django-agentic 0.6.1

AI framework for Django — LangGraph + LangChain. Entity-aware agents, credit management, usage logging, prompt caching, HITL.

django-agentic

AI framework for Django: entity-aware chatbot agents with tools, human-in-the-loop approval, credit management, usage logging, and audio transcription. Built on LangGraph + LangChain.

Supports multiple AI providers (Anthropic, OpenAI, and any custom provider) through an extensible registry. All calls — LLM, transcription, or custom — go through the same credit-check and usage-logging pipeline.

pip install django-agentic[anthropic]

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What you get out of the box

• Agent chatbot — a chat API that knows which Django model the user is viewing, can call tools to read or write data, and asks for confirmation before making changes
• REST API — namespaced endpoints under agentic/ (credits, agent chat, history)
• Human-in-the-Loop (HITL) — write tools pause for user approval via HumanInTheLoopMiddleware; read tools execute immediately
• Prompt caching — automatic via AnthropicPromptCachingMiddleware (up to 90% cost reduction on repeated requests)
• Provider registry — OpenAI and Anthropic built-in; add Google, Bedrock, or any provider with register_provider() in your AppConfig.ready()
• Audio transcription — ai_service.transcribe() handles chunking, Whisper API, duration-based cost tracking, and credit deduction
• Credit system — free monthly credits + purchased credits per user, with automatic model tier selection (paid model when credits allow, free model as fallback)
• Usage logging — every AI call logged with token counts, cost, cache metrics, and credit deductions. Non-token models (Whisper) use duration-based cost
• Structured invocation — ai_service.invoke() for workflow nodes that need structured Pydantic output (extraction, classification, generation)
• Configurable checkpointer — InMemorySaver by default, swap to PostgresSaver or RedisSaver for production persistence
• Django admin — all models registered with Chart.js usage dashboards

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Architecture

django_agentic/
  providers.py   — Provider registry (register_provider, create_chat_model, create_transcription_client)
  service.py     — AIService facade (invoke, chat, resume, transcribe, log_usage)
  chat.py        — Agent chat/resume (LangGraph agents, HITL, conversation history)
  credits.py     — Credit system (resolve_model_for_user, deduct_credits)
  context.py     — Context vars (current_ai_user, current_ai_model_name)
  agent.py       — Agent base class + registry (ModelAgent, AgentRegistry)
  models.py      — Django models (AIModel, AIUsageLog, SiteAIConfig, UserAIProfile)
  views.py       — REST API endpoints
  admin.py       — Django admin with usage charts

Data flow:

Browser -> POST /api/agentic/agent/chat
            |
       agent_chat view (DRF)
            |
       AIService.chat()  <-> resolve_model_for_user (credit check)
            |
       AgentRegistry  ->  YourCustomAgent (extends ModelAgent)
            |
       providers.create_chat_model()  ->  registered factory (Anthropic / OpenAI / custom)
            |
       create_agent()  <-> HumanInTheLoopMiddleware + AnthropicPromptCachingMiddleware
            |
       LLM call  ->  _record_usage()  ->  deduct_credits()  ->  AIUsageLog

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Quick start

1. Install

pip install django-agentic[anthropic]  # or django-agentic[openai]

2. Configure

# settings.py
INSTALLED_APPS = [
    ...
    "rest_framework",
    "django.contrib.contenttypes",
    "django_agentic",
]

DJANGO_AGENTIC = {
    "DEFAULT_MODEL": "claude-sonnet-4-20250514",
    "ANTHROPIC_API_KEY": "sk-ant-...",
    "OPENAI_API_KEY": "sk-...",  # needed for Whisper transcription
}

3. Add URLs

# urls.py
urlpatterns = [
    path("api/", include("django_agentic.urls")),
]

4. Migrate

python manage.py migrate

This creates the tables and seeds default AI models with current pricing. Go to Django admin > AI Configuration to pick your free-tier and paid-tier defaults.

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Creating an agent

Subclass ModelAgent and implement three methods. django_agentic handles everything else: provider selection, prompt caching, chat history, usage logging, credits, and HITL.

