(node_id, &leaf_name)?;
                 let steps = self.simulation.drain()?;
+                self.refresh_selections(Some(node_id));
                 self.status = format!("{} ({steps} steps)", result.label);
             }
         }
@@ -171,6 +187,7 @@ impl App {
                 self.simulation
                     .call_echo_leaf(node_id, &leaf_name, "demo echo from root")?;
             let steps = self.simulation.drain()?;
+            self.refresh_selections(Some(node_id));
             self.status = format!("{} ({steps} steps)", result.label);
         } else {
             self.status = "Select a leaf first, then press e.".to_owned();
@@ -193,6 +210,7 @@ impl App {
                     b"ping".to_vec(),
                 )?;
                 let steps = self.simulation.drain()?;
+                self.refresh_selections(Some(node_id));
                 self.status = format!("{} ({steps} steps)", result.label);
             } else {
                 self.status = "Selected node has no endpoint procedures.".to_owned();
@@ -222,6 +240,7 @@ impl App {
                     b"chunk please".to_vec(),
                 )?;
                 let steps = self.simulation.drain()?;
+                self.refresh_selections(Some(node_id));
                 self.status = format!("{} ({steps} steps)", result.label);
             } else {
                 self.status = "Selected node has no chunked procedure.".to_owned();
@@ -248,6 +267,7 @@ impl App {
                     b"open chat".to_vec(),
                 )?;
                 let steps = self.simulation.drain()?;
+                self.refresh_selections(Some(node_id));
                 self.status = format!("{} ({steps} steps)", result.label);
             } else {
                 self.status = "Selected node has no chat procedure.".to_owned();
@@ -264,6 +284,7 @@ impl App {
                 self.simulation
                     .send_root_hook_data(hook_id, "hello from the root", false)?;
             let steps = self.simulation.drain()?;
+            self.refresh_selections(None);
             self.status = format!("{} ({steps} steps)", result.label);
         } else {
             self.status = "No known hook yet. Press h to open chat first.".to_owned();
@@ -275,6 +296,7 @@ impl App {
         if let Some(hook_id) = self.simulation.hook_ids().last().copied() {
             let result = self.simulation.send_root_hook_data(hook_id, "bye", true)?;
             let steps = self.simulation.drain()?;
+            self.refresh_selections(None);
             self.status = format!("{} ({steps} steps)", result.label);
         } else {
             self.status = "No known hook yet. Press h to open chat first.".to_owned();
@@ -284,9 +306,9 @@ impl App {
 
     fn perform_invalid_fault_demo(&mut self) -> Result<(), AppError> {
         if let Some(hook_id) = self.simulation.hook_ids().last().copied() {
-            let root_id = crate::model::NodeId(0);
+            let root_id = NodeId(0);
             if self.simulation.tree.nodes.len() > 1 {
-                let attacker = crate::model::NodeId(1);
+                let attacker = NodeId(1);
                 let result = self.simulation.inject_invalid_peer_data(
                     attacker,
                     root_id,
@@ -295,6 +317,7 @@ impl App {
                     "spoofed data",
                 )?;
                 let steps = self.simulation.drain()?;
+                self.refresh_selections(None);
                 self.status = format!("{} ({steps} steps)", result.label);
             } else {
                 self.status =
@@ -305,4 +328,14 @@ impl App {
         }
         Ok(())
     }
+
+    fn refresh_selections(&mut self, preferred_node: Option<NodeId>) {
+        let current = preferred_node.unwrap_or_else(|| self.selected().node_id());
+        self.selections = ui::build_selections(&self.simulation);
+        self.selection_index = self
+            .selections
+            .iter()
+            .position(|selection| selection.node_id() == current)
+            .unwrap_or(0);
+    }
 }

treetest/src/app/ui.rs

@@ -9,8 +9,8 @@ use ratatui::{
 };
 
 use crate::{
-    model::{Selection, format_path},
+    model::{Selection, format_hook_ref, format_leaf_ref, format_path},
-    sim::{RecordedEvent, Simulation},
+    sim::{InspectorMode, RecordedEvent, Simulation},
 };
 
