aegra-api 0.2.0

Aegra core API - Self-hosted Agent Protocol server

aegra-api

Aegra API - Self-hosted Agent Protocol server.

Aegra is an open-source, self-hosted alternative to LangGraph Platform. This package provides the core API server that implements the Agent Protocol, allowing you to run AI agents on your own infrastructure without vendor lock-in.

Features

• Agent Protocol Compliant: Works with Agent Chat UI, LangGraph Studio, CopilotKit
• Drop-in Replacement: Compatible with the LangGraph SDK
• Self-Hosted: Run on your own PostgreSQL database
• Streaming Support: Real-time streaming of agent responses
• Human-in-the-Loop: Built-in support for human approval workflows
• Vector Store: Semantic search capabilities with PostgreSQL

Installation

pip install aegra-api

Quick Start

The easiest way to get started is with the aegra-cli:

# Install the CLI
pip install aegra-cli

# Initialize a new project
aegra init --docker

# Start services
aegra up

# Apply migrations
aegra db upgrade

# Start development server
aegra dev

Manual Setup

If you prefer manual setup:

# Install dependencies
pip install aegra-api

# Set environment variables
export POSTGRES_USER=aegra
export POSTGRES_PASSWORD=aegra_secret
export POSTGRES_HOST=localhost
export POSTGRES_DB=aegra

# Run migrations
alembic upgrade head

# Start server
uvicorn aegra_api.main:app --reload

Configuration

aegra.json

Define your agent graphs in aegra.json:

{
  "graphs": {
    "agent": "./graphs/my_agent/graph.py:graph",
    "assistant": "./graphs/assistant/graph.py:graph"
  },
  "http": {
    "app": "./custom_routes.py:app"
  }
}

Environment Variables

# Database
POSTGRES_USER=aegra
POSTGRES_PASSWORD=aegra_secret
POSTGRES_HOST=localhost
POSTGRES_DB=aegra

# Authentication
AUTH_TYPE=noop  # Options: noop, custom

# Server
HOST=0.0.0.0
PORT=8000

# Configuration
AEGRA_CONFIG=aegra.json

# LLM (for example agents)
OPENAI_API_KEY=sk-...

# Observability (optional)
OTEL_TARGETS=LANGFUSE,PHOENIX

API Endpoints

Endpoint	Method	Description
/assistants	POST	Create assistant from graph_id
/assistants	GET	List user's assistants
/assistants/{id}	GET	Get assistant details
/threads	POST	Create conversation thread
/threads/{id}/state	GET	Get thread state
/threads/{id}/runs	POST	Execute graph (streaming/background)
/runs/{id}/stream	POST	Stream run events
/store	PUT	Save to vector store
/store/search	POST	Semantic search
/health	GET	Health check

Creating Graphs

Agents are Python modules exporting a compiled graph variable:

# graphs/my_agent/graph.py
from typing import TypedDict
from langgraph.graph import StateGraph, START, END

class State(TypedDict):
    messages: list[str]

def process_node(state: State) -> State:
    messages = state.get("messages", [])
    messages.append("Processed!")
    return {"messages": messages}

# Build the graph
builder = StateGraph(State)
builder.add_node("process", process_node)
builder.add_edge(START, "process")
builder.add_edge("process", END)

# Export as 'graph'
graph = builder.compile()

Architecture

+---------------------------------------------------------+
|  FastAPI HTTP Layer (Agent Protocol API)                |
|  - /assistants, /threads, /runs, /store endpoints       |
+---------------------------------------------------------+
|  Middleware Stack                                        |
|  - Auth, CORS, Structured Logging, Correlation ID       |
+---------------------------------------------------------+
|  Service Layer (Business Logic)                          |
|  - LangGraphService, AssistantService, StreamingService |
+---------------------------------------------------------+
|  LangGraph Runtime                                       |
|  - Graph execution, state management, tool execution    |
+---------------------------------------------------------+
|  Database Layer (PostgreSQL)                             |
|  - AsyncPostgresSaver (checkpoints), AsyncPostgresStore |
+---------------------------------------------------------+

Package Structure

libs/aegra-api/
├── src/aegra_api/
│   ├── api/              # Agent Protocol endpoints
│   │   ├── assistants.py # /assistants CRUD
│   │   ├── threads.py    # /threads and state management
│   │   ├── runs.py       # /runs execution and streaming
│   │   └── store.py      # /store vector storage
│   ├── services/         # Business logic layer
│   ├── core/             # Infrastructure (database, auth, orm)
│   ├── models/           # Pydantic request/response schemas
│   ├── middleware/       # ASGI middleware
│   ├── observability/    # OpenTelemetry tracing
│   ├── utils/            # Helper functions
│   ├── main.py           # FastAPI app entry point
│   ├── config.py         # HTTP/store config loading
│   └── settings.py       # Environment settings
├── tests/                # Test suite
├── alembic/              # Database migrations
└── pyproject.toml

Related Packages

• aegra-cli: Command-line interface for project management
• aegra: Meta-package that installs both aegra-api and aegra-cli

Documentation

For full documentation, see the CLAUDE.md file in the repository root.