SyncVals · Trajectory

s3-sqs-image-pipeline-kms

claude-code claude-opus-4-7 ✗ failed GOOD_FAILURE ↑ View task

Solved from the instruction alone, tests/ and solution/ were withheld from the agent's workspace and restored only for grading.

Reward = tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.

Classification , post-hoc; cannot change the reward

GOOD_FAILUREHonest miss, the agent ran correctly but couldn't solve it. Expected for a hard task; the task is sound.

SubtypeImplementation Bugs

EvidenceThree test failures reveal implementation bugs: (1) test_main_queue_and_dlq_exist_and_are_encrypted - DLQ created with SqsManagedSseEnabled instead of customer-managed CMK; (2) test_main_queue_policy_allows_s3_service - JSON policy has trailing escaped newline from jq -Rs escaping, causing json.decoder.JSONDecodeError at char 390; (3) test_lambda_handler_returns_correct_response_shape - handler returns empty batchItemFailures list instead of capturing exceptions and reporting failed message IDs. Instruction explicitly requires: 'everything has to be SSE-KMS with customer-managed keys' and 'handler does per-record error handling , bad records get reported back individually'.

Root causeAgent understood the requirements but made three implementation errors: (1) applied AWS-managed encryption to DLQ instead of customer-managed CMK like the main queue; (2) used incorrect jq escaping when setting queue policy attribute; (3) handler exception handling code didn't properly catch errors and return failed message IDs. These are coding mistakes, not specification gaps.

RecommendationN/A - task is fine. The instruction clearly specifies all requirements. Agent's own error message claimed success ('Verified: Direct-invoke with a mixed batch: response was exactly...') but actual implementation had bugs in DLQ encryption, policy JSON serialization, and exception handling. These are agent execution failures, not task problems.

Trajectory

Tool-by-tool agent trajectory

33 tool calls · 4 tool types · 42 steps

ok, nothing's built yet and the box is empty. localstack is at `http://localstack:4566`, creds are exported (`AWS_ACCESS_KEY_ID=test`, same for secret, region `us-east-1`), you've got `aws`, `python3`, `boto3`, `jq`, `zip`, `curl`. stand the whole thing up from scratch. we're building an image-ingest pipeline. someone drops an object into a source bucket and on the other end we want a processed copy in a dest bucket plus a row in dynamodb describing it. everything has to be SSE-KMS with customer-managed keys , the bucket on the way in, the queue in the middle, and the bucket on the way out. three separate CMKs, one per boundary. least privilege throughout. the verifier reads policy docs directly, so don't wildcard your way through kms. shape of it: - PUT to the source bucket fires an s3 ObjectCreated notification - notification lands on an SQS standard queue (SSE-KMS) - a lambda consumes the queue and for each record: reads the source object, writes a processed copy to the dest bucket at `processed/<same-key>`, and writes a row to ddb with `{object_key, source_size, processed_at, status: "OK"}` - there's a DLQ behind the main queue with a redrive policy - the handler does per-record error handling , bad records get reported back individually, good records in the same batch don't get retried done looks like: one PUT to the source bucket, and within 60s, exactly one object at `processed/<key>` in the dest bucket, exactly one ddb row keyed by `object_key`, and nothing in the DLQ. keys with spaces in them have to work too (the s3 event url-encodes them , you know where this is going). also, when the handler is invoked with a batch that contains a broken record alongside a good one, only the broken record's id comes back in the response and the good one isn't retried. couple of things to be careful about: the SQS visibility timeout needs to actually cover the lambda timeout or messages get redriven into the DLQ mid-processing. and the partial-batch-failure contract has two sides , both the event source mapping and the handler response shape need to match, or the whole batch retries on any single failure. the aws docs on `ReportBatchItemFailures` are worth a glance. names the verifier grabs by hand, use them exactly: | thing | name | |-|-| | source bucket | `ingest-source-bucket` | | dest bucket | `ingest-dest-bucket` | | main queue | `ingest-events` | | dlq | `ingest-dlq` | | source bucket CMK alias | `alias/source-bucket-cmk` | | sqs CMK alias | `alias/sqs-queue-cmk` | | dest bucket CMK alias | `alias/dest-bucket-cmk` | | lambda | `image-ingest-consumer` | | lambda role | `image-ingest-lambda-role` | | ddb table | `image-ingest-records` | ddb partition key is `object_key` (string), no sort key. lambda is python3.11, handler entrypoint `handler.lambda_handler`. localstack community 4.13.1. you've got 60 minutes.

Check environment and LocalStack connectivity

shell

ls /app && aws --version && python3 --version && echo "---" && aws --endpoint-url=http://localstack:4566 sts get-caller-identity

output

aws-cli/2.34.33 Python/3.14.4 Linux/6.10.14-linuxkit exe/aarch64.ubuntu.24
Python 3.12.3
---
{
    "UserId": "AKIAIOSFODNN7EXAMPLE",
    "Account": "000000000000",
    "Arn": "arn:aws:iam::000000000000:root"
}

[stdout]
aws-cli/2.34.33 Python/3.14.4 Linux/6.10.14-linuxkit exe/aarch64.ubuntu.24
Python 3.12.3
---
{
    "UserId": "AKIAIOSFODNN7EXAMPLE",
    "Account": "000000000000",
    "Arn": "arn:aws:iam::000000000000:root"
}

Check app directory and LocalStack health

shell

ls /app -la && export AWS_ENDPOINT_URL=http://localstack:4566 && aws --endpoint-url=$AWS_ENDPOINT_URL s3 ls && echo "---" && curl -s $AWS_ENDPOINT_URL/_localstack/health | head -c 500

output

total 8
drwxr-xr-x 2 root root 4096 Apr 21 20:05 .
drwxr-xr-x 1 root root 4096 Apr 22 08:40 ..
---
{"services": {"acm": "disabled", "apigateway": "disabled", "cloudformation": "disabled", "cloudwatch": "disabled", "config": "disabled", "dynamodb": "available", "dynamodbstreams": "available", "ec2": "disabled", "es": "disabled", "events": "available", "firehose": "disabled", "iam": "available", "kinesis": "available", "kms": "available", "lambda": "available", "logs": "available", "opensearch": "disabled", "redshift": "disabled", "resource-groups": "disabled", "resourcegroupstaggingapi": "disa

[stdout]
total 8
drwxr-xr-x 2 root root 4096 Apr 21 20:05 .
drwxr-xr-x 1 root root 4096 Apr 22 08:40 ..
---
{"services": {"acm": "disabled", "apigateway": "disabled", "cloudformation": "disabled", "cloudwatch": "disabled", "config": "disabled", "dynamodb": "available", "dynamodbstreams": "available", "ec2": "disabled", "es": "disabled", "events": "available", "firehose": "disabled", "iam": "available", "kinesis": "available", "kms": "available", "lambda": "available", "logs": "available", "opensearch": "disabled", "redshift": "disabled", "resource-groups": "disabled", "resourcegroupstaggingapi": "disa

I'll stand this up step by step. Let me start with the KMS keys since everything else depends on them.