 use super::App;
@@ -32,11 +32,16 @@ impl App {
     }
 
     fn render_header(&self, frame: &mut Frame<'_>, area: Rect) {
+        let mode = match self.simulation.inspector_mode {
+            InspectorMode::GroundTruth => "ground truth",
+            InspectorMode::Realistic => "realistic",
+        };
         let title = format!(
-            "treetest | scenario {} / {}: {}",
+            "treetest | scenario {} / {}: {} | {}",
             self.scenario_index + 1,
             self.scenarios.len(),
-            self.scenarios[self.scenario_index].name
+            self.scenarios[self.scenario_index].name,
+            mode
         );
         frame.render_widget(
             Paragraph::new(title).block(Block::default().borders(Borders::ALL).title("Scenario")),
@@ -107,18 +112,15 @@ impl App {
                             node.display_path()
                         )
                     }
-                    Selection::Leaf { node_id, leaf_name } => {
+                    Selection::Leaf { node_id, leaf_name } => format!(
-                        format!(
+                        "{} {}",
-                            "{} {} :: {}",
                         if index == self.selection_index {
                             ">"
                         } else {
                             " "
                         },
-                            self.simulation.node(*node_id).display_path(),
+                        format_leaf_ref(&self.simulation.node(*node_id).path, leaf_name)
-                            leaf_name
+                    ),
-                        )
-                    }
                 };
                 ListItem::new(label)
             })
@@ -131,7 +133,21 @@ impl App {
 
     fn render_inspector(&self, frame: &mut Frame<'_>, area: Rect) {
         let selection = self.selected();
-        let body = match selection {
+        let body = match self.simulation.inspector_mode {
+            InspectorMode::GroundTruth => self.render_ground_truth_inspector(selection),
+            InspectorMode::Realistic => self.render_realistic_inspector(selection),
+        };
+
+        frame.render_widget(
+            Paragraph::new(body)
+                .block(Block::default().borders(Borders::ALL).title("Inspector"))
+                .wrap(Wrap { trim: true }),
+            area,
+        );
+    }
+
+    fn render_ground_truth_inspector(&self, selection: &Selection) -> Text<'static> {
+        match selection {
             Selection::Node(node_id) => {
                 let node = self.simulation.node(*node_id);
                 let mut lines = vec![
@@ -147,16 +163,15 @@ impl App {
                     Line::default(),
                     Line::from("Endpoint procedures:"),
                 ];
-                lines.extend(
+                lines.extend(node.endpoint_procedures.iter().map(|procedure| {
-                    node.endpoint_procedures
+                    Line::from(format!(
-                        .iter()
+                        "- {}: {}",
-                        .map(|procedure| Line::from(format!("- {}", procedure.procedure_id))),
+                        procedure.procedure_id, procedure.description
-                );
+                    ))
-                lines.extend(
+                }));
-                    node.leaves
+                lines.extend(node.leaves.iter().map(|leaf| {
-                        .iter()
+                    Line::from(format!("- {}", format_leaf_ref(&node.path, &leaf.name)))
-                        .map(|leaf| Line::from(format!("- leaf {}", leaf.name))),
+                }));
-                );
                 Text::from(lines)
             }
             Selection::Leaf { node_id, leaf_name } => {
@@ -166,21 +181,118 @@ impl App {
                     .iter()
                     .find(|leaf| &leaf.name == leaf_name)
                     .expect("selection should stay valid");
-                Text::from(vec![
+                let mut lines = vec![
-                    Line::from(format!("Leaf {}", leaf.name)).bold(),
+                    Line::from(format_leaf_ref(&node.path, &leaf.name)).bold(),
                     Line::from(leaf.description.clone()),
                     Line::from(format!("Node: {}", node.display_path())),
-                    Line::from(format!("Procedures: {}", leaf.procedures.join(", "))),
+                    Line::from("Procedures:"),
+                ];
+                lines.extend(
+                    leaf.procedures
+                        .iter()
+                        .map(|procedure| Line::from(format!("- {}", procedure))),
+                );
+                Text::from(lines)
+            }
+        }
+    }
+
+    fn render_realistic_inspector(&self, selection: &Selection) -> Text<'static> {
+        match selection {
+            Selection::Node(node_id) => {
+                let node = self.simulation.node(*node_id);
