[BUG] Unmatched curly braces should not be taken as interpolation

[ericdong79]

Description

Similar to this issue: https://github.com/crewAIInc/crewAI/issues/528 , I am trying to use JSON as the expected output in tasks.yaml file. However the curly braces in JSON will be taken as interpollation string and it will throw exception as below:

ValueError: unmatched '{' in format spec
An error occurred while running the crew: Command '['uv', 'run', 'run_crew']' returned non-zero exit status 1.

Steps to Reproduce

1. Put some json code in tasks.yaml, .e.g

...
expected_output: >
    You should return the JSON format as below:
    {
         "action":"<action_name>",
         "message":"<message_content>"
    }
...

3. Run the crew

Expected behavior

If found a mismatched curly brace, it should be ignored from the interpolation, instead of throwing error. This will be very helpful to specify expected JSON format in those YAML files.

Screenshots/Code snippets

read_intention_task: description: > Read the user's intentions: {intention}. Return the most relevant action and context information expected_output: > You need to return the action and context information in the following format: action: context: agent: intention_reader

operate_task: description: > Review the action and context you got and return the JSON format representation for the action and parameters. Here are detailed definition of each action.

expected_output: > You should return the JSON format as below: yaml { "action":"<action_name>", "message":"<message_content>" } agent: operator

Operating System

macOS Sonoma

Python Version

3.12

crewAI Version

0.86.0

crewAI Tools Version

0.17.0

Virtual Environment

Venv

Evidence

Possible Solution

If found a mismatched curly brace, it should be ignored from the interpolation, instead of throwing error. This will be very helpful to specify expected JSON format in those YAML files.

Additional context

N/A