# Brownfield Agentic Engineering

DevFeed: [Brownfield Agentic Engineering](<https://devfeed.tech/articles/brownfield-agentic-engineering-18048.md>)

Original publisher: [Read original article](<https://addyo.substack.com/p/brownfield-agentic-engineering>)

Author: Addy Osmani

Published: 2026-09-14T14:32:06Z

Content type: article

Language: en

Sources: [Elevate](<https://devfeed.tech/sources/elevate.md>)

Topics: [coding](<https://devfeed.tech/topics/coding.md>), [Testing](<https://devfeed.tech/topics/testing.md>), [systems](<https://devfeed.tech/topics/systems.md>), [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [Software](<https://devfeed.tech/topics/software.md>)

Tags: [agentic](<https://devfeed.tech/tags/agentic.md>), [agents](<https://devfeed.tech/tags/agents.md>), [code](<https://devfeed.tech/tags/code.md>), [coding](<https://devfeed.tech/tags/coding.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [software](<https://devfeed.tech/tags/software.md>), [systems](<https://devfeed.tech/tags/systems.md>), [technical](<https://devfeed.tech/tags/technical.md>), [testing](<https://devfeed.tech/tags/testing.md>)

## AI overview

The article discusses agentic engineering in older brownfield codebases, where important constraints and system behavior exist outside the repository. It emphasizes making hidden constraints visible, using strong testing and verification, and introducing autonomous changes carefully to avoid brittle tests and technical debt.

## Source excerpt

What it takes to run agents in a codebase older than the team