Make use of microagents configurable in codeact_agent

[neubig]

What problem or use case are you trying to solve?

In codeact_agent.py, currently all microagents that have prompts in the micro directory are enabled by default:

OpenHands/openhands/agenthub/codeact_agent/codeact_agent.py

Lines 105 to 108 in 0633a99

	self.prompt_manager = PromptManager(
	microagent_dir=os.path.join(os.path.dirname(__file__), 'micro'),
	prompt_dir=os.path.join(os.path.dirname(__file__), 'prompts', 'tools'),
	)

OpenHands/openhands/utils/prompt.py

Lines 37 to 43 in 0633a99

	microagent_files = []
	if microagent_dir:
	microagent_files = [
	os.path.join(microagent_dir, f)
	for f in os.listdir(microagent_dir)
	if f.endswith('.md')
	]

Describe the UX of the solution you'd like

It would be better if we could customize (1) whether to use microagents, (2) which microagents to exclude.

We could add arguments to the AgentConfig that is passed in to CodeActAgent:

• use_microagents: bool whether to use at all
• disabled_microagents: list[str] a list of microagents to disable

Do you have thoughts on the technical implementation?

If use_microagents is set to False, we can simply set microagents_dir in PromptManager to None.

Additional context

Discussion on slack: https://openhands-ai.slack.com/archives/C07V9BMGHH6/p1731413460742369

[github-actions]

OpenHands started fixing the issue! You can monitor the progress here.

[github-actions]

A potential fix has been generated and a draft PR #4932 has been created. Please review the changes.