context-usage

context-usage is a plugin for Claude Code from melodic-software/claude-code-plugins. Its token cost is not measured, scanned A, original, MIT.

A per-session monitor for an AI assistant's context window, the amount of conversation and task information it can keep available. It saves snapshots and shows notices when usage moves into a worse zone, with an optional marker after context compaction.

In plain words
What is it for?
Use it to inspect context status, record context-window figures, and receive zone or compaction notices during coding sessions.
Why use it?
It makes declining available context visible so the person can recognise when a long session may affect the assistant's work.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Use it to inspect context status, record context-window figures, and receive zone or compaction notices during coding sessions.

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Install in Claude Code
/plugin marketplace add melodic-software/claude-code-plugins
/plugin install context-usage
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/melodic-software/claude-code-plugins

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for context-usage

README.md
[![agentmods](https://agentmods.dev/badge/plugins/melodic-software/claude-code-plugins/context-usage/github.svg)](https://agentmods.dev/plugins/melodic-software/claude-code-plugins/context-usage)
Your own site
<a href="https://agentmods.dev/plugins/melodic-software/claude-code-plugins/context-usage"><img src="https://agentmods.dev/badge/plugins/melodic-software/claude-code-plugins/context-usage/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for context-usage

Your own site · 80×15
<a href="https://agentmods.dev/plugins/melodic-software/claude-code-plugins/context-usage"><img src="https://agentmods.dev/badge/plugins/melodic-software/claude-code-plugins/context-usage.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

context-usage scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/context-usage/.claude-plugin/plugin.json · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "name": "context-usage",
  "description": "Per-session context-window observability. A mod writes each session's context-window figures to a snapshot file and shows the person a toast and a transcript line when the context zone (light, moderate or heavy, from bands in zones.json) worsens; with model_notices on (off by default) it also tells Claude the zone at each crossing, approach and compaction. /context-usage prints status and toggles an optional band row. It answers a status tool. A PostCompact hook leaves a marker.",
  "author": {
    "name": "Melodic Software",
    "email": "[email protected]"
  },
  "version": "6.0.2",
  "license": "MIT",
  "keywords": [
    "context-window",
    "mod",
    "zones",
    "context-degradation",
    "session",
    "hooks",
    "skill"
  ],
  "metadata": {
    "category": "claude-code"
  },
  "userConfig": {
    "context_usage_hooks_enabled": {
      "type": "boolean",
      "title": "Zone notices and compaction marker",
      "description": "Runs the module's zone lines and toasts and the PostCompact marker hook. On by default; off, none of them acts. Snapshot writes continue either way.",
      "default": true
    },
    "model_notices": {
      "type": "boolean",
      "title": "Model notices",
      "description": "Sends Claude one line when the session enters a worse context zone, nears a boundary or passes a zones.json threshold, and restates the zone after a resume, reload or compaction (with no figures yet, says the reading is unavailable). Off by default; the rest of the plugin works either way.",
      "default": false
    },
    "zone_report_mode": {
      "type": "string",
      "title": "Zone report mode",
      "description": "Acts only with model_notices on. automatic (default) sends the lines to Claude; operator holds them in a turn a person typed and offers the person a ready-made prompt and a notice row when the turn ends. Headless, loop and schedule turns get automatic lines either way.",
      "def

Read the full file on GitHub · 65 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. today First seen · 65 lines scan A c029d9a3eba8

Subscribe to this mod's changes

context-usage is a plugin published in the GitHub repository melodic-software/claude-code-plugins (30 stars, last pushed today), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-11-14.

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