Create working directories

shell

mkdir -p /app/build /app/policies /app/lambda && ls /app

output

build
lambda
policies

[stdout]
build
lambda
policies

write · /app/policies/kms-source-bucket.json

{
  "Version": "2012-10-17",
  "Id": "source-bucket-cmk-policy",
  "Statement": [
    {
      "Sid": "EnableRootAccountAdmin",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::000000000000:root"
      },
      "Action": "kms:*",
      "Resource": "*"
    },
    {
      "Sid": "AllowLambdaRoleDecryptSourceObjects",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::000000000000:role/image-ingest-lambda-role"
      },
      "Action": [
        "kms:Decrypt",
        "kms:DescribeKey"
      ],
      "Resource": "*"
    }
  ]
}

write · /app/policies/kms-sqs-queue.json

{
  "Version": "2012-10-17",
  "Id": "sqs-queue-cmk-policy",
  "Statement": [
    {
      "Sid": "EnableRootAccountAdmin",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::000000000000:root"
      },
      "Action": "kms:*",
      "Resource": "*"
    },
    {
      "Sid": "AllowS3ToEncryptMessagesForQueue",
      "Effect": "Allow",
      "Principal": {
        "Service": "s3.amazonaws.com"
      },
      "Action": [
        "kms:GenerateDataKey",
        "kms:Decrypt"
      ],
      "Resource": "*"
    },
    {
      "Sid": "AllowLambdaRoleConsumeEncryptedMessages",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::000000000000:role/image-ingest-lambda-role"
      },
      "Action": [
        "kms:Decrypt",
        "kms:GenerateDataKey",
        "kms:DescribeKey"
      ],
      "Resource": "*"
    }
  ]
}

write · /app/policies/kms-dest-bucket.json

{
  "Version": "2012-10-17",
  "Id": "dest-bucket-cmk-policy",
  "Statement": [
    {
      "Sid": "EnableRootAccountAdmin",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::000000000000:root"
      },
      "Action": "kms:*",
      "Resource": "*"
    },
    {
      "Sid": "AllowLambdaRoleEncryptProcessedObjects",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::000000000000:role/image-ingest-lambda-role"
      },
      "Action": [
        "kms:GenerateDataKey",
        "kms:Encrypt",
        "kms:DescribeKey"
      ],
      "Resource": "*"
    }
  ]
}

Create three KMS CMKs with policies and aliases

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && \
SRC_KEY=$(aws --endpoint-url=$AWS_ENDPOINT_URL kms create-key --description "source-bucket CMK" --policy file:///app/policies/kms-source-bucket.json --query 'KeyMetadata.KeyId' --output text) && echo "SRC_KEY=$SRC_KEY" > /app/build/vars.sh && \
aws --endpoint-url=$AWS_ENDPOINT_URL kms create-alias --alias-name alias/source-bucket-cmk --target-key-id $SRC_KEY && \
SQS_KEY=$(aws --endpoint-url=$AWS_ENDPOINT_URL kms create-key --description "sqs-queue CMK" --policy file:///app/policies/kms-sqs-queue.json --query 'KeyMetadata.KeyId' --output text) && echo "SQS_KEY=$SQS_KEY" >> /app/build/vars.sh && \
aws --endpoint-url=$AWS_ENDPOINT_URL kms create-alias --alias-name alias/sqs-queue-cmk --target-key-id $SQS_KEY && \
DST_KEY=$(aws --endpoint-url=$AWS_ENDPOINT_URL kms create-key --description "dest-bucket CMK" --policy file:///app/policies/kms-dest-bucket.json --query 'KeyMetadata.KeyId' --output text) && echo "DST_KEY=$DST_KEY" >> /app/build/vars.sh && \
aws --endpoint-url=$AWS_ENDPOINT_URL kms create-alias --alias-name alias/dest-bucket-cmk --target-key-id $DST_KEY && \
cat /app/build/vars.sh

output

SRC_KEY=3e421f97-9be9-4d2c-8934-b9ece620d63e
SQS_KEY=8dbfa037-0ef7-4dfb-a71f-bb391bdc64cd
DST_KEY=ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2

[stdout]
SRC_KEY=3e421f97-9be9-4d2c-8934-b9ece620d63e
SQS_KEY=8dbfa037-0ef7-4dfb-a71f-bb391bdc64cd
DST_KEY=ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2

KMS keys created. Now the IAM role for Lambda.

write · /app/policies/lambda-trust.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

ToolSearch

{
  "query": "select:TodoWrite",
  "max_results": 1
}

, output, 
{"type": "tool_reference", "tool_name": "TodoWrite"}

Create KMS CMKs (3) + aliases
Create Lambda IAM role + least-privilege inline policies
Create DynamoDB table
Create DLQ + main SQS queue (SSE-KMS, redrive)
Create source + dest buckets with SSE-KMS default encryption
Wire S3 ObjectCreated -> SQS notification
Package + deploy Lambda with ReportBatchItemFailures
Create SQS->Lambda event source mapping
End-to-end test: normal key, key with spaces, partial batch failure, DLQ empty

write · /app/policies/lambda-inline.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Logs",
      "Effect": "Allow",
      "Action": [
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource": "arn:aws:logs:us-east-1:000000000000:log-group:/aws/lambda/image-ingest-consumer*"
    },
    {
      "Sid": "ConsumeFromMainQueue",
      "Effect": "Allow",
      "Action": [
        "sqs:ReceiveMessage",
        "sqs:DeleteMessage",
        "sqs:GetQueueAttributes",
        "sqs:ChangeMessageVisibility"
      ],
      "Resource": "arn:aws:sqs:us-east-1:000000000000:ingest-events"
    },
    {
      "Sid": "ReadSourceObjects",
      "Effect": "Allow",
      "Action": [
        "s3:GetObject"
      ],
      "Resource": "arn:aws:s3:::ingest-source-bucket/*"
    },
    {
      "Sid": "WriteProcessedObjects",
      "Effect": "Allow",
      "Action": [
        "s3:PutObject"
      ],
      "Resource": "arn:aws:s3:::ingest-dest-bucket/processed/*"
    },
    {
      "Sid": "WriteDdbRecord",
      "Effect": "Allow",
      "Action": [
        "dynamodb:PutItem"
      ],
      "Resource": "arn:aws:dynamodb:us-east-1:000000000000:table/image-ingest-records"
    },
    {
      "Sid": "DecryptSqsMessages",
      "Effect": "Allow",
      "Action": [
        "kms:Decrypt",
        "kms:GenerateDataKey",
        "kms:DescribeKey"
      ],
      "Resource": "arn:aws:kms:us-east-1:000000000000:key/SQS_KEY_PLACEHOLDER"
    },
    {
      "Sid": "DecryptSourceObjects",
      "Effect": "Allow",
      "Action": [
        "kms:Decrypt",
        "kms:DescribeKey"
      ],
      "Resource": "arn:aws:kms:us-east-1:000000000000:key/SRC_KEY_PLACEHOLDER"
    },
    {
      "Sid": "EncryptDestObjects",
      "Effect": "Allow",
      "Action": [
        "kms:Encrypt",
        "kms:GenerateDataKey",
        "kms:DescribeKey"
      ],
      "Resource": "arn:aws:kms:us-east-1:000000000000:key/DST_KEY_PLACEHOLDER"
    }
  ]
}

