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This guide focuses on Bedrock Agents supervisor for production systems, with practical trade-offs for reliability, security, and cost.
Bedrock Agents with action groups are only as safe as the OpenAPI you publish. A supervisor pattern means the orchestrator selects specialists, and every action group typechecks against real handlers before deploy.
⚡ TL;DR: Define action group OpenAPI from handler signatures; fail CI on drift. Supervisor agent may only call specialist agents/tools, never raw shell. Version action groups with the Lambda alias.
Bedrock Agents supervisor: production guidance
User → Supervisor (Bedrock Agent)
├─ PlanAgent (action group)
├─ CodeAgent (action group)
└─ ReviewAgent (action group)
python
# handlers/code_agent.py
from pydantic import BaseModel
class ApplyIntentIn(BaseModel):
run_id: str
intent_id: str
dry_run: bool = True
def apply_intent(event, _ctx):
inp = ApplyIntentIn.model_validate(event)
# ✅ never accept undeclared fields
return {"status": "ok", "intent_id": inp.intent_id, "dry_run": inp.dry_run}
OpenAPI must match handlers
yaml
# action-groups/code-agent.yaml
openapi: 3.0.0
info: { title: CodeAgent, version: "1.2.0" }
paths:
/apply_intent:
post:
operationId: apply_intent
requestBody:
required: true
content:
application/json:
schema:
$ref: "#/components/schemas/ApplyIntentIn"
bash
❌ Hand-editing OpenAPI in the console while Lambda code moved on — that is how agents call phantom ops.
# ✅ CI drift check
python scripts/openapi_vs_handlers.py \
--openapi action-groups/code-agent.yaml \
--handlers handlers/code_agent.py
Closing checklist
- [ ] Generate or verify OpenAPI from handlers
- [ ] Supervisor-only routing to specialists
- [ ] Pin Lambda aliases per action group version
- [ ] Schema-validate every invocation
- [ ] Integration test the supervisor path end-to-end
Series navigation
Day 55: Swarm Failure Modes · Day 57: Coding Agents That Only Emit Intents Last updated September 11, 2026 Related: Bedrock Agents: Idempotent Tool Calls Against DynamoDB Writes; Bedrock Agents Memory: Session Scratchpads Versus Long-Term Stores; Bedrock ApplyGuardrail API: Pre/Post Filters for Tool I/O in Coding Agents.Watch: 100 Days of AI on YouTube
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