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Kiro brings conversational AI coding and spec-driven development into one workflow: you can explore a change through prompts, or formalize a larger feature into requirements and implementation guidance before building. Use a quick prompt-and-review loop for small, reversible work; write a spec when scope, ambiguity, coordination, or traceability makes it costly to guess.
What is the difference between vibe coding and spec-driven development?
“Vibe coding” describes a conversational loop: explain what you want, inspect the generated change, and prompt again. It is useful when the goal is easy to judge directly, such as exploring an interface idea, making a localized edit, or asking for an explanation. The term describes a workflow, not a formal standard.
Spec-driven development adds an explicit requirements and planning layer before or alongside implementation. A spec gives the developer and the coding agent a shared account of what the feature should do and guidance for how to implement it. That structure can help with complex work, but it also takes time to create and review. Neither workflow is a universal replacement for the other.
AWS characterizes prompt-and-iterate coding as potentially effective for prototypes while noting that complex projects can lack clear documentation or a record of why decisions were made. That is a risk to consider, not proof that every prompt-led project will have those problems.
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When should I write a spec before asking AI to code?
Choose the workflow by asking how costly a wrong assumption would be. A small, easily inspected change is usually a good candidate for direct prompting. A feature that spans components, has unclear requirements, or needs a shared plan deserves more structure. This is a practical decision rule, not a measured Kiro performance result.
| Decision factor | Prompt-and-review loop | Spec-first or spec-alongside work |
|---|---|---|
| Ambiguity | The desired result is clear enough to judge by looking at it. | People need to clarify what “done” means before implementation. |
| Scope | A local edit or bounded experiment. | A feature crosses files, components, or services. |
| Traceability | Reviewing the change itself is sufficient for the task. | Reviewers need requirements and planned work alongside the code. |
| Iteration cost | Trying a change directly is cheaper than planning it in advance. | Rework from an incorrect assumption could outweigh the cost of agreeing on a plan. |
| Human review | Inspect the generated change and run the checks appropriate to it. | Review the spec and implementation, then run the checks appropriate to the feature. |
AWS documentation presents specs as a way to formalize complex features. An AWS Builder Center guide identifies multi-component development, refactoring, onboarding, and high ambiguity as situations where specs can be useful. A hybrid is also reasonable: use conversation to explore options, then capture the agreed requirements before asking for a broader implementation.
How does Kiro combine the two workflows?
AWS describes Kiro as an agentic coding service that works alongside a developer to turn prompts into detailed specs and then into code, documentation, and tests. In practice, its documented features support both conversational iteration and more structured work:
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →- Specs: Structured artifacts for formalizing complex feature development and guiding implementation.
- Hooks: Predefined agent actions triggered by IDE or other specified events. AWS examples include actions on save, create, or delete, with uses such as checks, documentation, and test generation.
- Steering: Markdown files that preserve workspace context, including project conventions, architecture, and standards.
- Additional agent capabilities: AWS’s April 30, 2026 announcement lists custom subagents and powers, as well as inline chat, terminal integration, and MCP support.
These features can make instructions and recurring actions more explicit, but they do not remove the need to decide whether a task needs a spec or to verify the resulting code. A hook can trigger an action; that alone does not establish that the action is appropriate for every change or that its output is correct.
Is Kiro only for AWS projects?
The reviewed AWS materials establish that Kiro is built on Amazon Bedrock and describe its development features. They do not establish that it is limited to AWS projects, nor do they provide enough information to make a general claim about compatibility with every language, provider, or development environment. Check current Kiro documentation for the specific integrations and platform support your project requires.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should developers keep in mind?
- Specs are a coordination tool, not a guarantee. They can make requirements and plans visible, but the team still needs to check that the spec is correct and complete.
- Generated code still needs review and testing. AWS feature descriptions do not establish that generated output is production-ready or correct for a particular project.
- Do not infer a universal speed or cost advantage. The reviewed official materials describe features and workflows; they do not establish comparative productivity, defect rates, or savings.
- Account terms can matter for data handling. AWS’s product overview says content from Kiro Free Tier and individual subscribers may be used for service improvement, and that enterprise customers have the option of customer-managed keys. Check the current AWS terms for the applicable account type before using Kiro with sensitive project material.
The practical distinction is not “informal versus professional.” It is whether the task is cheap to explore directly or costly to misunderstand. Kiro supports both modes, so developers can start conversationally and add explicit structure when the work calls for it.
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