diff --git a/docs/reference/configuration.md b/docs/reference/configuration.md
index a5a6aa1eb2..5e30b7a91d 100644
--- a/docs/reference/configuration.md
+++ b/docs/reference/configuration.md
@@ -1729,6 +1729,12 @@ their corresponding top-level category object in your `settings.json` file.
   - **Default:** `false`
   - **Requires restart:** Yes
 
+- **`experimental.stressTestProfile`** (boolean):
+  - **Description:** Significantly lowers token limits to force early garbage
+    collection and distillation for testing purposes.
+  - **Default:** `false`
+  - **Requires restart:** Yes
+
 - **`experimental.autoMemory`** (boolean):
   - **Description:** Automatically extract reusable skills from past sessions in
     the background. Review results with /memory inbox.
diff --git a/packages/cli/src/config/config.test.ts b/packages/cli/src/config/config.test.ts
index 04df366a98..155bef7bfa 100644
--- a/packages/cli/src/config/config.test.ts
+++ b/packages/cli/src/config/config.test.ts
@@ -21,8 +21,6 @@ import {
   type MCPServerConfig,
   type GeminiCLIExtension,
   Storage,
-  generalistProfile,
-  type ContextManagementConfig,
 } from '@google/gemini-cli-core';
 import { loadCliConfig, parseArguments, type CliArgs } from './config.js';
 import {
@@ -2210,51 +2208,6 @@ describe('loadCliConfig context management', () => {
       },
     });
     const config = await loadCliConfig(settings, 'test-session', argv);
-    expect(config.getContextManagementConfig()).toStrictEqual(
-      generalistProfile,
-    );
-    expect(config.isContextManagementEnabled()).toBe(true);
-  });
-
-  it('should be true when contextManagement is set to true in settings', async () => {
-    process.argv = ['node', 'script.js'];
-    const argv = await parseArguments(createTestMergedSettings());
-    const contextManagementConfig: Partial<ContextManagementConfig> = {
-      historyWindow: {
-        maxTokens: 100_000,
-        retainedTokens: 50_000,
-      },
-      messageLimits: {
-        normalMaxTokens: 1000,
-        retainedMaxTokens: 10_000,
-        normalizationHeadRatio: 0.25,
-      },
-      tools: {
-        distillation: {
-          maxOutputTokens: 10_000,
-          summarizationThresholdTokens: 15_000,
-        },
-        outputMasking: {
-          protectionThresholdTokens: 30_000,
-          minPrunableThresholdTokens: 10_000,
-          protectLatestTurn: false,
-        },
-      },
-    };
-    const settings = createTestMergedSettings({
-      experimental: {
-        contextManagement: true,
-      },
-      // The type of numbers is being inferred strangely, and so we have to cast
-      // to `any` here.
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      contextManagement: contextManagementConfig as any,
-    });
-    const config = await loadCliConfig(settings, 'test-session', argv);
-    expect(config.getContextManagementConfig()).toStrictEqual({
-      enabled: true,
-      ...contextManagementConfig,
-    });
     expect(config.isContextManagementEnabled()).toBe(true);
   });
 });
diff --git a/packages/cli/src/config/config.ts b/packages/cli/src/config/config.ts
index d3b807f991..40cdaaa61c 100755
--- a/packages/cli/src/config/config.ts
+++ b/packages/cli/src/config/config.ts
@@ -46,7 +46,6 @@ import {
   type HookEventName,
   type OutputFormat,
   detectIdeFromEnv,
-  generalistProfile,
 } from '@google/gemini-cli-core';
 import {
   type Settings,
@@ -884,14 +883,19 @@ export async function loadCliConfig(
     }
   }
 
-  const useGeneralistProfile =
-    settings.experimental?.generalistProfile ?? false;
-  const useContextManagement =
-    settings.experimental?.contextManagement ?? false;
+  // TODO(joshualitt): Clean this up alongside removal of the legacy config.
+  let profileSelector: string | undefined = undefined;
+  if (settings.experimental?.stressTestProfile) {
+    profileSelector = 'stressTestProfile';
+  } else if (
+    settings.experimental?.generalistProfile ||
+    settings.experimental?.contextManagement
+  ) {
+    profileSelector = 'generalistProfile';
+  }
+
   const contextManagement = {
-    ...(useGeneralistProfile ? generalistProfile : {}),
-    ...(useContextManagement ? settings?.contextManagement : {}),
-    enabled: useContextManagement || useGeneralistProfile,
+    enabled: !!profileSelector,
   };
 
   return new Config({
@@ -915,6 +919,7 @@ export async function loadCliConfig(
     worktreeSettings,
 
     coreTools: settings.tools?.core || undefined,
+    experimentalContextManagementConfig: profileSelector,
     allowedTools: allowedTools.length > 0 ? allowedTools : undefined,
     policyEngineConfig,
     policyUpdateConfirmationRequest,
diff --git a/packages/cli/src/config/settingsSchema.ts b/packages/cli/src/config/settingsSchema.ts
index 93ac53ada3..c865f7576d 100644
--- a/packages/cli/src/config/settingsSchema.ts
+++ b/packages/cli/src/config/settingsSchema.ts
@@ -2213,6 +2213,17 @@ 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,
       },
+      stressTestProfile: {
+        type: 'boolean',
+        label:
+          'Use the stress test profile to aggressively trigger context management.',
+        category: 'Experimental',
+        requiresRestart: true,
+        default: false,
+        description:
+          'Significantly lowers token limits to force early garbage collection and distillation for testing purposes.',
+        showInDialog: false,
+      },
       autoMemory: {
         type: 'boolean',
         label: 'Auto Memory',
diff --git a/packages/core/src/context/config/configLoader.test.ts b/packages/core/src/context/config/configLoader.test.ts
index b4c9885c9a..809c1ce3cc 100644
--- a/packages/core/src/context/config/configLoader.test.ts
+++ b/packages/core/src/context/config/configLoader.test.ts
@@ -6,19 +6,17 @@
 
 import { describe, it, expect, beforeEach, afterEach } from 'vitest';
 import { loadContextManagementConfig } from './configLoader.js';
-import { defaultContextProfile } from './profiles.js';
+import { generalistProfile } from './profiles.js';
 import { ContextProcessorRegistry } from './registry.js';
 import * as fs from 'node:fs/promises';
 import * as path from 'node:path';
 import * as os from 'node:os';
-import type { Config } from '../../config/config.js';
 import type { JSONSchemaType } from 'ajv';
 
 describe('SidecarLoader (Real FS)', () => {
   let tmpDir: string;
   let registry: ContextProcessorRegistry;
   let sidecarPath: string;
-  let mockConfig: Config;
 
