session-metrics

centminmod / claude-plugins

Site: https://ai.georgeliu.com/p/my-claude-code-plugin-marketplace

A personal Claude Code plugin marketplace. Each plugin is an independent, standalone unit that can be installed into any Claude Code project with a single command.

Claude Code's plugin system supports multiple plugins per marketplace and handles install + update lifecycle automatically. See the official plugin-marketplaces docs for the broader ecosystem.

Install the marketplace

Add this marketplace once, then install any plugin from it:

Run /plugin commands inside the Claude Code terminal CLI (claude in your shell). They are not recognised in the desktop app, claude.ai/code, or IDE extensions — you'll see "/plugin isn't a recognized command here" if you try. Installed plugins then work from every surface; only the install step requires the CLI.

/plugin marketplace add centminmod/claude-plugins

Available plugins

Plugin	Description	Install
session-metrics	Per-turn token, cost, and cache metrics for Claude Code sessions. Multi-format export (text/JSON/CSV/MD/HTML) with 5-hour session blocks, weekly roll-up, hour-of-day punchcard, and pluggable chart libraries.	/plugin install session-metrics@centminmod

More plugins coming.

Further reading — session-metrics

Background articles by the author on what the skill does and what it surfaces in practice:

• My Claude Code Plugin Marketplace Is Now Public. Install Session Metrics Skill Plugin.
• I built a token-cost analyzer skill for Claude Code — how the skill was designed and what it reports.
• I ran two Claude Opus 4.7 5-hour sessions — real-world session-metrics output from two back-to-back Opus 4.7 sessions, with cache-hit, cost, and token-usage analysis.

How the skill gets triggered

Plugin skills are namespaced as plugin-name:skill-name — for example /session-metrics:session-metrics. In practice you rarely type that form: each skill declares natural-language triggers in its SKILL.md, so Claude Code auto-invokes the right one when you ask something like "how much has this session cost?".

Licences

• Marketplace scaffold: MIT (see LICENSE).
• Each plugin under plugins/*/ carries its own LICENSE and may bundle third-party assets under their upstream licences. For session-metrics specifically, the default Highcharts renderer ships under a non-commercial-free licence — commercial use requires a paid Highsoft licence. MIT-licensed alternatives (uPlot, Chart.js) are selectable via the --chart-lib flag. See plugins/session-metrics/skills/session-metrics/scripts/vendor/charts/README.md for per-library LICENSE.txt files.

Contributing

This is a personal marketplace — issues and pull requests are welcome but plugin additions are curated. Feel free to open an issue to discuss bundling something new.

Related

• centminmod/my-claude-code-setup — personal Claude Code config template (bundles the same skills for direct copy)