Kiro CLI v3（Early Access）のQuick Specを試してみた

kiro-cli --v3

               Welcome to the new Kiro CLI UX! /feedback for thoughts.
           Prefer the classic experience? Relaunch with kiro-cli --classic.

Default · Claude Opus 4.6 · High · ◔ 1%

> /spec new hello1

Is this a new feature or a bugfix?

  Build a Feature
  Fix a Bug
❯ Quick Spec

What should "hello1" do?

❯ Hello World CLI app
  Hello World Web app
  Something else
  Skip questions

What programming language would you like to use for this CLI app?

  TypeScript
❯ Python
  Go
  Skip remaining questions

Should the CLI accept a user's name as input to personalize the greeting, or just
print a fixed "Hello, World!" message?

  Fixed greeting only
  Accept a name argument
❯ Both (default + optional name)

Invoke Agent requires approval
subagent → fast-task-workflow

  Allow
❯ Always allow
  Deny
  Always deny

⚠ 1 tool approval pending from subagents

  (a) Approve all pending
❯ (f) Approve all pending and auto-approve all future requests
  (c) Configure individually (agent monitor)
  (x) Exit (cancel subagents)

Now I'll generate the requirements, design, and tasks documents.
Requirements generated. Now generating the design document.
Design generated. Now generating the task list.

Here's the plan for hello1:

Implementation:

- Create hello.py — a single Python file that prints "Hello, World!" with no args,
  "Hello, <name>!" with one arg, and shows a usage error on 2+ args.

Optional tests:

- Property test: any name produces the correct personalized greeting with exit 0
- Property test: 2+ arguments always trigger stderr + non-zero exit
- Unit tests for all three cases (no arg, one arg, too many args)

Final step: Verify all tests pass.

The core implementation is a single file with no external dependencies.

Here's your task plan. Want to adjust anything?

❯ Ready to execute the tasks?
  I'd like to change something

### Requirement 1: Default Greeting
- WHEN no Name Argument is provided, THE CLI SHALL print "Hello, World!" to standard output.
- WHEN no Name Argument is provided, THE CLI SHALL exit with a zero exit code.

### Requirement 2: Personalized Greeting
- WHEN a Name Argument is provided, THE CLI SHALL print "Hello, <name>!" to standard output.
- WHEN a Name Argument is provided, THE CLI SHALL exit with a zero exit code.

### Requirement 3: Single Positional Argument
- THE CLI SHALL accept zero or one positional command-line argument.
- IF more than one positional argument is provided, THEN THE CLI SHALL display a usage
  error message to standard error and exit with a non-zero exit code.

sys.argv → validate arg count → branch:
  - 0 extra args → print "Hello, World!" → exit 0
  - 1 extra arg  → print "Hello, {name}!" → exit 0
  - 2+ extra args → print usage error to stderr → exit 1

- [ ] 1.1 Create hello.py with argument parsing and greeting logic
    - _Requirements: 1.1, 1.2, 2.1, 2.2, 3.1, 3.2_
- [ ]* 1.2 Write property test for personalized greeting format
- [ ]* 1.3 Write property test for excess arguments error
- [ ]* 1.4 Write unit tests for default and personalized greetings
- [ ] 2. Final checkpoint — Ensure all tests pass

> tasks.md のタスク 1.1 を実行して

タスク 1.1 完了です。hello.py をワークスペースルートに作成しました：

import sys

def main():
    args = sys.argv[1:]
    if len(args) > 1:
        print("Usage: python hello.py [name]", file=sys.stderr)
        sys.exit(1)
    name = args[0] if args else "World"
    print(f"Hello, {name}!")

if __name__ == "__main__":
    main()

動作確認済み：

- python hello.py → Hello, World! (exit 0)
- python hello.py Alice → Hello, Alice! (exit 0)
- python hello.py a b → usage error on stderr (exit 1)