Implemented the next missing parity slice around agent configurations.

src/agent_runtime.py

@@ -15,10 +15,15 @@ from .agent_context_usage import collect_context_usage, estimate_tokens, format_
 from .compact import compact_conversation
 from .ask_user_runtime import AskUserRuntime
 from .agent_registry import (
+    delete_agent_definition,
     find_agent_definition,
+    normalize_mutable_source,
     load_agent_registry,
+    render_agent_mutation,
     render_agent_detail,
     render_agents_report,
+    scaffold_agent_definition,
+    update_agent_definition,
 )
 from .config_runtime import ConfigRuntime
 from .hook_policy import HookPolicyRuntime
@@ -3418,6 +3423,59 @@ class LocalCodingAgent:
         snapshot = self.load_agent_registry()
         return render_agent_detail(snapshot, agent_type)
 
+    def render_agent_create_report(
+        self,
+        agent_type: str,
+        *,
+        source: str = 'projectSettings',
+        description: str | None = None,
+        system_prompt: str | None = None,
+        overwrite: bool = False,
+    ) -> str:
+        result = scaffold_agent_definition(
+            self.runtime_config.cwd,
+            agent_type=agent_type,
+            source=normalize_mutable_source(source),
+            overwrite=overwrite,
+            description=description,
+            system_prompt=system_prompt,
+        )
+        return render_agent_mutation(result)
+
+    def render_agent_update_report(
+        self,
+        agent_type: str,
+        *,
+        source: str = 'auto',
+        description: str | None = None,
+        system_prompt: str | None = None,
+    ) -> str:
+        update_kwargs: dict[str, object] = {}
+        if description is not None:
+            update_kwargs['description'] = description
+        if system_prompt is not None:
+            update_kwargs['system_prompt'] = system_prompt
+        result = update_agent_definition(
+            self.runtime_config.cwd,
+            agent_type=agent_type,
+            source=normalize_mutable_source(source, allow_auto=True),
+            **update_kwargs,
+        )
+        return render_agent_mutation(result)
+
+    def render_agent_delete_report(
+        self,
+        agent_type: str,
+        *,
+        source: str = 'auto',
+    ) -> str:
+        result = delete_agent_definition(
+            self.runtime_config.cwd,
+            agent_type=agent_type,
+            source=normalize_mutable_source(source, allow_auto=True),
+        )
+        return render_agent_mutation(result)
+
     def render_memory_report(self) -> str:
         prompt_context = self.build_prompt_context()
         claude_md = prompt_context.user_context.get('claudeMd')