diff --git a/apps/x/apps/main/src/main.ts b/apps/x/apps/main/src/main.ts
index 9b89f033..3b8b70c8 100644
--- a/apps/x/apps/main/src/main.ts
+++ b/apps/x/apps/main/src/main.ts
@@ -21,6 +21,7 @@ import { init as initEmailLabeling } from "@x/core/dist/knowledge/label_emails.j
 import { init as initNoteTagging } from "@x/core/dist/knowledge/tag_notes.js";
 import { init as initInlineTasks } from "@x/core/dist/knowledge/inline_tasks.js";
 import { init as initAgentRunner } from "@x/core/dist/agent-schedule/runner.js";
+import { init as initAgentNotes } from "@x/core/dist/knowledge/agent_notes.js";
 import { initConfigs } from "@x/core/dist/config/initConfigs.js";
 import started from "electron-squirrel-startup";
 import { execSync } from "node:child_process";
@@ -230,6 +231,9 @@ app.whenReady().then(async () => {
   // start background agent runner (scheduled agents)
   initAgentRunner();
 
+  // start agent notes learning service
+  initAgentNotes();
+
   app.on("activate", () => {
     if (BrowserWindow.getAllWindows().length === 0) {
       createWindow();
diff --git a/apps/x/packages/core/src/knowledge/agent_notes.ts b/apps/x/packages/core/src/knowledge/agent_notes.ts
new file mode 100644
index 00000000..2d783537
--- /dev/null
+++ b/apps/x/packages/core/src/knowledge/agent_notes.ts
@@ -0,0 +1,453 @@
+import fs from 'fs';
+import path from 'path';
+import { generateText } from 'ai';
+import { WorkDir } from '../config/config.js';
+import container from '../di/container.js';
+import type { IModelConfigRepo } from '../models/repo.js';
+import { createProvider } from '../models/models.js';
+import { isSignedIn } from '../account/account.js';
+import { getGatewayProvider } from '../models/gateway.js';
+import { serviceLogger } from '../services/service_logger.js';
+import { loadUserConfig } from '../pre_built/config.js';
+import {
+    loadAgentNotesState,
+    saveAgentNotesState,
+    markEmailProcessed,
+    markRunProcessed,
+    type AgentNotesState,
+} from './agent_notes_state.js';
+
+const SYNC_INTERVAL_MS = 30 * 60 * 1000; // 30 minutes
+const EMAIL_BATCH_SIZE = 5;
+const GMAIL_SYNC_DIR = path.join(WorkDir, 'gmail_sync');
+const RUNS_DIR = path.join(WorkDir, 'runs');
+const AGENT_NOTES_DIR = path.join(WorkDir, 'knowledge', 'agent-notes');
+const STYLE_DIR = path.join(AGENT_NOTES_DIR, 'style');
+
+const NOTE_FILES = {
+    preferences: path.join(AGENT_NOTES_DIR, 'preferences.md'),
+    writingStyle: path.join(STYLE_DIR, 'writing.md'),
+    emailStyle: path.join(STYLE_DIR, 'email.md'),
+    slackStyle: path.join(STYLE_DIR, 'slack.md'),
+    documentsStyle: path.join(STYLE_DIR, 'documents.md'),
+    people: path.join(AGENT_NOTES_DIR, 'people.md'),
+    routines: path.join(AGENT_NOTES_DIR, 'routines.md'),
+};
+
+// --- LLM helpers ---
+
+async function getModel() {
+    const repo = container.resolve<IModelConfigRepo>('modelConfigRepo');
+    const config = await repo.getConfig();
+    const provider = await isSignedIn()
+        ? await getGatewayProvider()
+        : createProvider(config.provider);
+    const modelId = config.knowledgeGraphModel || config.model;
+    return provider.languageModel(modelId);
+}
+
+function stripCodeFences(text: string): string {
+    return text
+        .replace(/^```(?:markdown|md)?\s*\n?/, '')
+        .replace(/\n?```\s*$/, '')
+        .trim();
+}
+
+// --- File helpers ---
+
+function ensureAgentNotesDir(): void {
+    for (const dir of [AGENT_NOTES_DIR, STYLE_DIR]) {
+        if (!fs.existsSync(dir)) {
+            fs.mkdirSync(dir, { recursive: true });
+        }
+    }
+}
+
+function readNoteFile(filePath: string): string {
+    try {
+        if (fs.existsSync(filePath)) {
+            return fs.readFileSync(filePath, 'utf-8');
+        }
+    } catch { /* ignore */ }
+    return '';
+}
+
+// --- Email scanning ---
+
+function findUserSentEmails(
+    state: AgentNotesState,
+    userEmail: string,
+    limit: number,
+): string[] {
+    if (!fs.existsSync(GMAIL_SYNC_DIR)) {
+        return [];
+    }
+
+    const results: { path: string; mtime: number }[] = [];
+    const userEmailLower = userEmail.toLowerCase();
+
+    function traverse(dir: string) {
+        const entries = fs.readdirSync(dir);
+        for (const entry of entries) {
+            const fullPath = path.join(dir, entry);
+            const stat = fs.statSync(fullPath);
+
+            if (stat.isDirectory()) {
