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.

SubtypeImplementation Bugs

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'. Agent created integration at step 49, then called create-deployment once at step 53. The instruction explicitly warned: 'after every wiring change, call apigateway create-deployment...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.' Agent created method response/integration response (step 51) between integration creation and deployment call, but never refreshed the deployment after those changes.

Root causeThe agent understood the requirement (built all resources correctly and end-to-end testing passed) but failed to properly apply the API Gateway deployment refresh pattern, specifically calling create-deployment after each integration/response configuration change. Only one deployment was created instead of the expected minimum two.

RecommendationN/A - task is fine. The instruction was explicit about this gotcha, and the test correctly validates understanding of it. Agent execution had a logical error in not refreshing the deployment after intermediate changes.

Trajectory

Tool-by-tool agent trajectory

26 tool calls · 3 tool types · 30 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 contents

shell

ls /app/

output

setup.sh
starter

[stdout]
setup.sh
starter

Read setup.sh

shell

cat /app/setup.sh

output

#!/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)

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]
#!/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)

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 folder and env vars

shell

ls /app/starter/ 2>/dev/null && echo "---" && env | grep -E "AWS|REGION"

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 pre-seeded lambda and role

shell

aws lambda get-function --function-name orders-consumer --query 'Configuration.{State:State,Role:Role,Handler:Handler}' && echo "---" && aws iam list-attached-role-policies --role-name orders-consumer-role

output

{
    "State": "Active",
    "Role": "arn:aws:iam::000000000000:role/orders-consumer-role",
    "Handler": "handler.lambda_handler"
}
---
{
    "AttachedPolicies": [
        {
            "PolicyName": "AWSLambdaBasicExecutionRole",
            "PolicyArn": "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
        }
    ]
}

[stdout]
{
    "State": "Active",
    "Role": "arn:aws:iam::000000000000:role/orders-consumer-role",
    "Handler": "handler.lambda_handler"
}
---
{
    "AttachedPolicies": [
        {
            "PolicyName": "AWSLambdaBasicExecutionRole",
            "PolicyArn": "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
        }
    ]
}

List existing resources

shell

aws sqs list-queues 2>/dev/null; aws dynamodb list-tables 2>/dev/null; aws apigateway get-rest-apis 2>/dev/null

output

{
    "TableNames": []
}
{
    "items": []
}

[stdout]
{
    "TableNames": []
}
{
    "items": []
}

Now I'll build the stack. Starting with DDB, queues, and IAM policies in parallel.

Create DDB orders 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 DLQ FIFO queue

shell

aws sqs create-queue \
  --queue-name orders-dlq.fifo \
  --attributes FifoQueue=true \
  --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=$(printf '{"deadLetterTargetArn":"%s","maxReceiveCount":"3"}' "$DLQ_ARN")
aws sqs create-queue \
  --queue-name orders.fifo \
  --attributes "FifoQueue=true,RedrivePolicy=$REDRIVE,VisibilityTimeout=60" \
  --query 'QueueUrl' --output text

output

Exit code 252
DLQ_ARN=arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo

aws: [ERROR]: An error occurred (ParamValidation): Error parsing parameter '--attributes': Expected: '=', received: '"' for input:
 FifoQueue=true,RedrivePolicy={"deadLetterTargetArn":"arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo","maxReceiveCount":"3"},VisibilityTimeout=60
                              ^

[error] tool reported failure

Create main queue with redrive via file

shell

cat > /tmp/main-queue-attrs.json <<'JSON'
{
  "FifoQueue": "true",
  "VisibilityTimeout": "60",
  "RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:000000000000:orders-dlq.fifo\",\"maxReceiveCount\":\"3\"}"
}
JSON
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"}

Create DDB orders table
Create DLQ + main FIFO queue with redrive
Add SQS+DDB policy to consumer role
Fix lambda handler (idempotent + batchItemFailures)
Create event source mapping (queue -> lambda)
Create apigw->sqs role
Create REST API + resource + method + integration + deployment
End-to-end test (POST + duplicate + ordering)