   beforeEach(async () => {
     tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'gemini-sidecar-test-'));
@@ -32,10 +30,6 @@ describe('SidecarLoader (Real FS)', () => {
         required: ['maxTokens'],
       } as unknown as JSONSchemaType<{ maxTokens: number }>,
     });
-
-    mockConfig = {
-      getExperimentalContextManagementConfig: () => sidecarPath,
-    } as unknown as Config;
   });
 
   afterEach(async () => {
@@ -43,14 +37,14 @@ describe('SidecarLoader (Real FS)', () => {
   });
 
   it('returns default profile if file does not exist', async () => {
-    const result = await loadContextManagementConfig(mockConfig, registry);
-    expect(result).toBe(defaultContextProfile);
+    const result = await loadContextManagementConfig(sidecarPath, registry);
+    expect(result).toBe(generalistProfile);
   });
 
   it('returns default profile if file exists but is 0 bytes', async () => {
     await fs.writeFile(sidecarPath, '');
-    const result = await loadContextManagementConfig(mockConfig, registry);
-    expect(result).toBe(defaultContextProfile);
+    const result = await loadContextManagementConfig(sidecarPath, registry);
+    expect(result).toBe(generalistProfile);
   });
 
   it('returns parsed config if file is valid', async () => {
@@ -64,7 +58,7 @@ describe('SidecarLoader (Real FS)', () => {
       },
     };
     await fs.writeFile(sidecarPath, JSON.stringify(validConfig));
-    const result = await loadContextManagementConfig(mockConfig, registry);
+    const result = await loadContextManagementConfig(sidecarPath, registry);
     expect(result.config.budget?.maxTokens).toBe(2000);
     expect(result.config.processorOptions?.['myTruncation']).toBeDefined();
   });
@@ -81,14 +75,14 @@ describe('SidecarLoader (Real FS)', () => {
     };
     await fs.writeFile(sidecarPath, JSON.stringify(invalidConfig));
     await expect(
-      loadContextManagementConfig(mockConfig, registry),
+      loadContextManagementConfig(sidecarPath, registry),
     ).rejects.toThrow('Validation error');
   });
 
   it('throws validation error if file is empty whitespace', async () => {
     await fs.writeFile(sidecarPath, '   \n  ');
     await expect(
-      loadContextManagementConfig(mockConfig, registry),
+      loadContextManagementConfig(sidecarPath, registry),
     ).rejects.toThrow('Unexpected end of JSON input');
   });
 });
diff --git a/packages/core/src/context/config/configLoader.ts b/packages/core/src/context/config/configLoader.ts
index b010f47e61..611141cddc 100644
--- a/packages/core/src/context/config/configLoader.ts
+++ b/packages/core/src/context/config/configLoader.ts
@@ -4,11 +4,14 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import type { Config } from '../../config/config.js';
 import * as fsSync from 'node:fs';
 import * as fs from 'node:fs/promises';
 import type { ContextManagementConfig } from './types.js';
-import { defaultContextProfile, type ContextProfile } from './profiles.js';
+import {
+  generalistProfile,
+  stressTestProfile,
+  type ContextProfile,
+} from './profiles.js';
 import { SchemaValidator } from '../../utils/schemaValidator.js';
 import { getContextManagementConfigSchema } from './schema.js';
 import type { ContextProcessorRegistry } from './registry.js';
@@ -54,9 +57,9 @@ async function loadConfigFromFile(
   // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
   const validConfig = parsed as ContextManagementConfig;
   return {
-    ...defaultContextProfile,
+    ...generalistProfile,
     config: {
-      ...defaultContextProfile.config,
+      ...generalistProfile.config,
       ...(validConfig.budget ? { budget: validConfig.budget } : {}),
       ...(validConfig.processorOptions
         ? { processorOptions: validConfig.processorOptions }
@@ -70,21 +73,27 @@ async function loadConfigFromFile(
  * If a config file is present but invalid, this will THROW to prevent silent misconfiguration.
  */
 export async function loadContextManagementConfig(
-  config: Config,
+  sidecarPath: string | undefined,
   registry: ContextProcessorRegistry,
 ): Promise<ContextProfile> {
-  const sidecarPath = config.getExperimentalContextManagementConfig();
+  if (sidecarPath === 'stressTestProfile') {
+    return stressTestProfile;
+  }
+
+  if (sidecarPath === 'generalistProfile') {
+    return generalistProfile;
+  }
 
   if (sidecarPath && fsSync.existsSync(sidecarPath)) {
     const size = fsSync.statSync(sidecarPath).size;
     // If the file exists but is completely empty (0 bytes), it's safe to fallback.
     if (size === 0) {
-      return defaultContextProfile;
+      return generalistProfile;
     }
 
     // If the file has content, enforce strict validation and throw on failure.
     return loadConfigFromFile(sidecarPath, registry);
   }
 
-  return defaultContextProfile;
+  return generalistProfile;
 }
diff --git a/packages/core/src/context/config/profiles.ts b/packages/core/src/context/config/profiles.ts
index d55c49fc48..662b88c2da 100644
--- a/packages/core/src/context/config/profiles.ts
+++ b/packages/core/src/context/config/profiles.ts
@@ -62,7 +62,7 @@ export interface ContextProfile {
  * The standard default context management profile.
  * Optimized for safety, precision, and reliable summarization.
  */
-export const defaultContextProfile: ContextProfile = {
+export const generalistProfile: ContextProfile = {
   config: {
     budget: {
       retainedTokens: 65000,
@@ -143,3 +143,41 @@ export const defaultContextProfile: ContextProfile = {
     },
   ],
 };
+
+/**
+ * A highly aggressive profile designed exclusively for testing Context Management.
+ * Lowers token limits dramatically to force garbage collection and distillation loops
+ * within a few conversational turns.
+ */
+export const stressTestProfile: ContextProfile = {
+  config: {
+    budget: {
+      retainedTokens: 4000,
+      maxTokens: 10000,
+    },
+    processorOptions: {
+      ToolMasking: {
+        type: 'ToolMaskingProcessor',
+        options: {
+          stringLengthThresholdTokens: 500,
+        },
+      },
+      NodeTruncation: {
+        type: 'NodeTruncationProcessor',
+        options: {
+          maxTokensPerNode: 1000,
+        },
+      },
+      NodeDistillation: {
+        type: 'NodeDistillationProcessor',
+        options: {
+          nodeThresholdTokens: 1500,
+        },
+      },
+    },
+  },
+  // Re-use the generalist pipeline architecture exactly, but the `config` above
+  // will be passed into `resolveProcessorOptions` to aggressively override the thresholds.
+  buildPipelines: generalistProfile.buildPipelines,
+  buildAsyncPipelines: generalistProfile.buildAsyncPipelines,
+};
diff --git a/packages/core/src/context/contextManager.ts b/packages/core/src/context/contextManager.ts
index b4e1e11858..41bd0e2308 100644
--- a/packages/core/src/context/contextManager.ts
+++ b/packages/core/src/context/contextManager.ts
@@ -47,9 +47,8 @@ export class ContextManager {
     this.historyObserver.start();
 
     this.eventBus.onPristineHistoryUpdated((event) => {
-      const existingIds = new Set(this.buffer.nodes.map((n) => n.id));
       const newIds = new Set(event.nodes.map((n) => n.id));
-      const addedNodes = event.nodes.filter((n) => !existingIds.has(n.id));
+      const addedNodes = event.nodes.filter((n) => event.newNodes.has(n.id));
 
