SyncValsverifier → artifact → classifier → verdict
SyncVals · Trajectory

apigw-sqs-fifo-direct-integration

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.
SubtypeIncomplete Understanding
EvidenceTest `test_stage_deployment_id_was_refreshed` failed with: "stage dev has only 1 deployment(s); editing an integration without calling create-deployment is the #1 silent failure mode for this task". All 18 other tests passed, including critical end-to-end tests (test_end_to_end_post_reaches_ddb_no_dlq, test_end_to_end_duplicate_post_is_idempotent, test_end_to_end_fifo_group_ordering). The agent successfully built the full infrastructure (queues, DDB, Lambda, ESM, API Gateway integration) but forgot to call `apigateway create-deployment` after configuring the integration.
Root causeThe instruction explicitly stated multiple times that 'after every wiring change, call apigateway create-deployment against this rest-api targeting stage dev , once at the very end, once after a fix, every time' and emphasized this is 'the single most common reason an otherwise-correct setup still looks broken'. The agent missed this critical requirement and failed to redeploy the API Gateway stage after configuring the integration, even though the test itself flagged this as the #1 failure mode for this task.
RecommendationN/A - task is fine. The instruction clearly emphasizes the deployment requirement multiple times. The agent simply failed to follow an explicit, well-documented requirement despite it being called out as the primary pitfall for this task.
Trajectory
Tool-by-tool agent trajectory
28 tool calls · 4 tool types · 31 steps
ok so we need an order-ingest pipeline on localstack. localstack is at `http://localstack:4566`, creds are already exported (`AWS_ACCESS_KEY_ID=test`, same for secret, region `us-east-1`), you've got `aws`, `python3`, `boto3`, `jq`, `zip`, `curl`. build the whole thing. a seeder (`/app/setup.sh`, already ran) has pre-created the consumer Lambda (`orders-consumer`) and its role (`orders-consumer-role`) , **both broken by design**. the handler has the wrong batch-failure response shape and isn't idempotent, and the role is missing the AWS actions it actually needs to do its job. you fix those. everything else is up to you to build from scratch: - the rest api + stage + resource + method + integration + deployment - the apigw→sqs iam role - the two fifo queues (main + dlq) with redrive - the ddb table - the event source mapping from the main queue to the pre-seeded lambda IAM policies too , every role needs whatever actions its job requires. merchants POST orders to a rest api. the api drops the order onto a fifo queue, a consumer lambda drains the queue into dynamodb, and anything that keeps failing lands in a dlq. duplicate POSTs for the same order must be no-ops at the storage layer , second POST succeeds http-wise but the stored row doesn't change. done looks like this: one `POST /dev/orders` from inside the compose network with body `{"order_id":..., "merchant_id":..., "amount":...}` and within ~30s: - http 200 back - exactly one row in the `orders` table keyed by `order_id`, carrying merchant_id and amount - nothing in the dlq - re-POST the same body → still 200, still one row, unchanged - two different order_ids under the same merchant preserve posted order in the table timestamps shape of it: - rest api, stage `dev`, resource `/orders`, method `POST`. integration is a direct aws-service call to sqs , not AWS_PROXY, not a lambda proxy. api gateway assumes a role and hands the message straight to the queue. - the queue is fifo. content-based dedup off. a separate fifo dlq is wired via redrive. - a lambda consumes the queue via an event source mapping, writes to ddb, and reports per-record failures so a single bad record doesn't retry the whole batch. - ddb table `orders`, partition key `order_id` (String). also: api gateway is two-layer , there's the CONFIGURATION (resources, methods, integration, role, mapping templates) and there's the live STAGE that clients actually hit. editing configuration in place doesn't promote anything; clients keep seeing the old behavior until you create a NEW deployment for the stage. so after every wiring change, call `apigateway create-deployment` against this rest-api targeting stage `dev` , once at the very end, once after a fix, every time. forgetting this is the single most common reason an otherwise-correct setup still looks broken. names the verifier grabs by hand, use them exactly: | thing | name | |-|-| | rest api | `orders-api` | | stage | `dev` | | resource path | `/orders` | | method | `POST` | | main queue | `orders.fifo` | | dlq | `orders-dlq.fifo` | | apigw→sqs role | `apigw-to-sqs-role` | | consumer lambda | `orders-consumer` | | consumer lambda role | `orders-consumer-role` | | ddb table | `orders` (pk `order_id` String) | python3.11 for the lambda. the lambda runs on the shared compose network so `http://localstack:4566` is reachable from inside it. localstack community 4.13.1. you have up to 60 minutes.

List app directory and view setup script

shell
ls /app/ && cat /app/setup.sh 2>/dev/null | head -100
output
setup.sh
starter
#!/bin/bash
[redacted: decontamination sentinel]
[redacted: decontamination sentinel]
#
# Pre-seeds the consumer Lambda + its role with a broken-by-design
# handler and incomplete IAM. The agent has to build everything else
# (queues, DDB, apigw, integration, deployment, ESM) AND fix this
# Lambda's handler + role. Without the pre-seeded Lambda, Opus 4.7
# tends to read the prose and forget the consumer path entirely.

set -euo pipefail

REGION="${AWS_DEFAULT_REGION:-us-east-1}"
ACCOUNT_ID="000000000000"

LAMBDA_FUNC="orders-consumer"
LAMBDA_ROLE="orders-consumer-role"

log() { echo "[setup] $*" >&2; }

log "waiting for localstack"
for _ in $(seq 1 80); do
  HEALTH=$(curl -sf http://localstack:4566/_localstack/health || true)
  echo "$HEALTH" | grep -qE '"lambda": "(available|running)"' \
    && echo "$HEALTH" | grep -qE '"iam": "(available|running)"' \
    && break
  sleep 2
done

log "creating Lambda consumer role (deliberately incomplete)"
TRUST=$(cat <<'JSON'
{
  "Version": "2012-10-17",
  "Statement": [
    {"Effect": "Allow", "Principal": {"Service": "lambda.amazonaws.com"}, "Action": "sts:AssumeRole"}
  ]
}
JSON
)
aws iam create-role \
  --role-name "$LAMBDA_ROLE" \
  --assume-role-policy-document "$TRUST" >/dev/null
aws iam attach-role-policy \
  --role-name "$LAMBDA_ROLE" \
  --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
# Note: no dynamodb:PutItem, no sqs perms. Agent fixes this.
ROLE_ARN=$(aws iam get-role --role-name "$LAMBDA_ROLE" --query 'Role.Arn' --output text)

log "packaging Lambda (broken-by-design inline handler)"
WORKDIR="$(mktemp -d)"
cat > "${WORKDIR}/handler.py" <<'PY'
"""Orders consumer - broken by design.

