Kiro – Development and Coding AI Tool
Kiro Review
Verdict
- Who it’s for: Developers and teams who want to plan features as specs before building, including on large codebases.
- Best thing: Its spec workflow breaks a feature idea into requirements, a design and trackable tasks.
- Good to know: You still need to check that the code does what you meant, even when tests pass.
- Verdict: A good fit if you like planning before coding, since it checks requirements for gaps and contradictions first, but passing tests still do not prove the code matches your intent.
What Is Kiro?
Kiro is an AI-powered development environment that helps you build software from prototype to production.
Kiro’s IDE, CLI, Web and Mobile connect to the same shared agent harness.
Overview
Kiro turns prompts into requirements, architectural designs and sequenced tasks, then implements them with parallel agents.
Project steering files provide context about a codebase, its conventions and its requirements.
The same project configuration can be used across Kiro surfaces.
Kiro supports hooks, MCP, skills and custom agents.
How Kiro Works
- Assemble context: The harness gathers the prompt, conversation history, steering files and attached material before the model responds.
- Plan and use tools: The model can respond with text or tool calls; Kiro checks tool calls against permission rules before running them.
- Feed results back: Tool results return to the model and the cycle continues until the task is complete.
- Manage long sessions: As a conversation approaches the model’s context limit, Kiro can summarise older history so the session can continue.
Practical Workflow Integration
Teams can keep shared project instructions and other configuration in the repository’s .kiro folder.
The CLI includes headless mode for scripts and CI, while the Web surface supports browser-based work and pull-request delivery.
Cloud sessions can be started on one surface and picked up on another.
Key Features
- Specs: Specs organise feature work into requirements, design and implementation tasks.
- Steering: Steering files provide context about your project, including its codebase, conventions and requirements.
- Hooks: Hooks can trigger predefined actions in response to agent events.
- MCP: MCP allows Kiro to access specialized tools, APIs, knowledge bases and external services.
- Permissions: Permission rules are evaluated before a tool runs: deny overrides ask, and ask overrides allow.
- Cloud sessions: Web and Mobile run the harness in a managed cloud sandbox.
- Models: Kiro offers model choices, and Auto selects a model based on the task.
Market Positioning
Kiro helps developers and teams turn prompts into executable specs, validate code correctness to find bugs unit tests miss, and build across large codebases with parallel agents that learn from every session.
It also supports several ways of working, from an editor and terminal to browser-based sessions and mobile access.
Best Case Scenarios
- Planning a feature: Specs transform high level feature ideas into detailed implementation plans.
- Keeping work consistent: Shared steering files can give the agent project context and conventions across surfaces.
- Automating repeatable work: Agent hooks automatically execute predefined actions when events occur, such as file changes, tool use or task execution.
- Working across devices: Mobile picks up the same cloud sessions, so you can start work in the browser and check in from your phone.
Example Use Cases and Prompts
Describe what you want to build in natural language.
- “Add a user authentication system with login, logout, and password reset functionality”
- “When the agent saves a React component file, automatically create or update its corresponding test file”
Limitations
- Surface availability varies: Not every capability is available on every surface, so check the relevant feature’s availability information.
- Local and cloud work differ: The IDE and CLI use your local machine by default, while Web and Mobile work in a managed cloud sandbox.
- Cloud delivery uses pull requests: Kiro clones your connected repository into an isolated environment and delivers changes as pull requests or merge requests.
- Workspace trust stays local: Per project permission rules are stored on your machine, outside the repository.
Troubleshooting and Mistakes to Avoid
- Check prerequisites: Before starting the first-project guide, install Kiro, sign in and have a project ready.
- Review generated tasks: The guide recommends reviewing the tasks in “tasks.md” before executing them.
- Check generated work: Review important changes and test them before relying on them in a live project.
- Keep sensitive values private: Do not paste passwords, private keys or other sensitive information into a prompt.
Real World Case Studies
Dhan: The company developed the capability with one developer in 2 months, a project it estimates would previously have required up to 20 developers and 2 years.
Rehrig Pacific: The team said it had delivered work it expected to take roughly 3 years in the last 7 weeks with a single developer and was expanding the impact and velocity for the rest of its resources.
Amazon Bedrock team: The team shipped approximately 100,000 lines of new Rust code in 76 days.
These results come from vendor-published case studies, and results for individuals may be more modest.
Similar Tools
- GitHub Copilot: Choose GitHub Copilot if you want code suggestions as you type to speed up routine work.
Quick Start Checklist
- Install and sign in: Before starting, ensure Kiro is installed and you are signed in with your Kiro account.
- Open a project: Have a project to work with, either an existing project or a new one.
- Generate steering documents: Choose Generate Steering Docs from the Kiro panel.
- Start a spec: Start a spec from a chat session or the Specs section, then enter a feature description.
- Review the plan: Read the proposed requirements, design and tasks before asking an agent to carry out the work.
Frequently Asked Questions
Does Kiro share project configuration across its surfaces?
Yes. The .kiro project configuration is shared across Kiro surfaces.
Can I use Kiro from another editor?
Because Kiro uses the standard ACP, compatible editors such as JetBrains IDEs and Zed can use Kiro as their agent too.
Can a cloud session continue after I close my laptop?
Yes. Kiro says cloud sessions keep running after you close your laptop, and you can check on them from your phone.
Can hooks automate test-file updates?
Kiro’s getting-started guide includes an example hook: when the agent saves a React component file, it creates or updates the matching test file.
When to Choose Another Tool
- Cursor: Choose Cursor if project-wide context for changes across several files is the priority.
- GitHub Copilot: GitHub Copilot suggests code as you type.
Summary
The IDE, CLI, Web and Mobile connect to the same shared agent harness.
Kiro turns prompts into requirements, architectural designs, and sequenced tasks, then implements them with parallel agents.
Last checked: October 2026