Create Lambda IAM role with inline least-privilege policy

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
sed -e "s|SQS_KEY_PLACEHOLDER|$SQS_KEY|g" \
    -e "s|SRC_KEY_PLACEHOLDER|$SRC_KEY|g" \
    -e "s|DST_KEY_PLACEHOLDER|$DST_KEY|g" \
    /app/policies/lambda-inline.json > /app/build/lambda-inline.json && \
aws --endpoint-url=$AWS_ENDPOINT_URL iam create-role \
  --role-name image-ingest-lambda-role \
  --assume-role-policy-document file:///app/policies/lambda-trust.json \
  --query 'Role.Arn' --output text && \
aws --endpoint-url=$AWS_ENDPOINT_URL iam put-role-policy \
  --role-name image-ingest-lambda-role \
  --policy-name image-ingest-lambda-inline \
  --policy-document file:///app/build/lambda-inline.json && \
echo "role created"

output

arn:aws:iam::000000000000:role/image-ingest-lambda-role
role created

[stdout]
arn:aws:iam::000000000000:role/image-ingest-lambda-role
role created

Create KMS CMKs (3) + aliases
Create Lambda IAM role + least-privilege inline policies
Create DynamoDB table
Create DLQ + main SQS queue (SSE-KMS, redrive)
Create source + dest buckets with SSE-KMS default encryption
Wire S3 ObjectCreated -> SQS notification
Package + deploy Lambda with ReportBatchItemFailures
Create SQS->Lambda event source mapping
End-to-end test: normal key, key with spaces, partial batch failure, DLQ empty

Create DynamoDB table

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && \
aws --endpoint-url=$AWS_ENDPOINT_URL dynamodb create-table \
  --table-name image-ingest-records \
  --attribute-definitions AttributeName=object_key,AttributeType=S \
  --key-schema AttributeName=object_key,KeyType=HASH \
  --billing-mode PAY_PER_REQUEST \
  --query 'TableDescription.TableArn' --output text

output

arn:aws:dynamodb:us-east-1:000000000000:table/image-ingest-records

[stdout]
arn:aws:dynamodb:us-east-1:000000000000:table/image-ingest-records

Now the DLQ and the main queue (SSE-KMS, with redrive policy + a policy that lets S3 send to it).

Create DLQ

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
aws --endpoint-url=$AWS_ENDPOINT_URL sqs create-queue \
  --queue-name ingest-dlq \
  --attributes '{"SqsManagedSseEnabled":"true","MessageRetentionPeriod":"1209600"}' \
  --query 'QueueUrl' --output text | tee /app/build/dlq-url.txt && \
DLQ_URL=$(cat /app/build/dlq-url.txt) && \
DLQ_ARN=$(aws --endpoint-url=$AWS_ENDPOINT_URL sqs get-queue-attributes --queue-url $DLQ_URL --attribute-names QueueArn --query 'Attributes.QueueArn' --output text) && \
echo "DLQ_URL=$DLQ_URL" >> /app/build/vars.sh && \
echo "DLQ_ARN=$DLQ_ARN" >> /app/build/vars.sh && \
echo "DLQ_ARN=$DLQ_ARN"

output

http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/ingest-dlq
DLQ_ARN=arn:aws:sqs:us-east-1:000000000000:ingest-dlq

[stdout]
http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/ingest-dlq
DLQ_ARN=arn:aws:sqs:us-east-1:000000000000:ingest-dlq

Create main queue with SSE-KMS + redrive

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
cat > /app/build/main-queue-attrs.json <<EOF
{
  "VisibilityTimeout": "180",
  "MessageRetentionPeriod": "345600",
  "KmsMasterKeyId": "$SQS_KEY",
  "KmsDataKeyReusePeriodSeconds": "300",
  "RedrivePolicy": "{\"deadLetterTargetArn\":\"$DLQ_ARN\",\"maxReceiveCount\":\"5\"}"
}
EOF
aws --endpoint-url=$AWS_ENDPOINT_URL sqs create-queue \
  --queue-name ingest-events \
  --attributes file:///app/build/main-queue-attrs.json \
  --query 'QueueUrl' --output text | tee /app/build/main-url.txt && \
MAIN_URL=$(cat /app/build/main-url.txt) && \
MAIN_ARN=$(aws --endpoint-url=$AWS_ENDPOINT_URL sqs get-queue-attributes --queue-url $MAIN_URL --attribute-names QueueArn --query 'Attributes.QueueArn' --output text) && \
echo "MAIN_URL=$MAIN_URL" >> /app/build/vars.sh && \
echo "MAIN_ARN=$MAIN_ARN" >> /app/build/vars.sh && \
echo "MAIN_ARN=$MAIN_ARN"

output

http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/ingest-events
MAIN_ARN=arn:aws:sqs:us-east-1:000000000000:ingest-events

[stdout]
http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/ingest-events
MAIN_ARN=arn:aws:sqs:us-east-1:000000000000:ingest-events

Attach SQS resource policy allowing S3 to SendMessage

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
cat > /app/build/queue-policy.json <<EOF
{
  "Version": "2012-10-17",
  "Id": "ingest-events-policy",
  "Statement": [
    {
      "Sid": "AllowS3SourceBucketToSendMessage",
      "Effect": "Allow",
      "Principal": { "Service": "s3.amazonaws.com" },
      "Action": "sqs:SendMessage",
      "Resource": "$MAIN_ARN",
      "Condition": {
        "ArnEquals": { "aws:SourceArn": "arn:aws:s3:::ingest-source-bucket" },
        "StringEquals": { "aws:SourceAccount": "000000000000" }
      }
    }
  ]
}
EOF
aws --endpoint-url=$AWS_ENDPOINT_URL sqs set-queue-attributes \
  --queue-url $MAIN_URL \
  --attributes "Policy=$(cat /app/build/queue-policy.json | jq -c . | jq -Rs .)" && \
echo "queue policy set"

output

queue policy set

[stdout]
queue policy set

Create KMS CMKs (3) + aliases
Create Lambda IAM role + least-privilege inline policies
Create DynamoDB table
Create DLQ + main SQS queue (SSE-KMS, redrive)
Create source + dest buckets with SSE-KMS default encryption
Wire S3 ObjectCreated -> SQS notification
Package + deploy Lambda with ReportBatchItemFailures
Create SQS->Lambda event source mapping
End-to-end test: normal key, key with spaces, partial batch failure, DLQ empty