+                if let Some(learned) = self.simulation.root_knowledge.node(&node.path) {
+                    let mut lines = vec![
+                        Line::from(learned.title.clone().unwrap_or_else(|| node.display_path()))
+                            .bold(),
+                        Line::from(
+                            learned
+                                .description
+                                .clone()
+                                .unwrap_or_else(|| "No learned description yet.".to_owned()),
+                        ),
+                        Line::from(format!("Path: {}", format_path(&learned.path))),
+                        Line::from(format!("Known direct child: {}", learned.direct_child)),
+                        Line::from(format!(
+                            "Endpoint introspected: {}",
+                            learned.endpoint_introspected
+                        )),
+                        Line::default(),
+                        Line::from("Known endpoint procedures:"),
+                    ];
+                    if learned.endpoint_procedures.is_empty() {
+                        lines.push(Line::from("- none learned"));
+                    } else {
+                        lines.extend(learned.endpoint_procedures.iter().map(|procedure| {
+                            Line::from(match &procedure.description {
+                                Some(description) => {
+                                    format!("- {}: {}", procedure.procedure_id, description)
+                                }
+                                None => format!("- {}", procedure.procedure_id),
+                            })
+                        }));
+                    }
+                    lines.push(Line::default());
+                    lines.push(Line::from("Known leaves:"));
+                    if learned.leaves.is_empty() {
+                        lines.push(Line::from("- none learned"));
+                    } else {
+                        lines.extend(learned.leaves.iter().map(|leaf| {
+                            Line::from(format!(
+                                "- {}",
+                                format_leaf_ref(&learned.path, &leaf.leaf_name)
+                            ))
+                        }));
+                    }
+                    Text::from(lines)
+                } else {
+                    Text::from(vec![
+                        Line::from(node.display_path()).bold(),
+                        Line::from(
+                            "The root host has not learned anything about this endpoint yet.",
+                        ),
                     ])
                 }
-        };
+            }
-
+            Selection::Leaf { node_id, leaf_name } => {
-        frame.render_widget(
+                let node = self.simulation.node(*node_id);
-            Paragraph::new(body)
+                if let Some(learned) = self.simulation.root_knowledge.node(&node.path)
-                .block(Block::default().borders(Borders::ALL).title("Inspector"))
+                    && let Some(leaf) = learned
-                .wrap(Wrap { trim: true }),
+                        .leaves
-            area,
+                        .iter()
-        );
+                        .find(|leaf| &leaf.leaf_name == leaf_name)
+                {
+                    let mut lines = vec![
+                        Line::from(format_leaf_ref(&node.path, &leaf.leaf_name)).bold(),
+                        Line::from(
+                            leaf.description
+                                .clone()
+                                .unwrap_or_else(|| "No learned description yet.".to_owned()),
+                        ),
+                        Line::from(format!("Node: {}", node.display_path())),
+                        Line::from("Known procedures:"),
+                    ];
+                    if leaf.procedures.is_empty() {
+                        lines.push(Line::from("- none learned"));
+                    } else {
+                        lines.extend(leaf.procedures.iter().map(|procedure| {
+                            Line::from(match &procedure.description {
+                                Some(description) => {
+                                    format!("- {}: {}", procedure.procedure_id, description)
+                                }
+                                None => format!("- {}", procedure.procedure_id),
+                            })
+                        }));
+                    }
+                    Text::from(lines)
+                } else {
+                    Text::from(vec![
+                        Line::from(format_leaf_ref(&node.path, leaf_name)).bold(),
+                        Line::from("The root host has not learned this leaf yet."),
+                    ])
+                }
+            }
+        }
     }
 
