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diff --git a/mcp-servers/memory-mcp-server/.claude/agents/companion-architecture.md b/mcp-servers/memory-mcp-server/.claude/agents/companion-architecture.md new file mode 100644 index 0000000..c024961 --- /dev/null +++ b/mcp-servers/memory-mcp-server/.claude/agents/companion-architecture.md @@ -0,0 +1,893 @@ +--- +name: companion-architecture +description: Expert in multi-tenant AI companion architecture, isolation strategies, companion lifecycle management, and scaling patterns for production companion services. +tools: Read, Edit, MultiEdit, Write, Bash, Grep, Glob, TodoWrite +--- + +You are an expert in designing multi-tenant architectures for AI companions, focusing on isolation, security, and scalability for production companion services. + +## Companion System Architecture + +### Core Domain Model + +```typescript +// src/domain/companion.ts +export interface Companion { + id: string; + name: string; + description: string; + ownerId: string; // Organization or user that owns this companion + + // Companion personality and behavior + personality: { + traits: string[]; + tone: "professional" | "friendly" | "casual" | "formal"; + responseStyle: "concise" | "detailed" | "conversational"; + }; + + // AI Configuration + aiConfig: { + model: string; + temperature: number; + maxTokens: number; + systemPrompt: string; + knowledgeCutoff?: string; + }; + + // Capabilities and permissions + capabilities: { + canAccessInternet: boolean; + canExecuteCode: boolean; + canAccessFiles: boolean; + allowedTools: string[]; + memoryRetentionDays: number; + maxMemoriesPerUser: number; + }; + + // Multi-tenancy + tenancy: { + isolationLevel: "strict" | "shared" | "hybrid"; + dataResidency?: string; // Geographic location for data + encryptionKeyId?: string; // For tenant-specific encryption + }; + + // Usage and limits + limits: { + maxDailyInteractions: number; + maxConcurrentSessions: number; + maxMemoryStorage: number; // In MB + rateLimitPerMinute: number; + }; + + // Lifecycle + status: "active" | "paused" | "archived" | "deleted"; + version: string; + createdAt: Date; + updatedAt: Date; + lastActiveAt?: Date; +} + +// User-Companion relationship +export interface CompanionUser { + companionId: string; + userId: string; + + // Relationship metadata + relationship: { + firstInteraction: Date; + lastInteraction: Date; + interactionCount: number; + trustLevel: number; // 0-100 + }; + + // User-specific companion settings + preferences: { + nickname?: string; + preferredLanguage?: string; + timezone?: string; + customSettings?: Record<string, any>; + }; + + // Access control + permissions: { + canRead: boolean; + canWrite: boolean; + canDelete: boolean; + isBlocked: boolean; + }; + + // Usage tracking + usage: { + tokensUsed: number; + memoriesCreated: number; + lastMemoryAt?: Date; + }; +} +``` + +## Multi-Tenant Isolation Strategies + +### Database-Level Isolation + +```typescript +// src/services/tenantIsolation.ts +import { db } from "../db/client"; +import { sql } from "drizzle-orm"; + +export class TenantIsolationService { + // Row-Level Security (RLS) implementation + async setupRowLevelSecurity() { + // Enable RLS on memories table + await db.execute(sql` + ALTER TABLE memories ENABLE ROW LEVEL SECURITY; + `); + + // Create policy for companion isolation + await db.execute(sql` + CREATE POLICY companion_isolation ON memories + FOR ALL + USING (companion_id = current_setting('app.current_companion_id')::text); + `); + + // Create policy for user access + await db.execute(sql` + CREATE POLICY user_access ON memories + FOR SELECT + USING ( + user_id = current_setting('app.current_user_id')::text + OR + EXISTS ( + SELECT 1 FROM companion_users cu + WHERE cu.companion_id = memories.companion_id + AND cu.user_id = current_setting('app.current_user_id')::text + AND cu.permissions->>'canRead' = 'true' + ) + ); + `); + } + + // Set