Object of type AgentAction is not JSON serializable

[coreygarvey]

System Info

version 0.0.253

Running on a Jupyter Notebook in Google Colab

Who can help?

No response

Information

• The official example notebooks/scripts
• My own modified scripts

Related Components

• LLMs/Chat Models
• Embedding Models
• Prompts / Prompt Templates / Prompt Selectors
• Output Parsers
• Document Loaders
• Vector Stores / Retrievers
• Memory
• Agents / Agent Executors
• Tools / Toolkits
• Chains
• Callbacks/Tracing
• Async

Reproduction

Follow the steps in Access Intermediate Steps within the Agent "How To".

The final step calls for
print(json.dumps(response["intermediate_steps"], indent=2))

This is throwing the following error:
TypeError: Object of type AgentAction is not JSON serializable

Based on this issue I think it may be happening following a recent upgrade.

Expected behavior

Printing the intermediate steps as JSON.

[dosubot]

Answer generated by a 🤖

Answer

Hello,

The error you're encountering, "TypeError: Object of type AgentAction is not JSON serializable", is due to the fact that Python's built-in json.dumps() function doesn't know how to serialize the AgentAction object. It only knows how to serialize basic data types like dict, list, str, int, float, bool, None.

However, LangChain provides a dumps function in the dump.py file that can be used to serialize objects. This function uses a default function that checks if the object is an instance of the Serializable class and if so, calls the to_json method of the object. If the object is not an instance of Serializable, it calls the to_json_not_implemented function.

You can modify your code as follows:

from langchain.load.dump import dumps

print(dumps(response["intermediate_steps"], pretty=True))

This code will convert the AgentAction object and any other objects in the intermediate_steps into a JSON format that can be printed. If the object is an instance of Serializable, its to_json method will be called. If not, the to_json_not_implemented function will be called.

You can find more information about this in the following sources:

• docs/extras/modules/agents/how_to/intermediate_steps.ipynb
• libs/langchain/langchain/load/dump.py

Please try this solution and let me know if it resolves your issue or if you have any other questions.

Sources

• docs/extras/modules/agents/how_to/intermediate_steps.ipynb
• libs/langchain/langchain/load/dump.py

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[coreygarvey]

Excellent! This worked perfectly