Known issues (agent must fix):
  - Not idempotent: a duplicate message will try to PutItem again,
    which will either overwrite (wrong) or fail (wrong shape).
  - Returns a per-record 'failed' list instead of the AWS-required
    batchItemFailures shape for partial-batch-failure reporting.
"""

import json
import os
import time
import boto3

_endpoint = os.environ.get("AWS_ENDPOINT_URL", "http://localstack:4566")
ddb = boto3.client("dynamodb", endpoint_url=_endpoint)

TABLE_NAME = os.environ.get("TABLE_NAME", "orders")


def _process_record(record):
    payload = json.loads(record["body"])
    order_id = payload["order_id"]
    merchant_id = payload["merchant_id"]
    amount = int(payload["amount"])

    ddb.put_item(
        TableName=TABLE_NAME,
        Item={
            "order_id": {"S": order_id},
            "merchant_id": {"S": merchant_id},
            "amount": {"N": str(amount)},
            "created_at": {"N": str(int(time.time()))},
        },
    )


def lambda_handler(event, context):
    failed = []
    for record in event.get("Records", []):
        try:
            _process_record(record)
        except Exception as e:
            print(f"[error] msgId={record.get('messageId')} {type(e).__name__}: {e}")
            failed.append({"itemIdentifier": record["messageId"]})

    return {"failed": failed}
PY
(cd "$WORKDIR" && zip -q handler.zip handler.py)

[stdout]
setup.sh
starter
#!/bin/bash
[redacted: decontamination sentinel]
[redacted: decontamination sentinel]
#
# Pre-seeds the consumer Lambda + its role with a broken-by-design
# handler and incomplete IAM. The agent has to build everything else
# (queues, DDB, apigw, integration, deployment, ESM) AND fix this
# Lambda's handler + role. Without the pre-seeded Lambda, Opus 4.7
# tends to read the prose and forget the consumer path entirely.

set -euo pipefail

REGION="${AWS_DEFAULT_REGION:-us-east-1}"
ACCOUNT_ID="000000000000"

LAMBDA_FUNC="orders-consumer"
LAMBDA_ROLE="orders-consumer-role"

log() { echo "[setup] $*" >&2; }

log "waiting for localstack"
for _ in $(seq 1 80); do
  HEALTH=$(curl -sf http://localstack:4566/_localstack/health || true)
  echo "$HEALTH" | grep -qE '"lambda": "(available|running)"' \
    && echo "$HEALTH" | grep -qE '"iam": "(available|running)"' \
    && break
  sleep 2
done

log "creating Lambda consumer role (deliberately incomplete)"
TRUST=$(cat <<'JSON'
{
  "Version": "2012-10-17",
  "Statement": [
    {"Effect": "Allow", "Principal": {"Service": "lambda.amazonaws.com"}, "Action": "sts:AssumeRole"}
  ]
}
JSON
)
aws iam create-role \
  --role-name "$LAMBDA_ROLE" \
  --assume-role-policy-document "$TRUST" >/dev/null
aws iam attach-role-policy \
  --role-name "$LAMBDA_ROLE" \
  --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
# Note: no dynamodb:PutItem, no sqs perms. Agent fixes this.
ROLE_ARN=$(aws iam get-role --role-name "$LAMBDA_ROLE" --query 'Role.Arn' --output text)

log "packaging Lambda (broken-by-design inline handler)"
WORKDIR="$(mktemp -d)"
cat > "${WORKDIR}/handler.py" <<'PY'
"""Orders consumer - broken by design.

Known issues (agent must fix):
  - Not idempotent: a duplicate message will try to PutItem again,
    which will either overwrite (wrong) or fail (wrong shape).
  - Returns a per-record 'failed' list instead of the AWS-required
    batchItemFailures shape for partial-batch-failure reporting.
"""

import json
import os
import time
import boto3

_endpoint = os.environ.get("AWS_ENDPOINT_URL", "http://localstack:4566")
ddb = boto3.client("dynamodb", endpoint_url=_endpoint)

TABLE_NAME = os.environ.get("TABLE_NAME", "orders")


def _process_record(record):
    payload = json.loads(record["body"])
    order_id = payload["order_id"]
    merchant_id = payload["merchant_id"]
    amount = int(payload["amount"])

    ddb.put_item(
        TableName=TABLE_NAME,
        Item={
            "order_id": {"S": order_id},
            "merchant_id": {"S": merchant_id},
            "amount": {"N": str(amount)},
            "created_at": {"N": str(int(time.time()))},
        },
    )


def lambda_handler(event, context):
    failed = []
    for record in event.get("Records", []):
        try:
            _process_record(record)
        except Exception as e:
            print(f"[error] msgId={record.get('messageId')} {type(e).__name__}: {e}")
            failed.append({"itemIdentifier": record["messageId"]})

    return {"failed": failed}
PY
(cd "$WORKDIR" && zip -q handler.zip handler.py)