       // Prune any pristine nodes that were dropped from the upstream history
       this.buffer = this.buffer.prunePristineNodes(newIds);
@@ -60,6 +59,13 @@ export class ContextManager {
 
       this.evaluateTriggers(event.newNodes);
     });
+    this.eventBus.onProcessorResult((event) => {
+      this.buffer = this.buffer.applyProcessorResult(
+        event.processorId,
+        event.targets,
+        event.returnedNodes,
+      );
+    });
   }
 
   /**
diff --git a/packages/core/src/context/eventBus.ts b/packages/core/src/context/eventBus.ts
index f63cf4294f..82e4d45e67 100644
--- a/packages/core/src/context/eventBus.ts
+++ b/packages/core/src/context/eventBus.ts
@@ -7,6 +7,12 @@
 import { EventEmitter } from 'node:events';
 import type { ConcreteNode } from './graph/types.js';
 
+export interface ProcessorResultEvent {
+  processorId: string;
+  targets: readonly ConcreteNode[];
+  returnedNodes: readonly ConcreteNode[];
+}
+
 export interface PristineHistoryUpdatedEvent {
   nodes: readonly ConcreteNode[];
   newNodes: Set<string>;
@@ -49,4 +55,12 @@ export class ContextEventBus extends EventEmitter {
   onConsolidationNeeded(listener: (event: ContextConsolidationEvent) => void) {
     this.on('BUDGET_RETAINED_CROSSED', listener);
   }
+
+  emitProcessorResult(event: ProcessorResultEvent) {
+    this.emit('PROCESSOR_RESULT', event);
+  }
+
+  onProcessorResult(listener: (event: ProcessorResultEvent) => void) {
+    this.on('PROCESSOR_RESULT', listener);
+  }
 }
diff --git a/packages/core/src/context/graph/mapper.ts b/packages/core/src/context/graph/mapper.ts
index 92b9d836db..4e7eef202b 100644
--- a/packages/core/src/context/graph/mapper.ts
+++ b/packages/core/src/context/graph/mapper.ts
@@ -3,9 +3,10 @@
  * Copyright 2026 Google LLC
  * SPDX-License-Identifier: Apache-2.0
  */
+import type { ConcreteNode } from './types.js';
+import { ContextGraphBuilder } from './toGraph.js';
 import type { Content } from '@google/genai';
-import type { Episode, ConcreteNode } from './types.js';
-import { toGraph } from './toGraph.js';
+import type { HistoryEvent } from '../../core/agentChatHistory.js';
 import { fromGraph } from './fromGraph.js';
 import type { ContextTokenCalculator } from '../utils/contextTokenCalculator.js';
 import type { NodeBehaviorRegistry } from './behaviorRegistry.js';
@@ -15,11 +16,30 @@ export class ContextGraphMapper {
 
   constructor(private readonly registry: NodeBehaviorRegistry) {}
 
-  toGraph(
-    history: readonly Content[],
+  private builder?: ContextGraphBuilder;
+
+  applyEvent(
+    event: HistoryEvent,
     tokenCalculator: ContextTokenCalculator,
-  ): Episode[] {
-    return toGraph(history, tokenCalculator, this.nodeIdentityMap);
+  ): ConcreteNode[] {
+    if (!this.builder) {
+      this.builder = new ContextGraphBuilder(
+        tokenCalculator,
+        this.nodeIdentityMap,
+      );
+    }
+
+    if (event.type === 'CLEAR') {
+      this.builder.clear();
+      return [];
+    }
+
+    if (event.type === 'SYNC_FULL') {
+      this.builder.clear();
+    }
+
+    this.builder.processHistory(event.payload);
+    return this.builder.getNodes();
   }
 
   fromGraph(nodes: readonly ConcreteNode[]): Content[] {
diff --git a/packages/core/src/context/graph/toGraph.ts b/packages/core/src/context/graph/toGraph.ts
index 7238c6ae5c..b4dcc78123 100644
--- a/packages/core/src/context/graph/toGraph.ts
+++ b/packages/core/src/context/graph/toGraph.ts
@@ -6,6 +6,7 @@
 
 import type { Content, Part } from '@google/genai';
 import type {
+  ConcreteNode,
   Episode,
   SemanticPart,
   ToolExecution,
@@ -38,61 +39,87 @@ function isCompleteEpisode(ep: Partial<Episode>): ep is Episode {
   );
 }
 
-export function toGraph(
-  history: readonly Content[],
-  tokenCalculator: ContextTokenCalculator,
-  nodeIdentityMap: WeakMap<object, string>,
-): Episode[] {
-  const episodes: Episode[] = [];
-  let currentEpisode: Partial<Episode> | null = null;
-  const pendingCallParts: Map<string, Part> = new Map();
+export class ContextGraphBuilder {
+  private episodes: Episode[] = [];
+  private currentEpisode: Partial<Episode> | null = null;
+  private pendingCallParts: Map<string, Part> = new Map();
 
-  const finalizeEpisode = () => {
-    if (currentEpisode && isCompleteEpisode(currentEpisode)) {
-      episodes.push(currentEpisode);
-    }
-    currentEpisode = null;
-  };
+  constructor(
+    private readonly tokenCalculator: ContextTokenCalculator,
+    private readonly nodeIdentityMap: WeakMap<object, string>,
+  ) {}
 
-  for (const msg of history) {
-    if (!msg.parts) continue;
+  clear() {
+    this.episodes = [];
+    this.currentEpisode = null;
+    this.pendingCallParts.clear();
+  }
 
-    if (msg.role === 'user') {
-      const hasToolResponses = msg.parts.some((p) => !!p.functionResponse);
-      const hasUserParts = msg.parts.some(
-        (p) => !!p.text || !!p.inlineData || !!p.fileData,
-      );
+  processHistory(history: readonly Content[]) {
+    const finalizeEpisode = () => {
+      if (this.currentEpisode && isCompleteEpisode(this.currentEpisode)) {
+        this.episodes.push(this.currentEpisode);
+      }
+      this.currentEpisode = null;
+    };
 
