--- title: Dispatches from O'Reilly: The right amount of spec for... description: Detailed specification matters more, not less, as AI coding agents make implementation cheap and fast. The real cost of a vague prompt shows up later in... canonical: https://daily.dev/posts/dispatches-from-o-reilly-the-right-amount-of-spec-for-agentic-development-jofa5viob twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Dispatches from O'Reilly: The right amount of spec for agentic development | daily.dev og:description: Detailed specification matters more, not less, as AI coding agents make implementation cheap and fast. The real cost of a vague prompt shows up later in... og:url: https://daily.dev/posts/dispatches-from-o-reilly-the-right-amount-of-spec-for-agentic-development-jofa5viob og:image: https://api.daily.dev/og/posts/JOfa5ViOB.png og:image:alt: Dispatches from O'Reilly: The right amount of spec for agentic development og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Dispatches from O'Reilly: The right amount of spec for agentic development **[Stack Overflow Blog](https://daily.dev/sources/stackov)** · 12 min read · 0 upvotes · 0 comments ## Summary Detailed specification matters more, not less, as AI coding agents make implementation cheap and fast. The real cost of a vague prompt shows up later in endless correction loops, while a well-reviewed spec front-loads that cost into something executable and repeatable. Specs themselves need validation before implementation starts, multi-agent pipelines need contract-level rigor between agent handoffs, and specs should shrink over time to avoid context rot and conflicting sources of truth. Well-designed, discoverable APIs let agents treat code itself as a reliable spec. Agile and XP practices like short feedback loops, test-first development, continuous integration, and small releases remain valuable, while status-meeting ceremony fades in relevance. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### why does giving an AI coding agent a vague prompt end up costing more time than writing a detailed spec upfront A vague prompt looks cheap because implementation starts immediately, but it triggers repeated correction loops: reviewing output, clarifying intent, requesting changes, rerunning tests, and finding the next gap. A human becomes the 'oracle' who must judge correctness every time. A more detailed spec with acceptance criteria or contract tests shifts that judgment into automated, repeatable checks instead. _daily.dev surfaces practical takes like this for teams weighing how much spec agentic workflows really need._ ### why do multi-agent AI coding pipelines need stronger contracts between agents than a single agent working alone Because interpretive drift compounds once one agent's output becomes another agent's input. Agent B treats Agent A's output as ground truth without knowing it misunderstood a requirement, so mistakes get buried under layers of competent-looking work by the time a human reviews it. This requires schemas, invariants, validation rules, typed interfaces, and machine-checkable handoff formats rather than a paragraph of intent. _developers designing multi-agent systems can track this kind of contract-design thinking on daily.dev._ ### why does stuffing more design documentation into an AI coding agent's context make it less reliable instead of more Because model performance degrades as input grows, even on simple tasks, a phenomenon Chroma's context rot research documents. On top of that, mixing old design prose, stale tickets, outdated plans, and current implementation makes it unclear to the model which parts are active instructions versus historical artifacts, causing self-inflicted instruction drift rather than better guidance. _daily.dev helps developers keep up with findings like context rot that shape how they prompt coding agents._ ## Similar posts on daily.dev - [AI Agents: Experience Doesn’t Fit in a Prompt](https://daily.dev/posts/ai-agents-experience-doesn-t-fit-in-a-prompt-vunycsiyo) · Atomic Spin · 0 upvotes · 0 comments - [The Spec Is the New Unit of Work: Spec-Driven Development for Teams Running AI Agents](https://daily.dev/posts/the-spec-is-the-new-unit-of-work-spec-driven-development-for-teams-running-ai-agents-thbd17u7t) · Medium · 0 upvotes · 0 comments - [How to write a good spec for AI agents](https://daily.dev/posts/how-to-write-a-good-spec-for-ai-agents-orhyl3mke) · Addy Osmani · 9 upvotes · 0 comments - [Write code not specs](https://daily.dev/posts/write-code-not-specs-dswociw3l) · Software Doug · 3 upvotes · 0 comments --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents), [#architecture](https://daily.dev/tags/architecture), [#ai-coding](https://daily.dev/tags/ai-coding) [View this post on daily.dev](https://daily.dev/posts/dispatches-from-o-reilly-the-right-amount-of-spec-for-agentic-development-jofa5viob) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Dispatches from O'Reilly: The right amount of spec for agentic development","url":"https://daily.dev/posts/dispatches-from-o-reilly-the-right-amount-of-spec-for-agentic-development-jofa5viob","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/dispatches-from-o-reilly-the-right-amount-of-spec-for-agentic-development-jofa5viob"},"datePublished":"2026-08-21T14:05:30.612Z","dateModified":"2026-09-14T08:07:20.351Z","description":"Detailed specification matters more, not less, as AI coding agents make implementation cheap and fast. 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