# Blog

Essays on agentic engineering, security, multi-agent systems, and production deployments.

## Latest Posts

### [What Is an AI Agent, Really?](/blog/posts/what-is-an-agent) — June 2
LLM + Tools + Loop. The simplest correct explanation.

### [Why One Agent Is Not Enough](/blog/posts/why-multi-agent) — June 3
Context, capability, and reliability ceilings of single-agent systems.

### [Vibe Coding vs Agentic Engineering](/blog/posts/vibe-vs-agentic) — June 4
The 5 hard rules that separate production from prompt gambling.

### [The Repo Is the Spec](/blog/posts/repo-is-spec) — June 5
Why every instruction your agent needs must live in a file.

### [The 6-Level Security Ladder](/blog/posts/security-ladder) — June 6
How to stop your AI agents from destroying production. From ACIP to no-bash.

### [Choosing Your Security Level](/blog/posts/choosing-security-level) — June 7
Which L-level you need based on what your agent can access.

### [The Verifier Pattern](/blog/posts/verifier-pattern) — June 8
A read-only verification agent that catches mistakes before production.

### [Agent Memory: Mental Models](/blog/posts/mental-models) — June 9
How agents remember across sessions using self-maintained expertise files.

### [The 3x Rule of Agent Costs](/blog/posts/three-x-rule) — June 10
Why production agents cost 3x your prototype estimate.

### [Cascade Routing: Cut API Costs by 66%](/blog/posts/cascade-routing) — June 11
Use cheap models for simple steps, expensive models for complex reasoning.

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*Posts are based on content from the [Agentic Engineering Course](/). Each topic has a corresponding module with labs and exercises.*