copilot-session-usage 0.1.0

Usage and cost analytics for GitHub Copilot and Copilot-CLI session logs

copilot-session-usage

Extract VS Code Copilot session cost KPIs (tokens, estimated USD, model, duration) from local debug logs.

Installation

uv tool install copilot-session-usage

Quick start

# Analyze the most recent session
copilot-session-usage latest

# Analyze a specific session by its debug-log directory
copilot-session-usage analyze /path/to/session/debug-logs

# List recent sessions (metadata only)
copilot-session-usage list

# Batch analyze the last 10 sessions
copilot-session-usage batch 10

Features

• Token-level cost estimation — per-model pricing with cache-hit discounts
• Multi-model sessions — correctly handles sessions that call multiple models (e.g. Claude + Kimi)
• Threshold-aware pricing — long-context tier switching (e.g. GPT-5.4 > 272k tokens)
• Subagent cost attribution — tracks runSubagent calls and their token usage
• Cross-platform — macOS, Linux, Windows, WSL2
• Three detail levels — minimal, compact, full
• JSON and table output — machine-readable or human-friendly

How it works

copilot-session-usage reads VS Code Copilot debug logs stored in ~/Library/Application Support/Code/User/workspaceStorage/ (macOS), %APPDATA%\Code\User\workspaceStorage\ (Windows), or ~/.config/Code/User/workspaceStorage/ (Linux).

Each session directory contains a GitHub.copilot-chat/debug-logs/ folder with JSONL files. The tool parses these files, extracts token counts per model, applies per-model pricing (including cache-hit discounts and long-context tier switching), and estimates the session cost in USD.

Subagent calls (runSubagent) are tracked separately so you can see how much token usage was delegated to helper agents.

Knowledge base

This project includes an OKF knowledge bundle in knowledge/ with structured guidelines for contributors. Validate it with:

just knowledge-validate

Usage

Commands

Command	Description
analyze PATH	Analyze one session by its debug-log directory
latest	Analyze the most recently modified session
find TITLE	Find and analyze a session by title (fuzzy match)
id SESSION_ID	Analyze a session by exact UUID
list	List recent sessions (metadata only, no cost)
batch N	Analyze the N most recent sessions in one pass

Global options

Option	Description
--workspace-storage PATH	Override workspaceStorage directory (auto-detected by default)
--agent {vscode,cli}	Provider to use (cli not yet implemented)
--detail {minimal,compact,full}	Detail level (default: compact)
--format {json,table,detailed}	Output format (default: table)
--output PATH	Write output to file instead of stdout

Examples

# Full detail for the latest session
$ copilot-session-usage latest --detail full
{
  "session_id": "f5cbde8a-ec40-466f-86e6-f95c343b6c58",
  "session_dir": "/Users/az02065/Library/Application Support/Code/User/workspaceStorage/c016ff4fabbe9f918719a00c9c741058/GitHub.copilot-chat/debug-logs/f5cbde8a-ec40-466f-86e6-f95c343b6c58",
  ...
}

# JSON output for a specific session
$ copilot-session-usage analyze /path/to/debug-logs --format json --output report.json

# Find sessions containing "refactor" in the title
$ copilot-session-usage find "refactor"
Multiple sessions match 'implem':
  2026-07-01T21:15:12Z  'Implement copilot-session-usage spec'  (id: c890dd60-43d6-44f0-b57c-ab505dfa003b)
  2026-06-26T18:21:21Z  'Resume PRD implementation'  (id: 9368ab3e-1c93-4125-8271-d5bd024b057a)
  2026-06-26T09:19:52Z  'Resume Workflow PRD implementation'  (id: 1214eb3f-add0-41a5-84d4-88720218e60e)
...

# Get summary for a given session (found by `find`)
$ copilot-session-usage id 19e03be0-9cfa-4f21-a19a-4bdb754b3965 --format table
Session:   19e03be0-9cfa-4f21-a19a-4bdb754b3965
Title:     Implementation of new feature X
Started:   2026-07-01T20:37:34Z
Duration:  40588s  (active: 1083s)
Models:    claude-sonnet-4.6, claude-haiku-4.5, Kimi-K2.6-azure
Input:     1,425,790 tokens
Output:    22,166 tokens
Cached:    1,224,340 (86%)
LLM calls: 28
Est. cost: $1.0880

# Batch analyze last 5 sessions since July 1st
copilot-session-usage batch 5 --since 2026-07-01

# WSL2: point to Windows host workspaceStorage
copilot-session-usage latest \
  --workspace-storage /mnt/c/Users/$USER/AppData/Roaming/Code/User/workspaceStorage

Python API

from copilot_session_usage.api import analyze_session, analyze_latest, batch_analyze

# Analyze a session by path
result = analyze_session(Path("/path/to/debug-logs"), detail="full")

# Analyze the most recent session
result = analyze_latest(detail="compact")

# Batch analyze the last 10 sessions
batch = batch_analyze(10, detail="minimal")

Development

# Install dependencies
just dev

# Run tests
just test

# Run full validation
just preflight

# Build docs
just docs

# Serve docs with auto-reload
just docs-serve

License

MIT — see LICENSE.