fleet-memory/hindsight-api

Hindsight API

Memory System for AI Agents — Temporal + Semantic + Entity Memory Architecture using PostgreSQL with pgvector.

Hindsight gives AI agents persistent memory that works like human memory: it stores facts, tracks entities and relationships, handles temporal reasoning ("what happened last spring?"), and forms opinions based on configurable disposition traits.

Installation

pip install hindsight-api

Quick Start

Run the Server

# Set your LLM provider
export HINDSIGHT_API_LLM_PROVIDER=openai
export HINDSIGHT_API_LLM_API_KEY=sk-xxxxxxxxxxxx

# Start the server (uses embedded PostgreSQL by default)
hindsight-api

The server starts at http://localhost:8888 with:

• REST API for memory operations
• MCP server at /mcp for tool-use integration

Use the Python API

from hindsight_api import MemoryEngine

# Create and initialize the memory engine
memory = MemoryEngine()
await memory.initialize()

# Create a memory bank for your agent
bank = await memory.create_memory_bank(
    name="my-assistant",
    background="A helpful coding assistant"
)

# Store a memory
await memory.retain(
    memory_bank_id=bank.id,
    content="The user prefers Python for data science projects"
)

# Recall memories
results = await memory.recall(
    memory_bank_id=bank.id,
    query="What programming language does the user prefer?"
)

# Reflect with reasoning
response = await memory.reflect(
    memory_bank_id=bank.id,
    query="Should I recommend Python or R for this ML project?"
)

CLI Options

hindsight-api --help

# Common options
hindsight-api --port 9000          # Custom port (default: 8888)
hindsight-api --host 127.0.0.1     # Bind to localhost only
hindsight-api --workers 4          # Multiple worker processes
hindsight-api --log-level debug    # Verbose logging

Configuration

Configure via environment variables:

Variable	Description	Default
HINDSIGHT_API_DATABASE_URL	PostgreSQL connection string	pg0 (embedded)
HINDSIGHT_API_LLM_PROVIDER	openai, groq, gemini, ollama	openai
HINDSIGHT_API_LLM_API_KEY	API key for LLM provider	-
HINDSIGHT_API_LLM_MODEL	Model name	gpt-4o-mini
HINDSIGHT_API_HOST	Server bind address	0.0.0.0
HINDSIGHT_API_PORT	Server port	8888

Example with External PostgreSQL

export HINDSIGHT_API_DATABASE_URL=postgresql://user:pass@localhost:5432/hindsight
export HINDSIGHT_API_LLM_PROVIDER=groq
export HINDSIGHT_API_LLM_API_KEY=gsk_xxxxxxxxxxxx

hindsight-api

Docker

docker run --rm -it -p 8888:8888 \
  -e HINDSIGHT_API_LLM_API_KEY=$OPENAI_API_KEY \
  -v $HOME/.hindsight-docker:/home/hindsight/.pg0 \
  ghcr.io/vectorize-io/hindsight:latest

MCP Server

For local MCP integration without running the full API server:

hindsight-local-mcp

This runs a stdio-based MCP server that can be used directly with MCP-compatible clients.

Key Features

• Multi-Strategy Retrieval (TEMPR) — Semantic, keyword, graph, and temporal search combined with RRF fusion
• Entity Graph — Automatic entity extraction and relationship tracking
• Temporal Reasoning — Native support for time-based queries
• Disposition Traits — Configurable skepticism, literalism, and empathy influence opinion formation
• Three Memory Types — World facts, bank actions, and formed opinions with confidence scores

Documentation

Full documentation: https://hindsight.vectorize.io

• Installation Guide
• Configuration Reference
• API Reference
• Python SDK

License

Apache 2.0