     fn render_trace(&self, frame: &mut Frame<'_>, area: Rect) {
@@ -211,9 +323,8 @@ impl App {
             .map(|hook| {
                 let status = if hook.closed { "closed" } else { "open" };
                 ListItem::new(format!(
-                    "#{} {} -> {} [{}] {}",
+                    "{} -> {} [{}] {}",
-                    hook.hook_id,
+                    format_hook_ref(&hook.host_path, hook.hook_id),
-                    format_path(&hook.host_path),
                     format_path(&hook.peer_path),
                     status,
                     hook.last_message,
@@ -230,7 +341,7 @@ impl App {
         let help = vec![
             Line::from(self.status.clone()).style(Style::default().add_modifier(Modifier::BOLD)),
             Line::from(
-                "Keys: arrows move selection/scenario | i introspect | e echo leaf | p ping | c chunked | h open chat | d chat data | b chat bye | f invalid peer | s step | a autoplay | q quit",
+                "Keys: arrows move selection/scenario | i introspect | e echo leaf | p ping | c chunked | h open chat | d chat data | b chat bye | f invalid peer | g toggle ground-truth/realistic | m clear deeper memory + realistic | s step | a autoplay | q quit",
             ),
             Line::from(format!(
                 "Current selection: {}",
@@ -276,8 +387,21 @@ impl App {
 
