hmm speculative

packages/core/src/context/ir/projector.ts

@@ -37,8 +37,17 @@ export class IrProjector {
     }
 
     const maxTokens = sidecar.budget.maxTokens;
-    const currentTokens =
-      env.tokenCalculator.calculateConcreteListTokens(ship);
+    const currentTokens = env.tokenCalculator.calculateConcreteListTokens(ship);
+
+    // V0: Always protect the first node (System Prompt) and the last turn
+    if (ship.length > 0) {
+      protectedIds.add(ship[0].id);
+      if (ship[0].logicalParentId) protectedIds.add(ship[0].logicalParentId);
+
+      const lastNode = ship[ship.length - 1];
+      protectedIds.add(lastNode.id);
+      if (lastNode.logicalParentId) protectedIds.add(lastNode.logicalParentId);
+    }
 
     if (currentTokens <= maxTokens) {
       tracer.logEvent(
@@ -101,11 +110,11 @@ export class IrProjector {
     const skipList = new Set<string>();
     for (const node of processedShip) {
       if (node.abstractsIds) {
-         for (const id of node.abstractsIds) skipList.add(id);
+        for (const id of node.abstractsIds) skipList.add(id);
       }
     }
 
-    const visibleShip = processedShip.filter(n => !skipList.has(n.id));
+    const visibleShip = processedShip.filter((n) => !skipList.has(n.id));
 
     const contents = IrMapper.fromIr(visibleShip);
     tracer.logEvent('IrProjector', 'Projected Sanitized Context to LLM', {

packages/core/src/context/ir/toIr.ts

@@ -37,8 +37,8 @@ function isCompleteEpisode(ep: Partial<Episode>): ep is Episode {
   return (
     typeof ep.id === 'string' &&
     typeof ep.timestamp === 'number' &&
-    Array.isArray(ep.concreteNodeIds) &&
-    ep.concreteNodeIds.length > 0
+    Array.isArray(ep.concreteNodes) &&
+    ep.concreteNodes.length > 0
   );
 }
 
@@ -118,7 +118,7 @@ function parseToolResponses(
     currentEpisode = {
       id: getStableId(msg),
       timestamp: Date.now(),
-      concreteNodeIds: [getStableId(msg.parts![0] || msg)],
+      concreteNodes: [],
     };
   }
 
@@ -152,7 +152,10 @@ function parseToolResponses(
           transformations: [],
         },
       };
-      currentEpisode.concreteNodeIds = [...(currentEpisode.concreteNodeIds || []), step.id];
+      currentEpisode.concreteNodes = [
+        ...(currentEpisode.concreteNodes || []),
+        step,
+      ];
       if (callId) pendingCallParts.delete(callId);
     }
   }
@@ -193,7 +196,8 @@ function parseUserParts(
   return {
     id: getStableId(msg),
     timestamp: Date.now(),
-    concreteNodeIds: [trigger.id],  };
+    concreteNodes: [trigger],
+  };
 }
 
 function parseModelParts(
@@ -206,7 +210,7 @@ function parseModelParts(
     currentEpisode = {
       id: getStableId(msg),
       timestamp: Date.now(),
-      concreteNodeIds: [getStableId(msg.parts![0] || msg)],
+      concreteNodes: [],
     };
   }
 
@@ -221,25 +225,29 @@ function parseModelParts(
         text: part.text,
         metadata: createMetadata([part]),
       };
-      currentEpisode.concreteNodeIds = [...(currentEpisode.concreteNodeIds || []), thought.id];
+      currentEpisode.concreteNodes = [
+        ...(currentEpisode.concreteNodes || []),
+        thought,
+      ];
     }
   }
   return currentEpisode as Partial<Episode>;
 }
 
 function finalizeYield(currentEpisode: Partial<Episode>) {
-  if (currentEpisode.concreteNodeIds && currentEpisode.concreteNodeIds.length > 0) {
-      const yieldNode: AgentYield = {
-        id: randomUUID(),
-        type: 'AGENT_YIELD',
-        text: 'Yield', // Synthesized yield since we don't have the original concrete node
-        metadata: {
-           originalTokens: 1,
-           currentTokens: 1,
-           transformations: []
-        },
-      };
-      const existingNodes = currentEpisode.concreteNodeIds as string[];
-      currentEpisode.concreteNodeIds = [...existingNodes.slice(0, -1), yieldNode.id];
+  if (currentEpisode.concreteNodes && currentEpisode.concreteNodes.length > 0) {
+    const yieldNode: AgentYield = {
+      id: randomUUID(),
+      type: 'AGENT_YIELD',
+      text: 'Yield', // Synthesized yield since we don't have the original concrete node
+      metadata: {
+        originalTokens: 1,
+        currentTokens: 1,
+        transformations: [],
+      },
+    };
+    const existingNodes =
+      currentEpisode.concreteNodes as import('./types.js').ConcreteNode[];
+    currentEpisode.concreteNodes = [...existingNodes, yieldNode];
   }
 }

packages/core/src/context/ir/types.ts

@@ -39,7 +39,7 @@ export type IrNodeType =
   | 'AGENT_THOUGHT'
   | 'TOOL_EXECUTION'
   | 'AGENT_YIELD'
-  
+
   // Synthetic Concrete Nodes
   | 'SNAPSHOT'
   | 'ROLLING_SUMMARY'
@@ -56,17 +56,17 @@ export interface IrNode {
   readonly metadata: IrMetadata;
 }
 
-/** 
+/**
  * Concrete Nodes: The atomic, renderable pieces of data.
  * These are the actual "planks" of the Ship of Theseus.
  */
 export interface BaseConcreteNode extends IrNode {
   /** The ID of the Logical Node (e.g., Episode) that structurally owns this node */
   readonly logicalParentId?: string;
-  
+
   /** If this node replaced a single node 1:1 (e.g., masking), this points to the original */
   readonly replacesId?: string;
-  
+
   /** If this node is a synthetic summary of N nodes, this points to the original IDs */
   readonly abstractsIds?: readonly string[];
 }
@@ -171,14 +171,14 @@ export interface RollingSummary extends BaseConcreteNode {
 
 export type SyntheticLeaf = Snapshot | RollingSummary;
 
-export type ConcreteNode = 
-  | UserPrompt 
-  | SystemEvent 
-  | AgentThought 
-  | ToolExecution 
-  | MaskedTool 
-  | AgentYield 
-  | Snapshot 
+export type ConcreteNode =
+  | UserPrompt
+  | SystemEvent
+  | AgentThought
+  | ToolExecution
+  | MaskedTool
+  | AgentYield
+  | Snapshot
   | RollingSummary;
 
 /**
@@ -189,7 +189,7 @@ export interface Episode extends IrNode {
   readonly type: 'EPISODE';
   readonly timestamp: number;
   /** References to the Concrete Node IDs that conceptually belong to this Episode. */
-  concreteNodeIds: readonly string[];
+  concreteNodes: readonly ConcreteNode[];
 }
 
 export interface Task extends IrNode {