pi-token-usage

A pi extension for lifetime token usage tracking and cost analytics across all sessions.

Pi already shows token usage per session. pi-token-usage adds a cross-session view so you can answer questions like:

• how much have I spent in total?
• which models cost me the most?
• what did I use today, this week, or this month?
• which projects and sessions are driving usage?

Features

• Lifetime totals — tokens, cost, and cache usage across all sessions
• Time rollups — today, last 7 days, last 30 days, and by month
• Per-model breakdown — usage grouped by provider/model
• Per-project breakdown — usage grouped by working directory
• Per-session breakdown — top sessions by cost
• Live footer status — today's project and total consumption in the footer
• Customizable footer — enable/disable it, choose metrics, style, separators, presets, or a full template override
• Fast refresh — clear cached scan results and rescan session files
• Simple commands — query usage directly from pi with /usage ...

Install

From npm:

pi install npm:pi-token-usage

Or from git:

pi install git:github.com/ladislas/pi-token-usage

Commands

/usage                 — summary: lifetime, this month, last 30d, last 7d, today
/usage models          — breakdown by provider/model
/usage days [N]        — daily rollup for last N days (default: 7)
/usage months          — monthly rollup
/usage sessions [N]    — top N sessions by cost (default: 20)
/usage projects        — breakdown by project
/usage footer                     — show footer config and available items
/usage footer on|off              — enable or disable the footer
/usage footer items …             — choose footer items to show
/usage footer preset <name>       — apply a footer ordering preset
/usage footer separator <text>    — set the footer separator
/usage footer style <name>        — set footer styling (`plain`, `muted`, `cost`)
/usage footer template <text>     — override the full footer with a template
/usage footer untemplate          — remove the footer template override
/usage footer vars                — show available template variables
/usage footer reset               — remove project footer config
/usage refresh         — clear cache and rescan session files
/usage help            — show command help

Aliases:

/usage ?
/usage --help

Example output

── Token Usage ──
Period         Input     Output   Cache R   Cache W   Cost
Lifetime       1.2M      94.3k    3.4M      210.0k    $12.48
This month     240.0k    18.2k    640.0k    42.0k     $2.11
Last 30 days   310.5k    24.8k    811.0k    58.0k     $2.87
Last 7 days    84.1k     7.1k     210.4k    12.0k     $0.76
Today          9.2k      802      21.3k     0         $0.08

You can then drill down with /usage models, /usage sessions, /usage projects, or /usage days 30.

Footer

By default, the extension adds a footer status with:

• today's current-project cost
• today's total cost across all projects

You can customize it per project:

/usage footer
/usage footer on
/usage footer off
/usage footer items projectTodayCost,totalTodayCost
/usage footer items projectTodayTokens,totalTodayTokens
/usage footer preset summary
/usage footer preset full
/usage footer separator |
/usage footer style muted
/usage footer style cost
/usage footer template [project: {projectToday.cost} · {projectToday.tokens} tok]   [total: {totalToday.cost} · {totalToday.tokens} tok]
/usage footer untemplate
/usage footer vars
/usage footer reset

Available footer items:

• projectTodayCost
• totalTodayCost
• projectTodayTokens
• totalTodayTokens
• projectTodaySummary — e.g. Proj today $1.23 / 42K tok
• totalTodaySummary — e.g. Total today $8.76 / 210K tok

Available presets:

• minimal
• costs
• tokens
• summary
• full

Styling modes:

• plain — no styling
• muted — uses pi theme dim styling, matching the default footer more closely
• cost — uses pi theme dim styling overall, with cost values colorized via the theme

Template variables use formatted values by default, with Raw variants for unformatted numbers.

Examples:

• {projectToday.cost} → $2.56
• {projectToday.costRaw} → 2.56
• {projectToday.tokens} → 3.5M
• {projectToday.tokensRaw} → 3521456
• {projectToday.summary} → $2.56 / 3.5M tok
• same shape also exists for totalToday

Exact prompt example:

/usage footer template [project: {projectToday.cost} · {projectToday.tokens} tok]   [total: {totalToday.cost} · {totalToday.tokens} tok]

Which renders like:

[project: $2.56 · 3.5M tok]   [total: $12.50 · 32.3M tok]

Project-specific footer settings are stored in:

<your-project>/.pi-token-usage.json

A global default config can also be placed at:

~/.pi/agent/.pi-token-usage.json

How it works

Pi stores session history as JSONL files under ~/.pi/agent/sessions/. Assistant messages include token usage and cost metadata. This extension scans those session files, extracts usage records, and aggregates them across multiple dimensions.

No external database or persistence file is required — your local pi session files are the source of truth.

Notes

• Data stays local; no external service is used
• Results depend on usage metadata being present in pi session files
• The first scan may take longer if you have a large session history
• /usage refresh clears the in-memory cache and rescans all session files

Requirements

• pi v0.55.0 or later

Development

npm install
npm test

License

MIT