View rest of setup script

shell
cat /app/setup.sh | tail -100
output
for _ in $(seq 1 80); do
  HEALTH=$(curl -sf http://localstack:4566/_localstack/health || true)
  echo "$HEALTH" | grep -qE '"lambda": "(available|running)"' \
    && echo "$HEALTH" | grep -qE '"iam": "(available|running)"' \
    && break
  sleep 2
done

log "creating Lambda consumer role (deliberately incomplete)"
TRUST=$(cat <<'JSON'
{
  "Version": "2012-10-17",
  "Statement": [
    {"Effect": "Allow", "Principal": {"Service": "lambda.amazonaws.com"}, "Action": "sts:AssumeRole"}
  ]
}
JSON
)
aws iam create-role \
  --role-name "$LAMBDA_ROLE" \
  --assume-role-policy-document "$TRUST" >/dev/null
aws iam attach-role-policy \
  --role-name "$LAMBDA_ROLE" \
  --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
# Note: no dynamodb:PutItem, no sqs perms. Agent fixes this.
ROLE_ARN=$(aws iam get-role --role-name "$LAMBDA_ROLE" --query 'Role.Arn' --output text)

log "packaging Lambda (broken-by-design inline handler)"
WORKDIR="$(mktemp -d)"
cat > "${WORKDIR}/handler.py" <<'PY'
"""Orders consumer - broken by design.

Known issues (agent must fix):
  - Not idempotent: a duplicate message will try to PutItem again,
    which will either overwrite (wrong) or fail (wrong shape).
  - Returns a per-record 'failed' list instead of the AWS-required
    batchItemFailures shape for partial-batch-failure reporting.
"""

import json
import os
import time
import boto3

_endpoint = os.environ.get("AWS_ENDPOINT_URL", "http://localstack:4566")
ddb = boto3.client("dynamodb", endpoint_url=_endpoint)

TABLE_NAME = os.environ.get("TABLE_NAME", "orders")


def _process_record(record):
    payload = json.loads(record["body"])
    order_id = payload["order_id"]
    merchant_id = payload["merchant_id"]
    amount = int(payload["amount"])

    ddb.put_item(
        TableName=TABLE_NAME,
        Item={
            "order_id": {"S": order_id},
            "merchant_id": {"S": merchant_id},
            "amount": {"N": str(amount)},
            "created_at": {"N": str(int(time.time()))},
        },
    )


def lambda_handler(event, context):
    failed = []
    for record in event.get("Records", []):
        try:
            _process_record(record)
        except Exception as e:
            print(f"[error] msgId={record.get('messageId')} {type(e).__name__}: {e}")
            failed.append({"itemIdentifier": record["messageId"]})

    return {"failed": failed}
PY
(cd "$WORKDIR" && zip -q handler.zip handler.py)

log "creating Lambda function"
aws lambda create-function \
  --function-name "$LAMBDA_FUNC" \
  --runtime python3.11 \
  --role "$ROLE_ARN" \
  --handler handler.lambda_handler \
  --timeout 30 \
  --memory-size 512 \
  --environment "Variables={AWS_ENDPOINT_URL=http://localstack:4566,TABLE_NAME=orders}" \
  --zip-file "fileb://${WORKDIR}/handler.zip" >/dev/null

for _ in $(seq 1 30); do
  STATE=$(aws lambda get-function --function-name "$LAMBDA_FUNC" \
    --query 'Configuration.State' --output text 2>/dev/null || echo "Pending")
  [ "$STATE" = "Active" ] && break
  sleep 1
done
log "Lambda $LAMBDA_FUNC ready"

log "done"

[stdout]
for _ in $(seq 1 80); do
  HEALTH=$(curl -sf http://localstack:4566/_localstack/health || true)
  echo "$HEALTH" | grep -qE '"lambda": "(available|running)"' \
    && echo "$HEALTH" | grep -qE '"iam": "(available|running)"' \
    && break
  sleep 2
done

log "creating Lambda consumer role (deliberately incomplete)"
TRUST=$(cat <<'JSON'
{
  "Version": "2012-10-17",
  "Statement": [
    {"Effect": "Allow", "Principal": {"Service": "lambda.amazonaws.com"}, "Action": "sts:AssumeRole"}
  ]
}
JSON
)
aws iam create-role \
  --role-name "$LAMBDA_ROLE" \
  --assume-role-policy-document "$TRUST" >/dev/null
aws iam attach-role-policy \
  --role-name "$LAMBDA_ROLE" \
  --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
# Note: no dynamodb:PutItem, no sqs perms. Agent fixes this.
ROLE_ARN=$(aws iam get-role --role-name "$LAMBDA_ROLE" --query 'Role.Arn' --output text)

log "packaging Lambda (broken-by-design inline handler)"
WORKDIR="$(mktemp -d)"
cat > "${WORKDIR}/handler.py" <<'PY'
"""Orders consumer - broken by design.

Known issues (agent must fix):
  - Not idempotent: a duplicate message will try to PutItem again,
    which will either overwrite (wrong) or fail (wrong shape).
  - Returns a per-record 'failed' list instead of the AWS-required
    batchItemFailures shape for partial-batch-failure reporting.
"""

import json
import os
import time
import boto3

_endpoint = os.environ.get("AWS_ENDPOINT_URL", "http://localstack:4566")
ddb = boto3.client("dynamodb", endpoint_url=_endpoint)