 pub(super) fn build_selections(simulation: &Simulation) -> Vec<Selection> {
     let mut selections = Vec::new();
-    for node in &simulation.tree.nodes {
+    let node_ids: Vec<_> = match simulation.inspector_mode {
+        InspectorMode::GroundTruth => simulation.tree.nodes.iter().map(|node| node.id).collect(),
+        InspectorMode::Realistic => simulation
+            .root_knowledge
+            .known_paths()
+            .into_iter()
+            .filter_map(|path| simulation.tree.find_by_path(&path))
+            .collect(),
+    };
+
+    for node_id in node_ids {
+        let node = simulation.node(node_id);
         selections.push(Selection::Node(node.id));
+        match simulation.inspector_mode {
+            InspectorMode::GroundTruth => {
                 for leaf in &node.leaves {
                     selections.push(Selection::Leaf {
                         node_id: node.id,
@@ -285,5 +409,17 @@ pub(super) fn build_selections(simulation: &Simulation) -> Vec<Selection> {
                     });
                 }
             }
+            InspectorMode::Realistic => {
+                if let Some(learned) = simulation.root_knowledge.node(&node.path) {
+                    for leaf in &learned.leaves {
+                        selections.push(Selection::Leaf {
+                            node_id: node.id,
+                            leaf_name: leaf.leaf_name.clone(),
+                        });
+                    }
+                }
+            }
+        }
+    }
     selections
 }

treetest/src/model.rs

@@ -182,3 +182,13 @@ pub fn format_path(path: &[String]) -> String {
         format!("/{}", path.join("/"))
     }
 }
+
+/// Formats a leaf reference using the protocol document's descriptive syntax.
+pub fn format_leaf_ref(path: &[String], leaf_name: &str) -> String {
+    format!("{} {{ leaf: {} }}", format_path(path), leaf_name)
+}
+
+/// Formats a hook reference using the protocol document's descriptive syntax.
+pub fn format_hook_ref(path: &[String], hook_id: u64) -> String {
+    format!("{} {{ hook: {} }}", format_path(path), hook_id)
+}

treetest/src/sim.rs

@@ -12,14 +12,55 @@ use unshell::protocol::tree::{
     ChildRoute, ConnectionState, Endpoint, Ingress, LeafBehavior, LocalEvent, ProtocolEndpoint,
 };
 use unshell::protocol::{
-    CallMessage, DataMessage, FaultMessage, FrameBytes, PacketHeader, PacketType, decode_frame,
+    CallMessage, DataMessage, EndpointIntrospection, FaultMessage, FrameBytes, LeafIntrospection,
+    PacketHeader, PacketType, decode_frame, deserialize_archived_bytes,
 };
 
 use crate::model::{
     DemoTree, EndpointProcedureKind, EndpointProcedureSpec, LeafKind, NodeId, ScenarioDefinition,
-    Selection, format_path,
+    Selection, format_hook_ref, format_leaf_ref, format_path,
 };
 
+/// Root inspector mode.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum InspectorMode {
+    GroundTruth,
+    Realistic,
+}
+
+/// Learned procedure metadata stored by the root host.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct LearnedProcedure {
+    pub procedure_id: String,
+    pub description: Option<String>,
+}
+
+/// Learned leaf metadata stored by the root host.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct LearnedLeaf {
+    pub leaf_name: String,
+    pub description: Option<String>,
+    pub procedures: Vec<LearnedProcedure>,
+}
+
+/// Learned endpoint metadata stored by the root host.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct LearnedNode {
+    pub path: Vec<String>,
+    pub title: Option<String>,
+    pub description: Option<String>,
+    pub direct_child: bool,
+    pub endpoint_procedures: Vec<LearnedProcedure>,
+    pub leaves: Vec<LearnedLeaf>,
+    pub endpoint_introspected: bool,
+}
+
+/// Root-host knowledge accumulated from local configuration and observed traffic.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct RootKnowledge {
+    pub nodes: BTreeMap<Vec<String>, LearnedNode>,
+}
+
 /// User-facing outcome of a root-originated action.
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct ActionResult {
@@ -34,6 +75,7 @@ pub struct HookSnapshot {
     pub host_path: Vec<String>,
     pub peer_path: Vec<String>,
     pub procedure_id: String,
+    pub target_leaf: Option<String>,
     pub closed: bool,
     pub last_message: String,
 }
@@ -121,9 +163,208 @@ pub struct Simulation {
     pub trace: VecDeque<TraceEvent>,
     pub recorded_events: Vec<RecordedEvent>,
     pub hooks: BTreeMap<u64, HookSnapshot>,
+    pub inspector_mode: InspectorMode,
+    pub root_knowledge: RootKnowledge,
     chat_sessions: BTreeMap<u64, ChatSession>,
 }
 
