diff --git a/apps/x/apps/main/src/main.ts b/apps/x/apps/main/src/main.ts
index 42b6a31e..5405163e 100644
--- a/apps/x/apps/main/src/main.ts
+++ b/apps/x/apps/main/src/main.ts
@@ -5,6 +5,7 @@ import { fileURLToPath } from "node:url";
 import { dirname } from "node:path";
 import { init as initGmailSync } from "@x/core/dist/knowledge/sync_gmail.js";
 import { init as initCalendarSync } from "@x/core/dist/knowledge/sync_calendar.js";
+import { init as initFirefliesSync } from "@x/core/dist/knowledge/sync_fireflies.js";
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
@@ -50,6 +51,9 @@ app.whenReady().then(() => {
   // start calendar sync
   initCalendarSync();
 
+  // start fireflies sync
+  initFirefliesSync();
+
   app.on('activate', () => {
     if (BrowserWindow.getAllWindows().length === 0) {
       createWindow();
diff --git a/apps/x/packages/core/src/knowledge/fireflies-client-factory.ts b/apps/x/packages/core/src/knowledge/fireflies-client-factory.ts
new file mode 100644
index 00000000..a56d39b5
--- /dev/null
+++ b/apps/x/packages/core/src/knowledge/fireflies-client-factory.ts
@@ -0,0 +1,210 @@
+import { Client } from "@modelcontextprotocol/sdk/client";
+import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js";
+import container from '../di/container.js';
+import { IOAuthRepo } from '../auth/repo.js';
+import { IClientRegistrationRepo } from '../auth/client-repo.js';
+import { getProviderConfig } from '../auth/providers.js';
+import * as oauthClient from '../auth/oauth-client.js';
+import type { Configuration } from '../auth/oauth-client.js';
+import { OAuthTokens } from '../auth/types.js';
+
+const FIREFLIES_MCP_URL = 'https://api.fireflies.ai/mcp';
+
+/**
+ * Factory for creating and managing Fireflies MCP client instances.
+ * Handles OAuth token management and client creation for Fireflies API.
+ */
+export class FirefliesClientFactory {
+    private static readonly PROVIDER_NAME = 'fireflies-ai';
+    private static cache: {
+        config: Configuration | null;
+        client: Client | null;
+        tokens: OAuthTokens | null;
+    } = {
+        config: null,
+        client: null,
+        tokens: null,
+    };
+
+    /**
+     * Get or create MCP Client for Fireflies, reusing cached instance when possible
+     */
+    static async getClient(): Promise<Client | null> {
+        const oauthRepo = container.resolve<IOAuthRepo>('oauthRepo');
+        const tokens = await oauthRepo.getTokens(this.PROVIDER_NAME);
+
+        if (!tokens) {
+            this.clearCache();
+            return null;
+        }
+
+        // Initialize config cache if needed (for token refresh)
+        await this.initializeConfigCache();
+        if (!this.cache.config) {
+            return null;
+        }
+
+        // Check if token is expired
+        if (oauthClient.isTokenExpired(tokens)) {
+            // Token expired, try to refresh
+            if (!tokens.refresh_token) {
+                console.log("[Fireflies] Token expired and no refresh token available.");
+                this.clearCache();
+                return null;
+            }
+
+            try {
+                console.log(`[Fireflies] Token expired, refreshing access token...`);
+                const existingScopes = tokens.scopes;
+                const refreshedTokens = await oauthClient.refreshTokens(
+                    this.cache.config,
+                    tokens.refresh_token,
+                    existingScopes
+                );
+                await oauthRepo.saveTokens(this.PROVIDER_NAME, refreshedTokens);
+
+                // Update cached tokens and recreate client
+                this.cache.tokens = refreshedTokens;
+                
+                // Close existing client if any
+                if (this.cache.client) {
+                    await this.cache.client.close().catch(() => {});
+                }
+                
+                this.cache.client = await this.createMcpClient(refreshedTokens);
+                console.log(`[Fireflies] Token refreshed successfully`);
+                return this.cache.client;
+            } catch (error) {
+                console.error("[Fireflies] Failed to refresh token:", error);
+                this.clearCache();
+                return null;
+            }
+        }
+
+        // Reuse client if tokens haven't changed
+        if (this.cache.client && this.cache.tokens && this.cache.tokens.access_token === tokens.access_token) {