Add SQS+DDB policy to consumer role

shell

cat > /tmp/consumer-policy.json <<'JSON'
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "sqs:ReceiveMessage",
        "sqs:DeleteMessage",
        "sqs:GetQueueAttributes",
        "sqs:ChangeMessageVisibility"
      ],
      "Resource": "arn:aws:sqs:us-east-1:000000000000:orders.fifo"
    },
    {
      "Effect": "Allow",
      "Action": [
        "dynamodb:PutItem",
        "dynamodb:GetItem",
        "dynamodb:UpdateItem"
      ],
      "Resource": "arn:aws:dynamodb:us-east-1:000000000000:table/orders"
    }
  ]
}
JSON
aws iam put-role-policy \
  --role-name orders-consumer-role \
  --policy-name orders-consumer-inline \
  --policy-document file:///tmp/consumer-policy.json
echo "policy attached"

output

policy attached

[stdout]
policy attached

Write fixed handler.py and zip

shell

mkdir -p /tmp/lambda-fix
cat > /tmp/lambda-fix/handler.py <<'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() * 1000))},
            },
            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}
PY
(cd /tmp/lambda-fix && zip -q handler.zip handler.py)
ls -la /tmp/lambda-fix/

output

total 16
drwxr-xr-x 2 root root 4096 Apr 28 13:50 .
drwxrwxrwt 1 root root 4096 Apr 28 13:50 ..
-rw-r--r-- 1 root root 1393 Apr 28 13:50 handler.py
-rw-r--r-- 1 root root  817 Apr 28 13:50 handler.zip

[stdout]
total 16
drwxr-xr-x 2 root root 4096 Apr 28 13:50 .
drwxrwxrwt 1 root root 4096 Apr 28 13:50 ..
-rw-r--r-- 1 root root 1393 Apr 28 13:50 handler.py
-rw-r--r-- 1 root root  817 Apr 28 13:50 handler.zip

Update lambda code

shell

aws lambda update-function-code \
  --function-name orders-consumer \
  --zip-file fileb:///tmp/lambda-fix/handler.zip \
  --query '{State:State,LastUpdateStatus:LastUpdateStatus}' --output json
for _ in $(seq 1 30); do
  S=$(aws lambda get-function --function-name orders-consumer --query 'Configuration.LastUpdateStatus' --output text)
  [ "$S" = "Successful" ] && echo "lambda updated" && break
  sleep 1
done

output

{
    "State": "Active",
    "LastUpdateStatus": "InProgress"
}
lambda updated

[stdout]
{
    "State": "Active",
    "LastUpdateStatus": "InProgress"
}
lambda updated

Create event source mapping

shell

aws lambda create-event-source-mapping \
  --function-name orders-consumer \
  --event-source-arn arn:aws:sqs:us-east-1:000000000000:orders.fifo \
  --batch-size 10 \
  --function-response-types ReportBatchItemFailures \
  --query '{UUID:UUID,State:State}' --output json

output

{
    "UUID": "de78eb42-0cdb-4022-a2c6-a7f9622ea826",
    "State": "Creating"
}

[stdout]
{
    "UUID": "de78eb42-0cdb-4022-a2c6-a7f9622ea826",
    "State": "Creating"
}

Create apigw->sqs role and policy

shell

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

cat > /tmp/apigw-sqs-policy.json <<'JSON'
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": ["sqs:SendMessage", "sqs:GetQueueUrl", "sqs:GetQueueAttributes"],
      "Resource": "arn:aws:sqs:us-east-1:000000000000:orders.fifo"
    }
  ]
}
JSON
aws iam put-role-policy \
  --role-name apigw-to-sqs-role \
  --policy-name apigw-sqs-send \
  --policy-document file:///tmp/apigw-sqs-policy.json
echo "apigw-to-sqs-role ready"

output

arn:aws:iam::000000000000:role/apigw-to-sqs-role
apigw-to-sqs-role ready

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

Create DDB orders table
Create DLQ + main FIFO queue with redrive
Add SQS+DDB policy to consumer role
Fix lambda handler (idempotent + batchItemFailures)
Create event source mapping (queue -> lambda)
Create apigw->sqs role
Create REST API + resource + method + integration + deployment
End-to-end test (POST + duplicate + ordering)

Create rest-api, root, /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[?path==`/`].id' --output text)
echo "ROOT_ID=$ROOT_ID"
RES_ID=$(aws apigateway create-resource --rest-api-id "$API_ID" --parent-id "$ROOT_ID" --path-part orders --query 'id' --output text)
echo "RES_ID=$RES_ID"
echo "$API_ID" > /tmp/api_id
echo "$RES_ID" > /tmp/res_id

output

API_ID=6nglmqjffw
ROOT_ID=7tjvjxamuz
RES_ID=6j6txvfbnh

[stdout]
API_ID=6nglmqjffw
ROOT_ID=7tjvjxamuz
RES_ID=6j6txvfbnh

Create POST method

shell

API_ID=$(cat /tmp/api_id)
RES_ID=$(cat /tmp/res_id)

