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Build log / what I shipped with agents

Built with coding agents.

Apps I built end to end with AI-DLC and coding agents (Kiro, Claude Code, AgentCore): the problem, the fix and the evidence.

27 BUILDS · 12 PATTERN NOTES

AI Engineering

AI-DLC in a Team: the Agent Is No Longer the Bottleneck

In January I used AI-DLC alone, one developer and one agent in an IDE. This month I deployed AIDLC Collaborative, the open-source sample that runs the same method for a whole team: intents, human gates, parallel construction lanes, agents in isolated AgentCore sessions, and a platform that owns git. Two intents with the same 48 minutes of agent work took 81 and 284 minutes end to end. Here is what the team version changes, what it costs to stand up, the failure that painted 14 empty stages green, and what I have not verified yet.

·11 MIN READ Read →
AI Engineering

Kiro Trusts One File. Here Is How I Stopped Editing It by Hand

Kiro's enterprise MCP registry is one JSON file behind one URL: whatever is in it, developers see; whatever is not, never starts. That makes the file a control point — and a hand-edited control point is a liability. I rebuilt mine as a generated artifact: AWS Agent Registry as the approved catalog, AgentCore Gateway as the only remote MCP endpoint, and a small publisher that turns approvals into the file Kiro reads. Here are the five decisions, the six things the docs did not tell me, and what I still have not verified.

·11 MIN READ Read →
AI Engineering

Deck-as-Code: How a Fleet of Review Agents Saved My Conference Deck

Iterating a 24-slide conference deck under review pressure, I stopped editing PowerPoint by hand. Every version is now rebuilt by an idempotent python-pptx script from the last validated file, and reviewed by four parallel critique agents reading rendered frames — because the XML lies about what the eye sees. Eight blocking defects on a version I was ready to ship, one vertical-tab pitfall, and a ghost footer hiding in the slide master: here is the pipeline.

·10 MIN READ Read →
AI Engineering

Five Agents, One Football Team: Per-Role Model Selection and Deterministic Guardrails on AgentCore

I entered an agent football tournament: five LLM-driven players on Bedrock AgentCore, one command per game tick, every tick latency-sensitive. Per-role Nova model selection, memory switched off, and deterministic rules applied after the LLM made the team work — and then command fingerprinting in CloudWatch proved my perfectly healthy runtimes had been playing for the wrong team all along.

·9 MIN READ Read →
Cloud

Build a Live Audience Voting Game for Your Conference Talk in a Weekend (Serverless, Zero Paid Tools)

For a conference session I co-delivered, I wanted a hundred-plus people swiping live votes on their phones — without Mentimeter, without Kahoot, and without a single credential in the JavaScript bundle. The whole backend is three DynamoDB tables behind an IAM-authenticated AppSync API: a singleton GameState row drives lobby, launch, reveal and podium; Cognito guest identities sign every call with SigV4; votes are namespaced by runId so a reset hides everything without deleting anything. Total AWS bill for the event: under a dollar.

·9 MIN READ Read →
AI Engineering

In-Browser Object Detection with RF-DETR on AWS Amplify

I wanted a detection app my kids could use without a single camera frame leaving the device. The answer: RF-DETR quantized to int8, ONNX Runtime Web on threaded WASM, and a static Amplify site.

·5 MIN READ Read →
AI

Validate the Issue, Not the Structure: a Self-Correcting Pipeline for LLM-Generated Games

My pipeline generates a playable HTML5 game every day with Bedrock. An audit found 6 of 7 published games broken — while every one of them passed structural validation. Here is how I rebuilt the quality gate around real usage: hit-tested playtests, a progress-signal check, prompt contracts, and a fail-closed publish loop that rejected three broken versions before shipping a good one.

·7 MIN READ Read →
AI Engineering

Your photos, your AWS account — Argentic is on AWS Builder Center

I built an iOS photo backup where your own AWS account is the backend: no servers, on-device semantic search, a Bedrock agent in your pocket, ~$0.35/month. The full architecture story is now published on AWS Builder Center.

·3 MIN READ Read →
AI Engineering

AWS Agent Toolkit GA: How I Gave an Agent 15,000 AWS APIs Without Losing Sleep

AWS released the Agent Toolkit for AWS on May 6, 2026 -- a managed MCP server exposing the full AWS API surface to autonomous agents. I shipped an infrastructure agent the same week. Here's the two-phase safety pattern that lets you hand an agent the keys to your account without waking up to a $10K bill.

·9 MIN READ Read →
AI Engineering

When Your AI Agent Runs Away: 204 PRs, $900 Wasted, and the 3-Layer Fix

I woke up to 204 pull requests from a single autonomous agent running overnight. 12 hours, ~$900 in Bedrock tokens, 509 failed builds, zero features shipped. Prompt-only safeguards all failed. Here's the 3-layer fix — hard kill switch, atomic circuit breakers, drift observability — that now prevents runaway agents.

·13 MIN READ Read →
AI Engineering

The Agent Memory Stack: Shipping Parallel Projects with Kiro CLI and Obsidian

AI agents forget everything between sessions. Your calendar lies. Your brain doesn't scale past a handful of active projects. Here's the three-layer memory stack I built with Kiro CLI + Obsidian to ship a dozen-plus projects in parallel without cross-contamination.

·8 MIN READ Read →
AI Engineering

Boulder — The Self-Replicating AI Build Factory on AWS

Boulder is a meta-orchestrator that spawns AI workers on ECS Fargate to autonomously write, deploy and self-heal full-stack apps on Amplify Gen 2. Here is the architecture, the decisions, and why every serious AI agent system eventually converges on SQS + Bedrock + IAM.

·10 MIN READ Read →
AI Engineering

SEO Enhancement - agiusalexandre.com

Blog posts weren't appearing correctly in search results or showing rich previews when shared on social media.

·3 MIN READ Read →
AI Engineering

Tag Filtering - agiusalexandre.com

Blog readers needed a way to browse content by topic instead of scrolling through all posts.

·3 MIN READ Read →

AGENTS & PATTERNS

Design notes, before the build


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