+            return this.cache.client;
+        }
+
+        // Create new client with current tokens
+        console.log(`[Fireflies] Creating new MCP client instance`);
+        this.cache.tokens = tokens;
+        
+        // Close existing client if any
+        if (this.cache.client) {
+            await this.cache.client.close().catch(() => {});
+        }
+        
+        this.cache.client = await this.createMcpClient(tokens);
+        return this.cache.client;
+    }
+
+    /**
+     * Check if credentials are available
+     */
+    static async hasValidCredentials(): Promise<boolean> {
+        const oauthRepo = container.resolve<IOAuthRepo>('oauthRepo');
+        const isConnected = await oauthRepo.isConnected(this.PROVIDER_NAME);
+
+        if (!isConnected) {
+            return false;
+        }
+
+        const tokens = await oauthRepo.getTokens(this.PROVIDER_NAME);
+        return tokens !== null;
+    }
+
+    /**
+     * Clear cache (useful for testing or when credentials are revoked)
+     */
+    static async clearCache(): Promise<void> {
+        console.log(`[Fireflies] Clearing auth cache`);
+        
+        if (this.cache.client) {
+            await this.cache.client.close().catch(() => {});
+        }
+        
+        this.cache.config = null;
+        this.cache.client = null;
+        this.cache.tokens = null;
+    }
+
+    /**
+     * Initialize cached configuration (called once)
+     */
+    private static async initializeConfigCache(): Promise<void> {
+        if (this.cache.config) {
+            return; // Already initialized
+        }
+
+        console.log(`[Fireflies] Initializing OAuth configuration...`);
+        const providerConfig = getProviderConfig(this.PROVIDER_NAME);
+
+        if (providerConfig.discovery.mode === 'issuer') {
+            if (providerConfig.client.mode === 'static') {
+                // Discover endpoints, use static client ID
+                console.log(`[Fireflies] Discovery mode: issuer with static client ID`);
+                this.cache.config = await oauthClient.discoverConfiguration(
+                    providerConfig.discovery.issuer,
+                    providerConfig.client.clientId
+                );
+            } else {
+                // DCR mode - need existing registration
+                console.log(`[Fireflies] Discovery mode: issuer with DCR`);
+                const clientRepo = container.resolve<IClientRegistrationRepo>('clientRegistrationRepo');
+                const existingRegistration = await clientRepo.getClientRegistration(this.PROVIDER_NAME);
+                
+                if (!existingRegistration) {
+                    throw new Error('Fireflies client not registered. Please connect account first.');
+                }
+                
+                this.cache.config = await oauthClient.discoverConfiguration(
+                    providerConfig.discovery.issuer,
+                    existingRegistration.client_id
+                );
+            }
+        } else {
+            // Static endpoints
+            if (providerConfig.client.mode !== 'static') {
+                throw new Error('DCR requires discovery mode "issuer", not "static"');
+            }
+            
+            console.log(`[Fireflies] Using static endpoints (no discovery)`);
+            this.cache.config = oauthClient.createStaticConfiguration(
+                providerConfig.discovery.authorizationEndpoint,
+                providerConfig.discovery.tokenEndpoint,
+                providerConfig.client.clientId,
+                providerConfig.discovery.revocationEndpoint
+            );
+        }
+
+        console.log(`[Fireflies] OAuth configuration initialized`);
+    }
+
+    /**
+     * Create MCP client with OAuth authentication
+     */
+    private static async createMcpClient(tokens: OAuthTokens): Promise<Client> {
+        const url = new URL(FIREFLIES_MCP_URL);
+        
+        // Create transport with Authorization header
+        const requestInit: RequestInit = {
+            headers: {
+                'Authorization': `Bearer ${tokens.access_token}`,
+            },
+        };
+
+        const transport = new StreamableHTTPClientTransport(url, { requestInit });
+
+        const client = new Client({
+            name: 'rowboatx-fireflies',
+            version: '1.0.0',
+        });
+
+        await client.connect(transport);
