{"product_id":"harness-engineering-brandon-kaplan-9798998018206","title":"Harness Engineering: Building, Evaluating, and Operating Reliable AI Agents","description":"\u003cp\u003eAn AI model can propose an action, but the software around it determines what happens next. Harness Engineering explains how to build that surrounding system: the execution loop, tool interfaces, context management, permission boundaries, evaluation, and operational controls that make agent behavior inspectable and manageable.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003eWritten for experienced software engineers, the book develops these ideas through a coding-agent running example and focused Python companions. It begins with a small execution loop and an independent evaluator, then introduces controlled edits, repository navigation, checkpoints, retries, and recovery. Dedicated security chapters examine prompt injection, exact-action approval, defense testing, and containment. Later chapters cover tracing, comparative evaluation, resource management, multi-agent coordination, protocol integration, durable service operation, and state evolution.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003eCode examples, diagrams, failure scenarios, exercises, and solutions explain how the mechanisms work and where their guarantees end. A free companion repository provides runnable code, tests, and retained example results. The emphasis is on understanding engineering decisions well enough to build and evaluate your own harness.\u003c\/p\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAuthor:\u003c\/b\u003e Brandon Kaplan\u003cbr\u003e\u003cb\u003eISBN-13:\u003c\/b\u003e 9798998018206\u003cbr\u003e\u003cb\u003ePublisher:\u003c\/b\u003e Kapital Labs LLC\u003cbr\u003e\u003cb\u003eLanguage:\u003c\/b\u003e English\u003cbr\u003e\u003cb\u003ePublished:\u003c\/b\u003e 09\/09\/2026\u003cbr\u003e\u003cb\u003ePages:\u003c\/b\u003e 312\u003cbr\u003e\u003cb\u003eFormat:\u003c\/b\u003e Paperback\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 1.20lbs\u003cbr\u003e\u003cb\u003eSize:\u003c\/b\u003e 10.00h x 7.00w x 0.65d","brand":"Brandon Kaplan","offers":[{"title":"Paperback","offer_id":50666270032127,"sku":"9798998018206","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/2982\/9887\/files\/img_47b1cf34-1e6b-449d-9e83-168d5e31dd18.jpg?v=1792016694","url":"https:\/\/www.whiterainbookhouse.com\/products\/harness-engineering-brandon-kaplan-9798998018206","provider":"WR Book House","version":"1.0","type":"link"}