+                if (entry !== 'attachments') {
+                    traverse(fullPath);
+                }
+            } else if (stat.isFile() && entry.endsWith('.md')) {
+                if (state.processedEmails[fullPath]) {
+                    continue;
+                }
+
+                try {
+                    const content = fs.readFileSync(fullPath, 'utf-8');
+                    // Check if any From header contains the user's email
+                    const fromLines = content.match(/^### From:.*$/gm);
+                    if (fromLines?.some(line => line.toLowerCase().includes(userEmailLower))) {
+                        results.push({ path: fullPath, mtime: stat.mtimeMs });
+                    }
+                } catch {
+                    continue;
+                }
+            }
+        }
+    }
+
+    traverse(GMAIL_SYNC_DIR);
+
+    // Sort by mtime descending (newest first), return up to limit
+    results.sort((a, b) => b.mtime - a.mtime);
+    return results.slice(0, limit).map(r => r.path);
+}
+
+function extractUserPartsFromEmail(content: string, userEmail: string): string | null {
+    const userEmailLower = userEmail.toLowerCase();
+    // Split by message separator
+    const sections = content.split(/^---$/m);
+    const userSections: string[] = [];
+
+    for (const section of sections) {
+        const fromMatch = section.match(/^### From:.*$/m);
+        if (fromMatch && fromMatch[0].toLowerCase().includes(userEmailLower)) {
+            userSections.push(section.trim());
+        }
+    }
+
+    return userSections.length > 0 ? userSections.join('\n\n---\n\n') : null;
+}
+
+// --- Run scanning ---
+
+function findNewCopilotRuns(state: AgentNotesState): string[] {
+    if (!fs.existsSync(RUNS_DIR)) {
+        return [];
+    }
+
+    const results: string[] = [];
+    const files = fs.readdirSync(RUNS_DIR).filter(f => f.endsWith('.jsonl'));
+
+    for (const file of files) {
+        if (state.processedRuns[file]) {
+            continue;
+        }
+
+        try {
+            const fullPath = path.join(RUNS_DIR, file);
+            const fd = fs.openSync(fullPath, 'r');
+            const buf = Buffer.alloc(512);
+            const bytesRead = fs.readSync(fd, buf, 0, 512, 0);
+            fs.closeSync(fd);
+
+            const firstLine = buf.subarray(0, bytesRead).toString('utf-8').split('\n')[0];
+            const event = JSON.parse(firstLine);
+            if (event.agentName === 'copilot') {
+                results.push(file);
+            }
+        } catch {
+            continue;
+        }
+    }
+
+    // Sort chronologically (filenames are timestamps)
+    results.sort();
+    return results;
+}
+
+function extractUserMessages(runFilePath: string): string[] {
+    const messages: string[] = [];
+    try {
+        const content = fs.readFileSync(runFilePath, 'utf-8');
+        const lines = content.split('\n').filter(l => l.trim());
+
+        for (const line of lines) {
+            try {
+                const event = JSON.parse(line);
+                if (event.type === 'message' && event.message?.role === 'user') {
+                    const msgContent = event.message.content;
+                    if (typeof msgContent === 'string' && msgContent.trim()) {
+                        messages.push(msgContent.trim());
+                    } else if (Array.isArray(msgContent)) {
+                        // Handle array content format (text parts)
+                        const text = msgContent
+                            .filter((p: { type: string }) => p.type === 'text')
+                            .map((p: { text: string }) => p.text)
+                            .join('\n');
+                        if (text.trim()) {
+                            messages.push(text.trim());
+                        }
+                    }
+                }
+            } catch {
+                continue;
+            }
+        }
+    } catch {
+        // ignore
+    }
+    return messages;
+}
+
+// --- Note file updates (single LLM call per file) ---
+
+async function updateNoteFile(
+    filePath: string,
+    noteDescription: string,
+    sourceContent: string,
+): Promise<void> {
+    const model = await getModel();
+    const existing = readNoteFile(filePath);
+
+    const system = `You maintain a personal knowledge file about a user. Your job is to update this file by integrating new source material.