+        console.log(`[Fireflies] MCP client connected`);
+        
+        return client;
+    }
+}
+
diff --git a/apps/x/packages/core/src/knowledge/sync_fireflies.ts b/apps/x/packages/core/src/knowledge/sync_fireflies.ts
new file mode 100644
index 00000000..71f49f06
--- /dev/null
+++ b/apps/x/packages/core/src/knowledge/sync_fireflies.ts
@@ -0,0 +1,487 @@
+import fs from 'fs';
+import path from 'path';
+import { WorkDir } from '../config/config.js';
+import { FirefliesClientFactory } from './fireflies-client-factory.js';
+import { buildGraph } from './build_graph.js';
+
+// Configuration
+const SYNC_DIR = path.join(WorkDir, 'fireflies_transcripts');
+const SYNC_INTERVAL_MS = 60 * 1000; // Check every minute
+const STATE_FILE = path.join(SYNC_DIR, 'sync_state.json');
+const LOOKBACK_DAYS = 30; // Last 1 month
+
+// --- Types for Fireflies API responses ---
+
+interface FirefliesMeeting {
+    id: string;
+    title?: string;
+    dateString?: string;
+    date?: string;
+    organizerEmail?: string;
+    organizer_email?: string;
+    participants?: string[];
+    meetingAttendees?: Array<{ displayName?: string | null; email: string }>;
+    meetingLink?: string;
+    duration?: number;
+    summary?: {
+        short_summary?: string;
+        keywords?: string[];
+        action_items?: string;
+    };
+}
+
+interface FirefliesTranscriptSentence {
+    text: string;
+    speaker_name?: string;
+    speakerName?: string;
+    start_time?: number;
+    startTime?: number;
+    end_time?: number;
+    endTime?: number;
+}
+
+interface FirefliesSummary {
+    keywords?: string[];
+    action_items?: string[] | string;
+    overview?: string;
+    short_summary?: string;
+    outline?: string[];
+    topics?: string[];
+}
+
+interface FirefliesMeetingData {
+    id: string;
+    title?: string;
+    dateString?: string;
+    date?: string;
+    organizerEmail?: string;
+    organizer_email?: string;
+    participants?: string[];
+    meetingAttendees?: Array<{ displayName?: string | null; email: string }>;
+    meetingLink?: string;
+    transcript?: {
+        sentences?: FirefliesTranscriptSentence[];
+    };
+    sentences?: FirefliesTranscriptSentence[];
+    summary?: FirefliesSummary;
+    duration?: number;
+}
+
+interface McpToolResult {
+    content?: Array<{
+        type: string;
+        text?: string;
+    }>;
+    isError?: boolean;
+}
+
+// --- Helper Functions ---
+
+function cleanFilename(name: string): string {
+    return name.replace(/[\\/*?:"<>|]/g, "_").substring(0, 100).trim();
+}
+
+function formatDuration(seconds?: number): string {
+    if (!seconds) return 'Unknown';
+    const mins = Math.floor(seconds / 60);
+    const secs = seconds % 60;
+    return `${mins}m ${secs}s`;
+}
+
+function formatTimestamp(seconds?: number): string {
+    if (seconds === undefined) return '';
+    const mins = Math.floor(seconds / 60);
+    const secs = Math.floor(seconds % 60);
+    return `[${mins.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}]`;
+}
+
+function loadState(): { lastSyncDate?: string; syncedIds?: string[] } {
+    if (fs.existsSync(STATE_FILE)) {
+        try {
+            return JSON.parse(fs.readFileSync(STATE_FILE, 'utf-8'));
+        } catch {
+            return {};
+        }
+    }
+    return {};
+}
+
+function saveState(lastSyncDate: string, syncedIds: string[]) {
+    fs.writeFileSync(STATE_FILE, JSON.stringify({
+        lastSyncDate,
+        syncedIds,
+        last_sync: new Date().toISOString()
+    }, null, 2));
+}
+
+/**
+ * Parse MCP tool result to extract JSON data
+ */
+function parseMcpResult<T>(result: McpToolResult): T | null {
+    if (result.isError) {
+        console.error('[Fireflies] MCP tool returned error');
+        return null;
+    }
+    
+    if (!result.content || result.content.length === 0) {
+        return null;
+    }
+    
+    // Find text content
+    const textContent = result.content.find(c => c.type === 'text' && c.text);
+    if (!textContent || !textContent.text) {
+        return null;
+    }
+    
+    try {
+        return JSON.parse(textContent.text) as T;
+    } catch {
+        // If not JSON, return the text as-is (for toon format)
+        console.log('[Fireflies] Response is not JSON, may be in toon format');
+        return null;
+    }
+}
+
+/**
+ * Parse toon format transcript text into sentences
+ * Format: "Sentences: Speaker Name: text.\nSpeaker Name: text.\n..."
