Agentic Coding Systems.

Prompt, context, harness. Score every prompt you ship, stop the six-hour context fade, and build the loop and guardrails that make an agent trustworthy on real code instead of demos.

3 titles · 5 free guides

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Start here · how-to · 9 min

Context Engineering for AI Agents

Context engineering for AI agents: build a context layer that trims the window, pins a progress note, and survives long tasks where blind compaction fails.

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Free guides

how-to 9 min read

AI Agent Guardrails: Gate Every Tool Call

AI agent guardrails belong on one line of code: the tool call. Build a deterministic gate that classifies, approves, and fails safe before any action runs.

from: Agentic Coding: Build the Harness

tutorial 9 min read

Build an AI Coding Agent From Scratch in Python

Build an AI coding agent from scratch in Python: the ~150-line agent loop that reads files, writes code, runs tests, and stops on its own. No framework.

from: Agentic Coding: Build the Harness

reference 8 min read

What Is an Agent Harness? The 7 Layers

What is an agent harness? The 7 layers wrapped around the model: loop, context, guardrails, tools, verification, recovery, orchestration. With a teardown table.

from: Agentic Coding: Build the Harness

analysis 9 min read

Why AI Agents Report False Success

Why AI agents report false success: the bias that makes them grade their own work, the $1.78M bug it shipped, and the independent check that catches it.

from: Agentic Coding: Build the Harness

Go deeper: the playbooks

Liked the guides? The playbooks go further: full build systems, $12.99 each.

Context Engineering

The 30-Day Claude Code Playbook

$12.99 claude-code

Prompt Engineering

Stop Guessing or Fall Behind

$12.99 prompt-engineering

Agentic Coding: Build the Harness

The Loop, Guardrails, and Verification That Make Your AI Coding Agent Reliable on Real Code, Not Just Demos

$12.99 ai-agents