Mr.D Technical Blog / Community notes
Problems, solved.
Interesting engineering problems, the trade-offs behind them, and practical solutions shared with the community. Follow via RSS
#012Oct 21, 2026
AWS / RAG architecture · 14 min
Amazon Bedrock RAG Architecture: 5 Ways to Build with Managed Knowledge Bases
Managed vs customer-managed Knowledge Bases, then five Amazon Bedrock RAG architectures: direct inference, AgentCore Harness, Strands and Agentic Retrieval, with trade-offs.
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#011Oct 11, 2026
AI / Agent engineering
Inside ReelHive: an agent harness built with Strands Graph
How six agent roles, Strands graphs, production scripts, and quality gates work together to turn a brief into a narrated video in ReelHive.
#010Oct 05, 2026
AWS / RAG architecture
RAG on AWS: Which Pattern Fits Your Use Case?
Eight RAG patterns in one visual guide: practical examples, what AWS supports, and where retrieval is heading.
#009Oct 05, 2026
AI engineering
SDLC vs AI-DLC: do AI agents really need a new development lifecycle?
Everyone is redrawing the software lifecycle for AI agents. A critical look at AWS AI-DLC and the "ADLC" infographics, what coding agents already do on their own, what holds up, what doesn't, and where this is heading.
#008Oct 05, 2026
AI engineering
What is Jev? Why everyone is excited about a model that can't write a sentence
Jev from TypeSafe AI returns typed decisions instead of text. A critical overview of the hype, the vendor numbers, how it fits on AWS with Bedrock AgentCore, and where it is actually useful.
#007Sep 29, 2026
SEO / AI search
An SEO and GEO Runbook for Product Sites: What Actually Moved the Needle
A field runbook for getting a product site crawled, understood, and quoted by Google, ChatGPT, Perplexity, and Claude, with the pitfalls that cost the most time.
#006Sep 29, 2026
Cloud security
Start compliant: a Terraform Fargate baseline that passes the scanner on day one
How the open-source Terraform ECS Fargate starter now ships the controls WardBee by ScanComb checks for, so new services begin with evidence instead of a remediation backlog.
#005Aug 09, 2026
AWS / RAG engineering
Bedrock Knowledge Base Chunking Strategies: How to Choose (and What Changed in 2026)
A practical decision guide to Bedrock Knowledge Base chunking, the managed-versus-customer-managed fork, starting parameters, evaluation, and Terraform.
#004Jul 28, 2026
MCP / Migration
MCP v2 Migration Guide: What Changed and Should You Upgrade?
A practical MCP v2 migration guide covering SDK changes, the stateless 2026 protocol, compatibility risks, and when upgrading is worth it.
#003Jul 28, 2026
MCP / Agent skills
Should Every MCP Server Ship with an Agent Skill?
An MCP server must stand on its own. Learn when an optional agent skill adds real value—and when it only hides a poor interface.
#002Jul 28, 2026
MCP / Agent engineering
15 Rules for Designing Token-Efficient MCP APIs for AI Agents
Fifteen practical rules for MCP APIs that reduce tool calls, context bloat, latency, and cost without starving AI agents of useful data.
#001Jul 23, 2026
Open source
The small tools we built for ourselves and decided to give away
Our open-source toolbox came out of daily annoyances, not a product plan. Here's what each tool does and why we use it ourselves.
#010Oct 05, 2026
AWS / RAG architecture
RAG on AWS: Which Pattern Fits Your Use Case?
Eight RAG patterns in one visual guide: practical examples, what AWS supports, and where retrieval is heading.
#009Oct 05, 2026
AI engineering
SDLC vs AI-DLC: do AI agents really need a new development lifecycle?
Everyone is redrawing the software lifecycle for AI agents. A critical look at AWS AI-DLC and the "ADLC" infographics, what coding agents already do on their own, what holds up, what doesn't, and where this is heading.
#008Oct 05, 2026
AI engineering
What is Jev? Why everyone is excited about a model that can't write a sentence
Jev from TypeSafe AI returns typed decisions instead of text. A critical overview of the hype, the vendor numbers, how it fits on AWS with Bedrock AgentCore, and where it is actually useful.
#007Sep 29, 2026
SEO / AI search
An SEO and GEO Runbook for Product Sites: What Actually Moved the Needle
A field runbook for getting a product site crawled, understood, and quoted by Google, ChatGPT, Perplexity, and Claude, with the pitfalls that cost the most time.
#006Sep 29, 2026
Cloud security
Start compliant: a Terraform Fargate baseline that passes the scanner on day one
How the open-source Terraform ECS Fargate starter now ships the controls WardBee by ScanComb checks for, so new services begin with evidence instead of a remediation backlog.
#005Aug 09, 2026
AWS / RAG engineering
Bedrock Knowledge Base Chunking Strategies: How to Choose (and What Changed in 2026)
A practical decision guide to Bedrock Knowledge Base chunking, the managed-versus-customer-managed fork, starting parameters, evaluation, and Terraform.
#004Jul 28, 2026
MCP / Migration
MCP v2 Migration Guide: What Changed and Should You Upgrade?
A practical MCP v2 migration guide covering SDK changes, the stateless 2026 protocol, compatibility risks, and when upgrading is worth it.
#003Jul 28, 2026
MCP / Agent skills
Should Every MCP Server Ship with an Agent Skill?
An MCP server must stand on its own. Learn when an optional agent skill adds real value—and when it only hides a poor interface.
#002Jul 28, 2026
MCP / Agent engineering
15 Rules for Designing Token-Efficient MCP APIs for AI Agents
Fifteen practical rules for MCP APIs that reduce tool calls, context bloat, latency, and cost without starving AI agents of useful data.
#001Jul 23, 2026
Open source
The small tools we built for ourselves and decided to give away
Our open-source toolbox came out of daily annoyances, not a product plan. Here's what each tool does and why we use it ourselves.
What we write about
Solutions worth carrying into the next build.
01Engineering solutions
Concrete fixes for problems found while building.
02Architecture
Trade-offs, systems, and decisions that survived shipping.
03Agent engineering
Practical MCP, AI-agent, and development workflows.
04Open-source work
Tools and patterns released for the wider community.