Q&A: Custom Agent Development & Plugin System — Extending CactusRalph-Coder

[AGI-Corporation]

Custom Agent Development & Plugin System Deep-Dive Q&A

This thread covers building custom agents, extending core functionality, and developing plugins for CactusRalph-Coder — the architecture patterns, extension points, and how to contribute new agent types.

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Common Questions

Agent architecture & extension points

• What is the base agent class/interface I need to implement to create a custom agent?
• What lifecycle hooks are available (on_start, on_step, on_complete, on_error)?
• How do I register a new agent type with the agent dispatcher/router?
• What is the minimum required interface for a custom agent to work with the planner?

Building a custom tool

• How do I define a new tool that an agent can call (function schema, input/output types)?
• How are tools validated and sandboxed before execution?
• Can tools be async? How do I handle long-running external tool calls?
• How do I add a tool that requires credentials (GitHub token, AWS key, etc.)?

Plugin system

• Is there an official plugin/extension system or marketplace?
• How do I package a custom agent as a distributable plugin?
• How do plugins interact with the core memory and state systems?
• Can plugins override or wrap built-in agent behavior?

Domain-specific agents

• How do I build a domain-specific agent (e.g., a Python-only coder, a documentation writer, a test generator)?
• How do I constrain an agent to only operate on certain file types or directories?
• Can I build an agent that specializes in a specific framework (Django, FastAPI, React)?

Testing & debugging custom agents

• How do I unit test a custom agent without making real LLM calls?
• Is there a mock LLM mode for development?
• How do I trace a custom agent's execution step-by-step?
• What logging hooks are available for custom agents?

Contributing upstream

• What is the process for contributing a new agent type to the main repo?
• Are there code style or interface requirements for contributed agents?
• How do I write tests for a contributed agent that the CI pipeline will run?

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Share your custom agent builds, plugin experiments, and extension patterns below.