A fast, zero-dependency CLI cost calculator, tool analytics, and customizable statusline for Claude Code. Breakdowns by model, day, project, and branch. Single binary, no runtime needed.

Table of Contents

• Installation
• Usage
• Claude Code Statusline
• Session Exit Hook
• Tool & Skill Analytics
• Configuration
• Flags
• Preserving Log History

Installation

Homebrew (macOS / Linux)

brew install backstabslash/tap/goccc

Go install

go install github.com/backstabslash/goccc@latest

Pre-built binaries

Available on the releases page for macOS, Linux, and Windows (amd64 / arm64).

From source

git clone https://github.com/backstabslash/goccc.git && cd goccc
go build -o goccc .     # macOS / Linux
go build -o goccc.exe . # Windows

Usage

goccc                              # Summary of all-time usage
goccc -days 7 -all                 # Last 7 days with daily and project breakdowns
goccc -daily                       # Daily breakdown only
goccc -monthly                     # Monthly breakdown
goccc -projects                    # Project breakdown only
goccc -project webapp -daily       # Filter by project name (substring match)
goccc -days 1                      # Today's usage
goccc -projects -top 5             # Top 5 most expensive projects
goccc -days 30 -all -json          # JSON output for scripting
goccc -json | jq '.summary.total_cost'  # Pipe to jq for custom analysis
goccc -currency-symbol "€" -currency-rate 0.92  # One-off currency override
goccc -tools -days 30             # Tool & skill usage analytics
goccc -tools -project myapp -json # Tool analytics filtered by project, as JSON

Claude Code Statusline

goccc can serve as a Claude Code statusline — a fully customizable, live cost dashboard right in your terminal prompt.

💸 $1.23 session · 💰 $5.67 today · 💭 45% ctx · 🔌 2 MCPs (confluence, jira) · 🔋 94% (1.5/5h) · 🤖 Opus 4.6

• 💸 Session cost — parsed from the current session's JSONL files using goccc's pricing table
• 💰 Today's total — aggregated across all sessions today (shown only when higher than session cost)
• 💭 Context % — context window usage percentage
• 🔌 MCPs — active MCP servers (from settings, marketplace plugins, and project config; respects per-project disables)
• 🔋 5h / 7d window — remaining percentage of the usage window with elapsed time (subscription users only; hidden for API billing). Emoji switches to 🪫 below 25%
• 🤖 Model — current model

Values are color-coded: cost and context turn yellow → red as they increase; rate limit windows are inverted — yellow below 50%, red below 25% remaining.

Setup

Add to ~/.claude/settings.json:

{
  "statusLine": {
    "type": "command",
    "command": "goccc -statusline"
  }
}

Works with any install method. To run without installing: go run github.com/backstabslash/goccc@latest -statusline.

Customization

The statusline is fully customizable via ~/.goccc.json. With no config, you get the default layout shown above.

{
  "statusline": {
    "segments": ["session_cost", "today_cost", "ctx", "model", "|", "5h", "cwd", "branch"],
    "separator": " · ",
    "segment_options": {
      "session_cost": { "emoji": "🤑", "label": "sess" },
      "today_cost": { "label": "day" },
      "ctx": { "emoji": "🧠", "label": "context" },
      "5h": { "emoji": "⏳" },
      "branch": { "emoji": "🔀" }
    }
  }
}

segments — ordered list of segments to display. Only listed segments are shown; segments with no data auto-hide. "|" forces a line break.

The config above produces:

🤑 $1.23 sess · 💰 $5.67 day · 🧠 45% context · 🤖 Opus 4.6
⏳ 94% (1.5/5h) · 📁 my-project · 🔀 feature/auth

Available segments:

Segment	Default	Auto-hides when	Overrides
session_cost	💸 $X.XX session	cost is $0	emoji, label
today_cost	💰 $X.XX today	cost is $0	emoji, label
ctx	💭 XX% ctx	—	emoji, label
model	🤖 Model Name	—	emoji
mcp	🔌 N MCPs (...)	no MCPs detected	emoji, label
branch	🌿 branch-name	no branch	emoji
5h	🔋 XX% (X/5h)	absent (API billing)	emoji
7d	🔋 XX% (X/7d)	absent (API billing)	emoji
tokens	📊 XK in / XK out	both zero	emoji
lines	📝 +N -N	both zero	emoji
duration	⏱️ Xm	zero	emoji
cwd	📁 dirname	empty	emoji
version	🏷️ X.Y.Z	empty	emoji

separator — string between segments (default: " · ").

segment_options — per-segment overrides. emoji replaces the default icon (for 5h/7d, replaces the dynamic 🔋/🪫). label replaces trailing text (only on segments marked above).

