AI, LLMs, and applied ML.
Senior-engineer field notes on AI, LLMs, agents, and applied machine learning by Ercan Ermis.
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AWS Monthly (Mar '26): Governance Comes for the Agents
March 2026 on AWS: AgentCore Policy and Evaluations reach GA, Elemental Inference ships, and agent governance moves from demo to a production control plane.
Streaming Responses Are a UX Decision, Not a Performance One
Streaming model responses is a user-experience choice about time to first token, not a speed fix. Sometimes it makes structured output and tool use worse.
Bedrock Agents vs Rolling Your Own Loop
Amazon Bedrock Agents handle orchestration, memory, and tool calls for you. Here is when the managed framework saves you real work and when it quietly owns you.
IAM for LLM Apps: Least Privilege When the Caller Is a Model
When the caller is a model, least privilege still applies. Give each agent tool a scoped IAM role and a session policy, not one broad set of admin credentials.
Someone Registered antrophic.com and Points It Straight to OpenAI
Someone registered antrophic.com, one letter off the real domain, and pointed it straight at OpenAI. A look at the bait and at AI brand confusion.
Stop Fine-Tuning. You Need RAG, a Cache, and Better Prompts
Fine-tuning plus provisioned throughput is the expensive answer to most LLM problems. The cheaper path is retrieval, prompt caching, and better prompts.
Knowledge Base Chunking Is Where Your RAG Quality Dies
Most bad RAG answers are a retrieval problem, not a model problem. How fixed, semantic, and hierarchical chunking in Bedrock Knowledge Bases set your quality.
Bedrock Guardrails Won't Save You From Prompt Injection
Amazon Bedrock Guardrails filter content, they do not authorize actions. Real prompt injection defense is input isolation, tool allowlists, and IAM scoping.
Cutting Amazon Bedrock Knowledge Base Costs by ~90%: Migrating from OpenSearch Serverless to Aurora Serverless v2 with pgvector
An OpenSearch Serverless vector store costs roughly $700/month before you ingest a document. Aurora Serverless v2 with pgvector drops that floor under $50.
AWS Monthly (Dec '25): The Kiro Era Begins
We ended the year with the General Availability of Kiro (Frontier Agents). Kiro is not just a chatbot; it’s a Virtual Software Development...
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