high severityAWS Bedrock Agents (with Knowledge Base), aws-samples/bedrock-chat sample app
Bot status stuck at "NOT Ready - This bot has not completed the knowledge synchronization" or "Waiting Sync" / indexing hangs indefinitely after adding PDF/knowledge files.
Root cause
EventBridge Pipe loads entire DynamoDB record (prompt + file metadata) into ECS task Container Overrides parameter, exceeding 8192 char limit when prompts >8000 chars or many docs (50-300 files). Causes 400 error: "Container Overrides length must be at most 8192".
AWS Bedrock Agentsknowledge basesync delayEventBridge PipesECSDynamoDBcontainer overrides