+
+Rules:
+- Preserve all existing content that is still relevant
+- Add new insights from the source material
+- Deduplicate: if an insight is already captured, do not add it again
+- Refine existing observations when new evidence supports a more nuanced version
+- Keep the file well-organized with clear markdown headings and bullet points
+- Be concise — prefer bullet points over paragraphs
+- If the file is empty, create initial structure appropriate for: ${noteDescription}
+- Output ONLY the complete updated file content, no commentary or explanation`;
+
+    const prompt = `## Current file content:
+${existing || '(empty — this is a new file)'}
+
+## New source material to integrate:
+${sourceContent}
+
+Return the complete updated file:`;
+
+    const result = await generateText({ model, system, prompt });
+    const text = stripCodeFences(result.text);
+    fs.writeFileSync(filePath, text);
+}
+
+// --- Email style processing ---
+
+async function updateEmailStyle(
+    emailFiles: { path: string; content: string }[],
+    userName: string,
+    userEmail: string,
+): Promise<void> {
+    // Build source content from user-sent email parts
+    let sourceContent = `Emails written by ${userName}:\n\n`;
+    for (const file of emailFiles) {
+        const userParts = extractUserPartsFromEmail(file.content, userEmail);
+        if (userParts) {
+            sourceContent += `---\n${userParts}\n---\n\n`;
+        }
+    }
+
+    await updateNoteFile(
+        NOTE_FILES.emailStyle,
+        'Email writing style patterns — voice, tone, formatting, sign-offs, bucketed by recipient context. Include concrete examples.',
+        sourceContent,
+    );
+
+    await updateNoteFile(
+        NOTE_FILES.writingStyle,
+        'General voice and tone patterns across all writing',
+        sourceContent,
+    );
+}
+
+// --- Copilot run processing ---
+
+async function updateFromCopilotRuns(runFiles: string[]): Promise<void> {
+    // Collect user messages from all new runs
+    let allUserMessages: string[] = [];
+    for (const runFile of runFiles) {
+        const msgs = extractUserMessages(path.join(RUNS_DIR, runFile));
+        allUserMessages.push(...msgs);
+    }
+
+    if (allUserMessages.length === 0) {
+        return;
+    }
+
+    // Cap to avoid massive prompts
+    if (allUserMessages.length > 20) {
+        allUserMessages = allUserMessages.slice(-20);
+    }
+
+    const sourceContent = `User messages from recent AI assistant conversations:\n\n${allUserMessages.map((m, i) => `${i + 1}. ${m}`).join('\n\n')}`;
+
+    // Update preferences
+    await updateNoteFile(
+        NOTE_FILES.preferences,
+        'Hard rules and explicit preferences the user has stated — always loaded for context',
+        sourceContent,
+    );
+
+    // Update people context
+    await updateNoteFile(
+        NOTE_FILES.people,
+        'Per-person relationship context, tone preferences, and interaction notes',
+        sourceContent,
+    );
+
+    // Update routines
+    await updateNoteFile(
+        NOTE_FILES.routines,
+        'Scheduling patterns, workflow habits, recurring tasks',
+        sourceContent,
+    );
+}
+
+// --- Main processing ---
+
+async function processAgentNotes(): Promise<void> {
+    const userConfig = loadUserConfig();
+    if (!userConfig) {
+        console.log('[AgentNotes] No user config found, skipping');
+        return;
+    }
+
+    ensureAgentNotesDir();
+    const state = loadAgentNotesState();
+
+    const run = await serviceLogger.startRun({
+        service: 'agent_notes',
+        message: 'Processing agent notes',
+        trigger: 'timer',
+    });
+
+    let hadError = false;
+    let emailsProcessed = 0;
+    let runsProcessed = 0;
+
+    // --- Email Style Learning ---
+    try {
+        const emailPaths = findUserSentEmails(state, userConfig.email, EMAIL_BATCH_SIZE);
+        if (emailPaths.length > 0) {
+            console.log(`[AgentNotes] Found ${emailPaths.length} new emails with user content`);
+            await serviceLogger.log({
+                type: 'progress',
+                service: run.service,
+                runId: run.runId,
+                level: 'info',
+                message: `Analyzing ${emailPaths.length} emails for style`,
+                step: 'email_style',
+                current: 1,
+                total: 2,
+            });
+
+            const emailFiles = emailPaths.map(p => ({
+                path: p,
+                content: fs.readFileSync(p, 'utf-8'),
+            }));
+
+            await updateEmailStyle(emailFiles, userConfig.name, userConfig.email);
+
+            for (const p of emailPaths) {
+                markEmailProcessed(p, state);
+            }
+            saveAgentNotesState(state);
+            emailsProcessed = emailPaths.length;
+        }
+    } catch (error) {
+        hadError = true;
+        console.error('[AgentNotes] Error processing emails:', error);