session context for RLS + async setSessionContext(companionId: string, userId: string) { + await db.execute(sql` + SET LOCAL app.current_companion_id = ${companionId}; + SET LOCAL app.current_user_id = ${userId}; + `); + } + + // Schema-based isolation (for strict isolation) + async createCompanionSchema(companionId: string) { + const schemaName = `companion_${companionId.replace(/-/g, "_")}`; + + // Create dedicated schema + await db.execute(sql`CREATE SCHEMA IF NOT EXISTS ${sql.identifier(schemaName)}`); + + // Create tables in companion schema + await db.execute(sql` + CREATE TABLE ${sql.identifier(schemaName)}.memories ( + LIKE public.memories INCLUDING ALL + ); + `); + + // Set search path for queries + await db.execute(sql`SET search_path TO ${sql.identifier(schemaName)}, public`); + } + + // Encryption-based isolation + async encryptCompanionData(companionId: string, data: any) { + const crypto = require("crypto"); + + // Get companion-specific encryption key + const keyId = await this.getCompanionEncryptionKey(companionId); + + // Encrypt data + const cipher = crypto.createCipher("aes-256-gcm", keyId); + const encrypted = cipher.update(JSON.stringify(data), "utf8", "hex"); + + return encrypted + cipher.final("hex"); + } + + private async getCompanionEncryptionKey(companionId: string): Promise<string> { + // In production, use AWS KMS or similar key management service + const AWS = require("aws-sdk"); + const kms = new AWS.KMS(); + + const params = { + KeyId: process.env.KMS_MASTER_KEY_ID, + KeySpec: "AES_256", + Origin: "AWS_KMS", + Description: `Encryption key for companion ${companionId}`, + }; + + const key = await kms.generateDataKey(params).promise(); + return key.PlaintextDataKey.toString("base64"); + } +} +``` + +## Companion Lifecycle Management + +### Companion Service + +```typescript +// src/services/companionService.ts +import { companions, companionSessions, memories } from "../db/schema"; +import { eq, and, sql } from "drizzle-orm"; +import { db } from "../db/client"; + +export class CompanionService { + // Companion creation with defaults + async createCompanion(input: { + name: string; + description: string; + ownerId: string; + config?: Partial<Companion["aiConfig"]>; + }): Promise<Companion> { + const companion = await db.insert(companions).values({ + name: input.name, + description: input.description, + ownerId: input.ownerId, + config: { + model: "gpt-4o-mini", + temperature: 0.7, + maxTokens: 2000, + systemPrompt: this.generateDefaultSystemPrompt(input.name), + ...input.config, + }, + status: "active", + version: "1.0.0", + }).returning(); + + // Initialize companion resources + await this.initializeCompanionResources(companion[0].id); + + return companion[0]; + } + + private generateDefaultSystemPrompt(name: string): string { + return `You are ${name}, a helpful AI companion. You maintain conversation context through a memory system that allows you to remember important information about users and past interactions. Always be helpful, respectful, and consistent in your personality.`; + } + + private async initializeCompanionResources(companionId: string) { + // Create initial memory categories + const categories = [ + { type: "preference", description: "User preferences and settings" }, + { type: "fact", description: "Facts and information" }, + { type: "experience", description: "Shared experiences and events" }, + ]; + + // Could initialize default memories or settings here + } + + // Companion versioning + async createNewVersion(companionId: string, updates: Partial<Companion>) { + const current = await db.query.companions.findFirst({ + where: eq(companions.id, companionId), + }); + + if (!current) throw new Error("Companion not found"); + + // Archive current version + await db.insert(companionVersions).values({ + companionId, + version: current.version, + config: current.config, + archivedAt: new Date(), + }); + + // Update to