-      if (hasToolResponses) {
-        currentEpisode = parseToolResponses(
+    for (const msg of history) {
+      if (!msg.parts) continue;
+
+      if (msg.role === 'user') {
+        const hasToolResponses = msg.parts.some((p) => !!p.functionResponse);
+        const hasUserParts = msg.parts.some(
+          (p) => !!p.text || !!p.inlineData || !!p.fileData,
+        );
+
+        if (hasToolResponses) {
+          this.currentEpisode = parseToolResponses(
+            msg,
+            this.currentEpisode,
+            this.pendingCallParts,
+            this.tokenCalculator,
+            this.nodeIdentityMap,
+          );
+        }
+
+        if (hasUserParts) {
+          finalizeEpisode();
+          this.currentEpisode = parseUserParts(msg, this.nodeIdentityMap);
+        }
+      } else if (msg.role === 'model') {
+        this.currentEpisode = parseModelParts(
           msg,
-          currentEpisode,
-          pendingCallParts,
-          tokenCalculator,
-          nodeIdentityMap,
+          this.currentEpisode,
+          this.pendingCallParts,
+          this.nodeIdentityMap,
         );
       }
-
-      if (hasUserParts) {
-        finalizeEpisode();
-        currentEpisode = parseUserParts(msg, nodeIdentityMap);
-      }
-    } else if (msg.role === 'model') {
-      currentEpisode = parseModelParts(
-        msg,
-        currentEpisode,
-        pendingCallParts,
-        nodeIdentityMap,
-      );
     }
   }
 
-  if (currentEpisode) {
-    finalizeYield(currentEpisode);
-    finalizeEpisode();
-  }
+  getNodes(): ConcreteNode[] {
+    const copy = [...this.episodes];
+    if (this.currentEpisode) {
+      const activeEp = {
+        ...this.currentEpisode,
+        concreteNodes: [...(this.currentEpisode.concreteNodes || [])],
+      };
+      finalizeYield(activeEp);
+      if (isCompleteEpisode(activeEp)) {
+        copy.push(activeEp);
+      }
+    }
 
-  return episodes;
+    const nodes: ConcreteNode[] = [];
+    for (const ep of copy) {
+      if (ep.concreteNodes) {
+        for (const child of ep.concreteNodes) {
+          nodes.push(child);
+        }
+      }
+    }
+    return nodes;
+  }
 }
 
 function parseToolResponses(
diff --git a/packages/core/src/context/historyObserver.ts b/packages/core/src/context/historyObserver.ts
index 6c6b1ee94c..1deef3a1e1 100644
--- a/packages/core/src/context/historyObserver.ts
+++ b/packages/core/src/context/historyObserver.ts
@@ -39,24 +39,15 @@ export class HistoryObserver {
     }
 
     this.unsubscribeHistory = this.chatHistory.subscribe(
-      (_event: HistoryEvent) => {
-        // Rebuild the pristine Context Graph graph from the full source history on every change.
-        // Wait, toGraph still returns an Episode[].
-        // We actually need to map the Episode[] to a flat ConcreteNode[] here to form the 'nodes'.
-        const pristineEpisodes = this.graphMapper.toGraph(
-          this.chatHistory.get(),
-          this.tokenCalculator,
-        );
+      (event: HistoryEvent) => {
+        let nodes: ConcreteNode[] = [];
 
-        const nodes: ConcreteNode[] = [];
-        for (const ep of pristineEpisodes) {
-          if (ep.concreteNodes) {
-            for (const child of ep.concreteNodes) {
-              nodes.push(child);
-            }
-          }
+        if (event.type === 'CLEAR') {
+          this.seenNodeIds.clear();
         }
 
+        nodes = this.graphMapper.applyEvent(event, this.tokenCalculator);
+
         const newNodes = new Set<string>();
         for (const node of nodes) {
           if (!this.seenNodeIds.has(node.id)) {
@@ -67,7 +58,7 @@ export class HistoryObserver {
 
         this.tracer.logEvent(
           'HistoryObserver',
-          'Rebuilt pristine graph from chat history update',
+          `Rebuilt pristine graph from ${event.type} event`,
           { nodesSize: nodes.length, newNodesCount: newNodes.size },
         );
 
diff --git a/packages/core/src/context/initializer.ts b/packages/core/src/context/initializer.ts
new file mode 100644
index 0000000000..676ce093d0
--- /dev/null
+++ b/packages/core/src/context/initializer.ts
@@ -0,0 +1,117 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type { Config } from '../config/config.js';
+import type { GeminiChat } from '../core/geminiChat.js';
+import { ContextProcessorRegistry } from './config/registry.js';
+import { loadContextManagementConfig } from './config/configLoader.js';
+import { ContextTracer } from './tracer.js';
+import { ContextEventBus } from './eventBus.js';
+import { ContextEnvironmentImpl } from './pipeline/environmentImpl.js';
+import { PipelineOrchestrator } from './pipeline/orchestrator.js';
+import { ContextManager } from './contextManager.js';
+import { debugLogger } from '../utils/debugLogger.js';
+import { NodeTruncationProcessorOptionsSchema } from './processors/nodeTruncationProcessor.js';
+import { ToolMaskingProcessorOptionsSchema } from './processors/toolMaskingProcessor.js';
+import { HistoryTruncationProcessorOptionsSchema } from './processors/historyTruncationProcessor.js';
+import { BlobDegradationProcessorOptionsSchema } from './processors/blobDegradationProcessor.js';
+import { NodeDistillationProcessorOptionsSchema } from './processors/nodeDistillationProcessor.js';
+import { StateSnapshotProcessorOptionsSchema } from './processors/stateSnapshotProcessor.js';
+import { StateSnapshotAsyncProcessorOptionsSchema } from './processors/stateSnapshotAsyncProcessor.js';
+import { RollingSummaryProcessorOptionsSchema } from './processors/rollingSummaryProcessor.js';
+
+export async function initializeContextManager(
+  config: Config,
+  chat: GeminiChat,
+  lastPromptId: string,
+): Promise<ContextManager | undefined> {
+  const isV1Enabled = config.getContextManagementConfig().enabled;
+  debugLogger.log(
+    `[initializer] called with enabled=${isV1Enabled}, GEMINI_CONTEXT_TRACE_DIR=${process.env['GEMINI_CONTEXT_TRACE_DIR']}`,
+  );
+
+  if (!isV1Enabled) {
+    return undefined;
+  }
+
+  const registry = new ContextProcessorRegistry();
+  registry.registerProcessor({
+    id: 'NodeTruncationProcessor',
+    schema: NodeTruncationProcessorOptionsSchema,
+  });
+  registry.registerProcessor({
+    id: 'ToolMaskingProcessor',
+    schema: ToolMaskingProcessorOptionsSchema,
+  });
+  registry.registerProcessor({
+    id: 'HistoryTruncationProcessor',
+    schema: HistoryTruncationProcessorOptionsSchema,
+  });
+  registry.registerProcessor({
+    id: 'BlobDegradationProcessor',
+    schema: BlobDegradationProcessorOptionsSchema,
+  });
+  registry.registerProcessor({
+    id: 'NodeDistillationProcessor',
+    schema: NodeDistillationProcessorOptionsSchema,
+  });
+  registry.registerProcessor({
+    id: 'StateSnapshotProcessor',
+    schema: StateSnapshotProcessorOptionsSchema,
+  });
+  registry.registerProcessor({
+    id: 'StateSnapshotAsyncProcessor',
+    schema: StateSnapshotAsyncProcessorOptionsSchema,
+  });
+  registry.registerProcessor({
+    id: 'RollingSummaryProcessor',
+    schema: RollingSummaryProcessorOptionsSchema,
+  });
+
+  const sidecarProfile = await loadContextManagementConfig(
+    config.getExperimentalContextManagementConfig(),
+    registry,
+  );
+
+  const storage = config.storage;
+  const logDir = storage.getProjectTempLogsDir();
+  const projectTempDir = storage.getProjectTempDir();
+
+  const tracer = new ContextTracer({
+    enabled: !!process.env['GEMINI_CONTEXT_TRACE_DIR'],
+    targetDir: projectTempDir,
+    sessionId: lastPromptId,
+  });
+
+  const eventBus = new ContextEventBus();
+
+  const env = new ContextEnvironmentImpl(
+    config.getBaseLlmClient(),
+    config.getSessionId(),
+    lastPromptId,
+    logDir,
+    projectTempDir,
+    tracer,
+    4,
+    eventBus,
+  );
+
+  const orchestrator = new PipelineOrchestrator(
+    sidecarProfile.buildPipelines(env),
+    sidecarProfile.buildAsyncPipelines(env),
+    env,
+    eventBus,
+    tracer,
+  );
+
+  return new ContextManager(
+    sidecarProfile,
+    env,
+    tracer,
+    orchestrator,
+    chat.agentHistory,
+  );
+}
diff --git a/packages/core/src/context/pipeline/contextWorkingBuffer.test.ts b/packages/core/src/context/pipeline/contextWorkingBuffer.test.ts
index f866baefa2..874f1cf3ec 100644
--- a/packages/core/src/context/pipeline/contextWorkingBuffer.test.ts
+++ b/packages/core/src/context/pipeline/contextWorkingBuffer.test.ts
@@ -95,7 +95,7 @@ describe('ContextWorkingBufferImpl', () => {
     buffer = buffer.applyProcessorResult('Summarizer', [p1, p2], [summaryNode]);
 