Session Exit Hook

goccc can show a cost summary when a Claude Code session ends — the feature users miss most since Anthropic removed it.

💸 $1.87 session (14 reqs, 23m) · 💰 $12.34 today · 🤖 Opus 4.6, Haiku 4.5

Add to ~/.claude/settings.json:

{
  "hooks": {
    "SessionEnd": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "goccc -session-end"
          }
        ]
      }
    ]
  }
}

The hook runs within Claude Code's 1.5-second timeout. If anything fails, it exits silently — it will never break session teardown.

Tool & Skill Analytics

The -tools flag shows how often each tool and skill was invoked across your sessions — useful for understanding your workflow patterns, auditing MCP tool usage, and spotting unused skills.

goccc -tools                    # All-time tool usage
goccc -tools -days 7            # Last 7 days
goccc -tools -project myapp     # Filter by project
goccc -tools -top 5             # Top 5 in each breakdown
goccc -tools -json              # JSON output for scripting

────────────────────────────────────────────────────────────────────────────────
  TOOL BREAKDOWN (3,960 total, 24 unique, 82 sessions)
────────────────────────────────────────────────────────────────────────────────
  Tool                                     Invocations     Errors     Projects
  ────────────────────────────────────────────────────────────────────────────
  Bash                                           1,373       5.1%           12
  Read                                           1,231       4.3%           13
  Edit                                             459       2.4%            9
  ...

────────────────────────────────────────────────────────────────────────────────
  AGENT BREAKDOWN (83 spawned, 5 unique, 33 sessions)
────────────────────────────────────────────────────────────────────────────────
  Agent Type                     Invocations    Avg Time     Total    Projects
  ────────────────────────────────────────────────────────────────────────────
  Explore                                 46      2m 39s     2h 2m           8
  general-purpose                         29       4m 8s        2h           6
  ...

────────────────────────────────────────────────────────────────────────────────
  SKILL BREAKDOWN (32 invocations, 13 unique, 24 sessions, 46 available)
────────────────────────────────────────────────────────────────────────────────
  Skill                                              Invocations      Projects
  ────────────────────────────────────────────────────────────────────────────
  superpowers:brainstorming                                   14             7
  review-diff                                                  1             1
  ...

  ⚠ 37 unused skills (0 invocations):
    update-config, create-prd, ...

Supports all the same filtering flags (-days, -project) and output modes (-json) as the cost report.

Configuration

All configuration lives in ~/.goccc.json. Every field is optional.

Key	Description
currency	ISO 4217 currency code (e.g. EUR, GBP, JPY). Rate auto-fetched and cached 24h
warn_threshold	Yellow color-coding threshold (default: $25, auto-scales with currency; custom values used as-is)
alert_threshold	Red color-coding threshold (default: $50, auto-scales with currency; custom values used as-is)
statusline	Statusline customization — segments, separator, per-segment overrides

Local Currency

Set "currency": "EUR" (or any ISO 4217 code) in ~/.goccc.json. goccc auto-fetches the exchange rate from USD and caches it for 24 hours. If the API is unreachable, the last cached rate is used. For one-off overrides without a config file, use -currency-symbol "€" -currency-rate 0.92 together.

JSON output always reports costs in USD, with a currency metadata object when a non-USD currency is active.

Flags

Flag	Short	Default	Description
-days	-d	0	Only show the last N calendar days (0 = all time)
-project	-p	—	Filter by project name (substring, case-insensitive)
-daily	—	false	Show daily breakdown
-monthly	-m	false	Show monthly breakdown (mutually exclusive with -daily)
-projects	—	false	Show per-project breakdown
-all	—	false	Show all breakdowns (daily + projects)
-top	-n	0	Max entries in breakdowns (0 = all)
-tools	—	false	Show tool and skill usage analytics
-json	—	false	Output as JSON
-no-color	—	false	Disable colored output (also respects NO_COLOR env)
-base-dir	—	~/.claude	Base directory for Claude Code data
-session-end	—	false	Session exit hook mode (reads SessionEnd JSON from stdin)
-statusline	—	false	Statusline mode for Claude Code (reads session JSON from stdin)
-currency-symbol	—	—	Override currency symbol (requires -currency-rate)
-currency-rate	—	0	Override exchange rate from USD (requires -currency-symbol)
-version	-V	—	Print version and exit

Preserving Log History

Claude Code periodically deletes old log files. To keep more history for cost tracking, increase the cleanup period in ~/.claude/settings.json:

{
  "cleanupPeriodDays": 365
}

The default is 30 days. Set it higher to retain more data for goccc to analyze.