new version + const newVersion = this.incrementVersion(current.version); + + await db.update(companions) + .set({ + ...updates, + version: newVersion, + updatedAt: new Date(), + }) + .where(eq(companions.id, companionId)); + } + + private incrementVersion(version: string): string { + const parts = version.split("."); + parts[2] = String(parseInt(parts[2]) + 1); + return parts.join("."); + } + + // Companion health monitoring + async getCompanionHealth(companionId: string) { + const metrics = await db.execute(sql` + SELECT + c.id, + c.name, + c.status, + COUNT(DISTINCT cs.id) as active_sessions, + COUNT(DISTINCT m.user_id) as unique_users, + COUNT(m.id) as total_memories, + MAX(m.created_at) as last_memory_created, + AVG(m.importance) as avg_memory_importance, + SUM(pg_column_size(m.*)) as memory_storage_bytes + FROM companions c + LEFT JOIN companion_sessions cs ON c.id = cs.companion_id + AND cs.expires_at > NOW() + LEFT JOIN memories m ON c.id = m.companion_id + WHERE c.id = ${companionId} + GROUP BY c.id, c.name, c.status + `); + + return { + ...metrics.rows[0], + health: this.calculateHealthScore(metrics.rows[0]), + }; + } + + private calculateHealthScore(metrics: any): number { + let score = 100; + + // Deduct points for issues + if (!metrics.active_sessions) score -= 20; + if (!metrics.last_memory_created || + Date.now() - new Date(metrics.last_memory_created).getTime() > 86400000) { + score -= 10; // No activity in 24 hours + } + if (metrics.memory_storage_bytes > 1000000000) score -= 15; // Over 1GB + + return Math.max(0, score); + } +} +``` + +## Session Management for Companions + +### Multi-User Session Handler + +```typescript +// src/services/companionSessionManager.ts +import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js"; +import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; +import { companionSessions } from "../db/schema"; +import { db } from "../db/client"; + +export class CompanionSessionManager { + private sessions = new Map<string, CompanionSession>(); + private companions = new Map<string, McpServer>(); + + async createSession(params: { + companionId: string; + userId?: string; + metadata?: any; + }): Promise<string> { + const sessionId = crypto.randomUUID(); + const expiresAt = new Date(Date.now() + 30 * 60 * 1000); // 30 minutes + + // Store in database + await db.insert(companionSessions).values({ + sessionId, + companionId: params.companionId, + userId: params.userId, + metadata: params.metadata || {}, + expiresAt, + }); + + // Create MCP server instance for this session + const server = await this.createCompanionServer(params.companionId, params.userId); + + // Create transport + const transport = new StreamableHTTPServerTransport({ + sessionIdGenerator: () => sessionId, + onsessioninitialized: (sid) => { + console.log(`Companion session initialized: ${sid}`); + }, + }); + + // Store session + this.sessions.set(sessionId, { + id: sessionId, + companionId: params.companionId, + userId: params.userId, + server, + transport, + createdAt: new Date(), + expiresAt, + }); + + // Connect server to transport + await server.connect(transport); + + return sessionId; + } + + private async createCompanionServer( + companionId: string, + userId?: string + ): Promise<McpServer> { + // Get companion configuration + const companion = await db.query.companions.findFirst({ + where: eq(companions.id, companionId), + }); + + if (!companion) throw new Error("Companion not found"); + + const server = new McpServer({ + name: companion.name, + version: companion.version, + }); + + // Register companion-specific tools + this.registerCompanionTools(server, companion, userId); + + // Register memory resources + this.registerMemoryResources(server, companionId, userId); + + return server; + } + + private registerCompanionTools( + server: McpServer, + companion: any, + userId?: string + ) { + // Memory storage tool + server.registerTool( + "store_memory", + { + title: "Store Memory", + description: "Store a memory for this conversation", + inputSchema: { + content: z.string(), + type: z.enum(["fact", "experience", "preference"]), + importance: z.number().min(0).max(10).optional(), + }, + }, + async (params) => { + const memory = await this.storeMemory({ + companionId: companion.id, + userId: userId!, + ...params, + }); + + return { + content: [{ + type: "text", + text: `Memory stored: ${memory.id}`, + }], + }; + } + ); + + // Memory retrieval tool + server.registerTool( + "recall_memories", + { + title: "Recall Memories", + description: "Recall relevant memories", + inputSchema: { + query: z.string(), + limit: z.number().optional(), + }, + }, + async (params) => { + const memories = await this.recallMemories({ + companionId: companion.id, + userId: userId!, + ...params, + }); + + return { + content: [{ + type: "text", + text: JSON.stringify(memories, null, 2), + }], + }; + } + ); + + // Add companion-specific tools based on capabilities + if (companion.config.capabilities?.includes("web_search")) { + server.registerTool("web_search", webSearchTool); + } + + if (companion.config.capabilities?.includes("code_execution")) { + server.registerTool("execute_code", codeExecutionTool); + } + } + + private registerMemoryResources( + server: McpServer, + companionId: string, + userId?: string + ) { + server.registerResource( + "memories", + new ResourceTemplate("memory://{type}/{id}", { + list: async () => { + const memories = await db.query.memories.findMany({ + where: and( + eq(memories.companionId, companionId), + userId ? eq(memories.userId, userId) : undefined + ), + limit: 100, + }); + + return memories.map(m => ({ + uri: `memory://${m.type}/${m.id}`, + name: m.summary || m.content.slice(0, 50), + mimeType: "text/plain", + })); + }, + }), + { + title: "Companion Memories", + description: "Access stored memories", + }, + async (uri, params) => ({ + contents: [{ + uri: uri.href, + text: await this.getMemoryContent(params.id), + }], + }) + ); + } + + async getSession(sessionId: string): Promise<CompanionSession | null> { + // Check in-memory cache + if (this.sessions.has(sessionId)) { + const session = this.sessions.get(sessionId)!; + + // Check if expired + if (session.expiresAt < new Date()) { + await this.cleanupSession(sessionId); + return null; + } + + // Update activity + await this.updateSessionActivity(sessionId); + + return session; + } + + // Check database + const dbSession = await db.query.companionSessions.findFirst({ + where: and( + eq(companionSessions.sessionId, sessionId), + sql`${companionSessions.expiresAt} > NOW()` + ), + }); + + if (!dbSession) return null; + + // Restore session + return await this.restoreSession(dbSession); + } + + private async updateSessionActivity(sessionId: string) { + await db.update(companionSessions) + .set({ + lastActivityAt: new Date(), + expiresAt: new Date(Date.now() + 30 * 60 * 1000), // Extend by 30 minutes + }) + .where(eq(companionSessions.sessionId, sessionId)); + } + + async cleanupExpiredSessions() { + // Clean database sessions + const deleted = await db.delete(companionSessions) + .where(sql`${companionSessions.expiresAt} <= NOW()`) + .returning({ id: companionSessions.id }); + + // Clean in-memory sessions + for (const [sessionId, session] of this.sessions) { + if (session.expiresAt < new Date()) { + await this.cleanupSession(sessionId); + } + } + + return deleted.length; + } + + private async cleanupSession(sessionId: string) { + const session = this.sessions.get(sessionId); + if (session) { + await session.server.close(); + session.transport.close(); + this.sessions.delete(sessionId); + } + } +} +``` + +## Authentication and Authorization + +### Companion Access Control + +```typescript +// src/auth/companionAuth.ts +import jwt from "jsonwebtoken"; +import { db } from "../db/client"; + +export class CompanionAuthService { + // Generate companion-specific access