feat: dynamic subagent loading from SSM

agentclaw/app/agent_claw_main/main.py

@@ -68,6 +68,7 @@ from bedrock_agentcore.memory.integrations.strands.config import AgentCoreMemory
 from bedrock_agentcore.memory.integrations.strands.session_manager import AgentCoreMemorySessionManager
 # code_interpreter removed — causes [Errno 98] port 8080 conflict on warm container re-init
 from tools.code_interpreter import run_code
+from strands_tools import http_request, file_read
 
 app = BedrockAgentCoreApp()
 
@@ -87,6 +88,43 @@ except Exception as _e:
     print(traceback.format_exc())
 
 
+# ── Subagent loading ──────────────────────────────────────────────────────
+
+TOOL_PRESETS = {
+    "aws":       lambda: [MCPClient(lambda: aws_iam_streamablehttp_client(config.AWS_MCP_URL, aws_service="aws-mcp"))],
+    "coding":    lambda: [MCPClient(lambda: aws_iam_streamablehttp_client(config.AWS_MCP_URL, aws_service="aws-mcp")), run_code],
+    "documents": lambda: [http_request, file_read],
+}
+
+
+def _load_subagents(ssm_client) -> list:
+    """Load subagent definitions from SSM and return as tools."""
+    import json
+    try:
+        resp = ssm_client.get_parameter(Name='/agent-claw/subagents')
+        defs = json.loads(resp['Parameter']['Value'])
+    except Exception as e:
+        print(f'[main] Failed to load subagents from SSM: {type(e).__name__}: {e}')
+        return []
+    tools = []
+    for cfg in defs:
+        preset = cfg.get('tools', '')
+        if preset not in TOOL_PRESETS:
+            print(f'[main] Unknown tool preset "{preset}" for subagent "{cfg.get("name")}", skipping')
+            continue
+        try:
+            sub = Agent(
+                model=BedrockModel(model_id=cfg['model_id'], region_name='us-east-1'),
+                system_prompt=cfg['system_prompt'],
+                tools=TOOL_PRESETS[preset](),
+            )
+            tools.append(sub.as_tool(name=cfg['name'], description=cfg['description']))
+        except Exception as e:
+            print(f'[main] Failed to build subagent "{cfg.get("name")}": {type(e).__name__}: {e}')
+    print(f'[main] Loaded {len(tools)} subagent(s)')
+    return tools
+
+
 # ── Tool definitions ──────────────────────────────────────────────────────
 
 # NOTE: send_message tool removed — delivery handled by agent-runner streaming consumer
@@ -497,6 +535,7 @@ async def main(payload: dict, context):
     _time_str = _now.strftime('%A, %B %d, %Y %I:%M %p %Z')
     system_prompt = system_prompt + f'\n\nCurrent date/time: {_time_str}'
     system_prompt += 'AWS tools available: call_aws (any AWS API via AWS MCP Server), aws_list_lambda_functions, aws_get_cost_and_usage, aws_describe_service. Use call_aws directly for AWS API calls — do NOT say you lack AWS access.'
+    system_prompt += '\n\nSubagents available — use them aggressively to save cost and improve quality:\n- aws_agent: all AWS infrastructure, cost, resource, IAM, CloudWatch queries\n- coding_agent: code writing, builds, deployments, CodeBuild/AppRunner/ECR\n- document_agent: summarize URLs, extract data from documents, process long text\nDefault to delegating; only answer directly for simple conversational responses or tasks that don\'t fit a subagent.'
     print(f'[main] System prompt time injection: {_time_str}')
 
     # Model: claude-sonnet-4-6 via cross-region inference
@@ -519,7 +558,11 @@ async def main(payload: dict, context):
     mcp_connections = services.get('mcp_connections', [])
     mcp_clients, _mcp_to_close = mcp_loader.load_mcp_tools(mcp_connections, actor_id)
 
-    all_tools = base_tools + _aws_mcp_tools + mcp_clients
+    # Load subagents from SSM
+    ssm = boto3.client('ssm', region_name='us-east-1')
+    subagent_tools = _load_subagents(ssm)
+
+    all_tools = base_tools + _aws_mcp_tools + mcp_clients + subagent_tools
 
     agent = Agent(
         model=model,