+impl RootKnowledge {
+    fn new(tree: &DemoTree) -> Self {
+        let mut knowledge = Self {
+            nodes: BTreeMap::new(),
+        };
+        for node in &tree.nodes {
+            if node.path.is_empty() || node.path.len() == 1 {
+                let direct_child = node.path.len() == 1;
+                let mut learned = LearnedNode {
+                    path: node.path.clone(),
+                    title: Some(node.title.clone()),
+                    description: Some(node.description.clone()),
+                    direct_child,
+                    endpoint_procedures: Vec::new(),
+                    leaves: Vec::new(),
+                    endpoint_introspected: node.path.is_empty(),
+                };
+
+                if node.path.is_empty() {
+                    learned.endpoint_procedures = node
+                        .endpoint_procedures
+                        .iter()
+                        .map(|procedure| LearnedProcedure {
+                            procedure_id: procedure.procedure_id.clone(),
+                            description: Some(procedure.description.clone()),
+                        })
+                        .collect();
+                    learned.leaves = node
+                        .leaves
+                        .iter()
+                        .map(|leaf| LearnedLeaf {
+                            leaf_name: leaf.name.clone(),
+                            description: Some(leaf.description.clone()),
+                            procedures: leaf
+                                .procedures
+                                .iter()
+                                .map(|procedure_id| LearnedProcedure {
+                                    procedure_id: procedure_id.clone(),
+                                    description: Some(leaf.description.clone()),
+                                })
+                                .collect(),
+                        })
+                        .collect();
+                }
+
+                knowledge.nodes.insert(node.path.clone(), learned);
+            }
+        }
+        knowledge
+    }
+
+    fn ensure_node(&mut self, demo_node: &crate::model::DemoNode) -> &mut LearnedNode {
+        let direct_child = demo_node.path.len() == 1;
+        self.nodes
+            .entry(demo_node.path.clone())
+            .or_insert_with(|| LearnedNode {
+                path: demo_node.path.clone(),
+                title: Some(demo_node.title.clone()),
+                description: Some(demo_node.description.clone()),
+                direct_child,
+                endpoint_procedures: Vec::new(),
+                leaves: Vec::new(),
+                endpoint_introspected: false,
+            })
+    }
+
+    fn remember_endpoint_procedure(
+        &mut self,
+        demo_node: &crate::model::DemoNode,
+        procedure: &EndpointProcedureSpec,
+    ) {
+        let learned_node = self.ensure_node(demo_node);
+        push_procedure(
+            &mut learned_node.endpoint_procedures,
+            procedure.procedure_id.clone(),
+            Some(procedure.description.clone()),
+        );
+    }
+
+    fn remember_leaf_from_spec(
+        &mut self,
+        demo_node: &crate::model::DemoNode,
+        leaf_spec: &crate::model::LeafSpec,
+    ) {
+        let learned_node = self.ensure_node(demo_node);
+        let leaf = ensure_leaf(
+            &mut learned_node.leaves,
+            leaf_spec.name.clone(),
+            Some(leaf_spec.description.clone()),
+        );
+        for procedure_id in &leaf_spec.procedures {
+            push_procedure(
+                &mut leaf.procedures,
+                procedure_id.clone(),
+                Some(leaf_spec.description.clone()),
+            );
+        }
+    }
+
+    fn remember_endpoint_introspection(
+        &mut self,
+        demo_node: &crate::model::DemoNode,
+        introspection: &EndpointIntrospection,
+    ) {
+        let learned_node = self.ensure_node(demo_node);
+        learned_node.endpoint_introspected = true;
+        for summary in &introspection.leaves {
+            let description = demo_node
+                .leaves
+                .iter()
+                .find(|leaf| leaf.name == summary.leaf_name)
+                .map(|leaf| leaf.description.clone());
+            let leaf = ensure_leaf(
+                &mut learned_node.leaves,
+                summary.leaf_name.clone(),
+                description,
+            );
+            for procedure_id in &summary.procedures {
+                push_procedure(&mut leaf.procedures, procedure_id.clone(), None);
+            }
+        }
+    }
+
+    fn remember_leaf_introspection(
+        &mut self,
+        demo_node: &crate::model::DemoNode,
+        introspection: &LeafIntrospection,
+    ) {
+        let learned_node = self.ensure_node(demo_node);
+        let description = demo_node
+            .leaves
+            .iter()
+            .find(|leaf| leaf.name == introspection.leaf_name)
+            .map(|leaf| leaf.description.clone());
+        let leaf = ensure_leaf(
+            &mut learned_node.leaves,
+            introspection.leaf_name.clone(),
+            description,
+        );
+        for procedure_id in &introspection.procedures {
+            push_procedure(&mut leaf.procedures, procedure_id.clone(), None);
+        }
+    }
+
+    fn clear_deeper_than_one_hop(&mut self) {
+        self.nodes.retain(|path, _| path.len() <= 1);
+    }
+
+    pub fn node(&self, path: &[String]) -> Option<&LearnedNode> {
+        self.nodes.get(path)
+    }
+
+    pub fn known_paths(&self) -> Vec<Vec<String>> {
+        self.nodes.keys().cloned().collect()
+    }
+}
+
+fn ensure_leaf<'a>(
+    leaves: &'a mut Vec<LearnedLeaf>,
+    leaf_name: String,
+    description: Option<String>,
+) -> &'a mut LearnedLeaf {
+    if let Some(index) = leaves.iter().position(|leaf| leaf.leaf_name == leaf_name) {
+        if leaves[index].description.is_none() {
+            leaves[index].description = description;
+        }
+        return &mut leaves[index];
+    }
+
+    leaves.push(LearnedLeaf {
+        leaf_name,
+        description,
+        procedures: Vec::new(),
+    });
+    leaves.last_mut().expect("just pushed")
+}
+
+fn push_procedure(
+    procedures: &mut Vec<LearnedProcedure>,
+    procedure_id: String,
+    description: Option<String>,
+) {
+    if let Some(existing) = procedures
+        .iter_mut()
+        .find(|procedure| procedure.procedure_id == procedure_id)
+    {
+        if existing.description.is_none() {
+            existing.description = description;
+        }
+        return;
+    }
+    procedures.push(LearnedProcedure {
+        procedure_id,
+        description,
+    });
+}
+
 impl Simulation {
     /// Creates a fresh simulation from a scenario definition.
     pub fn new(scenario: ScenarioDefinition) -> Result<Self, SimError> {
@@ -172,6 +413,8 @@ impl Simulation {
             });
         }
 