     // p1 and p2 are removed, p3 remains, s1 is added
-    expect(buffer.nodes.map((n) => n.id)).toEqual(['p3', 's1']);
+    expect(buffer.nodes.map((n) => n.id)).toEqual(['s1', 'p3']);
 
     // Provenance lookup: The summary node should resolve to both p1 and p2!
     const roots = buffer.getPristineNodes('s1');
diff --git a/packages/core/src/context/pipeline/contextWorkingBuffer.ts b/packages/core/src/context/pipeline/contextWorkingBuffer.ts
index a1c9ab5697..cd9d82126a 100644
--- a/packages/core/src/context/pipeline/contextWorkingBuffer.ts
+++ b/packages/core/src/context/pipeline/contextWorkingBuffer.ts
@@ -107,13 +107,19 @@ export class ContextWorkingBufferImpl implements ContextWorkingBuffer {
 
     // Calculate new node array
     const removedSet = new Set(removedIds);
-    const retainedNodes = this.nodes.filter((n) => !removedSet.has(n.id));
-    const newGraph = [...retainedNodes];
 
-    // We append the output nodes in the same general position if possible,
-    // but in a complex graph we just ensure they exist. V2 graph uses timestamps for order.
-    // For simplicity, we just push added nodes to the end of the retained array
-    newGraph.push(...addedNodes);
+    const newGraph = this.nodes.filter((n) => !removedSet.has(n.id));
+    const insertionIndex = this.nodes.findIndex((n) => removedSet.has(n.id));
+
+    // IMPORTANT: We do NOT use structuredClone here.
+    // The ContextTokenCalculator relies on a WeakMap tied to exact object references
+    // for O(1) performance. Deep cloning would cause catastrophic cache misses.
+    // The pipeline enforces immutability, making reference passing safe.
+    if (insertionIndex !== -1) {
+      newGraph.splice(insertionIndex, 0, ...addedNodes);
+    } else {
+      newGraph.push(...addedNodes);
+    }
 
