🔧 Highly Extensible

Unlimited
customization

Extend every aspect of Cogency. Build custom tools, override reasoning steps, create specialized agents—all with the same zero-config simplicity.

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Custom Tools in Minutes

Create powerful tools with just a few lines of code

tools/database_tool.py 
 from cogency.tools.base import BaseTool import sqlite3 class DatabaseTool(BaseTool): def __init__(self): super().__init__( name="database_query", description="Execute SQL queries on the database" ) async def run(self, query: str): # Your database logic here conn = sqlite3.connect("app.db") result = conn.execute(query).fetchall() return "data": result # That's it! Auto-discovered and ready to use

Instantly available! Drop this file in your tools/ directory and your agent can now query databases naturally.

What You Can Extend

Custom Tools

  • • API integrations
  • • Database connections
  • • File operations
  • • External services
  • • Domain-specific logic

Reasoning Nodes

  • • Custom plan strategies
  • • Specialized reasoning
  • • Domain-specific actions
  • • Custom reflection logic
  • • Response formatting

LLM Providers

  • • Custom model APIs
  • • Local model hosting
  • • Specialized prompting
  • • Custom streaming
  • • Model routing

Advanced: Custom Reasoning Node

Override the reasoning process for specialized behavior

nodes/domain_reasoning.py 
 from cogency.nodes.reason import reason from cogency.types import AgentState async def medical_reasoning(state: AgentState): """Custom reasoning for medical diagnosis agents.""" # Add medical-specific reasoning patterns medical_context = """ Consider differential diagnosis: 1. Most common conditions first
					2. Rule out serious conditions 3. Consider patient history and
					symptoms """ # Enhance the reasoning with domain knowledge enhanced_state = state.copy() enhanced_state["medical_context"] = medical_context # Call the standard reasoning with enhancements return await reason(enhanced_state) # Register your custom node agent.workflow.add_node("reason", medical_reasoning)

Growing Plugin Ecosystem

🌐

Web Tools

Scraping, APIs, automation

📊

Data Tools

Analysis, visualization, ML

🏢

Enterprise

CRM, ERP, workflows

🤖

AI Tools

Vision, audio, specialized models

Extensibility Meets Simplicity

Zero Configuration

Extensions work with zero additional setup.

Auto-Discovery

Custom tools are automatically discovered and loaded.

Production Ready

Extensions scale seamlessly to production workloads.

Ready to Extend Cogency?

Build custom tools and extend every aspect of Cogency's architecture

Start Extending View on GitHub