Agentic Engineering

When to Use

User works with AI coding agents (Claude Code, Codex CLI, or similar) and wants to maximize productivity. Use for workflow optimization, parallel agent coordination, context management, and developing intuition for agentic development.

Quick Reference

Core Philosophy

Agentic engineering is about working WITH AI coding agents effectively, not building agent systems. The term was popularized by Peter Steinberger (steipete.me) in late 2025.

Core principle: Just talk to it. Skip the elaborate tooling, RAG setups, and complex orchestration. Develop intuition through practice.

Core Rules

1. Run Parallel Agents

Run 3-8 coding agent instances simultaneously in a terminal grid:

┌─────────┬─────────┬─────────┐
│ Agent 1 │ Agent 2 │ Agent 3 │
│ (main)  │ (refac) │ (tests) │
├─────────┼─────────┼─────────┤
│ Agent 4 │ Agent 5 │ Agent 6 │
│ (ui)    │ (docs)  │ (debug) │
└─────────┴─────────┴─────────┘

Most agents work in the same folder. No worktrees. Pick non-overlapping areas.

2. Think in Blast Radius

Before each prompt, estimate:

• How many files will this touch?
• How long will this take?
• Can I run this in parallel with other work?

Small blast radius → multiple parallel agents. Large blast radius → one focused agent.

3. Agents Do Atomic Commits

Configure agents to commit their own changes:

• One commit per logical change
• Only commit files the agent edited
• Clean commit messages

This keeps history navigable when multiple agents work simultaneously.

4. Refactor Regularly

Spend ~20% of time on refactoring (also done by agents):

• Code duplication (jscpd)
• Dead code (knip)
• Consolidate similar patterns
• Break apart large files
• Add tests for tricky parts

Iterate fast, then pay back tech debt.

5. CLIs Over MCPs

Prefer CLIs that agents already know:

✅ gh, vercel, psql, axiom
❌ Complex MCPs that pollute context

One line in AGENTS.md: "logs: use vercel cli" is enough.

6. Screenshots in Prompts

50%+ of prompts should include screenshots:

• Drag image into terminal
• Agent finds matching strings/elements
• Far more precise than text descriptions

No need to annotate — agents are good at matching.

7. Stop and Steer

If something takes longer than expected:

1. Press Escape
2. Ask "what's the status"
3. Help find the right direction, abort, or continue

Don't be afraid to stop agents mid-work. File changes are atomic.

Common Traps