@amaster.ai/pi-memory-mem0

Passive semantic memory extension powered by Mem0 — supports both Platform (cloud) and Open-Source (local) modes.

How It Works

After each conversation turn, user + assistant messages are automatically sent to Mem0 for fact extraction and vector storage. Before the next turn, relevant memories are recalled via semantic search and injected into the system prompt.

Zero effort required — memory storage and recall are fully automatic.

Two Modes

Mode	Vector Store	Persistence	Dependencies	Use Case
platform	Mem0 Cloud	Cloud-managed	MEM0_API_KEY	Quick start, multi-device sync
open-source	Mem0 OSS vector store	Vector-store managed	LLM + Embedding API	Data privacy, no Mem0 Cloud

Architecture (Open-Source Mode)

User ←→ Agent ←→ Mem0 OSS Memory
                        ↕
            Mem0 OSS Vector Store (source of truth)

• Vector search: mem0ai OSS MemoryVectorStore. Despite the provider name memory, it is backed by SQLite; dbPath selects an in-process SQLite database or a SQLite file.
• LLM extraction: Configured provider extracts facts from conversations
• Persistence: The default dbPath is <home>/memories/mem0-vectors.db, so Mem0 writes vectors and payloads directly to a durable SQLite file. No second snapshot is maintained.
• Provider mapping: Custom providers are automatically mapped to mem0-compatible providers (e.g. openai) via the pi model registry's api field.
• Observation date: add() accepts an optional observedAt (Date or string). In OSS mode it grounds mem0's extraction prompt so relative time references ("yesterday", "last week") resolve against the conversation's date rather than the system clock — important when ingesting historical conversations. Omit it and mem0 falls back to the current date (correct for live turns).

Quick Start

Platform Mode

{
  "pi-memory-mem0": {
    "mode": "platform",
    "apiKey": "${MEM0_API_KEY}",
    "userId": "${USER}"
  }
}

Open-Source Mode (Recommended)

Reuses API keys and base URLs from pi's configured model providers — no extra environment variables needed.

{
  "pi-memory-mem0": {
    "mode": "open-source",
    "userId": "${USER}"
  }
}

Defaults to OpenAI text-embedding-3-small (embedding) + gpt-4.1-nano (extraction). API keys and base URLs are automatically resolved from pi's model registry.

Custom Provider

When your model registry defines a custom provider with api: "openai-completions", you can use it directly:

{
  "pi-memory-mem0": {
    "mode": "open-source",
    "oss": {
      "llm": {
        "provider": "my-provider",
        "config": { "model": "deepseek-v4-pro" }
      },
      "embedder": {
        "provider": "my-provider",
        "config": { "model": "text-embedding-v4" }
      }
    }
  }
}

The extension automatically:

1. Resolves API key from the model registry
2. Injects baseUrl from the registry
3. Maps api: "openai-completions" → mem0 provider "openai"

Fully Local (Ollama)

{
  "pi-memory-mem0": {
    "mode": "open-source",
    "userId": "${USER}",
    "oss": {
      "llm": {
        "provider": "ollama",
        "config": { "model": "llama3", "url": "http://localhost:11434" }
      },
      "embedder": {
        "provider": "ollama",
        "config": { "model": "nomic-embed-text", "url": "http://localhost:11434" }
      }
    },
    "useRegistryKeys": false
  }
}

External Vector Store (e.g. Qdrant)

For production workloads that need a dedicated vector database:

{
  "pi-memory-mem0": {
    "mode": "open-source",
    "oss": {
      "vectorStore": {
        "provider": "qdrant",
        "config": { "url": "http://localhost:6333" }
      }
    }
  }
}

Supported vector store providers: memory (default), qdrant, redis, pgvector, supabase.

The configured vector store always owns persistence. To request an intentionally ephemeral SQLite database, set the memory provider's config.dbPath to ":memory:"; no snapshot fallback is created.

Configuration Reference

Field	Type	Default	Description
mode	"platform" | "open-source"	"platform"	Operating mode
apiKey	string	—	Required for platform mode. Supports ${MEM0_API_KEY}
baseUrl	string	https://api.mem0.ai	Custom platform endpoint
userId	string	$USER or "default-user"	Memory scoping identifier
topK	number	5	Max recalled memories per turn
useRegistryKeys	boolean	true	Whether OSS mode resolves keys from pi registry
oss.llm	object	OpenAI gpt-4.1-nano	OSS extraction model
oss.embedder	object	OpenAI text-embedding-3-small	OSS embedding model
oss.vectorStore	object	memory at <home>/memories/mem0-vectors.db	Custom vector store config
oss.historyStore	object	SQLite at <home>/memories/mem0-history.db	Custom mem0 history store config
oss.historyDbPath	string	<home>/memories/mem0-history.db	Shortcut for SQLite history DB path
oss.disableHistory	boolean	false	Disable mem0 operation history

Data Storage

Mode	Vector Data	History
Platform	Mem0 Cloud	Cloud-managed
Open-Source (default)	<home>/memories/mem0-vectors.db	<home>/memories/mem0-history.db
Open-Source (memory, dbPath: ":memory:")	Process-local SQLite; lost on restart	<home>/memories/mem0-history.db
Open-Source (Qdrant)	Qdrant server	<home>/memories/mem0-history.db

The home directory is resolved via resolveHome() from @amaster.ai/pi-shared/settings (defaults to ~/.pi/agent).

Provider Mapping

When a provider name doesn't match mem0's built-in list, the extension uses the model registry's api field to map it:

Registry api field	Mapped to mem0 provider
openai-completions, openai-responses	openai
anthropic-messages	anthropic
azure-*	azure_openai
google-*, gemini-*	gemini

This happens transparently — just configure the provider name as it appears in your models.json.

Installation Notes

The default Open-Source mode depends on better-sqlite3 (native addon, transitive dependency of mem0ai) for both the vector store and history. This remains true for dbPath: ":memory:": it changes where SQLite stores pages, not which vector-store implementation is used.

For pi-agent users: pi-agent's package.json includes better-sqlite3 in pnpm.onlyBuiltDependencies — it compiles automatically during pnpm install. No extra steps needed.

For standalone users: If your project's pnpm config blocks build scripts, add to your root package.json:

{
  "pnpm": {
    "onlyBuiltDependencies": ["better-sqlite3"]
  }
}

If better-sqlite3 fails to load (for example, because of a Node ABI mismatch), the default memory vector store cannot start. An external vector store can still be used with history disabled or configured to a working provider.

Tools

Tool	Description
mem0_search	Semantic search over long-term memories
mem0_profile	List all stored memories
mem0_save	Store a fact verbatim (bypasses LLM extraction)

Commands

/mem0 status          # Show current status
/mem0 search <query>  # Semantic search
/mem0 profile         # List all memories

Relationship with pi-memory

pi-memory-mem0 and pi-memory run independently in parallel as separate extensions:

• pi-memory: Active memory — agent explicitly manages via tools, local .md files, hard char limits
• pi-memory-mem0: Passive memory — automatic extraction and storage, semantic retrieval, no capacity limits

They do not interfere with each other and each injects into the system prompt separately.

Dedup API

The package exports a standalone deduplication function used by pi-memory's dreaming job:

import { dedupMemories } from "@amaster.ai/pi-memory-mem0/dedup";

const result = await dedupMemories({
  userId: "my-user",
  config: { mode: "platform", apiKey: "..." },
});
// result: { total: 42, duplicatesRemoved: 3 }

Normalizes entries (case-insensitive, whitespace-collapsed), identifies exact duplicates, and deletes the older ones through the configured provider. In OSS mode those deletes go directly to the vector store.