feat(core): Improvements to the AgentHistoryProvider.

packages/cli/src/config/config.ts

@@ -975,14 +975,10 @@ export async function loadCliConfig(
     disabledSkills: settings.skills?.disabled,
     experimentalJitContext: settings.experimental?.jitContext,
     experimentalMemoryManager: settings.experimental?.memoryManager,
-    experimentalAgentHistoryTruncation:
-      settings.experimental?.agentHistoryTruncation,
-    experimentalAgentHistoryTruncationThreshold:
-      settings.experimental?.agentHistoryTruncationThreshold,
-    experimentalAgentHistoryRetainedMessages:
-      settings.experimental?.agentHistoryRetainedMessages,
-    experimentalAgentHistorySummarization:
-      settings.experimental?.agentHistorySummarization,
+    contextManagement: {
+      enabled: settings.experimental?.contextManagement,
+      ...settings?.contextManagement,
+    },
     modelSteering: settings.experimental?.modelSteering,
     topicUpdateNarration: settings.experimental?.topicUpdateNarration,
     toolOutputMasking: settings.experimental?.toolOutputMasking,

packages/cli/src/config/settingsSchema.ts

@@ -2141,44 +2141,13 @@ const SETTINGS_SCHEMA = {
           'Replace the built-in save_memory tool with a memory manager subagent that supports adding, removing, de-duplicating, and organizing memories.',
         showInDialog: true,
       },
-      agentHistoryTruncation: {
+      contextManagement: {
         type: 'boolean',
-        label: 'Agent History Truncation',
+        label: 'Enable Context Management',
         category: 'Experimental',
         requiresRestart: true,
         default: false,
-        description:
-          'Enable truncation window logic for the Agent History Provider.',
-        showInDialog: true,
-      },
-      agentHistoryTruncationThreshold: {
-        type: 'number',
-        label: 'Agent History Truncation Threshold',
-        category: 'Experimental',
-        requiresRestart: true,
-        default: 30,
-        description:
-          'The maximum number of messages before history is truncated.',
-        showInDialog: true,
-      },
-      agentHistoryRetainedMessages: {
-        type: 'number',
-        label: 'Agent History Retained Messages',
-        category: 'Experimental',
-        requiresRestart: true,
-        default: 15,
-        description:
-          'The number of recent messages to retain after truncation.',
-        showInDialog: true,
-      },
-      agentHistorySummarization: {
-        type: 'boolean',
-        label: 'Agent History Summarization',
-        category: 'Experimental',
-        requiresRestart: true,
-        default: false,
-        description:
-          'Enable summarization of truncated content via a small model for the Agent History Provider.',
+        description: 'Enable logic for context management.',
         showInDialog: true,
       },
       topicUpdateNarration: {
@@ -2457,6 +2426,129 @@ const SETTINGS_SCHEMA = {
     },
   },
 
+  contextManagement: {
+    type: 'object',
+    label: 'Context Management',
+    category: 'Experimental',
+    requiresRestart: true,
+    default: {},
+    description:
+      'Settings for agent history and tool distillation context management.',
+    showInDialog: false,
+    properties: {
+      historyWindow: {
+        type: 'object',
+        label: 'History Window Settings',
+        category: 'Context Management',
+        requiresRestart: true,
+        default: {},
+        showInDialog: false,
+        properties: {
+          truncationThreshold: {
+            type: 'number',
+            label: 'Truncation Threshold',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 25,
+            description:
+              'The maximum number of messages before history is truncated.',
+            showInDialog: true,
+          },
+          retainedMessages: {
+            type: 'number',
+            label: 'Retained Messages',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 20,
+            description:
+              'The number of recent messages to retain after truncation.',
+            showInDialog: true,
+          },
+          targetRetainedTokens: {
+            type: 'number',
+            label: 'Target Retained Tokens',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 40000,
+            description:
+              'The target number of tokens to retain in the session history.',
+            showInDialog: true,
+          },
+        },
+      },
+      messageLimits: {
+        type: 'object',
+        label: 'Message Limits',
+        category: 'Context Management',
+        requiresRestart: true,
+        default: {},
+        showInDialog: false,
+        properties: {
+          normalTokenLimit: {
+            type: 'number',
+            label: 'Normal Token Limit',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 2500,
+            description:
+              'The target number of tokens to budget for a normal conversation turn.',
+            showInDialog: true,
+          },
+          maximumTokenLimit: {
+            type: 'number',
+            label: 'Maximum Token Limit',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 12000,
+            description:
+              'The maximum number of tokens a single conversation turn can consume before truncation.',
+            showInDialog: true,
+          },
+          normalizationHeadRatio: {
+            type: 'number',
+            label: 'Normalization Head Ratio',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 0.25,
+            description:
+              'The ratio of tokens to retain from the beginning of a truncated message (0.0 to 1.0).',
+            showInDialog: true,
+          },
+        },
+      },
+      toolDistillation: {
+        type: 'object',
+        label: 'Tool Distillation',
+        category: 'Context Management',
+        requiresRestart: true,
+        default: {},
+        showInDialog: false,
+        properties: {
+          truncationThreshold: {
+            type: 'number',
+            label: 'Tool Truncation Threshold',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 40000,
+            description:
+              'Maximum characters to show when truncating large tool outputs. Set to 0 or negative to disable truncation.',
+            showInDialog: true,
+          },
+          summarizationThreshold: {
+            type: 'number',
+            label: 'Tool Summarization Threshold',
+            category: 'Context Management',
+            requiresRestart: true,
+            default: 80000,
+            description:
+              'Threshold above which truncated tool outputs will be summarized by an LLM.',
+            showInDialog: true,
+          },
+        },
+      },
+    },
+  },
+
   admin: {
     type: 'object',
     label: 'Admin',