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

output

POST

[stdout]
POST

Create AWS service integration for SQS

shell

API_ID=$(cat /tmp/api_id)
RES_ID=$(cat /tmp/res_id)

cat > /tmp/req-template.txt <<'TPL'
Action=SendMessage&MessageBody=$util.urlEncode($input.body)&MessageGroupId=$util.urlEncode($input.path('$.merchant_id'))&MessageDeduplicationId=$util.urlEncode($context.requestId)
TPL

cat > /tmp/req-templates.json <<'JSON'
{
  "application/json": "Action=SendMessage&MessageBody=$util.urlEncode($input.body)&MessageGroupId=$util.urlEncode($input.path('$.merchant_id'))&MessageDeduplicationId=$util.urlEncode($context.requestId)"
}
JSON

aws apigateway put-integration \
  --rest-api-id "$API_ID" \
  --resource-id "$RES_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-templates.json \
  --passthrough-behavior NEVER \
  --query 'type' --output text

output

AWS

[stdout]
AWS

Method response and integration response 200

shell

API_ID=$(cat /tmp/api_id)
RES_ID=$(cat /tmp/res_id)

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

# Integration response 200 , translate SQS XML to JSON {"ok":true}
cat > /tmp/int-resp-tpl.json <<'JSON'
{"application/json":"{\"ok\":true}"}
JSON

aws apigateway put-integration-response \
  --rest-api-id "$API_ID" \
  --resource-id "$RES_ID" \
  --http-method POST \
  --status-code 200 \
  --response-templates file:///tmp/int-resp-tpl.json \
  --query 'statusCode' --output text

output

200
200

[stdout]
200
200

Create deployment to dev stage

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 json

output

{
    "id": "a7ahv4am1q",
    "createdDate": "2026-04-28T13:51:31+00:00"
}

[stdout]
{
    "id": "a7ahv4am1q",
    "createdDate": "2026-04-28T13:51:31+00:00"
}

Now end-to-end tests.

Wait for ESM and POST first order

shell

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

# wait for ESM
for _ in $(seq 1 20); do
  ST=$(aws lambda list-event-source-mappings --function-name orders-consumer --query 'EventSourceMappings[0].State' --output text)
  echo "ESM state=$ST"
  [ "$ST" = "Enabled" ] && break
  sleep 1
done

# Test 1: POST a single order
RES=$(curl -s -o /tmp/r1 -w "HTTP=%{http_code}" -X POST -H "Content-Type: application/json" \
  "$URL" -d '{"order_id":"ord-001","merchant_id":"merch-A","amount":1000}')
echo "POST1 $RES"
cat /tmp/r1; echo

output

URL=http://localstack:4566/restapis/6nglmqjffw/dev/_user_request_/orders
ESM state=Enabled
POST1 HTTP=200
{"ok":true}

[stdout]
URL=http://localstack:4566/restapis/6nglmqjffw/dev/_user_request_/orders
ESM state=Enabled
POST1 HTTP=200
{"ok":true}

Verify row + check DLQ

shell

# Wait for processing
sleep 5
aws dynamodb scan --table-name orders --query 'Items' --output json
echo "---DLQ---"
aws sqs get-queue-attributes \
  --queue-url http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders-dlq.fifo \
  --attribute-names ApproximateNumberOfMessages \
  --query 'Attributes' --output json

output

[
    {
        "created_at": {
            "N": "1777384304742"
        },
        "amount": {
            "N": "1000"
        },
        "merchant_id": {
            "S": "merch-A"
        },
        "order_id": {
            "S": "ord-001"
        }
    }
]
---DLQ---
{
    "ApproximateNumberOfMessages": "0"
}

[stdout]
[
    {
        "created_at": {
            "N": "1777384304742"
        },
        "amount": {
            "N": "1000"
        },
        "merchant_id": {
            "S": "merch-A"
        },
        "order_id": {
            "S": "ord-001"
        }
    }
]
---DLQ---
{
    "ApproximateNumberOfMessages": "0"
}

Test duplicate + ordering

shell

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

# Duplicate POST , same order_id
RES=$(curl -s -o /tmp/r2 -w "HTTP=%{http_code}" -X POST -H "Content-Type: application/json" \
  "$URL" -d '{"order_id":"ord-001","merchant_id":"merch-A","amount":1000}')
echo "POST-dup $RES"; cat /tmp/r2; echo
sleep 5