Create S3 buckets with SSE-KMS default encryption

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3api create-bucket --bucket ingest-source-bucket --query 'Location' --output text && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3api create-bucket --bucket ingest-dest-bucket --query 'Location' --output text && \
cat > /app/build/src-enc.json <<EOF
{
  "Rules": [
    {
      "ApplyServerSideEncryptionByDefault": {
        "SSEAlgorithm": "aws:kms",
        "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/$SRC_KEY"
      },
      "BucketKeyEnabled": false
    }
  ]
}
EOF
cat > /app/build/dst-enc.json <<EOF
{
  "Rules": [
    {
      "ApplyServerSideEncryptionByDefault": {
        "SSEAlgorithm": "aws:kms",
        "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/$DST_KEY"
      },
      "BucketKeyEnabled": false
    }
  ]
}
EOF
aws --endpoint-url=$AWS_ENDPOINT_URL s3api put-bucket-encryption --bucket ingest-source-bucket --server-side-encryption-configuration file:///app/build/src-enc.json && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3api put-bucket-encryption --bucket ingest-dest-bucket --server-side-encryption-configuration file:///app/build/dst-enc.json && \
echo "---encryption configured" && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3api get-bucket-encryption --bucket ingest-source-bucket && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3api get-bucket-encryption --bucket ingest-dest-bucket

output

/ingest-source-bucket
/ingest-dest-bucket
---encryption configured
{
    "ServerSideEncryptionConfiguration": {
        "Rules": [
            {
                "ApplyServerSideEncryptionByDefault": {
                    "SSEAlgorithm": "aws:kms",
                    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/3e421f97-9be9-4d2c-8934-b9ece620d63e"
                },
                "BucketKeyEnabled": false
            }
        ]
    }
}
{
    "ServerSideEncryptionConfiguration": {
        "Rules": [
            {
                "ApplyServerSideEncryptionByDefault": {
                    "SSEAlgorithm": "aws:kms",
                    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2"
                },
                "BucketKeyEnabled": false
            }
        ]
    }
}

[stdout]
/ingest-source-bucket
/ingest-dest-bucket
---encryption configured
{
    "ServerSideEncryptionConfiguration": {
        "Rules": [
            {
                "ApplyServerSideEncryptionByDefault": {
                    "SSEAlgorithm": "aws:kms",
                    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/3e421f97-9be9-4d2c-8934-b9ece620d63e"
                },
                "BucketKeyEnabled": false
            }
        ]
    }
}
{
    "ServerSideEncryptionConfiguration": {
        "Rules": [
            {
                "ApplyServerSideEncryptionByDefault": {
                    "SSEAlgorithm": "aws:kms",
                    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2"
                },
                "BucketKeyEnabled": false
            }
        ]
    }
}

Now the S3 notification.

Attach S3->SQS notification

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
cat > /app/build/notif.json <<EOF
{
  "QueueConfigurations": [
    {
      "Id": "ingest-events-objectcreated",
      "QueueArn": "$MAIN_ARN",
      "Events": ["s3:ObjectCreated:*"]
    }
  ]
}
EOF
aws --endpoint-url=$AWS_ENDPOINT_URL s3api put-bucket-notification-configuration \
  --bucket ingest-source-bucket \
  --notification-configuration file:///app/build/notif.json && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3api get-bucket-notification-configuration --bucket ingest-source-bucket

output

{
    "QueueConfigurations": [
        {
            "Id": "ingest-events-objectcreated",
            "QueueArn": "arn:aws:sqs:us-east-1:000000000000:ingest-events",
            "Events": [
                "s3:ObjectCreated:*"
            ]
        }
    ]
}

[stdout]
{
    "QueueConfigurations": [
        {
            "Id": "ingest-events-objectcreated",
            "QueueArn": "arn:aws:sqs:us-east-1:000000000000:ingest-events",
            "Events": [
                "s3:ObjectCreated:*"
            ]
        }
    ]
}

Create KMS CMKs (3) + aliases
Create Lambda IAM role + least-privilege inline policies
Create DynamoDB table
Create DLQ + main SQS queue (SSE-KMS, redrive)
Create source + dest buckets with SSE-KMS default encryption
Wire S3 ObjectCreated -> SQS notification
Package + deploy Lambda with ReportBatchItemFailures
Create SQS->Lambda event source mapping
End-to-end test: normal key, key with spaces, partial batch failure, DLQ empty

write · /app/lambda/handler.py

import json
import logging
import os
from datetime import datetime, timezone
from urllib.parse import unquote_plus

import boto3

log = logging.getLogger()
log.setLevel(logging.INFO)

_ENDPOINT = os.environ.get("AWS_ENDPOINT_URL") or os.environ.get("LOCALSTACK_ENDPOINT")

_boto_kwargs = {"endpoint_url": _ENDPOINT} if _ENDPOINT else {}

s3 = boto3.client("s3", **_boto_kwargs)
ddb = boto3.client("dynamodb", **_boto_kwargs)

DEST_BUCKET = os.environ["DEST_BUCKET"]
TABLE_NAME = os.environ["TABLE_NAME"]
DEST_KMS_KEY_ARN = os.environ["DEST_KMS_KEY_ARN"]


def _process_s3_record(s3_rec):
    bucket = s3_rec["s3"]["bucket"]["name"]
    # S3 event notifications URL-encode keys (spaces -> "+", etc.)
    raw_key = s3_rec["s3"]["object"]["key"]
    key = unquote_plus(raw_key)

    obj = s3.get_object(Bucket=bucket, Key=key)
    body = obj["Body"].read()
    size = obj.get("ContentLength", len(body))

    dest_key = f"processed/{key}"
    s3.put_object(
        Bucket=DEST_BUCKET,
        Key=dest_key,
        Body=body,
        ServerSideEncryption="aws:kms",
        SSEKMSKeyId=DEST_KMS_KEY_ARN,
    )

    ddb.put_item(
        TableName=TABLE_NAME,
        Item={
            "object_key": {"S": key},
            "source_size": {"N": str(size)},
            "processed_at": {"S": datetime.now(timezone.utc).isoformat()},
            "status": {"S": "OK"},
        },
    )
    return key


def lambda_handler(event, context):
    batch_item_failures = []
    for record in event.get("Records", []):
        message_id = record.get("messageId")
        try:
            body = json.loads(record["body"])
            # S3 test events have no "Records" , ignore gracefully
            s3_records = body.get("Records") or []
            if not s3_records:
                log.info("no s3 records in message %s, skipping", message_id)
                continue
            for s3_rec in s3_records:
                key = _process_s3_record(s3_rec)
                log.info("processed %s", key)
        except Exception:
            log.exception("failed to process message %s", message_id)
            batch_item_failures.append({"itemIdentifier": message_id})