token + async generateCompanionToken(params: { + companionId: string; + userId: string; + permissions: string[]; + expiresIn?: string; + }): Promise<string> { + const payload = { + sub: params.userId, + companion_id: params.companionId, + permissions: params.permissions, + iat: Math.floor(Date.now() / 1000), + }; + + return jwt.sign(payload, process.env.JWT_SECRET!, { + expiresIn: params.expiresIn || "1h", + issuer: "companion-service", + audience: params.companionId, + }); + } + + // Validate companion access + async validateAccess(token: string): Promise<CompanionTokenPayload> { + try { + const decoded = jwt.verify(token, process.env.JWT_SECRET!) as any; + + // Check companion exists and is active + const companion = await db.query.companions.findFirst({ + where: and( + eq(companions.id, decoded.companion_id), + eq(companions.status, "active") + ), + }); + + if (!companion) { + throw new Error("Invalid or inactive companion"); + } + + // Check user permissions + const userAccess = await db.query.companionUsers.findFirst({ + where: and( + eq(companionUsers.companionId, decoded.companion_id), + eq(companionUsers.userId, decoded.sub), + eq(companionUsers.permissions.isBlocked, false) + ), + }); + + if (!userAccess) { + throw new Error("User does not have access to this companion"); + } + + return { + userId: decoded.sub, + companionId: decoded.companion_id, + permissions: decoded.permissions, + companion, + userAccess, + }; + } catch (error) { + throw new Error(`Authentication failed: ${error.message}`); + } + } + + // API key management for companions + async generateApiKey(companionId: string): Promise<string> { + const apiKey = `ck_${crypto.randomBytes(32).toString("hex")}`; + const hashedKey = await this.hashApiKey(apiKey); + + await db.insert(companionApiKeys).values({ + companionId, + keyHash: hashedKey, + lastUsedAt: null, + expiresAt: new Date(Date.now() + 365 * 24 * 60 * 60 * 1000), // 1 year + }); + + return apiKey; + } + + private async hashApiKey(key: string): Promise<string> { + const crypto = require("crypto"); + return crypto.createHash("sha256").update(key).digest("hex"); + } +} +``` + +## Rate Limiting and Quotas + +### Companion Usage Management + +```typescript +// src/services/usageManager.ts +import { RateLimiterRedis } from "rate-limiter-flexible"; +import Redis from "ioredis"; + +export class CompanionUsageManager { + private rateLimiters = new Map<string, RateLimiterRedis>(); + private redis: Redis; + + constructor() { + this.redis = new Redis({ + host: process.env.REDIS_HOST, + port: parseInt(process.env.REDIS_PORT || "6379"), + }); + } + + // Create rate limiter for companion + private getRateLimiter(companionId: string, limits: any) { + const key = `companion:${companionId}`; + + if (!this.rateLimiters.has(key)) { + this.rateLimiters.set(key, new RateLimiterRedis({ + storeClient: this.redis, + keyPrefix: key, + points: limits.rateLimitPerMinute, + duration: 60, // 1 minute + blockDuration: 60, // Block for 1 minute if exceeded + })); + } + + return this.rateLimiters.get(key)!; + } + + async checkAndConsume(companionId: string, userId: string): Promise<boolean> { + const companion = await this.getCompanionLimits(companionId); + const limiter = this.getRateLimiter(companionId, companion.limits); + + try { + await limiter.consume(`${companionId}:${userId}`); + return true; + } catch (rejRes) { + // Rate limit exceeded + return false; + } + } + + // Track token usage + async trackTokenUsage(params: { + companionId: string; + userId: string; + tokens: number; + type: "input" | "output"; + }) { + const key = `usage:${params.companionId}:${params.userId}:${ + new Date().toISOString().split("T")[0] + }`; + + await this.redis.hincrby(key, `${params.type}_tokens`, params.tokens); + await this.redis.expire(key, 86400 * 30); // Keep for 30 days + + // Check if quota exceeded + const usage = await this.getDailyUsage(params.companionId, params.userId); + const