     // Calculate new provenance map
     const newProvenanceMap = new Map(this.provenanceMap);
diff --git a/packages/core/src/context/pipeline/orchestrator.ts b/packages/core/src/context/pipeline/orchestrator.ts
index e51a9f6f8a..44f4702209 100644
--- a/packages/core/src/context/pipeline/orchestrator.ts
+++ b/packages/core/src/context/pipeline/orchestrator.ts
@@ -204,6 +204,11 @@ export class PipelineOrchestrator {
           allowedTargets,
           returnedNodes,
         );
+        this.eventBus.emitProcessorResult({
+          processorId: processor.id,
+          targets: allowedTargets,
+          returnedNodes,
+        });
       } catch (error) {
         debugLogger.error(
           `Pipeline ${pipeline.name} failed async at ${processor.id}:`,
diff --git a/packages/core/src/context/system-tests/__snapshots__/lifecycle.golden.test.ts.snap b/packages/core/src/context/system-tests/__snapshots__/lifecycle.golden.test.ts.snap
index 8e5eff49c0..cc63c4c177 100644
--- a/packages/core/src/context/system-tests/__snapshots__/lifecycle.golden.test.ts.snap
+++ b/packages/core/src/context/system-tests/__snapshots__/lifecycle.golden.test.ts.snap
@@ -3,94 +3,6 @@
 exports[`System Lifecycle Golden Tests > Scenario 1: Organic Growth with Huge Tool Output & Images 1`] = `
 {
   "finalProjection": [
-    {
-      "parts": [
-        {
-          "text": "System Instructions",
-        },
-      ],
-      "role": "user",
-    },
-    {
-      "parts": [
-        {
-          "text": "Ack.",
-        },
-      ],
-      "role": "model",
-    },
-    {
-      "parts": [
-        {
-          "text": "Hello!",
-        },
-      ],
-      "role": "user",
-    },
-    {
-      "parts": [
-        {
-          "text": "Hi, how can I help?",
-        },
-      ],
-      "role": "model",
-    },
-    {
-      "parts": [
-        {
-          "text": "Read the logs.",
-        },
-      ],
-      "role": "user",
-    },
-    {
-      "parts": [
-        {
-          "functionCall": {
-            "args": {},
-            "id": "<UUID>",
-            "name": "run_shell_command",
-          },
-        },
-      ],
-      "role": "model",
-    },
-    {
-      "parts": [
-        {
-          "functionResponse": {
-            "id": "<UUID>",
-            "name": "run_shell_command",
-            "response": {
-              "output": "LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG 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LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG LOG ",
-            },
-          },
-        },
-      ],
-      "role": "user",
-    },
-    {
-      "parts": [
-        {
-          "text": "The logs are very long.",
-        },
-      ],
-      "role": "model",
-    },
-    {
-      "parts": [
-        {
-          "text": "Look at this architecture diagram:",
-        },
-        {
-          "inlineData": {
-            "data": "fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_fake_base64_data_",
-            "mimeType": "image/png",
-          },
-        },
-      ],
-      "role": "user",
-    },
     {
       "parts": [
         {
@@ -121,28 +33,28 @@ exports[`System Lifecycle Golden Tests > Scenario 1: Organic Growth with Huge To
   ],
   "tokenTrajectory": [
     {
-      "tokensAfterBackground": 34,
-      "tokensBeforeBackground": 34,
+      "tokensAfterBackground": 6,
+      "tokensBeforeBackground": 6,
       "turnIndex": 0,
     },
     {
-      "tokensAfterBackground": 64,
-      "tokensBeforeBackground": 64,
+      "tokensAfterBackground": 11,
+      "tokensBeforeBackground": 11,
       "turnIndex": 1,
     },
     {
-      "tokensAfterBackground": 25358,
-      "tokensBeforeBackground": 25358,
+      "tokensAfterBackground": 436,
+      "tokensBeforeBackground": 20148,
       "turnIndex": 2,
     },
     {
-      "tokensAfterBackground": 28674,
-      "tokensBeforeBackground": 28674,
+      "tokensAfterBackground": 61,
+      "tokensBeforeBackground": 3017,
       "turnIndex": 3,
     },
     {
-      "tokensAfterBackground": 28707,
-      "tokensBeforeBackground": 28707,
+      "tokensAfterBackground": 10,
+      "tokensBeforeBackground": 10,
       "turnIndex": 4,
     },
   ],
@@ -190,13 +102,13 @@ exports[`System Lifecycle Golden Tests > Scenario 2: Under Budget (No Modificati
   ],
   "tokenTrajectory": [
     {
-      "tokensAfterBackground": 34,
-      "tokensBeforeBackground": 34,
+      "tokensAfterBackground": 6,
+      "tokensBeforeBackground": 6,
       "turnIndex": 0,
     },
     {
-      "tokensAfterBackground": 64,
-      "tokensBeforeBackground": 64,
+      "tokensAfterBackground": 11,
+      "tokensBeforeBackground": 11,
       "turnIndex": 1,
     },
   ],
@@ -260,18 +172,18 @@ exports[`System Lifecycle Golden Tests > Scenario 3: Async-Driven Background GC
   ],
   "tokenTrajectory": [
     {
-      "tokensAfterBackground": 130,
-      "tokensBeforeBackground": 130,
+      "tokensAfterBackground": 25,
+      "tokensBeforeBackground": 25,
       "turnIndex": 0,
     },
     {
-      "tokensAfterBackground": 254,
-      "tokensBeforeBackground": 254,
+      "tokensAfterBackground": 49,
+      "tokensBeforeBackground": 49,
       "turnIndex": 1,
     },
     {
-      "tokensAfterBackground": 378,
-      "tokensBeforeBackground": 378,
+      "tokensAfterBackground": 73,
+      "tokensBeforeBackground": 73,
       "turnIndex": 2,
     },
   ],
diff --git a/packages/core/src/context/tracer.test.ts b/packages/core/src/context/tracer.test.ts
index 76176bd17c..884f2435a3 100644
--- a/packages/core/src/context/tracer.test.ts
+++ b/packages/core/src/context/tracer.test.ts
@@ -22,6 +22,7 @@ describe('ContextTracer (Real FS & Mock ID Gen)', () => {
   let tmpDir: string;
 
   beforeEach(async () => {
+    vi.stubEnv('GEMINI_CONTEXT_TRACE_DIR', '');
     tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'gemini-tracer-test-'));
 
     vi.useFakeTimers();
@@ -29,6 +30,7 @@ describe('ContextTracer (Real FS & Mock ID Gen)', () => {
   });
 
   afterEach(async () => {
+    vi.unstubAllEnvs();
     vi.useRealTimers();
     await fs.rm(tmpDir, { recursive: true, force: true });
   });
@@ -45,7 +47,9 @@ describe('ContextTracer (Real FS & Mock ID Gen)', () => {
     // Verify Initialization
     const traceLogPath = path.join(
       tmpDir,
-      '.gemini/context_trace/test-session/trace.log',
+      'context_trace',
+      'test-session',
+      'trace.log',
     );
     const initTraceLog = readFileSync(traceLogPath, 'utf-8');
     expect(initTraceLog).toContain('[SYSTEM] Context Tracer Initialized');
@@ -65,7 +69,10 @@ describe('ContextTracer (Real FS & Mock ID Gen)', () => {
 
     const expectedAssetPath = path.join(
       tmpDir,
-      '.gemini/context_trace/test-session/assets/1767268800020-mock-uuid-1-largeKey.json',
+      'context_trace',
+      'test-session',
+      'assets',
+      '1767268800020-mock-uuid-1-largeKey.json',
     );
     expect(existsSync(expectedAssetPath)).toBe(true);
 
diff --git a/packages/core/src/context/tracer.ts b/packages/core/src/context/tracer.ts
index 4f13dd21e4..ee81e663e8 100644
--- a/packages/core/src/context/tracer.ts
+++ b/packages/core/src/context/tracer.ts
@@ -25,12 +25,9 @@ export class ContextTracer {
   constructor(options: ContextTracerOptions) {
     this.enabled = options.enabled ?? false;
 
-    this.traceDir = path.join(
-      options.targetDir,
-      '.gemini',
-      'context_trace',
-      options.sessionId,
-    );
+    this.traceDir =
+      process.env['GEMINI_CONTEXT_TRACE_DIR'] ||
+      path.join(options.targetDir, 'context_trace', options.sessionId);
     this.assetsDir = path.join(this.traceDir, 'assets');
 
     if (this.enabled) {
diff --git a/packages/core/src/context/utils/contextTokenCalculator.ts b/packages/core/src/context/utils/contextTokenCalculator.ts
index aa808473ad..483cf917b2 100644
--- a/packages/core/src/context/utils/contextTokenCalculator.ts
+++ b/packages/core/src/context/utils/contextTokenCalculator.ts
@@ -5,7 +5,7 @@
  */
 
 import type { Part } from '@google/genai';
-import { estimateTokenCountSync as baseEstimate } from '../../utils/tokenCalculation.js';
+import { estimateTokenCountSync } from '../../utils/tokenCalculation.js';
 import type { ConcreteNode } from '../graph/types.js';
 import type { NodeBehaviorRegistry } from '../graph/behaviorRegistry.js';
 