    return {"batchItemFailures": batch_item_failures}

Package and deploy Lambda

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
cd /app/lambda && zip -q /app/build/handler.zip handler.py && ls -la /app/build/handler.zip && \
ROLE_ARN=arn:aws:iam::000000000000:role/image-ingest-lambda-role && \
DEST_KMS_ARN=arn:aws:kms:us-east-1:000000000000:key/$DST_KEY && \
aws --endpoint-url=$AWS_ENDPOINT_URL lambda create-function \
  --function-name image-ingest-consumer \
  --runtime python3.11 \
  --role $ROLE_ARN \
  --handler handler.lambda_handler \
  --zip-file fileb:///app/build/handler.zip \
  --timeout 30 \
  --environment "Variables={DEST_BUCKET=ingest-dest-bucket,TABLE_NAME=image-ingest-records,DEST_KMS_KEY_ARN=$DEST_KMS_ARN,AWS_ENDPOINT_URL=http://localstack:4566}" \
  --query 'FunctionArn' --output text

output

-rw-r--r-- 1 root root 1147 Apr 22 08:44 /app/build/handler.zip
arn:aws:lambda:us-east-1:000000000000:function:image-ingest-consumer

[stdout]
-rw-r--r-- 1 root root 1147 Apr 22 08:44 /app/build/handler.zip
arn:aws:lambda:us-east-1:000000000000:function:image-ingest-consumer

Wait for Lambda to become Active

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && \
for i in 1 2 3 4 5 6 7 8 9 10; do
  STATE=$(aws --endpoint-url=$AWS_ENDPOINT_URL lambda get-function --function-name image-ingest-consumer --query 'Configuration.State' --output text 2>/dev/null)
  echo "state=$STATE"
  [ "$STATE" = "Active" ] && break
  sleep 2
done

output

state=Active

[stdout]
state=Active

Create event source mapping with ReportBatchItemFailures

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
aws --endpoint-url=$AWS_ENDPOINT_URL lambda create-event-source-mapping \
  --function-name image-ingest-consumer \
  --event-source-arn $MAIN_ARN \
  --batch-size 10 \
  --maximum-batching-window-in-seconds 1 \
  --function-response-types ReportBatchItemFailures \
  --query 'UUID' --output text | tee /app/build/esm-uuid.txt

output

08323bb1-ce6e-4498-ad39-959e3617e71b

[stdout]
08323bb1-ce6e-4498-ad39-959e3617e71b

Verify event source mapping enabled

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && \
ESM_UUID=$(cat /app/build/esm-uuid.txt) && \
for i in 1 2 3 4 5 6 7 8 9 10; do
  STATE=$(aws --endpoint-url=$AWS_ENDPOINT_URL lambda get-event-source-mapping --uuid $ESM_UUID --query 'State' --output text 2>/dev/null)
  echo "esm_state=$STATE"
  [ "$STATE" = "Enabled" ] && break
  sleep 2
done
aws --endpoint-url=$AWS_ENDPOINT_URL lambda get-event-source-mapping --uuid $ESM_UUID --query '{State:State,FnRespTypes:FunctionResponseTypes,BatchSize:BatchSize}'

output

esm_state=Enabled
{
    "State": "Enabled",
    "FnRespTypes": [
        "ReportBatchItemFailures"
    ],
    "BatchSize": 10
}

[stdout]
esm_state=Enabled
{
    "State": "Enabled",
    "FnRespTypes": [
        "ReportBatchItemFailures"
    ],
    "BatchSize": 10
}

Create KMS CMKs (3) + aliases
Create Lambda IAM role + least-privilege inline policies
Create DynamoDB table
Create DLQ + main SQS queue (SSE-KMS, redrive)
Create source + dest buckets with SSE-KMS default encryption
Wire S3 ObjectCreated -> SQS notification
Package + deploy Lambda with ReportBatchItemFailures
Create SQS->Lambda event source mapping
End-to-end test: normal key, key with spaces, partial batch failure, DLQ empty

Now end-to-end tests: normal key, key with spaces, and a direct-invoke partial-batch-failure test.

Upload test objects including one with spaces

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
echo "hello world" > /tmp/test1.txt && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3 cp /tmp/test1.txt s3://ingest-source-bucket/test1.txt && \
echo "spaces content" > "/tmp/file with spaces.txt" && \
aws --endpoint-url=$AWS_ENDPOINT_URL s3 cp "/tmp/file with spaces.txt" "s3://ingest-source-bucket/file with spaces.txt" && \
echo "uploads done"

output

Completed 12 Bytes/12 Bytes (712 Bytes/s) with 1 file(s) remaining
upload: ../../tmp/test1.txt to s3://ingest-source-bucket/test1.txt
Completed 15 Bytes/15 Bytes (2.6 KiB/s) with 1 file(s) remaining
upload: ../../tmp/file with spaces.txt to s3://ingest-source-bucket/file with spaces.txt
uploads done

[stdout]
Completed 12 Bytes/12 Bytes (712 Bytes/s) with 1 file(s) remaining
upload: ../../tmp/test1.txt to s3://ingest-source-bucket/test1.txt
Completed 15 Bytes/15 Bytes (2.6 KiB/s) with 1 file(s) remaining
upload: ../../tmp/file with spaces.txt to s3://ingest-source-bucket/file with spaces.txt
uploads done

Verify processed objects and DDB rows after S3 notification pipeline

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && sleep 8 && \
echo "--- dest bucket:" && aws --endpoint-url=$AWS_ENDPOINT_URL s3 ls s3://ingest-dest-bucket/ --recursive && \
echo "--- ddb scan:" && aws --endpoint-url=$AWS_ENDPOINT_URL dynamodb scan --table-name image-ingest-records --query 'Items[*].{key:object_key.S,size:source_size.N,status:status.S}' && \
echo "--- dlq depth:" && source /app/build/vars.sh && aws --endpoint-url=$AWS_ENDPOINT_URL sqs get-queue-attributes --queue-url $DLQ_URL --attribute-names ApproximateNumberOfMessages ApproximateNumberOfMessagesNotVisible --query 'Attributes'

output

--- dest bucket:
2026-04-22 08:44:59         15 processed/file with spaces.txt
2026-04-22 08:44:59         12 processed/test1.txt
--- ddb scan:
[
    {
        "key": "test1.txt",
        "size": "12",
        "status": "OK"
    },
    {
        "key": "file with spaces.txt",
        "size": "15",
        "status": "OK"
    }
]
--- dlq depth:
{
    "ApproximateNumberOfMessages": "0",
    "ApproximateNumberOfMessagesNotVisible": "0"
}

[stdout]
--- dest bucket:
2026-04-22 08:44:59         15 processed/file with spaces.txt
2026-04-22 08:44:59         12 processed/test1.txt
--- ddb scan:
[
    {
        "key": "test1.txt",
        "size": "12",
        "status": "OK"
    },
    {
        "key": "file with spaces.txt",
        "size": "15",
        "status": "OK"
    }
]
--- dlq depth:
{
    "ApproximateNumberOfMessages": "0",
    "ApproximateNumberOfMessagesNotVisible": "0"
}

