Add agent configuration support with JSON/dict configs and tool name resolution v2

[mr-lee]

Resuming #865

Description

• Add AgentConfig class for loading configuration from JSON files or dicts
• Support model, prompt, and tools configuration options
• Update tool registry to resolve tool names from strands_tools package
• Maintain backward compatibility with existing Agent constructor
• Add comprehensive tests for configuration loading and validation

Usage example

For basic usage with the default set of tools available to choose from the config: file_read, editor, http_request, use_agent, and shell

from strands.experimental import AgentConfig

config = AgentConfig({"model": "test-model", "prompt": "Test prompt", "tools": ["file_read", "shell"]})
agent = config.to_agent() # kwargs are passed to the agent init

To configure the set of tools available to the config, you can supply your own tool registry:

from strands import tool
from strands.experimental import AgentConfig
from strands.tools.registry import ToolRegistry

@tool
def add(x: int, y: int) -> int:
    return x + y

tool_registry = ToolRegistry()
tool_registry.process_tools([add])

# Create config with tool selection
config = AgentConfig(
    {"model": "test-model", "prompt": "Test prompt", "tools": ["add"]}, tool_registry=tool_registry
)
agent = config.to_agent() # kwargs are passed to the agent init

You can also load a config from a file:

from strands.experimental import AgentConfig

config = AgentConfig("file://path/to/local/config) # Config gets loaded into dict
agent = config.to_agent() # kwargs are passed to the agent init

Documentation PR

strands-agents/docs#252

Type of Change

New feature

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[mr-lee]

Closing in favor of #935