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Interface: IStorageAdapter

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:217

Core storage adapter interface for AgentOS persistence.

Implementations of this interface provide the actual storage mechanism (SQL database, NoSQL, in-memory, etc.) while AgentOS remains storage-agnostic.

Design Principles:

  • All methods are async for non-blocking I/O
  • Returns null when entities don't exist (not throwing errors)
  • Uses strong typing for compile-time safety
  • Supports transaction-like batch operations
  • Designed for multi-user scenarios (userId scoping)

Lifecycle:

  1. Instantiate adapter with configuration
  2. Call initialize() to set up database/schema
  3. Use CRUD operations during runtime
  4. Call close() when shutting down (optional cleanup)

IStorageAdapter

Example​

// Example implementation instantiation
const storage: IStorageAdapter = new SqlStorageAdapter({
  type: 'better-sqlite3',
  database: './agentos.db'
});

await storage.initialize();

// Create conversation
const conversation = await storage.createConversation({
  id: 'conv-123',
  userId: 'user-456',
  createdAt: Date.now(),
  lastActivity: Date.now()
});

// Store message
await storage.storeMessage({
  id: 'msg-001',
  conversationId: 'conv-123',
  role: 'user',
  content: 'Hello!',
  timestamp: Date.now()
});

// Query messages
const messages = await storage.getMessages('conv-123', { limit: 10 });

Methods​

close()​

close(): Promise<void>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:260

Closes the storage adapter and releases resources.

This should:

  • Close database connections
  • Flush any pending writes
  • Clean up temporary resources

Call during application shutdown for graceful cleanup.

Returns​

Promise<void>

Resolves when cleanup is complete

Example​

process.on('SIGTERM', async () => {
  await storage.close();
  process.exit(0);
});

createConversation()​

createConversation(conversation): Promise<IConversation>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:283

Creates a new conversation record.

Parameters​

conversation​

IConversation

The conversation object to create

Returns​

Promise<IConversation>

The created conversation (may include defaults)

Throws​

If conversation with same ID already exists or validation fails

Example​

const conversation = await storage.createConversation({
  id: uuidv4(),
  userId: 'user-123',
  agentId: 'agent-coding',
  createdAt: Date.now(),
  lastActivity: Date.now(),
  title: 'New coding project'
});

deleteConversation()​

deleteConversation(conversationId): Promise<boolean>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:339

Deletes a conversation and all its messages.

Warning: This is a destructive operation that cannot be undone. Consider implementing soft deletes in production.

Parameters​

conversationId​

string

The conversation to delete

Returns​

Promise<boolean>

True if deleted, false if not found

Example​

const deleted = await storage.deleteConversation('conv-123');
if (deleted) {
  console.log('Conversation deleted successfully');
}

deleteMessage()​

deleteMessage(messageId): Promise<boolean>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:453

Deletes a specific message.

Note: This does NOT update the conversation's lastActivity timestamp.

Parameters​

messageId​

string

The message to delete

Returns​

Promise<boolean>

True if deleted, false if not found

Example​

const deleted = await storage.deleteMessage('msg-456');

deleteMessagesForConversation()​

deleteMessagesForConversation(conversationId): Promise<number>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:469

Deletes all messages in a conversation.

Warning: Destructive operation. Consider soft deletes in production.

Parameters​

conversationId​

string

The conversation whose messages to delete

Returns​

Promise<number>

Number of messages deleted

Example​

const deletedCount = await storage.deleteMessagesForConversation('conv-123');
console.log(`Deleted ${deletedCount} messages`);

getConversation()​

getConversation(conversationId): Promise<IConversation | null>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:299

Retrieves a conversation by its ID.

Parameters​

conversationId​

string

The unique conversation identifier

Returns​

Promise<IConversation | null>

The conversation or null if not found

Example​

const conv = await storage.getConversation('conv-123');
if (conv) {
  console.log('Found:', conv.title);
}

getConversationTokenUsage()​

getConversationTokenUsage(conversationId): Promise<ITokenUsage>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:504

Calculates total token usage for a conversation.

Sums up all message usage statistics.