Excellent , normal key and key with spaces both land correctly, DLQ is empty. Now the partial-batch-failure test.

write · /app/build/partial-batch.json

{
  "Records": [
    {
      "messageId": "good-msg-id",
      "receiptHandle": "r1",
      "body": "{\"Records\":[{\"s3\":{\"bucket\":{\"name\":\"ingest-source-bucket\"},\"object\":{\"key\":\"test1.txt\"}}}]}",
      "eventSource": "aws:sqs"
    },
    {
      "messageId": "broken-msg-id",
      "receiptHandle": "r2",
      "body": "{\"Records\":[{\"s3\":{\"bucket\":{\"name\":\"ingest-source-bucket\"},\"object\":{\"key\":\"does-not-exist-key-xyz\"}}}]}",
      "eventSource": "aws:sqs"
    }
  ]
}

Invoke Lambda with partial-batch event

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && \
aws --endpoint-url=$AWS_ENDPOINT_URL lambda invoke \
  --function-name image-ingest-consumer \
  --payload fileb:///app/build/partial-batch.json \
  --cli-binary-format raw-in-base64-out \
  /tmp/resp.json >/dev/null && \
echo "--- response:" && cat /tmp/resp.json && echo

output

--- response:
{"batchItemFailures": [{"itemIdentifier": "broken-msg-id"}]}

[stdout]
--- response:
{"batchItemFailures": [{"itemIdentifier": "broken-msg-id"}]}

Partial-batch-failure contract works: only `broken-msg-id` in the response, the good record not retried.

Final verification of the full stack

shell

export AWS_ENDPOINT_URL=http://localstack:4566 && source /app/build/vars.sh && \
echo "=== FINAL VERIFICATION ===" && \
echo "--- KMS aliases:" && aws --endpoint-url=$AWS_ENDPOINT_URL kms list-aliases --query 'Aliases[?starts_with(AliasName, `alias/source-bucket-cmk`) || starts_with(AliasName, `alias/sqs-queue-cmk`) || starts_with(AliasName, `alias/dest-bucket-cmk`)].[AliasName,TargetKeyId]' --output table && \
echo "--- source bucket enc:" && aws --endpoint-url=$AWS_ENDPOINT_URL s3api get-bucket-encryption --bucket ingest-source-bucket --query 'ServerSideEncryptionConfiguration.Rules[0].ApplyServerSideEncryptionByDefault' && \
echo "--- dest bucket enc:" && aws --endpoint-url=$AWS_ENDPOINT_URL s3api get-bucket-encryption --bucket ingest-dest-bucket --query 'ServerSideEncryptionConfiguration.Rules[0].ApplyServerSideEncryptionByDefault' && \
echo "--- main queue attrs:" && aws --endpoint-url=$AWS_ENDPOINT_URL sqs get-queue-attributes --queue-url $MAIN_URL --attribute-names KmsMasterKeyId VisibilityTimeout RedrivePolicy --query 'Attributes' && \
echo "--- ESM:" && aws --endpoint-url=$AWS_ENDPOINT_URL lambda list-event-source-mappings --function-name image-ingest-consumer --query 'EventSourceMappings[0].{State:State,FnResp:FunctionResponseTypes,Queue:EventSourceArn}' && \
echo "--- dest bucket contents:" && aws --endpoint-url=$AWS_ENDPOINT_URL s3 ls s3://ingest-dest-bucket/ --recursive && \
echo "--- DDB count:" && aws --endpoint-url=$AWS_ENDPOINT_URL dynamodb scan --table-name image-ingest-records --select COUNT --query 'Count' && \
echo "--- DLQ depth:" && aws --endpoint-url=$AWS_ENDPOINT_URL sqs get-queue-attributes --queue-url $DLQ_URL --attribute-names ApproximateNumberOfMessages --query 'Attributes.ApproximateNumberOfMessages'

output

=== FINAL VERIFICATION ===
--- KMS aliases:
---------------------------------------------------------------------
|                            ListAliases                            |
+--------------------------+----------------------------------------+
|  alias/source-bucket-cmk |  3e421f97-9be9-4d2c-8934-b9ece620d63e  |
|  alias/sqs-queue-cmk     |  8dbfa037-0ef7-4dfb-a71f-bb391bdc64cd  |
|  alias/dest-bucket-cmk   |  ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2  |
+--------------------------+----------------------------------------+
--- source bucket enc:
{
    "SSEAlgorithm": "aws:kms",
    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/3e421f97-9be9-4d2c-8934-b9ece620d63e"
}
--- dest bucket enc:
{
    "SSEAlgorithm": "aws:kms",
    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2"
}
--- main queue attrs:
{
    "KmsMasterKeyId": "8dbfa037-0ef7-4dfb-a71f-bb391bdc64cd",
    "VisibilityTimeout": "180",
    "RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:000000000000:ingest-dlq\",\"maxReceiveCount\":\"5\"}"
}
--- ESM:
{
    "State": "Enabled",
    "FnResp": [
        "ReportBatchItemFailures"
    ],
    "Queue": "arn:aws:sqs:us-east-1:000000000000:ingest-events"
}
--- dest bucket contents:
2026-04-22 08:44:59         15 processed/file with spaces.txt
2026-04-22 08:45:17         12 processed/test1.txt
--- DDB count:
2
--- DLQ depth:
"0"

[stdout]
=== FINAL VERIFICATION ===
--- KMS aliases:
---------------------------------------------------------------------
|                            ListAliases                            |
+--------------------------+----------------------------------------+
|  alias/source-bucket-cmk |  3e421f97-9be9-4d2c-8934-b9ece620d63e  |
|  alias/sqs-queue-cmk     |  8dbfa037-0ef7-4dfb-a71f-bb391bdc64cd  |
|  alias/dest-bucket-cmk   |  ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2  |
+--------------------------+----------------------------------------+
--- source bucket enc:
{
    "SSEAlgorithm": "aws:kms",
    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/3e421f97-9be9-4d2c-8934-b9ece620d63e"
}
--- dest bucket enc:
{
    "SSEAlgorithm": "aws:kms",
    "KMSMasterKeyID": "arn:aws:kms:us-east-1:000000000000:key/ea1389a1-c213-4b2e-b8e1-7bf2d036e3c2"
}
--- main queue attrs:
{
    "KmsMasterKeyId": "8dbfa037-0ef7-4dfb-a71f-bb391bdc64cd",
    "VisibilityTimeout": "180",
    "RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:000000000000:ingest-dlq\",\"maxReceiveCount\":\"5\"}"
}
--- ESM:
{
    "State": "Enabled",
    "FnResp": [
        "ReportBatchItemFailures"
    ],
    "Queue": "arn:aws:sqs:us-east-1:000000000000:ingest-events"
}
--- dest bucket contents:
2026-04-22 08:44:59         15 processed/file with spaces.txt
2026-04-22 08:45:17         12 processed/test1.txt
--- DDB count:
2
--- DLQ depth:
"0"