@@ -84,24 +84,27 @@ export class ContextTokenCalculator {
     }
     return tokens;
   }
+
   /**
    * Slower, precise estimation for a Gemini Content/Part graph.
    * Deeply inspects the nested structure and uses the base tokenization math.
    */
-  estimateTokensForParts(parts: Part[], depth: number = 0): number {
-    let totalTokens = 0;
+  private readonly partTokenCache = new WeakMap<object, number>();
+
+  estimateTokensForParts(parts: Part[]): number {
+    let total = 0;
     for (const part of parts) {
-      if (typeof part.text === 'string') {
-        totalTokens += Math.ceil(part.text.length / this.charsPerToken);
-      } else if (part.inlineData !== undefined || part.fileData !== undefined) {
-        totalTokens += 258;
+      if (part !== null && typeof part === 'object') {
+        let cost = this.partTokenCache.get(part);
+        if (cost === undefined) {
+          cost = estimateTokenCountSync([part], 0, this.charsPerToken);
+          this.partTokenCache.set(part, cost);
+        }
+        total += cost;
       } else {
-        totalTokens += Math.ceil(
-          JSON.stringify(part).length / this.charsPerToken,
-        );
+        total += estimateTokenCountSync([part], 0, this.charsPerToken);
       }
     }
-    // Also include structural overhead
-    return totalTokens + baseEstimate(parts, depth);
+    return total;
   }
 }
diff --git a/packages/core/src/core/client.ts b/packages/core/src/core/client.ts
index 25509862fb..cb70923053 100644
--- a/packages/core/src/core/client.ts
+++ b/packages/core/src/core/client.ts
@@ -45,6 +45,7 @@ import type { ContentGenerator } from './contentGenerator.js';
 import { LoopDetectionService } from '../services/loopDetectionService.js';
 import { ChatCompressionService } from '../context/chatCompressionService.js';
 import { AgentHistoryProvider } from '../context/agentHistoryProvider.js';
+import type { ContextManager } from '../context/contextManager.js';
 import { ideContextStore } from '../ide/ideContext.js';
 import {
   logContentRetryFailure,
@@ -74,6 +75,7 @@ import {
 import { getDisplayString, resolveModel } from '../config/models.js';
 import { partToString } from '../utils/partUtils.js';
 import { coreEvents, CoreEvent } from '../utils/events.js';
+import { initializeContextManager } from '../context/initializer.js';
 
 const MAX_TURNS = 100;
 
@@ -97,6 +99,7 @@ export class GeminiClient {
   private readonly compressionService: ChatCompressionService;
   private readonly agentHistoryProvider: AgentHistoryProvider;
   private readonly toolOutputMaskingService: ToolOutputMaskingService;
+  private contextManager?: ContextManager;
   private lastPromptId: string;
   private currentSequenceModel: string | null = null;
   private lastSentIdeContext: IdeContext | undefined;
@@ -393,6 +396,11 @@ export class GeminiClient {
         },
       );
       await chat.initialize(resumedSessionData, 'main');
+      this.contextManager = await initializeContextManager(
+        this.config,
+        chat,
+        this.lastPromptId,
+      );
       return chat;
     } catch (error) {
       await reportError(
@@ -618,10 +626,12 @@ export class GeminiClient {
     const modelForLimitCheck = this._getActiveModelForCurrentTurn();
 
     if (this.config.getContextManagementConfig().enabled) {
-      const newHistory = await this.agentHistoryProvider.manageHistory(
-        this.getHistory(),
-        signal,
-      );
+      const newHistory = this.contextManager
+        ? await this.contextManager.renderHistory()
+        : await this.agentHistoryProvider.manageHistory(
+            this.getHistory(),
+            signal,
+          );
       if (newHistory.length !== this.getHistory().length) {
         this.getChat().setHistory(newHistory);
       }
diff --git a/packages/core/src/core/geminiChat.ts b/packages/core/src/core/geminiChat.ts
index c480c3800b..3ea2c60187 100644
--- a/packages/core/src/core/geminiChat.ts
+++ b/packages/core/src/core/geminiChat.ts
@@ -18,6 +18,7 @@ import {
   type GenerateContentConfig,
   type GenerateContentParameters,
 } from '@google/genai';
+import { AgentChatHistory } from './agentChatHistory.js';
 import { toParts } from '../code_assist/converter.js';
 import {
   retryWithBackoff,
@@ -248,19 +249,21 @@ export class GeminiChat {
   private sendPromise: Promise<void> = Promise.resolve();
   private readonly chatRecordingService: ChatRecordingService;
   private lastPromptTokenCount: number;
+  agentHistory: AgentChatHistory;
 
   constructor(
     private readonly context: AgentLoopContext,
     private systemInstruction: string = '',
     private tools: Tool[] = [],
-    private history: Content[] = [],
+    history: Content[] = [],
     resumedSessionData?: ResumedSessionData,
     private readonly onModelChanged?: (modelId: string) => Promise<Tool[]>,
   ) {
     validateHistory(history);
+    this.agentHistory = new AgentChatHistory(history);
     this.chatRecordingService = new ChatRecordingService(context);
     this.lastPromptTokenCount = estimateTokenCountSync(
-      this.history.flatMap((c) => c.parts || []),
+      this.agentHistory.flatMap((c) => c.parts || []),
     );
   }
 
@@ -347,7 +350,7 @@ export class GeminiChat {
     }
 
     // Add user content to history ONCE before any attempts.
-    this.history.push(userContent);
+    this.agentHistory.push(userContent);
     const requestContents = this.getHistory(true);
 
     const streamWithRetries = async function* (
@@ -747,8 +750,8 @@ export class GeminiChat {
    */
   getHistory(curated: boolean = false): readonly Content[] {
     const history = curated
-      ? extractCuratedHistory(this.history)
-      : this.history;
+      ? extractCuratedHistory([...this.agentHistory.get()])
+      : this.agentHistory.get();
     return [...history];
   }
 
@@ -756,26 +759,26 @@ export class GeminiChat {
    * Clears the chat history.
    */
   clearHistory(): void {
-    this.history = [];
+    this.agentHistory.clear();
   }
 