+        let root_knowledge = RootKnowledge::new(&tree);
+
         Ok(Self {
             scenario,
             tree,
@@ -181,6 +424,8 @@ impl Simulation {
             trace: VecDeque::new(),
             recorded_events: Vec::new(),
             hooks: BTreeMap::new(),
+            inspector_mode: InspectorMode::GroundTruth,
+            root_knowledge,
             chat_sessions: BTreeMap::new(),
         })
     }
@@ -195,6 +440,25 @@ impl Simulation {
         self.tree.node(id)
     }
 
+    /// Clears deeper root memory and switches the inspector into realistic mode.
+    pub fn enable_realistic_mode_with_memory_reset(&mut self) {
+        self.root_knowledge.clear_deeper_than_one_hop();
+        self.inspector_mode = InspectorMode::Realistic;
+    }
+
+    /// Toggles the inspector between learned state and ground truth.
+    pub fn toggle_inspector_mode(&mut self) {
+        self.inspector_mode = match self.inspector_mode {
+            InspectorMode::GroundTruth => InspectorMode::Realistic,
+            InspectorMode::Realistic => InspectorMode::GroundTruth,
+        };
+    }
+
+    /// Returns whether the inspector is using learned state.
+    pub fn is_realistic_mode(&self) -> bool {
+        self.inspector_mode == InspectorMode::Realistic
+    }
+
     /// Builds and routes an endpoint introspection call from the root.
     pub fn call_endpoint_introspection(
         &mut self,
@@ -215,11 +479,18 @@ impl Simulation {
         leaf_name: &str,
     ) -> Result<ActionResult, SimError> {
         let node_path = self.tree.node(node_id).path.clone();
-        let node_display = self.tree.node(node_id).display_path();
         self.require_leaf(node_id, leaf_name)?;
+        let node = self.tree.node(node_id).clone();
+        if let Some(leaf_spec) = node.leaves.iter().find(|leaf| leaf.name == leaf_name) {
+            self.root_knowledge
+                .remember_leaf_from_spec(&node, leaf_spec);
+        }
         self.dispatch_root_call(node_path, Some(leaf_name.to_owned()), "", Vec::new())?;
         Ok(ActionResult {
-            label: format!("Inspect leaf {} on {}", leaf_name, node_display),
+            label: format!(
+                "Inspect {}",
+                format_leaf_ref(&self.node(node_id).path, leaf_name)
+            ),
             hook_id: self.hooks.last_key_value().map(|(hook_id, _)| *hook_id),
         })
     }
@@ -233,9 +504,18 @@ impl Simulation {
     ) -> Result<ActionResult, SimError> {
         let node_path = self.tree.node(node_id).path.clone();
         let node_display = self.tree.node(node_id).display_path();
-        let leaf = self.require_leaf(node_id, leaf_name)?;
+        let node = self.tree.node(node_id).clone();
+        let procedures = self.require_leaf(node_id, leaf_name)?.procedures.clone();
+        if let Some(leaf_spec) = node
+            .leaves
+            .iter()
+            .find(|known_leaf| known_leaf.name == leaf_name)
+        {
+            self.root_knowledge
+                .remember_leaf_from_spec(&node, leaf_spec);
+        }
         let procedure_id =
-            leaf.procedures
+            procedures
                 .first()
                 .cloned()
                 .ok_or_else(|| SimError::UnknownProcedure {
@@ -249,7 +529,10 @@ impl Simulation {
             text.as_bytes().to_vec(),
         )?;
         Ok(ActionResult {
-            label: format!("Echo via {leaf_name} on {}", node_display),
+            label: format!(
+                "Echo via {}",
+                format_leaf_ref(&self.node(node_id).path, leaf_name)
+            ),
             hook_id: self.hooks.last_key_value().map(|(hook_id, _)| *hook_id),
         })
     }
@@ -264,6 +547,15 @@ impl Simulation {
         let node_path = self.tree.node(node_id).path.clone();
         let node_display = self.tree.node(node_id).display_path();
         self.require_endpoint_procedure(node_id, procedure_id)?;
+        let node = self.tree.node(node_id).clone();
+        if let Some(procedure) = node
+            .endpoint_procedures
+            .iter()
+            .find(|known_procedure| known_procedure.procedure_id == procedure_id)
+        {
+            self.root_knowledge
+                .remember_endpoint_procedure(&node, procedure);
+        }
         self.dispatch_root_call(node_path, None, procedure_id, data)?;
         Ok(ActionResult {
             label: format!("Call {procedure_id} on {}", node_display),
@@ -293,7 +585,10 @@ impl Simulation {
                 },
                 node_display,
                 dst_leaf
-                    .map(|leaf_name| format!(" leaf {leaf_name}"))
+                    .map(|leaf_name| format!(
+                        " {}",
+                        format_leaf_ref(&self.node(node_id).path, leaf_name)
+                    ))
                     .unwrap_or_default()
             ),
             hook_id: self.hooks.last_key_value().map(|(hook_id, _)| *hook_id),
@@ -324,7 +619,10 @@ impl Simulation {
             .map_err(|error| SimError::Protocol(error.to_string()))?;
         self.record_trace(
             self.root_id,
-            format!("root queued hook data for hook #{hook_id}: {text}"),
+            format!(
+                "root queued hook data for {}: {text}",
+                format_hook_ref(self.node(self.root_id).path.as_slice(), hook_id)
+            ),
         );
         self.process_local_frame(self.root_id, frame)?;
         Ok(ActionResult {
@@ -362,13 +660,17 @@ impl Simulation {
         self.record_trace(
             from_node_id,
             format!(
-                "injected invalid peer data toward {} for hook #{hook_id}",
+                "injected invalid peer data toward {} for {}",
-                format_path(&to_path)
+                format_path(&to_path),
+                format_hook_ref(self.node(to_node_id).path.as_slice(), hook_id)
             ),
         );
         self.process_local_frame(from_node_id, frame)?;
         Ok(ActionResult {
-            label: format!("Inject invalid peer data for hook #{hook_id}"),
+            label: format!(
+                "Inject invalid peer data for {}",
+                format_hook_ref(self.node(to_node_id).path.as_slice(), hook_id)
+            ),
             hook_id: Some(hook_id),
         })
     }
@@ -432,6 +734,7 @@ impl Simulation {
                 host_path: Vec::new(),
                 peer_path: dst_path.clone(),
                 procedure_id: procedure_id.to_owned(),
+                target_leaf: dst_leaf.clone(),
                 closed: false,
                 last_message: format!("created for {}", format_path(&dst_path)),
             },
@@ -448,7 +751,7 @@ impl Simulation {
                 format_path(&dst_path),
                 dst_leaf
                     .as_ref()
-                    .map(|leaf| format!(" leaf {leaf}"))
+                    .map(|leaf| format!(" {}", format_leaf_ref(&dst_path, leaf)))
                     .unwrap_or_default()
             ),
         );
@@ -543,8 +846,11 @@ impl Simulation {
                 self.record_trace(
                     node_id,
                     format!(
-                        "local Data on hook #{}: {text}",
+                        "local Data on {}: {text}",
+                        format_hook_ref(
+                            self.node(node_id).path.as_slice(),
                             header.hook_id.unwrap_or(0)
+                        )
                     ),
                 );
                 if let Some(hook_id) = header.hook_id {
@@ -558,6 +864,10 @@ impl Simulation {
                             snapshot.closed = true;
                         }
                     }
+
+                    if node_id == self.root_id {
+                        self.learn_from_root_data(hook_id, &message);
+                    }
                 }
 