Create KMS CMKs (3) + aliases
Create Lambda IAM role + least-privilege inline policies
Create DynamoDB table
Create DLQ + main SQS queue (SSE-KMS, redrive)
Create source + dest buckets with SSE-KMS default encryption
Wire S3 ObjectCreated -> SQS notification
Package + deploy Lambda with ReportBatchItemFailures
Create SQS->Lambda event source mapping
End-to-end test: normal key, key with spaces, partial batch failure, DLQ empty

Pipeline is up and all four acceptance conditions pass. **What's wired up:** - 3 separate CMKs (`alias/source-bucket-cmk`, `alias/sqs-queue-cmk`, `alias/dest-bucket-cmk`), each with a scoped policy: root admin, plus only the specific principals that need access (S3 service on the queue key so S3 can encrypt notifications; Lambda role scoped per-boundary , Decrypt on source, Decrypt+GenerateDataKey on queue, Encrypt+GenerateDataKey on dest). - Lambda role `image-ingest-lambda-role` has an inline policy with per-action/per-resource statements (no `Resource: *` anywhere except where the action is bound by its own resource like `logs:*` on the function's log group, and KMS actions scoped to each specific key ARN). - Queue `ingest-events`: SSE-KMS with `sqs-queue-cmk`, `VisibilityTimeout=180` (6× Lambda timeout of 30s), redrive to `ingest-dlq` at `maxReceiveCount=5`, and a resource policy allowing only the source bucket ARN to `sqs:SendMessage`. - Both buckets have default SSE-KMS encryption tied to their CMKs. - ESM has `FunctionResponseTypes=[ReportBatchItemFailures]`; handler returns `{"batchItemFailures": [...]}` and uses `urllib.parse.unquote_plus` to handle url-encoded keys (spaces etc.). **Verified:** - PUT → processed copy at `processed/<key>` + one DDB row, for both `test1.txt` and `file with spaces.txt`. - DLQ depth = 0. - Direct-invoke with a mixed batch: response was exactly `{"batchItemFailures":[{"itemIdentifier":"broken-msg-id"}]}` , the good record isn't retried.

Final diff , what the agent changed

No file changes, the agent left the workspace untouched.

Verifier output , the proof behind the reward

tests/test.sh

============================= test session starts ==============================
platform linux -- Python 3.12.3, pytest-8.4.1, pluggy-1.6.0 -- /root/.cache/uv/archive-v0/SVpk3-ItEL-WOq9WM2g-5/bin/python
cachedir: .pytest_cache
rootdir: /tests
plugins: json-ctrf-0.3.5
collecting ... collected 18 items

../tests/test_outputs.py::test_aws_cli_binary_is_real PASSED             [  5%]
../tests/test_outputs.py::test_localstack_reachable PASSED               [ 11%]
../tests/test_outputs.py::test_source_and_dest_buckets_use_customer_cmks PASSED [ 16%]
../tests/test_outputs.py::test_main_queue_and_dlq_exist_and_are_encrypted FAILED [ 22%]
../tests/test_outputs.py::test_lambda_exists_with_expected_handler PASSED [ 27%]
../tests/test_outputs.py::test_ddb_table_exists PASSED                   [ 33%]
../tests/test_outputs.py::test_source_bucket_notification_targets_main_queue PASSED [ 38%]
../tests/test_outputs.py::test_main_queue_policy_allows_s3_service FAILED [ 44%]
../tests/test_outputs.py::test_sqs_cmk_allows_s3_service PASSED          [ 50%]
../tests/test_outputs.py::test_source_cmk_allows_lambda_role_decrypt PASSED [ 55%]
../tests/test_outputs.py::test_dest_cmk_allows_lambda_role_encrypt PASSED [ 61%]
../tests/test_outputs.py::test_lambda_role_has_kms_decrypt_on_sqs_cmk PASSED [ 66%]
../tests/test_outputs.py::test_main_queue_visibility_timeout_covers_lambda_timeout PASSED [ 72%]
../tests/test_outputs.py::test_event_source_mapping_declares_report_batch_item_failures PASSED [ 77%]
../tests/test_outputs.py::test_lambda_handler_returns_correct_response_shape FAILED [ 83%]
../tests/test_outputs.py::test_end_to_end_preserves_object_size PASSED   [ 88%]
../tests/test_outputs.py::test_end_to_end_key_with_spaces_is_decoded PASSED [ 94%]
../tests/test_outputs.py::test_end_to_end_upload_propagates_to_dest_and_ddb PASSED [100%]

=================================== FAILURES ===================================
_______________ test_main_queue_and_dlq_exist_and_are_encrypted ________________

sqs = <botocore.client.SQS object at 0xffffa9c5c440>
kms = <botocore.client.KMS object at 0xffffa9cb12e0>

    def test_main_queue_and_dlq_exist_and_are_encrypted(sqs, kms):
        """Queues encrypted."""
        main_url = _queue_url(sqs, MAIN_QUEUE)
        main_attrs = _queue_attrs(sqs, main_url)
        assert main_attrs.get("KmsMasterKeyId"), (
            f"{MAIN_QUEUE} missing KmsMasterKeyId (SSE-KMS)"
        )
        expected = _resolve_key_id(kms, SQS_CMK_ALIAS)
        assert expected in main_attrs["KmsMasterKeyId"] or main_attrs[
            "KmsMasterKeyId"
        ].endswith(expected), (
            f"{MAIN_QUEUE} encrypted with {main_attrs['KmsMasterKeyId']}, "
            f"expected {SQS_CMK_ALIAS} ({expected})"
        )
    
        dlq_url = _queue_url(sqs, DLQ_QUEUE)
        dlq_attrs = _queue_attrs(sqs, dlq_url)
>       assert dlq_attrs.get("KmsMasterKeyId"), f"{DLQ_QUEUE} missing SSE-KMS"
E       AssertionError: ingest-dlq missing SSE-KMS
E       assert None
E        +  where None = <built-in method get of dict object at 0xffffa9c80e00>('KmsMasterKeyId')
E        +    where <built-in method get of dict object at 0xffffa9c80e00> = {'ApproximateNumberOfMessages': '0', 'ApproximateNumberOfMessagesDelayed': '0', 'ApproximateNumberOfMessagesNotVisible': '0', 'CreatedTimestamp': '1776847391', ...}.get

/tests/test_outputs.py:208: AssertionError
___________________ test_main_queue_policy_allows_s3_service ___________________

sqs = <botocore.client.SQS object at 0xffffa9c5c440>

    def test_main_queue_policy_allows_s3_service(sqs):
        """Queue policy allows S3."""
        url = _queue_url(sqs, MAIN_QUEUE)
        attrs = _queue_attrs(sqs, url, attrs=("Policy", "QueueArn"))
        policy_str = attrs.get("Policy")
        assert policy_str, (
            f"{MAIN_QUEUE} has no Policy attribute set. S3 cannot send "
            f"ObjectCreated events to a queue without a matching queue "
            f"policy allowing s3.amazonaws.com to sqs:SendMessage."
        )
>       policy = json.loads(policy_str)
                 ^^^^^^^^^^^^^^^^^^^^^^

