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Strands Agents SDK Deploy — Serverless Deployment to AWS Lambda
Deploy a Strands Agents SDK agent to AWS Lambda using the official Lambda Layer. Measured cold start Init Duration at ~1 second and warm start at under 1 second.
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Tag: #lambda
Content tagged with "lambda"
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Measuring Lambda Managed Instances Provisioning Time, Multi-Concurrency, and CPU-Based Scaling
Deployed AWS Lambda Managed Instances and measured 67s provisioning, auto-distribution across 10 execution environments with multi-concurrency, and throttling under CPU load. Includes an LMI migration checklist.
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AWS DevOps Agent Verification — Auto-Trigger Investigations from Alarms via Generic Webhook
Built a CloudWatch Alarm → SNS → Lambda → Generic Webhook pipeline to auto-trigger DevOps Agent investigations. Verified HMAC signature implementation, measured alarm-to-investigation latency (~65s), and discovered that duplicate incidentIds are linked rather than deduplicated.
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Verifying AWS DevOps Agent — Auto-notifying Investigation Results via EventBridge
Verified DevOps Agent's EventBridge integration. Captured Investigation lifecycle events and built a pipeline to auto-send investigation summaries via SNS. Documents implementation gotchas including IAM action prefix and Lambda boto3 bundling.
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Deploy, test, and operations insights for the Lambda Durable Functions fraud detection demo
SAM deployment gotchas, local testing with LocalDurableTestRunner, and execution history tracking from hands-on experience. The qualified ARN requirement is the first hurdle.
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6 best practices for Lambda Durable Functions verified with a fraud detection demo
Verified idempotency, DurableExecutionName, parallel callbacks, and timeout configuration hands-on. The common principle: design everything assuming replay will happen.
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Running a fraud detection workflow with Lambda Durable Functions
Deployed the official AWS fraud detection demo and verified 3 risk-score branches with suspend behavior. Confirmed zero compute charges during checkpoint-and-replay waits.
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Lambda AZ Metadata with TypeScript Powertools — Same-AZ Routing in 3 Lines
Implement same-AZ routing using Powertools getMetadata() in TypeScript. Verified caching behavior and clearMetadataCache() with real measurement data.
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Same-AZ Routing with Lambda AZ Metadata — Halving ElastiCache Latency
Hands-on verification of Lambda's new AZ metadata endpoint. Measured same-AZ vs cross-AZ latency to an ElastiCache Valkey cluster and quantified the routing benefit.
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Lambda Rust — Zero Cold Starts with Managed Instances Multi-Concurrency
Verified Lambda Managed Instances Rust support. run_concurrent enables 8 parallel requests with 2.9ms init — effectively eliminating cold starts. Compared with standard Lambda.
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Lambda Rust — Benchmarking Official Support Cold Start and Execution Speed vs Python
Verified Lambda's GA Rust support with cargo-lambda. Cold start at 29ms, warm execution at 1.2ms — 90x faster than Python with 2.6x better memory efficiency.
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4 Things I Learned from Hands-On Testing Lambda Durable Functions
Verified Step, Wait, Callback, and Parallel patterns via AWS CLI. Sharing checkpoint-replay behavior, gotchas, and when to choose Durable Functions over Step Functions.
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Use PYTHONPATH=/var/task to prioritize bundled boto3 in Lambda for new AWS services
Lambda's managed Python runtime may lack service models for new AWS services like DevOps Agent. Set PYTHONPATH=/var/task to prioritize the bundled boto3 over the managed runtime version.
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AWS SDK for Rust takes ~900ms on first request — TLS handshake is 99%
Even when initializing the AWS SDK for Rust client during Lambda Init, the first API call takes ~900ms. Breakdown measurement revealed TLS handshake at 745ms accounts for 99%.
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Lambda Durable Functions require a qualified ARN for invocation
Invoking a Durable Function with an unqualified function name throws InvalidParameterValueException. Append $LATEST or use a published version number.
1 min read
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Lambda Durable Functions show RUNNING status even when suspended
A Durable Function waiting for a callback reports RUNNING, not SUSPENDED. Check execution history for CallbackStarted events to determine actual state.
1 min read
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Lambda AZ metadata Powertools support: Python not yet released, TypeScript available
AWS docs show Powertools code for both Python and TypeScript, but Python 3.25.0 lacks the lambda_metadata module (ModuleNotFoundError). TypeScript @aws-lambda-powertools/commons 2.32.0 works.
1 min read
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Lambda capacity-provider-config can only be set at function creation time
Trying to add it via update-function-configuration fails with CapacityProviderConfig isn't supported for Lambda Default functions.
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Lambda Managed Instances don't support --log-type Tail — use CloudWatch platform.report instead
Invoke API with Tail returns an error. Use platform.report events in CloudWatch Logs to get Duration metrics.
1 min read
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Lambda Managed Instances operator role requires AWSLambdaManagedEC2ResourceOperator
EC2 FullAccess and even AdministratorAccess fail with InsufficientRolePermissions. A dedicated managed policy is required.
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Lambda Durable Functions IAM action is CheckpointDurableExecution (singular)
Some docs reference CheckpointDurableExecutions (plural), but the actual required action is singular. Plural form causes permission errors.
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Lambda Durable Functions SDK DurableContext cannot be named-imported in .mjs
import { DurableContext } from '@aws/durable-execution-sdk-js' throws SyntaxError at runtime. Only import withDurableExecution for .mjs deployments.
1 min read