TABLE_NAME = os.environ.get("TABLE_NAME", "orders")


def _process_record(record):
    payload = json.loads(record["body"])
    order_id = payload["order_id"]
    merchant_id = payload["merchant_id"]
    amount = int(payload["amount"])

    ddb.put_item(
        TableName=TABLE_NAME,
        Item={
            "order_id": {"S": order_id},
            "merchant_id": {"S": merchant_id},
            "amount": {"N": str(amount)},
            "created_at": {"N": str(int(time.time()))},
        },
    )


def lambda_handler(event, context):
    failed = []
    for record in event.get("Records", []):
        try:
            _process_record(record)
        except Exception as e:
            print(f"[error] msgId={record.get('messageId')} {type(e).__name__}: {e}")
            failed.append({"itemIdentifier": record["messageId"]})

    return {"failed": failed}
PY
(cd "$WORKDIR" && zip -q handler.zip handler.py)

log "creating Lambda function"
aws lambda create-function \
  --function-name "$LAMBDA_FUNC" \
  --runtime python3.11 \
  --role "$ROLE_ARN" \
  --handler handler.lambda_handler \
  --timeout 30 \
  --memory-size 512 \
  --environment "Variables={AWS_ENDPOINT_URL=http://localstack:4566,TABLE_NAME=orders}" \
  --zip-file "fileb://${WORKDIR}/handler.zip" >/dev/null

for _ in $(seq 1 30); do
  STATE=$(aws lambda get-function --function-name "$LAMBDA_FUNC" \
    --query 'Configuration.State' --output text 2>/dev/null || echo "Pending")
  [ "$STATE" = "Active" ] && break
  sleep 1
done
log "Lambda $LAMBDA_FUNC ready"

log "done"

Check starter dir and env

shell
ls /app/starter/ 2>/dev/null && echo "---" && env | grep -E "AWS|ENDPOINT"
output
setup.sh
---
AWS_DEFAULT_REGION=us-east-1
AWS_PAGER=
AWS_SECRET_ACCESS_KEY=test
AWS_ACCESS_KEY_ID=test
AWS_ENDPOINT_URL=http://localstack:4566

[stdout]
setup.sh
---
AWS_DEFAULT_REGION=us-east-1
AWS_PAGER=
AWS_SECRET_ACCESS_KEY=test
AWS_ACCESS_KEY_ID=test
AWS_ENDPOINT_URL=http://localstack:4566

Check existing lambda and role state

shell
aws lambda get-function --function-name orders-consumer --query 'Configuration.{State:State,Role:Role,Runtime:Runtime,Handler:Handler}' && echo "---" && aws iam list-attached-role-policies --role-name orders-consumer-role && echo "---" && aws iam list-role-policies --role-name orders-consumer-role
output
{
    "State": "Active",
    "Role": "arn:aws:iam::000000000000:role/orders-consumer-role",
    "Runtime": "python3.11",
    "Handler": "handler.lambda_handler"
}
---
{
    "AttachedPolicies": [
        {
            "PolicyName": "AWSLambdaBasicExecutionRole",
            "PolicyArn": "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
        }
    ]
}
---
{
    "PolicyNames": []
}

[stdout]
{
    "State": "Active",
    "Role": "arn:aws:iam::000000000000:role/orders-consumer-role",
    "Runtime": "python3.11",
    "Handler": "handler.lambda_handler"
}
---
{
    "AttachedPolicies": [
        {
            "PolicyName": "AWSLambdaBasicExecutionRole",
            "PolicyArn": "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
        }
    ]
}
---
{
    "PolicyNames": []
}
Got it. Let me check the current state of resources, then build. Starting with the Lambda fixes and infrastructure in parallel.

Add SQS + DDB permissions to consumer role

shell
aws iam put-role-policy --role-name orders-consumer-role --policy-name orders-consumer-inline --policy-document '{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "sqs:ReceiveMessage",
        "sqs:DeleteMessage",
        "sqs:GetQueueAttributes",
        "sqs:ChangeMessageVisibility"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "dynamodb:PutItem",
        "dynamodb:GetItem",
        "dynamodb:UpdateItem"
      ],
      "Resource": "*"
    }
  ]
}' && echo "lambda role policy attached"
output
lambda role policy attached

[stdout]
lambda role policy attached

Create orders DDB table

shell
aws dynamodb create-table \
  --table-name orders \
  --attribute-definitions AttributeName=order_id,AttributeType=S \
  --key-schema AttributeName=order_id,KeyType=HASH \
  --billing-mode PAY_PER_REQUEST \
  --query 'TableDescription.TableStatus' --output text
output
ACTIVE

[stdout]
ACTIVE

Create FIFO DLQ

shell
aws sqs create-queue --queue-name orders-dlq.fifo \
  --attributes FifoQueue=true,ContentBasedDeduplication=false \
  --query 'QueueUrl' --output text
output
http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders-dlq.fifo

[stdout]
http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders-dlq.fifo

Create main FIFO queue with redrive

shell
DLQ_ARN=$(aws sqs get-queue-attributes \
  --queue-url http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders-dlq.fifo \
  --attribute-names QueueArn --query 'Attributes.QueueArn' --output text)
echo "DLQ_ARN=$DLQ_ARN"

REDRIVE=$(jq -nc --arg arn "$DLQ_ARN" '{deadLetterTargetArn:$arn, maxReceiveCount:"5"}')
echo "REDRIVE=$REDRIVE"

aws sqs create-queue --queue-name orders.fifo \
  --attributes "FifoQueue=true,ContentBasedDeduplication=false,RedrivePolicy=$REDRIVE,VisibilityTimeout=60" \
  --query 'QueueUrl' --output text
output
Exit code 252
DLQ_ARN=arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo
REDRIVE={"deadLetterTargetArn":"arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo","maxReceiveCount":"5"}

aws: [ERROR]: An error occurred (ParamValidation): Error parsing parameter '--attributes': Expected: '=', received: '"' for input:
 FifoQueue=true,ContentBasedDeduplication=false,RedrivePolicy={"deadLetterTargetArn":"arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo","maxReceiveCount":"5"},VisibilityTimeout=60
                                                              ^

[error] tool reported failure

Create main FIFO queue via file

shell
cat > /tmp/main-queue-attrs.json <<'EOF'
{
  "FifoQueue": "true",
  "ContentBasedDeduplication": "false",
  "VisibilityTimeout": "60",
  "RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo\",\"maxReceiveCount\":\"5\"}"
}
EOF
aws sqs create-queue --queue-name orders.fifo \
  --attributes file:///tmp/main-queue-attrs.json \
  --query 'QueueUrl' --output text
output
http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders.fifo