+ */
+function parseToonTranscript(text: string): FirefliesTranscriptSentence[] {
+    const sentences: FirefliesTranscriptSentence[] = [];
+    
+    // Find the Sentences section
+    const sentencesMatch = text.match(/Sentences:\s*([\s\S]*)/);
+    if (!sentencesMatch) {
+        return sentences;
+    }
+    
+    const sentencesText = sentencesMatch[1];
+    
+    // Split by newlines and parse each line
+    // Format: "Speaker Name: sentence text"
+    const lines = sentencesText.split('\n').filter(line => line.trim());
+    
+    for (const line of lines) {
+        // Match "Speaker Name: text" pattern
+        const match = line.match(/^([^:]+):\s*(.+)$/);
+        if (match) {
+            sentences.push({
+                speakerName: match[1].trim(),
+                text: match[2].trim(),
+            });
+        }
+    }
+    
+    return sentences;
+}
+
+/**
+ * Get raw text from MCP result
+ */
+function getRawText(result: McpToolResult): string | null {
+    if (result.isError || !result.content || result.content.length === 0) {
+        return null;
+    }
+    
+    const textContent = result.content.find(c => c.type === 'text' && c.text);
+    return textContent?.text || null;
+}
+
+/**
+ * Convert meeting data to markdown format
+ */
+function meetingToMarkdown(meeting: FirefliesMeetingData): string {
+    let md = `# ${meeting.title || 'Untitled Meeting'}\n\n`;
+    
+    // Metadata
+    md += `**Meeting ID:** ${meeting.id}\n`;
+    
+    const dateStr = meeting.dateString || meeting.date;
+    if (dateStr) {
+        const date = new Date(dateStr);
+        md += `**Date:** ${date.toLocaleString()}\n`;
+    }
+    
+    const organizer = meeting.organizerEmail || meeting.organizer_email;
+    if (organizer) {
+        md += `**Organizer:** ${organizer}\n`;
+    }
+    
+    // Handle participants from either participants array or meetingAttendees
+    const participants = meeting.participants || 
+        meeting.meetingAttendees?.map(a => a.displayName || a.email) || [];
+    if (participants.length > 0) {
+        md += `**Participants:** ${participants.join(', ')}\n`;
+    }
+    
+    if (meeting.meetingLink) {
+        md += `**Meeting Link:** ${meeting.meetingLink}\n`;
+    }
+    
+    if (meeting.duration) {
+        md += `**Duration:** ${formatDuration(meeting.duration)}\n`;
+    }
+    
+    md += '\n---\n\n';
+    
+    // Summary section
+    if (meeting.summary) {
+        const summary = meeting.summary;
+        
+        // Handle short_summary or overview
+        const overview = summary.short_summary || summary.overview;
+        if (overview) {
+            md += `## Overview\n\n${overview}\n\n`;
+        }
+        
+        if (summary.keywords && summary.keywords.length > 0) {
+            md += `## Keywords\n\n${summary.keywords.join(', ')}\n\n`;
+        }
+        
+        if (summary.topics && summary.topics.length > 0) {
+            md += `## Topics Discussed\n\n`;
+            for (const topic of summary.topics) {
+                md += `- ${topic}\n`;
+            }
+            md += '\n';
+        }
+        
+        // Handle action_items as string or array
+        if (summary.action_items) {
+            md += `## Action Items\n\n`;
+            if (typeof summary.action_items === 'string') {
+                // It's a formatted string, include as-is
+                md += `${summary.action_items}\n\n`;
+            } else if (Array.isArray(summary.action_items) && summary.action_items.length > 0) {
+                for (const item of summary.action_items) {
+                    md += `- [ ] ${item}\n`;
+                }
+                md += '\n';
+            }
+        }
+        
+        if (summary.outline && summary.outline.length > 0) {
+            md += `## Outline\n\n`;
+            for (const point of summary.outline) {
+                md += `- ${point}\n`;
+            }
+            md += '\n';
+        }
+    }
+    
+    // Transcript section - handle both nested and flat sentence arrays
+    const sentences = meeting.transcript?.sentences || meeting.sentences;
+    if (sentences && sentences.length > 0) {
+        md += `## Transcript\n\n`;