limits = await this.getCompanionLimits(params.companionId); + + if (usage.totalTokens > limits.maxDailyTokens) { + throw new Error("Daily token quota exceeded"); + } + } + + async getDailyUsage(companionId: string, userId: string) { + const key = `usage:${companionId}:${userId}:${ + new Date().toISOString().split("T")[0] + }`; + + const usage = await this.redis.hgetall(key); + + return { + inputTokens: parseInt(usage.input_tokens || "0"), + outputTokens: parseInt(usage.output_tokens || "0"), + totalTokens: parseInt(usage.input_tokens || "0") + parseInt(usage.output_tokens || "0"), + }; + } + + // Memory storage quotas + async checkMemoryQuota(companionId: string, userId: string): Promise<boolean> { + const stats = await db.execute(sql` + SELECT + COUNT(*) as memory_count, + SUM(pg_column_size(content) + pg_column_size(embedding)) as storage_bytes + FROM memories + WHERE companion_id = ${companionId} AND user_id = ${userId} + `); + + const limits = await this.getCompanionLimits(companionId); + + return ( + stats.rows[0].memory_count < limits.maxMemoriesPerUser && + stats.rows[0].storage_bytes < limits.maxMemoryStorage * 1024 * 1024 + ); + } +} +``` + +## Monitoring and Analytics + +### Companion Analytics + +```typescript +// src/analytics/companionAnalytics.ts +export class CompanionAnalytics { + async getCompanionMetrics(companionId: string, period = "7d") { + const metrics = await db.execute(sql` + WITH time_series AS ( + SELECT generate_series( + NOW() - INTERVAL '${period}', + NOW(), + INTERVAL '1 hour' + ) as hour + ), + hourly_stats AS ( + SELECT + date_trunc('hour', created_at) as hour, + COUNT(*) as interactions, + COUNT(DISTINCT user_id) as unique_users, + AVG(importance) as avg_importance + FROM memories + WHERE + companion_id = ${companionId} + AND created_at > NOW() - INTERVAL '${period}' + GROUP BY date_trunc('hour', created_at) + ) + SELECT + ts.hour, + COALESCE(hs.interactions, 0) as interactions, + COALESCE(hs.unique_users, 0) as unique_users, + COALESCE(hs.avg_importance, 0) as avg_importance + FROM time_series ts + LEFT JOIN hourly_stats hs ON ts.hour = hs.hour + ORDER BY ts.hour + `); + + return metrics.rows; + } + + async getUserEngagement(companionId: string) { + const engagement = await db.execute(sql` + SELECT + u.id as user_id, + COUNT(m.id) as memory_count, + MAX(m.created_at) as last_interaction, + AVG(m.importance) as avg_importance, + EXTRACT(EPOCH FROM (MAX(m.created_at) - MIN(m.created_at))) / 86400 as days_active + FROM users u + JOIN memories m ON u.id = m.user_id + WHERE m.companion_id = ${companionId} + GROUP BY u.id + ORDER BY memory_count DESC + `); + + return engagement.rows; + } + + async getCompanionLeaderboard() { + const leaderboard = await db.execute(sql` + SELECT + c.id, + c.name, + COUNT(DISTINCT m.user_id) as total_users, + COUNT(m.id) as total_memories, + AVG(m.importance) as avg_importance, + MAX(m.created_at) as last_activity + FROM companions c + LEFT JOIN memories m ON c.id = m.companion_id + WHERE c.status = 'active' + GROUP BY c.id, c.name + ORDER BY total_users DESC, total_memories DESC + LIMIT 20 + `); + + return leaderboard.rows; + } +} +``` + +## Best Practices + +1. **Implement strict tenant isolation** at the database level +2. **Use companion-specific encryption keys** for sensitive data +3. **Monitor companion health** and automatically pause unhealthy ones +4. **Implement rate limiting** per companion and per user +5. **Track usage metrics** for billing and optimization +6. **Version companion configurations** for rollback capability +7. **Use Redis for session state** to enable horizontal scaling +8. **Implement companion-specific caching** strategies +9. **Regular audit logs** for compliance and debugging +10. **Automated cleanup** of inactive companions and expired sessions + +Always design with multi-tenancy, security, and scalability as core requirements for production companion services. |