[stdout]
http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders.fifo
ToolSearch
{
  "query": "select:TodoWrite",
  "max_results": 1
}

, output, 
{"type": "tool_reference", "tool_name": "TodoWrite"}
  • Add SQS+DDB perms to consumer role
  • Create DDB orders table
  • Create FIFO DLQ
  • Create main FIFO queue with redrive
  • Fix Lambda handler (idempotent + correct shape) and update code
  • Create event source mapping with ReportBatchItemFailures
  • Create apigw-to-sqs role with sqs:SendMessage
  • Create REST API + /orders + POST + AWS-service SQS integration
  • Create deployment for stage dev
  • End-to-end test (single + duplicate + ordering)
write · /tmp/lambda/handler.py
import json
import os
import time
import boto3
from botocore.exceptions import ClientError

_endpoint = os.environ.get("AWS_ENDPOINT_URL", "http://localstack:4566")
ddb = boto3.client("dynamodb", endpoint_url=_endpoint)

TABLE_NAME = os.environ.get("TABLE_NAME", "orders")


def _process_record(record):
    payload = json.loads(record["body"])
    order_id = payload["order_id"]
    merchant_id = payload["merchant_id"]
    amount = int(payload["amount"])

    try:
        ddb.put_item(
            TableName=TABLE_NAME,
            Item={
                "order_id": {"S": order_id},
                "merchant_id": {"S": merchant_id},
                "amount": {"N": str(amount)},
                "created_at": {"N": str(int(time.time()))},
            },
            ConditionExpression="attribute_not_exists(order_id)",
        )
    except ClientError as e:
        if e.response["Error"]["Code"] == "ConditionalCheckFailedException":
            return
        raise


def lambda_handler(event, context):
    batch_item_failures = []
    for record in event.get("Records", []):
        try:
            _process_record(record)
        except Exception as e:
            print(f"[error] msgId={record.get('messageId')} {type(e).__name__}: {e}")
            batch_item_failures.append({"itemIdentifier": record["messageId"]})

    return {"batchItemFailures": batch_item_failures}

Repackage and upload Lambda code

shell
cd /tmp/lambda && zip -q handler.zip handler.py && \
aws lambda update-function-code \
  --function-name orders-consumer \
  --zip-file fileb:///tmp/lambda/handler.zip \
  --query 'LastUpdateStatus' --output text
output
InProgress
Shell cwd was reset to /app

[stdout]
InProgress
[stderr]

Shell cwd was reset to /app

Wait for lambda update to finish

shell
for _ in $(seq 1 30); do
  ST=$(aws lambda get-function --function-name orders-consumer --query 'Configuration.LastUpdateStatus' --output text 2>/dev/null)
  [ "$ST" = "Successful" ] && echo "READY" && break
  sleep 1
done
aws lambda get-function --function-name orders-consumer --query 'Configuration.{State:State,LastUpdateStatus:LastUpdateStatus}'
output
READY
{
    "State": "Active",
    "LastUpdateStatus": "Successful"
}

[stdout]
READY
{
    "State": "Active",
    "LastUpdateStatus": "Successful"
}

Create event source mapping

shell
QUEUE_ARN=$(aws sqs get-queue-attributes \
  --queue-url http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders.fifo \
  --attribute-names QueueArn --query 'Attributes.QueueArn' --output text)
echo "QUEUE_ARN=$QUEUE_ARN"

aws lambda create-event-source-mapping \
  --function-name orders-consumer \
  --event-source-arn "$QUEUE_ARN" \
  --batch-size 10 \
  --function-response-types ReportBatchItemFailures \
  --query '{UUID:UUID,State:State,FunctionResponseTypes:FunctionResponseTypes}'
output
QUEUE_ARN=arn:aws:sqs:us-east-1:000000000000:orders.fifo
{
    "UUID": "47427d3f-8677-49e7-baea-e43055e2c7fb",
    "State": "Creating",
    "FunctionResponseTypes": [
        "ReportBatchItemFailures"
    ]
}

[stdout]
QUEUE_ARN=arn:aws:sqs:us-east-1:000000000000:orders.fifo
{
    "UUID": "47427d3f-8677-49e7-baea-e43055e2c7fb",
    "State": "Creating",
    "FunctionResponseTypes": [
        "ReportBatchItemFailures"
    ]
}

Create apigw-to-sqs role with policy

shell
aws iam create-role --role-name apigw-to-sqs-role \
  --assume-role-policy-document '{
    "Version":"2012-10-17",
    "Statement":[{"Effect":"Allow","Principal":{"Service":"apigateway.amazonaws.com"},"Action":"sts:AssumeRole"}]
  }' --query 'Role.Arn' --output text

aws iam put-role-policy --role-name apigw-to-sqs-role \
  --policy-name apigw-to-sqs-inline \
  --policy-document '{
    "Version":"2012-10-17",
    "Statement":[{"Effect":"Allow","Action":["sqs:SendMessage","sqs:GetQueueUrl","sqs:GetQueueAttributes"],"Resource":"arn:aws:sqs:us-east-1:000000000000:orders.fifo"}]
  }' && echo "apigw role done"
output
arn:aws:iam::000000000000:role/apigw-to-sqs-role
apigw role done

