API Specification

Source Code: src/gaia/api/

The GAIA API Server implements a subset of OpenAI’s Chat Completions API with GAIA agents exposed as “models”.

Base URL: http://localhost:8080 (default) Architecture:

External Client → FastAPI Server → GAIA Agents → Lemonade LLM Backend

Endpoints

Health Check

GET /health

Check server health status

Response:

{
  "status": "ok",
  "service": "gaia-api"
}

Example:

curl http://localhost:8080/health

List Models

GET /v1/models

List available GAIA agent models

Response Schema:

{
  "object": "list",
  "data": [
    {
      "id": "string",
      "object": "model",
      "created": 1234567890,
      "owned_by": "amd-gaia",
      "description": "string",
      "max_input_tokens": 32768,
      "max_output_tokens": 8192
    }
  ]
}

Example:

curl http://localhost:8080/v1/models

Chat Completions

POST /v1/chat/completions

Create chat completion using a GAIA agent

Supports both streaming (SSE) and non-streaming responses.

Request Parameters

Parameter	Type	Required	Default	Range	Description
`model`	string	✅ Yes	-	-	Model ID (e.g., “gaia-code”)
`messages`	array	✅ Yes	-	-	Array of message objects
`stream`	boolean	No	`false`	-	Enable Server-Sent Events streaming
`temperature`	number	No	`0.7`	0.0 - 2.0	Sampling temperature
`max_tokens`	integer	No	-	> 0	Maximum tokens to generate
`top_p`	number	No	`1.0`	0.0 - 1.0	Nucleus sampling parameter

Message Object

Field	Type	Required	Values	Description
`role`	string	✅ Yes	`"system"`, `"user"`, `"assistant"`, `"tool"`	Message role
`content`	string	✅ Yes	-	Message content
`tool_calls`	array	No	-	Tool calls (assistant role only)
`tool_call_id`	string	No	-	Tool call ID (tool role only)

Non-Streaming Response

Request
Response

curl -X POST http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gaia-code",
    "messages": [{"role": "user", "content": "Write a hello function"}],
    "stream": false
  }'

{
  "id": "chatcmpl-abc123",
  "object": "chat.completion",
  "created": 1677652288,
  "model": "gaia-code",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Here's a hello function..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 20,
    "completion_tokens": 150,
    "total_tokens": 170
  }
}

Streaming Response

Request
Response (SSE)

curl -X POST http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gaia-code",
    "messages": [{"role": "user", "content": "Write a hello function"}],
    "stream": true
  }'

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1677652288,"model":"gaia-code","choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null}]}

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1677652288,"model":"gaia-code","choices":[{"index":0,"delta":{"content":"Here"},"finish_reason":null}]}

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1677652288,"model":"gaia-code","choices":[{"index":0,"delta":{"content":"'s"},"finish_reason":null}]}

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1677652288,"model":"gaia-code","choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}

data: [DONE]

Available Models

gaia-code

Autonomous Code Development

Python/TypeScript development agent with intelligent routing

Property	Value
ID	`gaia-code`
Max Input Tokens	32768
Max Output Tokens	8192
Description	Autonomous Python/TypeScript coding agent with planning, generation, and testing

Requirements:

Lemonade Server with --ctx-size 32768
Model: Qwen3.5-35B-A3B-GGUF

Capabilities:

Code generation (functions, classes, projects)
Test generation
Linting & formatting (pylint, Black)
Error detection and correction
Project scaffolding
Architectural planning

Error Responses

All errors follow OpenAI’s error format.

400 - Bad Request

{
  "error": {
    "message": "messages is required",
    "type": "invalid_request_error",
    "code": "invalid_request"
  }
}

404 - Model Not Found

{
  "error": {
    "message": "Model 'gaia-invalid' not found. Available models: gaia-code",
    "type": "invalid_request_error",
    "code": "model_not_found"
  }
}

500 - Internal Server Error

{
  "error": {
    "message": "Agent processing failed: <details>",
    "type": "internal_error",
    "code": "agent_error"
  }
}

OpenAI API Compatibility

Supported Features

✅ Supported

/v1/chat/completions (streaming & non-streaming)
/v1/models
messages array with roles
temperature, max_tokens, top_p
Server-Sent Events (SSE) streaming

❌ Not Supported

frequency_penalty, presence_penalty
functions and tools parameters
response_format parameter
logprobs, n, stop parameters
/v1/embeddings, /v1/audio/*, /v1/images/*

Adding New Agents

Create Agent Class

# src/gaia/agents/myagent/agent.py
from gaia.agents.base.api_agent import ApiAgent
from gaia.agents.base.agent import Agent

class MyAgent(ApiAgent, Agent):
    def get_model_info(self):
        return {
            "max_input_tokens": 8192,
            "max_output_tokens": 4096,
        }

# src/gaia/api/agent_registry.py
AGENT_MODELS = {
    "gaia-myagent": {
        "class_name": "gaia.agents.myagent.agent.MyAgent",
        "init_params": {"silent_mode": True},
        "description": "My custom agent"
    }
}

Restart Server

gaia api stop
gaia api start

Security

Designed for local development only. Not production-ready.

Current Implementation:

❌ No authentication
❌ No rate limiting
✅ CORS enabled (all origins)

For Production Deployment:

Implement API key authentication
Add rate limiting middleware
Configure CORS restrictions
Use HTTPS with valid certificates

API Server Guide

Usage examples and integration guides

Code Agent

Code agent capabilities

Routing Guide

Intelligent language detection

VSCode Integration

VSCode extension setup

Command Line

API & Development

Help

API Specification

Endpoints

Health Check

GET /health

List Models

GET /v1/models

Chat Completions

POST /v1/chat/completions

Request Parameters

Message Object

Non-Streaming Response

Streaming Response

Available Models

gaia-code

Autonomous Code Development

Error Responses

400 - Bad Request

404 - Model Not Found

500 - Internal Server Error

OpenAI API Compatibility

Supported Features

✅ Supported

❌ Not Supported

Adding New Agents

Security

See Also

API Server Guide

Code Agent

Routing Guide

VSCode Integration

​Endpoints

​Health Check

GET /health

​List Models

GET /v1/models

​Chat Completions

POST /v1/chat/completions

​Request Parameters

​Message Object

​Non-Streaming Response

​Streaming Response

​Available Models

​gaia-code

Autonomous Code Development

​Error Responses

​400 - Bad Request

​404 - Model Not Found

​500 - Internal Server Error

​OpenAI API Compatibility

​Supported Features

✅ Supported

❌ Not Supported

​Adding New Agents

​Security

​See Also

API Server Guide

Code Agent

Routing Guide

VSCode Integration

Endpoints

Health Check

List Models

Chat Completions

Request Parameters

Message Object

Non-Streaming Response

Streaming Response

Available Models

gaia-code

Error Responses

400 - Bad Request

404 - Model Not Found

500 - Internal Server Error

OpenAI API Compatibility

Supported Features

Adding New Agents

Security

See Also