context-window-statusline

name	context-window-statusline
description	This skill should be used when the user asks to "set up a status line", "configure the footer", "show context window usage", "add a statusline", "visualize context window", "customize the Claude Code footer", or wants to display token counts, cost, or session metrics in the Claude Code terminal footer.
user-invocable	true

Context Window Status Line

Generate and install a customizable status line (footer bar) for Claude Code that visualizes context window usage, token counts, session cost, and more.

What It Does

The status line displays a real-time dashboard at the bottom of the Claude Code terminal:

Opus 4.6 │ ████████░░░░░░░░░░░░ 42% (85.3kin 12.1kout cached:45.2k) of 200k
💰 $0.1234 │ ⏱  5m23s (api: 2m10s) │ +142 -37

Installation

Step 1: Copy the script

Copy scripts/statusline.sh to ~/.claude/statusline.sh and make it executable:

cp scripts/statusline.sh ~/.claude/statusline.sh
chmod +x ~/.claude/statusline.sh

Step 2: Configure settings.json

Add to ~/.claude/settings.json:

{
  "statusLine": {
    "type": "command",
    "command": "~/.claude/statusline.sh",
    "padding": 1
  }
}

The padding field adds blank lines around the status bar (0 = no padding, 1 = one line above and below).

Available JSON Data

The script receives session data as JSON via stdin. Extract fields with jq:

Model Information

Field	Description
model.display_name	Current model name (e.g. "Opus 4.6")

Context Window

Field	Description
context_window.used_percentage	Percentage of context used (0-100)
context_window.remaining_percentage	Percentage remaining
context_window.context_window_size	Total window size in tokens
context_window.current_usage.input_tokens	Input tokens consumed
context_window.current_usage.output_tokens	Output tokens generated
context_window.current_usage.cache_read_input_tokens	Tokens read from cache
context_window.current_usage.cache_creation_input_tokens	Tokens written to cache

Cost & Performance

Field	Description
cost.total_cost_usd	Total session cost in USD
cost.total_duration_ms	Total session wall time
cost.total_api_duration_ms	Time spent in API calls
cost.total_lines_added	Lines of code added
cost.total_lines_removed	Lines of code removed

Customization

Minimal version (context bar only)

To display only the context window bar, remove line 2 from the script output. Keep only the printf that renders the model name, progress bar, and token counts.

Color thresholds

Adjust the percentage thresholds in the color-selection block:

• Green: < 40% — plenty of room
• Cyan: < 70% — getting warm
• Yellow: < 90% — watch out
• Red: >= 90% — near compaction

Bar width

Change BAR_WIDTH=20 to any value. Wider bars give more granularity.

Adding custom sections

Extend the script by reading additional JSON fields or injecting external data (git branch, active timers, etc.) into the output lines.

Bundled Script

The ready-to-use script is at scripts/statusline.sh. It includes:

• Color-coded context window progress bar (20 chars wide)
• Token count formatting (auto-scales to k/M)
• Duration formatting (seconds/minutes/hours)
• Cost display with 4 decimal precision
• Lines added/removed counters

Troubleshooting

• No output: Verify jq is installed (brew install jq)
• Garbled colors: Ensure terminal supports ANSI escape codes
• Script not found: Use absolute path or ~ in the command field
• Slow updates: The script runs on each render cycle; keep it fast (avoid network calls)