Parameters​

conversationId​

string

The conversation to analyze

Returns​

Promise<ITokenUsage>

Aggregated token usage

Example​

const usage = await storage.getConversationTokenUsage('conv-123');
console.log(`Total tokens: ${usage.totalTokens}`);
console.log(`Cost estimate: $${usage.totalTokens * 0.00001}`);

getMessage()​

getMessage(messageId): Promise<IConversationMessage | null>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:409

Retrieves a single message by its ID.

Parameters​

messageId​

string

The unique message identifier

Returns​

Promise<IConversationMessage | null>

The message or null if not found

Example​

const msg = await storage.getMessage('msg-456');
if (msg) {
  console.log(`[${msg.role}]: ${msg.content}`);
}

getMessageCount()​

getMessageCount(conversationId): Promise<number>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:487

Counts total messages in a conversation.

Useful for pagination and UI indicators.

Parameters​

conversationId​

string

The conversation to count

Returns​

Promise<number>

Total message count

Example​

const count = await storage.getMessageCount('conv-123');
console.log(`This conversation has ${count} messages`);

getMessages()​

getMessages(conversationId, options?): Promise<IConversationMessage[]>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:438

Retrieves all messages for a conversation with optional filtering.

This is the primary method for loading conversation history.

Parameters​

conversationId​

string

The conversation to query

options?​

IMessageQueryOptions

Query options for filtering/pagination

Returns​

Promise<IConversationMessage[]>

Array of messages matching criteria

Example​

// Get all messages (oldest first)
const allMessages = await storage.getMessages('conv-123');

// Get last 50 messages (newest first)
const recent = await storage.getMessages('conv-123', {
  limit: 50,
  order: 'desc'
});

// Get only assistant responses from last hour
const assistantRecent = await storage.getMessages('conv-123', {
  roles: ['assistant'],
  since: Date.now() - 3600000
});

initialize()​

initialize(): Promise<void>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:238

Initializes the storage adapter.

This should:

  • Establish database connections
  • Create necessary tables/schemas if they don't exist
  • Run migrations if needed
  • Validate configuration

Must be called before any other methods.

Returns​

Promise<void>

Resolves when initialization is complete

Throws​

If initialization fails (connection errors, invalid config, etc.)

Example​

const storage = new SqlStorageAdapter(config);
await storage.initialize(); // Sets up database schema

listConversations()​

listConversations(userId, options?): Promise<IConversation[]>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:366

Lists all conversations for a specific user.

Results are typically ordered by lastActivity (most recent first).

Parameters​

userId​

string

The user whose conversations to retrieve

options?​

Optional filtering/pagination

agentId?​

string

Filter by specific agent

limit?​

number

Maximum conversations to return

offset?​

number

Number of conversations to skip

Returns​

Promise<IConversation[]>

Array of conversations

Example​

// Get user's 20 most recent conversations
const conversations = await storage.listConversations('user-123', {
  limit: 20
});

// Get conversations for specific agent
const codingConvs = await storage.listConversations('user-123', {
  agentId: 'agent-coding'
});

storeMessage()​

storeMessage(message): Promise<IConversationMessage>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:393

Stores a new message in a conversation.

Note: This also updates the parent conversation's lastActivity timestamp.

Parameters​

message​

IConversationMessage

The message to store

Returns​

Promise<IConversationMessage>

The stored message

Throws​

If conversation doesn't exist or validation fails

Example​

await storage.storeMessage({
  id: uuidv4(),
  conversationId: 'conv-123',
  role: 'user',
  content: 'Explain async/await',
  timestamp: Date.now()
});

updateConversation()​

updateConversation(conversationId, updates): Promise<IConversation>

Defined in: packages/agentos/src/core/storage/IStorageAdapter.ts:320

Updates an existing conversation's metadata.

Only provided fields will be updated. Omitted fields remain unchanged.

Parameters​

conversationId​

string

The conversation to update

updates​

Partial<IConversation>

Fields to update

Returns​

Promise<IConversation>

The updated conversation

Throws​

If conversation doesn't exist

Example​

// Update title and last activity
const updated = await storage.updateConversation('conv-123', {
  title: 'Renamed conversation',
  lastActivity: Date.now()
});