   /**
    * Adds a new entry to the chat history.
    */
   addHistory(content: Content): void {
-    this.history.push(content);
+    this.agentHistory.push(content);
   }
 
   setHistory(history: readonly Content[]): void {
-    this.history = [...history];
+    this.agentHistory.set(history);
     this.lastPromptTokenCount = estimateTokenCountSync(
-      this.history.flatMap((c) => c.parts || []),
+      this.agentHistory.flatMap((c) => c.parts || []),
     );
     this.chatRecordingService.updateMessagesFromHistory(history);
   }
 
   stripThoughtsFromHistory(): void {
-    this.history = this.history.map((content) => {
+    this.agentHistory.map((content) => {
       const newContent = { ...content };
       if (newContent.parts) {
         newContent.parts = newContent.parts.map((part) => {
@@ -1013,7 +1016,7 @@ export class GeminiChat {
       }
     }
 
-    this.history.push({ role: 'model', parts: consolidatedParts });
+    this.agentHistory.push({ role: 'model', parts: consolidatedParts });
   }
 
   getLastPromptTokenCount(): number {
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 62a0b127bd..62246829ac 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -293,4 +293,9 @@ export type { Content, Part, FunctionCall } from '@google/genai';
 
 // Export context types and profiles
 export * from './context/types.js';
-export * from './context/profiles.js';
+
+export { generalistProfile as legacyGeneralistProfile } from './context/profiles.js';
+export {
+  generalistProfile,
+  stressTestProfile,
+} from './context/config/profiles.js';
diff --git a/packages/core/src/utils/tokenCalculation.ts b/packages/core/src/utils/tokenCalculation.ts
index b61b7cbb5d..a1115bcf74 100644
--- a/packages/core/src/utils/tokenCalculation.ts
+++ b/packages/core/src/utils/tokenCalculation.ts
@@ -29,12 +29,14 @@ const MAX_CHARS_FOR_FULL_HEURISTIC = 100_000;
 // standard multimodal responses are typically depth 1.
 const MAX_RECURSION_DEPTH = 3;
 
+const DEFAULT_CHARS_PER_TOKEN = 4;
+
 /**
  * Heuristic estimation of tokens for a text string.
  */
-function estimateTextTokens(text: string): number {
+function estimateTextTokens(text: string, charsPerToken: number): number {
   if (text.length > MAX_CHARS_FOR_FULL_HEURISTIC) {
-    return text.length / 4;
+    return text.length / charsPerToken;
   }
 
   let tokens = 0;
@@ -73,25 +75,33 @@ function estimateMediaTokens(part: Part): number | undefined {
  * Heuristic estimation for tool responses, avoiding massive string copies
  * and accounting for nested Gemini 3 multimodal parts.
  */
-function estimateFunctionResponseTokens(part: Part, depth: number): number {
+function estimateFunctionResponseTokens(
+  part: Part,
+  depth: number,
+  charsPerToken: number,
+): number {
   const fr = part.functionResponse;
   if (!fr) return 0;
 
-  let totalTokens = (fr.name?.length ?? 0) / 4;
+  let totalTokens = (fr.name?.length ?? 0) / charsPerToken;
   const response = fr.response as unknown;
 
   if (typeof response === 'string') {
-    totalTokens += response.length / 4;
+    totalTokens += response.length / charsPerToken;
   } else if (response !== undefined && response !== null) {
     // For objects, stringify only the payload, not the whole Part object.
-    totalTokens += JSON.stringify(response).length / 4;
+    totalTokens += JSON.stringify(response).length / charsPerToken;
   }
 
   // Gemini 3: Handle nested multimodal parts recursively.
   // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
   const nestedParts = (fr as unknown as { parts?: Part[] }).parts;
   if (nestedParts && nestedParts.length > 0) {
-    totalTokens += estimateTokenCountSync(nestedParts, depth + 1);
+    totalTokens += estimateTokenCountSync(
+      nestedParts,
+      depth + 1,
+      charsPerToken,
+    );
   }
 
   return totalTokens;
@@ -100,11 +110,12 @@ function estimateFunctionResponseTokens(part: Part, depth: number): number {
 /**
  * Estimates token count for parts synchronously using a heuristic.
  * - Text: character-based heuristic (ASCII vs CJK) for small strings, length/4 for massive ones.
- * - Non-text (Tools, etc): JSON string length / 4.
+ * - Non-text (Tools, etc): JSON string length / charsPerToken.
  */
 export function estimateTokenCountSync(
   parts: Part[],
   depth: number = 0,
+  charsPerToken: number = DEFAULT_CHARS_PER_TOKEN,
 ): number {
   if (depth > MAX_RECURSION_DEPTH) {
     return 0;
@@ -113,9 +124,9 @@ export function estimateTokenCountSync(
   let totalTokens = 0;
   for (const part of parts) {
     if (typeof part.text === 'string') {
-      totalTokens += estimateTextTokens(part.text);
+      totalTokens += estimateTextTokens(part.text, charsPerToken);
     } else if (part.functionResponse) {
-      totalTokens += estimateFunctionResponseTokens(part, depth);
+      totalTokens += estimateFunctionResponseTokens(part, depth, charsPerToken);
     } else {
       const mediaEstimate = estimateMediaTokens(part);
       if (mediaEstimate !== undefined) {
@@ -123,7 +134,7 @@ export function estimateTokenCountSync(
       } else {
         // Fallback for other non-text parts (e.g., functionCall).
         // Note: JSON.stringify(part) here is safe as these parts are typically small.
-        totalTokens += JSON.stringify(part).length / 4;
+        totalTokens += JSON.stringify(part).length / charsPerToken;
       }
     }
   }
@@ -162,9 +173,9 @@ export async function calculateRequestTokenCount(
     } catch (error) {
       // Fallback to local estimation if the API call fails
       debugLogger.debug('countTokens API failed:', error);
-      return estimateTokenCountSync(parts);
+      return estimateTokenCountSync(parts, 0, DEFAULT_CHARS_PER_TOKEN);
     }
   }
 
-  return estimateTokenCountSync(parts);
+  return estimateTokenCountSync(parts, 0, DEFAULT_CHARS_PER_TOKEN);
 }
diff --git a/schemas/settings.schema.json b/schemas/settings.schema.json
index 491db887a4..05be4e0b3c 100644
--- a/schemas/settings.schema.json
+++ b/schemas/settings.schema.json
@@ -2954,6 +2954,13 @@
           "default": false,
           "type": "boolean"
         },
+        "stressTestProfile": {
+          "title": "Use the stress test profile to aggressively trigger context management.",
+          "description": "Significantly lowers token limits to force early garbage collection and distillation for testing purposes.",
+          "markdownDescription": "Significantly lowers token limits to force early garbage collection and distillation for testing purposes.\n\n- Category: `Experimental`\n- Requires restart: `yes`\n- Default: `false`",
+          "default": false,
+          "type": "boolean"
+        },
         "autoMemory": {
           "title": "Auto Memory",
           "description": "Automatically extract reusable skills from past sessions in the background. Review results with /memory inbox.",