The subagent runtime still advertised and executed only built-in tools, which left plugin-provided tools outside the Agent execution path. This change loads the same plugin-aware registry used by the CLI for subagent tool definitions, permission policy, and execution lookup so delegated runs can resolve plugin tools consistently.
Constraint: Plugin tools must respect the existing runtime plugin config and enabled-plugin state
Rejected: Thread plugin-specific exceptions through execute_tool directly | would bypass registry validation and duplicate lookup rules
Confidence: medium
Scope-risk: moderate
Reversibility: clean
Directive: Keep CLI and subagent registry construction aligned when plugin tool loading rules change
Tested: cargo test -p tools -p rusty-claude-cli
Not-tested: Live Anthropic subagent runs invoking plugin tools end-to-end
9e717192f8