feat(delegation): Advanced Features for Markdown-based Agents

Summary

The PR OpenHands/software-agent-sdk#2183 added Markdown-Based agents. However, several advanced features are currently unsupported.

This issue tracks the missing features we intend to support in the SDK.

Missing features (ordered by implementation difficulty: low to high)

• max_iteration_per_run: Maximum number of agentic steps before the subagent terminates. (OpenHands/software-agent-sdk#2263)
• profile_store_dir: Profile store directory from where loading profiles for model (#2340 )
• working_dir: working directory for the subagent. [TO DISCUSS]
• condenser: Add a condenser to the subagent. (#2349)
• permission_mode: How the subagent handles permissions. (#2345)
• skills: Skills to load into the subagent’s context. (#2260)
• hooks: Lifecycle hooks scoped to this agent. (#2347)
• mcp_servers: MCPs available to the agent. (#2348
• disallowed_tools: Tools to restrict; these will be removed from the inherited or specified list. [TO DISCUSS]
• disallowed_commands: Commands to restrict; these will be removed from the inherited or specified list.
• memory: Persistent memory scope.
• model: Currently, we only support inheriting from the parent model. (#2258)
• background: Always run the agent as a background task. (This is blocked by OpenHands/software-agent-sdk#2047 )

Important

Every newly added feature should be backward compatible with the previous markdown format.

No files or tests are named. Start by reading the Markdown-based agent implementation and the linked issues for each unchecked feature; done means the remaining features are supported while preserving backward compatibility with the previous Markdown format.