# myapp/agents.py
from django_agentic.agent import ModelAgent

class ProductAgent(ModelAgent):

    def get_static_instructions(self) -> str:
        """Cacheable system prompt. Cached by Anthropic for 5 min."""
        return "You are a product assistant. Use tools to read and update data."

    def get_dynamic_context(self) -> str:
        """Ephemeral context — entity state, rebuilt per request."""
        p = self.entity
        return f"Product: {p.name} (ID: {p.pk})\nPrice: {p.price}"

    def get_tools(self) -> list:
        return [get_product_details, update_price]

    def get_tools_requiring_approval(self) -> list[str]:
        return ["update_price"]

Register in settings:

DJANGO_AGENTIC = {
    "AGENT_MAPPINGS": {
        "catalog.Product": "catalog.agents.ProductAgent",
    },
}

---

Provider registry

Built-in providers (anthropic, openai) are registered at import time. Add custom providers in your AppConfig.ready():

# myapp/apps.py
from django.apps import AppConfig

class MyAppConfig(AppConfig):
    def ready(self):
        from django_agentic.providers import register_provider

        def google_factory(model_name, api_key, **kwargs):
            from langchain_google_genai import ChatGoogleGenerativeAI
            return ChatGoogleGenerativeAI(model=model_name, api_key=api_key, **kwargs)

        register_provider("google", google_factory)

Then create an AIModel record in admin with provider="google" and it just works.

---

Audio transcription

ai_service.transcribe() handles the full Whisper pipeline: chunking files >25MB, calling the OpenAI API, calculating cost from audio duration ($0.006/min), deducting credits, and logging usage — all through the same pipeline as LLM calls.

from django_agentic.service import ai_service

transcript = ai_service.transcribe(
    file_path="/tmp/interview.m4a",
    workflow="my_workflow",
    node="transcribe",
    file_name="interview.m4a",
    user=request.user,
)

Custom transcription providers (e.g. Deepgram) can be registered:

from django_agentic.providers import register_transcription_provider

register_transcription_provider("deepgram", my_deepgram_factory)

---

Structured invocation (workflows)

For LangGraph workflow nodes that need structured Pydantic output:

from django_agentic.service import ai_service
from pydantic import BaseModel, Field

class ProductAnalysis(BaseModel):
    category: str = Field(description="Product category")
    sentiment: float = Field(description="Sentiment score 0-1")

result = ai_service.invoke(
    schema=ProductAnalysis,
    system_prompt="Analyze this product review.",
    human_content="Great product, fast shipping!",
    workflow="reviews",
    node="analyze",
)

Every invoke() call is automatically logged, costed, and credit-deducted.

---

Running workflows (ai_context)

When running a LangGraph workflow that calls ai_service.invoke() internally:

from django_agentic.service import ai_context

with ai_context(user) as ctx:
    # ctx.model_name, ctx.model, ctx.is_free_tier available
    my_workflow.invoke({"input": data})
# context vars auto-reset on exit, even if an exception occurs

---

API endpoints

Method	Path	Description
GET	agentic/credits/	Credit status, current model, available models
PATCH	agentic/credits/model-override/	Set per-user model override
GET	agentic/credits/usage/	Usage statistics (daily, by model, by workflow)
POST	agentic/agent/chat	Send a chat message
POST	agentic/agent/resume	Approve/reject HITL interrupt
GET	agentic/agent/history	Load conversation history for an entity

---

Credit system

Each user gets a configurable free monthly credit allowance (default $2.00). When free credits run out, the system falls back to the free-tier model. Users with purchased credits get the paid-tier model.

• Admins see unlimited credits (staff bypass)
• Per-user model override in admin
• Atomic credit deduction with idempotency keys (no double-charging on retries)
• Non-token models (Whisper) use explicit_cost_usd for duration-based billing

python manage.py reset_free_credits  # run monthly via cron

---

Checkpointer (chat history storage)

Default: InMemorySaver (works out of the box, loses history on server restart).

PostgreSQL (production)

from langgraph.checkpoint.postgres import PostgresSaver
DJANGO_AGENTIC = {
    "CHECKPOINTER": PostgresSaver.from_conn_string("postgresql://user:pass@host/db"),
}

Redis

from langgraph.checkpoint.redis import RedisSaver
DJANGO_AGENTIC = {"CHECKPOINTER": RedisSaver(redis_url="redis://localhost:6379")}

---

Configuration reference

Key	Default	Description
DEFAULT_MODEL	claude-sonnet-4-20250514	Fallback LLM model name
ANTHROPIC_API_KEY	""	Anthropic API key
OPENAI_API_KEY	""	OpenAI API key (also used for Whisper)
MAX_RETRIES	8	LLM retry count
REQUESTS_PER_SECOND	0.8	Rate limiter for LLM calls
CHECKPOINTER	InMemorySaver()	LangGraph checkpointer instance
AGENT_MAPPINGS	{}	Maps "app.Model" to "app.agents.AgentClass"
ENTITY_MODELS	[]	Model paths for entity resolution by ID

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Requirements

• Python 3.11+
• Django 4.2+
• Django REST Framework 3.14+
• LangChain 0.3+
• LangGraph 1.0+

Optional:

• langchain-anthropic — Anthropic models + prompt caching
• langchain-openai — OpenAI models
• openai — Whisper transcription
• langgraph-checkpoint-postgres — PostgreSQL checkpointer
• langgraph-checkpoint-redis — Redis checkpointer

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License

MIT