Claude Code status line to show real time cost, context and cache

statusline-command.sh

#!/bin/sh
# ~/.claude/statusline-command.sh
input=$(cat)

# --- model ---
model=$(echo "$input" | jq -r '.model.display_name // ""')

# --- folder ---
dir=$(echo "$input" | jq -r '.workspace.current_dir // .cwd // ""')
dir_name=$(basename "$dir")

# --- git branch ---
branch=""
if [ -d "${dir}/.git" ] || git -C "$dir" rev-parse --git-dir > /dev/null 2>&1; then
  branch=$(git -C "$dir" symbolic-ref --short HEAD 2>/dev/null || git -C "$dir" rev-parse --short HEAD 2>/dev/null)
fi

# --- session cost ---
cost=$(echo "$input" | jq -r '.cost.total_cost_usd // empty')
cost_str=""
[ -n "$cost" ] && cost_str=$(printf '$%.2f' "$cost")

# --- context window ---
used=$(echo "$input" | jq -r '.context_window.used_percentage // empty')
ctx_str=""
ctx_tokens_str=""
if [ -n "$used" ]; then
  used_int=$(printf "%.0f" "$used")
  ctx_str="${used_int}%"

  ctx_used=$(echo "$input" | jq -r '(.context_window.current_usage.cache_read_input_tokens + .context_window.current_usage.cache_creation_input_tokens + .context_window.current_usage.input_tokens + .context_window.current_usage.output_tokens) // empty' 2>/dev/null)
  ctx_total=$(echo "$input" | jq -r '.context_window.context_window_size // empty' 2>/dev/null)
  if [ -n "$ctx_used" ] && [ -n "$ctx_total" ]; then
    ctx_used_k=$(( ctx_used / 1000 ))
    ctx_total_k=$(( ctx_total / 1000 ))
    ctx_tokens_str="${ctx_used_k}k/${ctx_total_k}k"
  fi

  # auto-compact kicks in around 83-84% (16.5% buffer); suggest compacting before that
  if [ "$used_int" -ge 85 ]; then
    compact_str="compact now"
    compact_color="\033[38;2;255;85;85m"
  elif [ "$used_int" -ge 70 ]; then
    compact_str="compact now"
    compact_color="\033[38;2;255;193;7m"
  fi
fi

# --- cache TTL countdown (based on transcript file mtime) ---
CACHE_TTL=300
ttl_str=""
ttl_color=""
transcript_path=$(echo "$input" | jq -r '.transcript_path // empty')
if [ -n "$transcript_path" ] && [ -f "$transcript_path" ]; then
  last_mod=$(stat -f %m "$transcript_path" 2>/dev/null || stat -c %Y "$transcript_path" 2>/dev/null)
  now=$(date -u +%s)
  if [ -n "$last_mod" ]; then
    elapsed=$(( now - last_mod ))
    remaining=$(( CACHE_TTL - elapsed ))
    if [ "$remaining" -gt 0 ]; then
      mins=$(( remaining / 60 ))
      secs=$(( remaining % 60 ))
      ttl_str=$(printf "ttl %dm%02ds" "$mins" "$secs")
      if [ "$remaining" -le 60 ]; then
        ttl_color="\033[38;2;255;193;7m"
      else
        ttl_color="\033[38;2;156;162;175m"
      fi
    else
      ttl_str="cache expired"
      ttl_color="\033[38;2;255;85;85m"
    fi
  fi
fi

# --- assemble output ---
SEP="\033[90m • \033[0m"

# line 1: model | folder • branch
printf "\033[38;5;208m\033[1m%s\033[22m\033[0m" "$model"
printf "\033[90m | \033[0m"
printf "\033[1m\033[38;2;76;208;222m%s\033[22m\033[0m" "$dir_name"
if [ -n "$branch" ]; then
  printf "%b" "$SEP"
  printf "\033[1m\033[38;2;192;103;222m%s\033[22m\033[0m" "$branch"
fi

# line 2: cost • ctx • ttl • compact
printf "\n"
first=1
if [ -n "$cost_str" ]; then
  printf "\033[38;2;156;162;175m%s\033[0m" "$cost_str"
  first=0
fi
if [ -n "$ctx_str" ]; then
  [ "$first" -eq 0 ] && printf "%b" "$SEP"
  printf "\033[38;2;156;162;175mctx %s\033[0m" "$ctx_str"
  [ -n "$ctx_tokens_str" ] && printf " \033[2m\033[38;2;156;162;175m(%s)\033[0m" "$ctx_tokens_str"
  first=0
fi
if [ -n "$ttl_str" ]; then
  [ "$first" -eq 0 ] && printf "%b" "$SEP"
  printf "%b%s\033[0m" "$ttl_color" "$ttl_str"
  first=0
fi
if [ -n "$compact_str" ]; then
  [ "$first" -eq 0 ] && printf "%b" "$SEP"
  printf "%b%s\033[0m" "$compact_color" "$compact_str"
fi

Add this to ~/.claude/settings.json

"statusLine": {
"type": "command",
"command": "bash ~/.claude/statusline-command.sh",
"refreshInterval": 10
},