[stdout]
arn:aws:iam::000000000000:role/apigw-to-sqs-role
apigw role done

Create REST API and /orders resource

shell
API_ID=$(aws apigateway create-rest-api --name orders-api --query 'id' --output text)
echo "API_ID=$API_ID"
ROOT_ID=$(aws apigateway get-resources --rest-api-id "$API_ID" --query 'items[0].id' --output text)
echo "ROOT_ID=$ROOT_ID"
ORDERS_ID=$(aws apigateway create-resource --rest-api-id "$API_ID" --parent-id "$ROOT_ID" --path-part orders --query 'id' --output text)
echo "ORDERS_ID=$ORDERS_ID"
echo "$API_ID" > /tmp/api_id
echo "$ORDERS_ID" > /tmp/orders_id
output
API_ID=k8psjitntm
ROOT_ID=zhg0qcazh9
ORDERS_ID=hjqzpbkdou

[stdout]
API_ID=k8psjitntm
ROOT_ID=zhg0qcazh9
ORDERS_ID=hjqzpbkdou

Create POST method on /orders

shell
API_ID=$(cat /tmp/api_id)
ORDERS_ID=$(cat /tmp/orders_id)

aws apigateway put-method \
  --rest-api-id "$API_ID" \
  --resource-id "$ORDERS_ID" \
  --http-method POST \
  --authorization-type NONE \
  --query 'httpMethod' --output text
output
POST

[stdout]
POST
write · /tmp/req-template.json
{
  "application/json": "Action=SendMessage&MessageBody=$util.urlEncode($input.body)&MessageGroupId=$util.urlEncode($input.path('$.merchant_id'))&MessageDeduplicationId=$util.urlEncode($input.path('$.order_id'))"
}

Configure AWS-service SQS integration

shell
API_ID=$(cat /tmp/api_id)
ORDERS_ID=$(cat /tmp/orders_id)

aws apigateway put-integration \
  --rest-api-id "$API_ID" \
  --resource-id "$ORDERS_ID" \
  --http-method POST \
  --type AWS \
  --integration-http-method POST \
  --uri "arn:aws:apigateway:us-east-1:sqs:path/000000000000/orders.fifo" \
  --credentials "arn:aws:iam::000000000000:role/apigw-to-sqs-role" \
  --request-parameters '{"integration.request.header.Content-Type":"'"'"'application/x-www-form-urlencoded'"'"'"}' \
  --request-templates file:///tmp/req-template.json \
  --passthrough-behavior NEVER \
  --query 'type' --output text
output
AWS

[stdout]
AWS

Set up method+integration response 200

shell
API_ID=$(cat /tmp/api_id)
ORDERS_ID=$(cat /tmp/orders_id)

aws apigateway put-method-response \
  --rest-api-id "$API_ID" \
  --resource-id "$ORDERS_ID" \
  --http-method POST \
  --status-code 200 \
  --response-models '{"application/json":"Empty"}' \
  --query 'statusCode' --output text

aws apigateway put-integration-response \
  --rest-api-id "$API_ID" \
  --resource-id "$ORDERS_ID" \
  --http-method POST \
  --status-code 200 \
  --selection-pattern "" \
  --response-templates '{"application/json":"{\"status\":\"queued\"}"}' \
  --query 'statusCode' --output text
output
200
200

[stdout]
200
200
  • Add SQS+DDB perms to consumer role
  • Create DDB orders table
  • Create FIFO DLQ
  • Create main FIFO queue with redrive
  • Fix Lambda handler (idempotent + correct shape) and update code
  • Create event source mapping with ReportBatchItemFailures
  • Create apigw-to-sqs role with sqs:SendMessage
  • Create REST API + /orders + POST + AWS-service SQS integration
  • Create deployment for stage dev
  • End-to-end test (single + duplicate + ordering)

Create deployment to stage dev

shell
API_ID=$(cat /tmp/api_id)
aws apigateway create-deployment \
  --rest-api-id "$API_ID" \
  --stage-name dev \
  --query '{id:id,createdDate:createdDate}'
output
{
    "id": "opbqhnlvwd",
    "createdDate": "2026-04-28T14:13:07+00:00"
}

[stdout]
{
    "id": "opbqhnlvwd",
    "createdDate": "2026-04-28T14:13:07+00:00"
}

Wait for ESM and POST first order

shell
API_ID=$(cat /tmp/api_id)
ESM_STATE=$(aws lambda list-event-source-mappings --function-name orders-consumer \
  --query 'EventSourceMappings[0].State' --output text)
echo "ESM_STATE=$ESM_STATE"

# Wait for ESM to be Enabled
for _ in $(seq 1 30); do
  ESM_STATE=$(aws lambda list-event-source-mappings --function-name orders-consumer \
    --query 'EventSourceMappings[0].State' --output text)
  [ "$ESM_STATE" = "Enabled" ] && echo "ESM ENABLED" && break
  sleep 1
done

# Now run end-to-end test from inside the compose network (we are inside it)
URL="http://localstack:4566/restapis/${API_ID}/dev/_user_request_/orders"
echo "URL=$URL"

# First POST
curl -s -o /tmp/r1 -w "HTTP=%{http_code}\n" -X POST "$URL" \
  -H "Content-Type: application/json" \
  -d '{"order_id":"o-1","merchant_id":"m-1","amount":100}'
cat /tmp/r1; echo
output
ESM_STATE=Enabled
ESM ENABLED
URL=http://localstack:4566/restapis/k8psjitntm/dev/_user_request_/orders
HTTP=200
{"status":"queued"}

[stdout]
ESM_STATE=Enabled
ESM ENABLED
URL=http://localstack:4566/restapis/k8psjitntm/dev/_user_request_/orders
HTTP=200
{"status":"queued"}

Check DDB after first POST

shell
sleep 5
aws dynamodb scan --table-name orders --query 'Items'
output
[
    {
        "created_at": {
            "N": "1777385603"
        },
        "amount": {
            "N": "100"
        },
        "merchant_id": {
            "S": "m-1"
        },
        "order_id": {
            "S": "o-1"
        }
    }
]

[stdout]
[
    {
        "created_at": {
            "N": "1777385603"
        },
        "amount": {
            "N": "100"
        },
        "merchant_id": {
            "S": "m-1"
        },
        "order_id": {
            "S": "o-1"
        }
    }
]

