`kiro-cli chat` (bun) consumes 80-130% CPU while idle

[aleck31]

Checks

• I have searched github.com/aws/amazon-q-developer-cli/issues and there are no duplicates of my issue
• I have run q doctor in the affected terminal session
• I have run q restart and replicated the issue again

Operating system

macOS 26.4.1 (25E253)

Expected behaviour

kiro-cli chat (bun process) should consume near 0% CPU when idle — i.e., when there are no active API calls, no tool executions, and no user input. An idle chat session waiting for user input should be event-driven, not busy-polling.

Actual behaviour

The bun process running kiro-cli chat consistently consumes 80-130% CPU even when completely idle. This causes rapid battery drain on laptops.

Sampled over 6 seconds while idle:
$ for i in 1 2 3; do ps -p -o pcpu=; sleep 2; done
82.1
128.5
111.4

Running multiple kiro-cli chat sessions compounds the issue — observed ~220% total CPU with 4 idle sessions.

Note: Both autocomplete and inline suggestions are disabled:

• kiro-cli settings autocomplete.disable → true
• kiro-cli inline status → disabled

Steps to reproduce

1. Open a terminal (tested with WezTerm and Tabby on macOS)
2. Run kiro-cli chat
3. Do nothing — leave it idle
4. Check CPU usage: ps -Arco pid,pcpu,comm | grep bun
5. Observe bun process at 80-130% CPU continuously

Environment

<This will be visible to anyone. Do not include personal or sensitive information>

[q-details]
version = "2.0.1"
hash = "4a41569da83e25b6ab94898d7c4c83fa18cb5216"
date = "2026-04-17T02:21:00.156808Z (7d ago)"
variant = "full"

[system-info]
os = "macOS 26.4.1 (25E253)"
chip = "Apple M4"
total-cores = 10
memory = "16.00 GB"

[environment]
cwd = "/Users/USER/playground"
cli-path = "/Users/USER/playground"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "Wezterm"
install-method = "unknown"

[env-vars]
PATH = "/Users/USER/.local/bin:/Users/USER/.toolbox/bin:/opt/homebrew/opt/python@3.13/libexec/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/pkg/env/active/bin:/opt/pmk/env/global/bin"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.github.wez.wezterm"