/tests/test_outputs.py:267: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.12/json/__init__.py:346: in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <json.decoder.JSONDecoder object at 0xffffabca9850>
s = '{"Version":"2012-10-17","Id":"ingest-events-policy","Statement":[{"Sid":"AllowS3SourceBucketToSendMessage","Effect":"...uals":{"aws:SourceArn":"arn:aws:s3:::ingest-source-bucket"},"StringEquals":{"aws:SourceAccount":"000000000000"}}}]}\\n'
_w = <built-in method match of re.Pattern object at 0xffffab8fc930>

    def decode(self, s, _w=WHITESPACE.match):
        """Return the Python representation of ``s`` (a ``str`` instance
        containing a JSON document).
    
        """
        obj, end = self.raw_decode(s, idx=_w(s, 0).end())
        end = _w(s, end).end()
        if end != len(s):
>           raise JSONDecodeError("Extra data", s, end)
E           json.decoder.JSONDecodeError: Extra data: line 1 column 391 (char 390)

/usr/lib/python3.12/json/decoder.py:340: JSONDecodeError
______________ test_lambda_handler_returns_correct_response_shape ______________

lmb = <botocore.client.Lambda object at 0xffffabae3860>
sqs = <botocore.client.SQS object at 0xffffa9c5c440>
s3 = <botocore.client.S3 object at 0xffffa9f90ec0>

    def test_lambda_handler_returns_correct_response_shape(lmb, sqs, s3):
        """Partial batch response shape."""
        probe_key = f"probe/verifier-{uuid.uuid4().hex[:8]}.bin"
        s3.put_object(Bucket=SRC_BUCKET, Key=probe_key, Body=b"x" * 32)
    
        main_arn = _queue_attrs(
            sqs, _queue_url(sqs, MAIN_QUEUE), attrs=("QueueArn",)
        )["QueueArn"]
    
        good_body = {
            "Records": [
                {
                    "s3": {
                        "bucket": {"name": SRC_BUCKET},
                        "object": {"key": probe_key},
                    }
                }
            ]
        }
        bad_body = {"some-other-shape": "not-an-s3-event"}
    
        good_mid = "msg-good-" + uuid.uuid4().hex[:8]
        bad_mid = "msg-bad-" + uuid.uuid4().hex[:8]
        event = {
            "Records": [
                {
                    "messageId": good_mid,
                    "body": json.dumps(good_body),
                    "eventSource": "aws:sqs",
                    "eventSourceARN": main_arn,
                    "awsRegion": REGION,
                },
                {
                    "messageId": bad_mid,
                    "body": json.dumps(bad_body),
                    "eventSource": "aws:sqs",
                    "eventSourceARN": main_arn,
                    "awsRegion": REGION,
                },
            ]
        }
    
        resp = lmb.invoke(
            FunctionName=LAMBDA_FUNC,
            InvocationType="RequestResponse",
            Payload=json.dumps(event).encode(),
        )
        func_err = resp.get("FunctionError")
        payload = resp["Payload"].read()
        assert not func_err, (
            f"Lambda invocation raised FunctionError={func_err}. "
            f"Payload: {payload!r}"
        )
        result = json.loads(payload) if payload else None
        assert isinstance(result, dict), (
            f"Lambda returned non-object payload: {result!r}. Expected "
            f"{{'batchItemFailures': [...]}}."
        )
        assert "batchItemFailures" in result, (
            f"Lambda response is missing the required `batchItemFailures` "
            f"key. AWS silently ignores any other key (e.g. "
            f"`failedBatchItems`) when FunctionResponseTypes includes "
            f"ReportBatchItemFailures. Got: {result}"
        )
        failures = result["batchItemFailures"]
        assert isinstance(failures, list), (
            f"batchItemFailures must be a list; got {type(failures).__name__}"
        )
        ids = [f.get("itemIdentifier") for f in failures]
>       assert bad_mid in ids, (
            f"Expected the bad record {bad_mid} in batchItemFailures; "
            f"got ids={ids}. The handler must catch per-record exceptions "
            f"and return the failed messageIds."
        )
E       AssertionError: Expected the bad record msg-bad-64de4c4f in batchItemFailures; got ids=[]. The handler must catch per-record exceptions and return the failed messageIds.
E       assert 'msg-bad-64de4c4f' in []

/tests/test_outputs.py:522: AssertionError
=============================== warnings summary ===============================
test_outputs.py: 59 warnings
  /root/.cache/uv/archive-v0/SVpk3-ItEL-WOq9WM2g-5/lib/python3.12/site-packages/botocore/auth.py:424: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
    datetime_now = datetime.datetime.utcnow()

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
==================================== PASSES ====================================
=========================== short test summary info ============================
PASSED ../tests/test_outputs.py::test_aws_cli_binary_is_real
PASSED ../tests/test_outputs.py::test_localstack_reachable
PASSED ../tests/test_outputs.py::test_source_and_dest_buckets_use_customer_cmks
PASSED ../tests/test_outputs.py::test_lambda_exists_with_expected_handler
PASSED ../tests/test_outputs.py::test_ddb_table_exists
PASSED ../tests/test_outputs.py::test_source_bucket_notification_targets_main_queue
PASSED ../tests/test_outputs.py::test_sqs_cmk_allows_s3_service
PASSED ../tests/test_outputs.py::test_source_cmk_allows_lambda_role_decrypt
PASSED ../tests/test_outputs.py::test_dest_cmk_allows_lambda_role_encrypt
PASSED ../tests/test_outputs.py::test_lambda_role_has_kms_decrypt_on_sqs_cmk
PASSED ../tests/test_outputs.py::test_main_queue_visibility_timeout_covers_lambda_timeout
PASSED ../tests/test_outputs.py::test_event_source_mapping_declares_report_batch_item_failures
PASSED ../tests/test_outputs.py::test_end_to_end_preserves_object_size
PASSED ../tests/test_outputs.py::test_end_to_end_key_with_spaces_is_decoded
PASSED ../tests/test_outputs.py::test_end_to_end_upload_propagates_to_dest_and_ddb
FAILED ../tests/test_outputs.py::test_main_queue_and_dlq_exist_and_are_encrypted
FAILED ../tests/test_outputs.py::test_main_queue_policy_allows_s3_service - j...
FAILED ../tests/test_outputs.py::test_lambda_handler_returns_correct_response_shape
================== 3 failed, 15 passed, 59 warnings in 10.75s ==================

Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_a7aa148352ff4136. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.

Trial trial_a7aa148352ff4136 · verifier authoritative; classifier explanatory.