Test dup POST and second order POST

shell
API_ID=$(cat /tmp/api_id)
URL="http://localstack:4566/restapis/${API_ID}/dev/_user_request_/orders"

# Duplicate POST
curl -s -o /tmp/r2 -w "HTTP_DUP=%{http_code}\n" -X POST "$URL" \
  -H "Content-Type: application/json" \
  -d '{"order_id":"o-1","merchant_id":"m-1","amount":100}'
cat /tmp/r2; echo

sleep 5
echo "---DDB after dup---"
aws dynamodb scan --table-name orders --query 'Items'

# Second different order from same merchant
curl -s -o /tmp/r3 -w "HTTP_NEW=%{http_code}\n" -X POST "$URL" \
  -H "Content-Type: application/json" \
  -d '{"order_id":"o-2","merchant_id":"m-1","amount":250}'
cat /tmp/r3; echo

sleep 5
echo "---DDB after second order---"
aws dynamodb scan --table-name orders --query 'Items[*].{order_id:order_id.S,merchant_id:merchant_id.S,amount:amount.N,created_at:created_at.N}'
output
HTTP_DUP=200
{"status":"queued"}
---DDB after dup---
[
    {
        "created_at": {
            "N": "1777385603"
        },
        "amount": {
            "N": "100"
        },
        "merchant_id": {
            "S": "m-1"
        },
        "order_id": {
            "S": "o-1"
        }
    }
]
HTTP_NEW=200
{"status":"queued"}
---DDB after second order---
[
    {
        "order_id": "o-1",
        "merchant_id": "m-1",
        "amount": "100",
        "created_at": "1777385603"
    },
    {
        "order_id": "o-2",
        "merchant_id": "m-1",
        "amount": "250",
        "created_at": "1777385618"
    }
]

[stdout]
HTTP_DUP=200
{"status":"queued"}
---DDB after dup---
[
    {
        "created_at": {
            "N": "1777385603"
        },
        "amount": {
            "N": "100"
        },
        "merchant_id": {
            "S": "m-1"
        },
        "order_id": {
            "S": "o-1"
        }
    }
]
HTTP_NEW=200
{"status":"queued"}
---DDB after second order---
[
    {
        "order_id": "o-1",
        "merchant_id": "m-1",
        "amount": "100",
        "created_at": "1777385603"
    },
    {
        "order_id": "o-2",
        "merchant_id": "m-1",
        "amount": "250",
        "created_at": "1777385618"
    }
]

Check DLQ is empty and main queue redrive

shell
aws sqs get-queue-attributes \
  --queue-url http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders-dlq.fifo \
  --attribute-names ApproximateNumberOfMessages ApproximateNumberOfMessagesNotVisible \
  --query 'Attributes'

echo "---main queue---"
aws sqs get-queue-attributes \
  --queue-url http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders.fifo \
  --attribute-names ApproximateNumberOfMessages ApproximateNumberOfMessagesNotVisible RedrivePolicy \
  --query 'Attributes'
output
{
    "ApproximateNumberOfMessages": "0",
    "ApproximateNumberOfMessagesNotVisible": "0"
}
---main queue---
{
    "ApproximateNumberOfMessages": "0",
    "ApproximateNumberOfMessagesNotVisible": "0",
    "RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo\",\"maxReceiveCount\":\"5\"}"
}

[stdout]
{
    "ApproximateNumberOfMessages": "0",
    "ApproximateNumberOfMessagesNotVisible": "0"
}
---main queue---
{
    "ApproximateNumberOfMessages": "0",
    "ApproximateNumberOfMessagesNotVisible": "0",
    "RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo\",\"maxReceiveCount\":\"5\"}"
}
  • Add SQS+DDB perms to consumer role
  • Create DDB orders table
  • Create FIFO DLQ
  • Create main FIFO queue with redrive
  • Fix Lambda handler (idempotent + correct shape) and update code
  • Create event source mapping with ReportBatchItemFailures
  • Create apigw-to-sqs role with sqs:SendMessage
  • Create REST API + /orders + POST + AWS-service SQS integration
  • Create deployment for stage dev
  • End-to-end test (single + duplicate + ordering)
All wired up and verified end-to-end. Summary: **Lambda fix** (`orders-consumer`): - Handler now uses `ConditionExpression="attribute_not_exists(order_id)"` and swallows `ConditionalCheckFailedException` , duplicate writes become no-ops at the storage layer. - Returns `{"batchItemFailures": [...]}` (the AWS-required shape) instead of `{"failed": [...]}`. **Role fix** (`orders-consumer-role`): - Added inline policy for `sqs:ReceiveMessage`, `sqs:DeleteMessage`, `sqs:GetQueueAttributes`, `sqs:ChangeMessageVisibility`, plus `dynamodb:PutItem/GetItem/UpdateItem`. **Built from scratch:** - DDB table `orders` (PK `order_id` String, PAY_PER_REQUEST). - FIFO queues: `orders-dlq.fifo`, `orders.fifo` with `RedrivePolicy → DLQ, maxReceiveCount=5`, content-based dedup off on both. - ESM main queue → `orders-consumer` with `FunctionResponseTypes=[ReportBatchItemFailures]`. - IAM role `apigw-to-sqs-role` (apigateway trust) with `sqs:SendMessage` on `orders.fifo`. - REST API `orders-api`, resource `/orders`, method `POST` (NONE auth), integration type `AWS` (not proxy) → `arn:aws:apigateway:us-east-1:sqs:path/000000000000/orders.fifo`, mapping template form-encodes `Action=SendMessage&MessageBody=<body>&MessageGroupId=<merchant_id>&MessageDeduplicationId=<order_id>`. Method+integration response 200. - Deployment to stage `dev`. **Verified inside compose network:** - POST `o-1/m-1/100` → HTTP 200, one row. - Re-POST same body → HTTP 200, row unchanged (`created_at` identical). - POST `o-2/m-1/250` → HTTP 200, second row with later timestamp (ordering preserved via `MessageGroupId=merchant_id`). - DLQ: 0 messages.
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-v0/9zMkF4cF8LKwaX_zCoPHk/bin/python
cachedir: .pytest_cache
rootdir: /tests
plugins: json-ctrf-0.3.5
collecting ... collected 19 items