                 if let Some(session) = self
@@ -606,8 +916,11 @@ impl Simulation {
                 self.record_trace(
                     node_id,
                     format!(
-                        "local Fault on hook #{}: 0x{:02X}",
+                        "local Fault on {}: 0x{:02X}",
-                        header.hook_id.unwrap_or(0),
+                        format_hook_ref(
+                            self.node(node_id).path.as_slice(),
+                            header.hook_id.unwrap_or(0)
+                        ),
                         message.fault.0
                     ),
                 );
@@ -633,7 +946,7 @@ impl Simulation {
                         header
                             .dst_leaf
                             .as_ref()
-                            .map(|leaf| format!("leaf {leaf}"))
+                            .map(|leaf| format_leaf_ref(&header.dst_path, leaf))
                             .unwrap_or_else(|| "endpoint".to_owned())
                     ),
                 );
@@ -835,8 +1148,55 @@ impl Simulation {
                 format!("{}: {}", node.display_path(), node.title)
             }
             Selection::Leaf { node_id, leaf_name } => {
-                format!("{} leaf {}", self.node(*node_id).display_path(), leaf_name)
+                format_leaf_ref(&self.node(*node_id).path, leaf_name)
             }
         }
     }
+
+    fn learn_from_root_data(&mut self, hook_id: u64, message: &DataMessage) {
+        let Some(snapshot) = self.hooks.get(&hook_id).cloned() else {
+            return;
+        };
+        let Some(node_id) = self.tree.find_by_path(&snapshot.peer_path) else {
+            return;
+        };
+        let demo_node = self.node(node_id).clone();
+
+        if snapshot.procedure_id.is_empty() {
+            if snapshot.target_leaf.is_some() {
+                if let Ok(introspection) = deserialize_archived_bytes::<
+                    unshell::protocol::introspection::ArchivedLeafIntrospection,
+                    LeafIntrospection,
+                >(&message.data)
+                {
+                    self.root_knowledge
+                        .remember_leaf_introspection(&demo_node, &introspection);
+                }
+            } else if let Ok(introspection) = deserialize_archived_bytes::<
+                unshell::protocol::introspection::ArchivedEndpointIntrospection,
+                EndpointIntrospection,
+            >(&message.data)
+            {
+                self.root_knowledge
+                    .remember_endpoint_introspection(&demo_node, &introspection);
+            }
+            return;
+        }
+
+        if let Some(procedure) = demo_node
+            .endpoint_procedures
+            .iter()
+            .find(|procedure| procedure.procedure_id == snapshot.procedure_id)
+        {
+            self.root_knowledge
+                .remember_endpoint_procedure(&demo_node, procedure);
+        }
+
+        if let Some(leaf_name) = &snapshot.target_leaf
+            && let Some(leaf_spec) = demo_node.leaves.iter().find(|leaf| &leaf.name == leaf_name)
+        {
+            self.root_knowledge
+                .remember_leaf_from_spec(&demo_node, leaf_spec);
+        }
+    }
 }

treetest/tests/knowledge.rs

@@ -0,0 +1,41 @@
+use treetest::{model::NodeId, scenarios::built_in_scenarios, sim::Simulation};
+
+#[test]
+fn realistic_mode_memory_reset_forgets_deeper_nodes() {
+    let scenarios = built_in_scenarios();
+    let mut simulation = Simulation::new(scenarios[2].clone()).expect("scenario should build");
+
+    simulation
+        .call_echo_leaf(NodeId(2), "echo", "learn this nested leaf")
+        .expect("echo call should start");
+    simulation.drain().expect("network should drain");
+
+    assert!(
+        simulation
+            .root_knowledge
+            .node(&simulation.node(NodeId(2)).path)
+            .is_some()
+    );
+
+    simulation.enable_realistic_mode_with_memory_reset();
+
+    assert!(simulation.is_realistic_mode());
+    assert!(
+        simulation
+            .root_knowledge
+            .node(&simulation.node(NodeId(2)).path)
+            .is_none()
+    );
+    assert!(
+        simulation
+            .root_knowledge
+            .node(&simulation.node(NodeId(1)).path)
+            .is_some()
+    );
+    assert!(
+        simulation
+            .root_knowledge
+            .node(&simulation.node(NodeId(0)).path)
+            .is_some()
+    );
+}