# Now POST a different order_id under merch-A (after ord-001) to verify ordering
RES=$(curl -s -o /tmp/r3 -w "HTTP=%{http_code}" -X POST -H "Content-Type: application/json" \
  "$URL" -d '{"order_id":"ord-002","merchant_id":"merch-A","amount":2500}')
echo "POST2 $RES"; cat /tmp/r3; echo
sleep 5

aws dynamodb scan --table-name orders --query 'Items' --output json
echo "---DLQ---"
aws sqs get-queue-attributes \
  --queue-url http://sqs.us-east-1.localhost.localstack.cloud:4566/000000000000/orders-dlq.fifo \
  --attribute-names ApproximateNumberOfMessages \
  --query 'Attributes' --output json

output

POST-dup HTTP=200
{"ok":true}
POST2 HTTP=200
{"ok":true}
[
    {
        "created_at": {
            "N": "1777384325842"
        },
        "amount": {
            "N": "2500"
        },
        "merchant_id": {
            "S": "merch-A"
        },
        "order_id": {
            "S": "ord-002"
        }
    },
    {
        "created_at": {
            "N": "1777384304742"
        },
        "amount": {
            "N": "1000"
        },
        "merchant_id": {
            "S": "merch-A"
        },
        "order_id": {
            "S": "ord-001"
        }
    }
]
---DLQ---
{
    "ApproximateNumberOfMessages": "0"
}

[stdout]
POST-dup HTTP=200
{"ok":true}
POST2 HTTP=200
{"ok":true}
[
    {
        "created_at": {
            "N": "1777384325842"
        },
        "amount": {
            "N": "2500"
        },
        "merchant_id": {
            "S": "merch-A"
        },
        "order_id": {
            "S": "ord-002"
        }
    },
    {
        "created_at": {
            "N": "1777384304742"
        },
        "amount": {
            "N": "1000"
        },
        "merchant_id": {
            "S": "merch-A"
        },
        "order_id": {
            "S": "ord-001"
        }
    }
]
---DLQ---
{
    "ApproximateNumberOfMessages": "0"
}

Create DDB orders table
Create DLQ + main FIFO queue with redrive
Add SQS+DDB policy to consumer role
Fix lambda handler (idempotent + batchItemFailures)
Create event source mapping (queue -> lambda)
Create apigw->sqs role
Create REST API + resource + method + integration + deployment
End-to-end test (POST + duplicate + ordering)

All wired up and verified end-to-end. Summary: **Built** - `orders` DDB table (pk `order_id` String) - `orders-dlq.fifo` + `orders.fifo` with redrive (maxReceiveCount=3) - `apigw-to-sqs-role` with `sqs:SendMessage` on the main queue - REST API `orders-api`, resource `/orders`, method `POST`, AWS-service integration directly to SQS (mapping template URL-encodes the body, sets `MessageGroupId=$.merchant_id`, `MessageDeduplicationId=$context.requestId`), 200 method+integration response returning `{"ok":true}`. Deployed to stage `dev`. - Event source mapping `orders.fifo → orders-consumer` with `ReportBatchItemFailures` **Fixed** - `orders-consumer-role`: added inline policy granting `sqs:ReceiveMessage/DeleteMessage/GetQueueAttributes/ChangeMessageVisibility` on the main queue and `dynamodb:PutItem/GetItem/UpdateItem` on the table. - `orders-consumer` handler: returns the AWS-required `{"batchItemFailures":[...]}` shape; `PutItem` is idempotent via `ConditionExpression="attribute_not_exists(order_id)"` (silently swallows `ConditionalCheckFailedException`); `created_at` uses millisecond timestamps so ordering between close-together inserts is preserved. **Verified** - POST `ord-001/merch-A/1000` → HTTP 200, one row. - Duplicate POST same body → HTTP 200, row unchanged (same `created_at` 1777384304742). - POST `ord-002/merch-A/2500` → HTTP 200, second row with later `created_at` 1777384325842 (ordering preserved). - DLQ depth: 0 throughout.

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-v0/1Ued0-DOFAArs60esBB5W/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 0xffff88265400>

    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': 'a7ahv4am1q', 'createdDate': datetime.datetime(2026, 4, 28, 13, 51, 31, tzinfo=tzlocal())}]
E       assert 1 >= 2
E        +  where 1 = len([{'createdDate': datetime.datetime(2026, 4, 28, 13, 51, 31, tzinfo=tzlocal()), 'id': 'a7ahv4am1q'}])

/tests/test_outputs.py:350: AssertionError
=============================== warnings summary ===============================
test_outputs.py: 72 warnings
  /root/.cache/uv/archive-v0/1Ued0-DOFAArs60esBB5W/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, 72 warnings in 36.90s ==================

Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_eee2ab29e0824dcf. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.

Trial trial_eee2ab29e0824dcf · verifier authoritative; classifier explanatory.