+        await serviceLogger.log({
+            type: 'error',
+            service: run.service,
+            runId: run.runId,
+            level: 'error',
+            message: 'Error processing email style',
+            error: error instanceof Error ? error.message : String(error),
+        });
+    }
+
+    // --- Chat Run Learning ---
+    try {
+        const newRuns = findNewCopilotRuns(state);
+        if (newRuns.length > 0) {
+            console.log(`[AgentNotes] Found ${newRuns.length} new copilot runs`);
+            await serviceLogger.log({
+                type: 'progress',
+                service: run.service,
+                runId: run.runId,
+                level: 'info',
+                message: `Analyzing ${newRuns.length} copilot runs`,
+                step: 'chat_runs',
+                current: 2,
+                total: 2,
+            });
+
+            await updateFromCopilotRuns(newRuns);
+
+            for (const r of newRuns) {
+                markRunProcessed(r, state);
+            }
+            saveAgentNotesState(state);
+            runsProcessed = newRuns.length;
+        }
+    } catch (error) {
+        hadError = true;
+        console.error('[AgentNotes] Error processing runs:', error);
+        await serviceLogger.log({
+            type: 'error',
+            service: run.service,
+            runId: run.runId,
+            level: 'error',
+            message: 'Error processing copilot runs',
+            error: error instanceof Error ? error.message : String(error),
+        });
+    }
+
+    state.lastRunTime = new Date().toISOString();
+    saveAgentNotesState(state);
+
+    await serviceLogger.log({
+        type: 'run_complete',
+        service: run.service,
+        runId: run.runId,
+        level: hadError ? 'error' : 'info',
+        message: 'Agent notes processing complete',
+        durationMs: Date.now() - run.startedAt,
+        outcome: hadError ? 'error' : 'ok',
+        summary: { emailsProcessed, runsProcessed },
+    });
+}
+
+// --- Entry point ---
+
+export async function init() {
+    console.log('[AgentNotes] Starting Agent Notes Service...');
+    console.log(`[AgentNotes] Will process every ${SYNC_INTERVAL_MS / 60000} minutes`);
+
+    // Initial run
+    await processAgentNotes();
+
+    // Periodic polling
+    while (true) {
+        await new Promise(resolve => setTimeout(resolve, SYNC_INTERVAL_MS));
+        try {
+            await processAgentNotes();
+        } catch (error) {
+            console.error('[AgentNotes] Error in main loop:', error);
+        }
+    }
+}
diff --git a/apps/x/packages/core/src/knowledge/agent_notes_state.ts b/apps/x/packages/core/src/knowledge/agent_notes_state.ts
new file mode 100644
index 00000000..93d1bae1
--- /dev/null
+++ b/apps/x/packages/core/src/knowledge/agent_notes_state.ts
@@ -0,0 +1,57 @@
+import fs from 'fs';
+import path from 'path';
+import { WorkDir } from '../config/config.js';
+
+const STATE_FILE = path.join(WorkDir, 'agent_notes_state.json');
+
+export interface AgentNotesState {
+    processedEmails: Record<string, { processedAt: string }>;
+    processedRuns: Record<string, { processedAt: string }>;
+    lastRunTime: string;
+}
+
+export function loadAgentNotesState(): AgentNotesState {
+    if (fs.existsSync(STATE_FILE)) {
+        try {
+            return JSON.parse(fs.readFileSync(STATE_FILE, 'utf-8'));
+        } catch (error) {
+            console.error('Error loading agent notes state:', error);
+        }
+    }
+
+    return {
+        processedEmails: {},
+        processedRuns: {},
+        lastRunTime: new Date(0).toISOString(),
+    };
+}
+
+export function saveAgentNotesState(state: AgentNotesState): void {
+    try {
+        fs.writeFileSync(STATE_FILE, JSON.stringify(state, null, 2));
+    } catch (error) {
+        console.error('Error saving agent notes state:', error);
+        throw error;
+    }
+}
+
+export function markEmailProcessed(filePath: string, state: AgentNotesState): void {
+    state.processedEmails[filePath] = {
+        processedAt: new Date().toISOString(),
+    };
+}
+
+export function markRunProcessed(runFile: string, state: AgentNotesState): void {
+    state.processedRuns[runFile] = {
+        processedAt: new Date().toISOString(),
+    };
+}
+
+export function resetAgentNotesState(): void {
+    const emptyState: AgentNotesState = {
+        processedEmails: {},
+        processedRuns: {},
+        lastRunTime: new Date().toISOString(),
+    };
+    saveAgentNotesState(emptyState);
+}
diff --git a/apps/x/packages/shared/src/service-events.ts b/apps/x/packages/shared/src/service-events.ts
index 807bc063..b7a7c579 100644
--- a/apps/x/packages/shared/src/service-events.ts
+++ b/apps/x/packages/shared/src/service-events.ts
@@ -9,6 +9,7 @@ export const ServiceName = z.enum([
   'voice_memo',
   'email_labeling',
   'note_tagging',
+  'agent_notes',
 ]);
 
 const ServiceEventBase = z.object({