+        
+        let currentSpeaker = '';
+        for (const sentence of sentences) {
+            const speaker = sentence.speaker_name || sentence.speakerName || 'Unknown';
+            const startTime = sentence.start_time ?? sentence.startTime;
+            const timestamp = formatTimestamp(startTime);
+            
+            if (speaker !== currentSpeaker) {
+                md += `\n### ${speaker}\n`;
+                currentSpeaker = speaker;
+            }
+            
+            md += `${timestamp} ${sentence.text}\n`;
+        }
+    }
+    
+    return md;
+}
+
+// --- Sync Logic ---
+
+async function syncMeetings() {
+    console.log('[Fireflies] Starting sync...');
+    
+    // Ensure sync directory exists
+    if (!fs.existsSync(SYNC_DIR)) {
+        fs.mkdirSync(SYNC_DIR, { recursive: true });
+    }
+    
+    const client = await FirefliesClientFactory.getClient();
+    if (!client) {
+        console.log('[Fireflies] No valid client available');
+        return;
+    }
+    
+    const state = loadState();
+    const syncedIds = new Set(state.syncedIds || []);
+    
+    // Calculate date range (last 30 days)
+    const toDate = new Date();
+    const fromDate = new Date();
+    fromDate.setDate(fromDate.getDate() - LOOKBACK_DAYS);
+    
+    const fromDateStr = fromDate.toISOString().split('T')[0]; // YYYY-MM-DD
+    const toDateStr = toDate.toISOString().split('T')[0];
+    
+    console.log(`[Fireflies] Fetching meetings from ${fromDateStr} to ${toDateStr}...`);
+    
+    try {
+        // Step 1: Get list of transcripts
+        const transcriptsResult = await client.callTool({
+            name: 'fireflies_get_transcripts',
+            arguments: {
+                fromDate: fromDateStr,
+                toDate: toDateStr,
+                limit: 50,
+                format: 'json',
+            },
+        }) as McpToolResult;
+        
+        // Parse result - API returns array directly, not { transcripts: [...] }
+        const parsedData = parseMcpResult<FirefliesMeeting[] | { transcripts?: FirefliesMeeting[] }>(transcriptsResult);
+        
+        // Handle both array and object responses
+        let meetings: FirefliesMeeting[];
+        if (Array.isArray(parsedData)) {
+            meetings = parsedData;
+        } else if (parsedData?.transcripts) {
+            meetings = parsedData.transcripts;
+        } else {
+            meetings = [];
+        }
+        
+        if (meetings.length === 0) {
+            console.log('[Fireflies] No transcripts found in date range');
+            saveState(toDateStr, Array.from(syncedIds));
+            return;
+        }
+        
+        console.log(`[Fireflies] Found ${meetings.length} transcripts`);
+        
+        // Step 2: Fetch and save each transcript
+        let newCount = 0;
+        for (const meeting of meetings) {
+            const meetingId = meeting.id;
+            
+            // Skip if already synced
+            if (syncedIds.has(meetingId)) {
+                console.log(`[Fireflies] Skipping already synced: ${meeting.title || meetingId}`);
+                continue;
+            }
+            
+            try {
+                console.log(`[Fireflies] Fetching full transcript: ${meeting.title || meetingId}`);
+                
+                // Try to get transcript sentences using fireflies_get_transcript
+                let sentences: FirefliesTranscriptSentence[] = [];
+                try {
+                    const transcriptResult = await client.callTool({
+                        name: 'fireflies_get_transcript',
+                        arguments: {
+                            transcriptId: meetingId,
+                        },
+                    }) as McpToolResult;
+                    
+                    // Try JSON first
+                    const transcriptData = parseMcpResult<{ sentences?: FirefliesTranscriptSentence[] } | FirefliesTranscriptSentence[]>(transcriptResult);
+                    
+                    if (transcriptData) {
+                        if (Array.isArray(transcriptData)) {
+                            sentences = transcriptData;
