Use sandbox client for builder validation

agent_builder/skills/deepagents-implementation-patterns/SKILL.md

@@ -1,12 +1,12 @@
 ---
 name: deepagents-implementation-patterns
-description: Implement DeepAgents inside a2a-pack agents with real deterministic tools, project skills, custom subagents, workspace-backed files, and ctx.llm-backed ChatOpenAI models. Use when editing create_deep_agent calls or deciding what belongs in tools, skills, or subagents.
+description: Implement DeepAgents inside a2a-pack agents with real deterministic tools, project skills, custom subagents, workspace-backed files, and ctx.llm-backed model resolution. Use when editing create_a2a_deep_agent calls or deciding what belongs in tools, skills, or subagents.
 ---
 # DeepAgents Implementation Patterns
 
 DeepAgents supplies the inner agent loop. In this platform, the reliable shape
-is: `ctx.llm`-backed `ChatOpenAI`, A2A workspace backend, project DeepAgents
-skills, and a small number of exact tools. Hosted generated agents should
+is: `ctx.llm`-backed `create_a2a_deep_agent`, A2A workspace backend, project
+DeepAgents skills, and a small number of exact tools. Hosted generated agents should
 declare `LLMProvisioning.PLATFORM`; explicit BYOK agents can declare
 `CALLER_PROVIDED`, but both modes still read the same `ctx.llm` object.
 
@@ -20,8 +20,7 @@ from pathlib import Path
 from typing import Any
 
 from langchain_core.tools import tool
-from langchain_openai import ChatOpenAI
-from deepagents import create_deep_agent
+from a2a_pack.deepagents import create_a2a_deep_agent
 
 RUNTIME_SKILLS_DIR = "research-agent/.deepagents/skills/"
 
@@ -39,13 +38,6 @@ def build_graph(ctx: Any) -> Any:
             "LLM credentials were not available; declare PLATFORM for hosted "
             "generated agents or configure caller-provided credentials."
         )
-    model = ChatOpenAI(
-        model=creds.model,
-        base_url=creds.base_url,
-        api_key=creds.api_key,
-        temperature=0.0,
-    )
-
     @tool
     def validate_citations(items_json: str) -> str:
         """Validate that each citation has title, url, and claim fields."""
@@ -58,8 +50,9 @@ def build_graph(ctx: Any) -> Any:
 
     backend = ctx.workspace_backend()
     skill_sources = seed_runtime_skills(backend, ctx)
-    return create_deep_agent(
-        model=model,
+    return create_a2a_deep_agent(
+        ctx,
+        creds=creds,
         backend=backend,
         skills=skill_sources or None,
         tools=[validate_citations],