../tests/test_outputs.py::test_localstack_reachable PASSED               [  5%]
../tests/test_outputs.py::test_main_fifo_queue_exists PASSED             [ 10%]
../tests/test_outputs.py::test_dlq_fifo_queue_exists PASSED              [ 15%]
../tests/test_outputs.py::test_ddb_table_exists PASSED                   [ 21%]
../tests/test_outputs.py::test_lambda_and_esm_exist PASSED               [ 26%]
../tests/test_outputs.py::test_rest_api_exists_with_post_orders PASSED   [ 31%]
../tests/test_outputs.py::test_integration_uri_targets_fifo_queue PASSED [ 36%]
../tests/test_outputs.py::test_integration_credentials_role_is_set PASSED [ 42%]
../tests/test_outputs.py::test_integration_sets_content_type_header PASSED [ 47%]
../tests/test_outputs.py::test_integration_request_template_uses_full_body PASSED [ 52%]
../tests/test_outputs.py::test_integration_request_template_has_message_group_id PASSED [ 57%]
../tests/test_outputs.py::test_integration_request_template_has_dedup_id PASSED [ 63%]
../tests/test_outputs.py::test_integration_template_identifiers_are_request_derived PASSED [ 68%]
../tests/test_outputs.py::test_stage_deployment_id_was_refreshed FAILED  [ 73%]
../tests/test_outputs.py::test_event_source_mapping_declares_report_batch_item_failures PASSED [ 78%]
../tests/test_outputs.py::test_lambda_handler_idempotency_and_response_shape PASSED [ 84%]
../tests/test_outputs.py::test_end_to_end_post_reaches_ddb_no_dlq PASSED [ 89%]
../tests/test_outputs.py::test_end_to_end_fifo_group_ordering PASSED     [ 94%]
../tests/test_outputs.py::test_end_to_end_duplicate_post_is_idempotent PASSED [100%]

=================================== FAILURES ===================================
____________________ test_stage_deployment_id_was_refreshed ____________________

apigw = <botocore.client.APIGateway object at 0xffff955f54c0>

    def test_stage_deployment_id_was_refreshed(apigw):
        """Stage redeployed after edit."""
        api_id = _find_api(apigw)
        stage = apigw.get_stage(restApiId=api_id, stageName=STAGE_NAME)
        current_dep_id = stage.get("deploymentId")
        assert current_dep_id, f"stage {STAGE_NAME} has no deploymentId"
        deployments = sorted(
            apigw.get_deployments(restApiId=api_id).get("items", []),
            key=lambda d: d.get("createdDate") or "",
        )
>       assert len(deployments) >= 2, (
            f"stage {STAGE_NAME} has only {len(deployments)} deployment(s); "
            f"editing an integration without calling create-deployment is "
            f"the #1 silent failure mode for this task , API Gateway keeps "
            f"serving the old snapshot. Deployments: {deployments!r}"
        )
E       AssertionError: stage dev has only 1 deployment(s); editing an integration without calling create-deployment is the #1 silent failure mode for this task , API Gateway keeps serving the old snapshot. Deployments: [{'id': 'opbqhnlvwd', 'createdDate': datetime.datetime(2026, 4, 28, 14, 13, 7, tzinfo=tzlocal())}]
E       assert 1 >= 2
E        +  where 1 = len([{'createdDate': datetime.datetime(2026, 4, 28, 14, 13, 7, tzinfo=tzlocal()), 'id': 'opbqhnlvwd'}])

/tests/test_outputs.py:350: AssertionError
=============================== warnings summary ===============================
test_outputs.py: 68 warnings
  /root/.cache/uv/archive-v0/9zMkF4cF8LKwaX_zCoPHk/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_localstack_reachable
PASSED ../tests/test_outputs.py::test_main_fifo_queue_exists
PASSED ../tests/test_outputs.py::test_dlq_fifo_queue_exists
PASSED ../tests/test_outputs.py::test_ddb_table_exists
PASSED ../tests/test_outputs.py::test_lambda_and_esm_exist
PASSED ../tests/test_outputs.py::test_rest_api_exists_with_post_orders
PASSED ../tests/test_outputs.py::test_integration_uri_targets_fifo_queue
PASSED ../tests/test_outputs.py::test_integration_credentials_role_is_set
PASSED ../tests/test_outputs.py::test_integration_sets_content_type_header
PASSED ../tests/test_outputs.py::test_integration_request_template_uses_full_body
PASSED ../tests/test_outputs.py::test_integration_request_template_has_message_group_id
PASSED ../tests/test_outputs.py::test_integration_request_template_has_dedup_id
PASSED ../tests/test_outputs.py::test_integration_template_identifiers_are_request_derived
PASSED ../tests/test_outputs.py::test_event_source_mapping_declares_report_batch_item_failures
PASSED ../tests/test_outputs.py::test_lambda_handler_idempotency_and_response_shape
PASSED ../tests/test_outputs.py::test_end_to_end_post_reaches_ddb_no_dlq
PASSED ../tests/test_outputs.py::test_end_to_end_fifo_group_ordering
PASSED ../tests/test_outputs.py::test_end_to_end_duplicate_post_is_idempotent
FAILED ../tests/test_outputs.py::test_stage_deployment_id_was_refreshed - Ass...
================== 1 failed, 18 passed, 68 warnings in 30.49s ==================

Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_cd164552bac84f5c. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.

Trial trial_cd164552bac84f5c · verifier authoritative; classifier explanatory.