ReActAgent.from_tools() not working in LlamaIndex 0.13.x+

[teetangh]

[Discussion] What am I missing? ReActAgent.from_tools() not working in LlamaIndex 0.13.x+

Hi LlamaIndex community! 👋

I'm trying to upgrade from LlamaIndex 0.12.x to 0.13.6+ but running into issues with ReActAgent.from_tools(). I'm sure I'm missing something obvious, but could use some guidance.

What I'm trying to do

I have existing code that works perfectly in LlamaIndex 0.12.x:

from llama_index.core.agent import ReActAgent
from llama_index.core.tools import FunctionTool

# This worked in 0.12.x
agent = ReActAgent.from_tools(
    tools=tools,
    llm=Settings.llm,
    verbose=True,
    system_prompt=system_prompt,
    max_iterations=6,
)

What's happening

When I upgrade to 0.13.6+, I get:

AttributeError: type object 'ReActAgent' has no attribute 'from_tools'

Environment

• LlamaIndex Version: 0.13.6+
• Python Version: 3.12
• Operating System: macOS
• Framework: LlamaIndex with Couchbase vector store

What I think I know

From reading the docs, I see there's a new workflow-based approach for ReAct agents introduced around 0.10.43. The workflow examples look great for complex use cases!

But I'm confused because:

1. My simple use case worked fine in 0.12.x
2. I can't find clear migration docs for the from_tools() pattern
3. The workflow approach seems like overkill for basic ReAct agents

My questions

1. Was ReActAgent.from_tools() intentionally removed in 0.13.x? Or am I importing from the wrong place?

2. Is there a simple equivalent for the old from_tools() pattern that doesn't require building a full workflow?

3. Is there migration documentation I missed that shows how to convert from the old API to the new one?

4. Should I stick with 0.12.x for now? Or is there an easy upgrade path I'm not seeing?

What I've tried

• Checked the documentation (found workflow examples but no migration guide)
• Looked at the API reference (ReActAgent exists but no from_tools method)
• Searched GitHub issues (found workflow discussions but no clear migration path)

Context

This is affecting integration packages like agentc-llamaindex that require llama-index ^0.13.4 but still use the classic API pattern. So I'm probably not the only one running into this.

Any guidance would be much appreciated! I'm sure there's something simple I'm missing. 🙏

Example of what I'm looking for

Ideally something like:

# What I hope exists in 0.13.x+
agent = SomeSimpleReActAgent.from_tools(...)  # New class/method?
# OR
agent = ReActAgent.create_from_tools(...)     # Renamed method?
# OR
agent = create_react_agent(...)               # Helper function?

Thanks for any help!

[sancelot]

the correct usage :

self.agent = ReActAgent(
           tools=self.tools,
           llm=llm,
           verbose=True,
           system_prompt=self.system_prompt,
       )