+                        } else if (transcriptData.sentences) {
+                            sentences = transcriptData.sentences;
+                        }
+                    } else {
+                        // Try parsing toon format
+                        const rawText = getRawText(transcriptResult);
+                        if (rawText) {
+                            sentences = parseToonTranscript(rawText);
+                            console.log(`[Fireflies] Parsed ${sentences.length} sentences from toon format`);
+                        }
+                    }
+                } catch (err) {
+                    console.log(`[Fireflies] Could not fetch transcript sentences: ${err}`);
+                }
+                
+                // Build meeting data from the list response + transcript
+                const meetingData: FirefliesMeetingData = {
+                    id: meeting.id,
+                    title: meeting.title,
+                    dateString: meeting.dateString,
+                    organizerEmail: meeting.organizerEmail,
+                    participants: meeting.participants,
+                    meetingAttendees: meeting.meetingAttendees,
+                    meetingLink: meeting.meetingLink,
+                    duration: meeting.duration,
+                    summary: meeting.summary,
+                    sentences: sentences,
+                };
+                
+                // Convert to markdown and save
+                const markdown = meetingToMarkdown(meetingData);
+                const filename = `${meetingId}_${cleanFilename(meetingData.title || 'untitled')}.md`;
+                const filePath = path.join(SYNC_DIR, filename);
+                
+                fs.writeFileSync(filePath, markdown);
+                console.log(`[Fireflies] Saved: ${filename}`);
+                
+                syncedIds.add(meetingId);
+                newCount++;
+            } catch (error) {
+                console.error(`[Fireflies] Error fetching meeting ${meetingId}:`, error);
+                // Continue with next meeting
+            }
+        }
+        
+        console.log(`[Fireflies] Synced ${newCount} new transcripts`);
+        
+        // Save state
+        saveState(toDateStr, Array.from(syncedIds));
+        
+        // Build knowledge graph after successful sync
+        if (newCount > 0) {
+            console.log('\n[Fireflies] Starting knowledge graph build...');
+            try {
+                await buildGraph();
+            } catch (error) {
+                console.error('[Fireflies] Error building knowledge graph:', error);
+            }
+        }
+        
+    } catch (error) {
+        console.error('[Fireflies] Error during sync:', error);
+        
+        // Check if it's an auth error
+        const errorMessage = error instanceof Error ? error.message : String(error);
+        if (errorMessage.includes('401') || errorMessage.includes('Unauthorized')) {
+            console.log('[Fireflies] Auth error, clearing cache');
+            await FirefliesClientFactory.clearCache();
+        }
+    }
+}
+
+/**
+ * Main sync loop
+ */
+export async function init() {
+    console.log('[Fireflies] Starting Fireflies Sync...');
+    console.log(`[Fireflies] Will check for credentials every ${SYNC_INTERVAL_MS / 1000} seconds.`);
+    console.log(`[Fireflies] Syncing transcripts from the last ${LOOKBACK_DAYS} days.`);
+
+    while (true) {
+        try {
+            // Check if credentials are available
+            const hasCredentials = await FirefliesClientFactory.hasValidCredentials();
+            
+            if (!hasCredentials) {
+                console.log('[Fireflies] OAuth credentials not available. Sleeping...');
+            } else {
+                // Perform sync
+                await syncMeetings();
+            }
+        } catch (error) {
+            console.error('[Fireflies] Error in main loop:', error);
+        }
+
+        // Sleep before next check
+        console.log(`[Fireflies] Sleeping for ${SYNC_INTERVAL_MS / 1000} seconds...`);
+        await new Promise(resolve => setTimeout(resolve, SYNC_INTERVAL_MS));
+    }
+}
+