Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add gwittebolle/claude-carbon/plugin install claude-carbonWrote 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.
[](https://agentmods.dev/skills/gwittebolle/claude-carbon/carbon-update)<a href="https://agentmods.dev/skills/gwittebolle/claude-carbon/carbon-update"><img src="https://agentmods.dev/badge/skills/gwittebolle/claude-carbon/carbon-update/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.
<a href="https://agentmods.dev/skills/gwittebolle/claude-carbon/carbon-update"><img src="https://agentmods.dev/badge/skills/gwittebolle/claude-carbon/carbon-update.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00020 | $0.00589 |
| Opus 5 | $0.00010 | $0.00295 |
| Sonnet 5 | $0.00004 | $0.00118 |
| Haiku 4.5 | $0.00002 | $0.00059 |
Grade C, and why
carbon-update scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
echo " curl -fsSL https://raw.githubusercontent.com/gwittebolle/claude-carbon/main/install.sh | bash" Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
echo " curl -fsSL https://raw.githubusercontent.com/gwittebolle/claude-carbon/main/install.sh | bash" What it actually says
Run the following bash script exactly as written and present its output to the user. Do not paraphrase. It updates the user's claude-carbon install (dirty-safe git pull), refreshes setup, and re-prices stored sessions with the new factors.
#!/usr/bin/env bash
# Locate the install that is actually wired into the status line, then run its updater.
REPO_DIR=""
# Windows (Git Bash): CLAUDE_* variables and the paths stored in settings.json can
# arrive in the native "C:\Users\..." spelling, which bash cannot open. cygpath
# ships with Git for Windows; everywhere else this is the identity function.
ccp() {
case "${OSTYPE:-}" in msys*|cygwin*) ;; *) printf '%s' "$1"; return 0 ;; esac
case "$1" in
[A-Za-z]:[\\/]*|*\\*) cygpath -u "$1" 2>/dev/null || printf '%s' "$1" ;;
*) printf '%s' "$1" ;;
esac
}
SETTINGS="$(ccp "${CLAUDE_CONFIG_DIR:-$HOME/.claude}")/settings.json"
if command -v jq >/dev/null 2>&1 && [ -f "$SETTINGS" ]; then
SL_CMD="$(jq -r '.statusLine.command // empty' "$SETTINGS" 2>/dev/null)"
# statusLine.command stores a shell-escaped path: expand ~ and unescape spaces
SL_CMD="${SL_CMD//\\ / }"; SL_CMD="${SL_CMD/#\~/$HOME}"; SL_CMD="$(ccp "$SL_CMD")"
if [ -n "$SL_CMD" ] && [ -f "$SL_CMD" ]; then
REPO_DIR="$(cd "$(dirname "$SL_CMD")/.." 2>/dev/null && pwd)"
fi
fi
[ -z "$REPO_DIR" ] && [ -n "${CLAUDE_PLUGIN_ROOT:-}" ] && REPO_DIR="$(ccp "$CLAUDE_PLUGIN_ROOT")"
[ -z "$REPO_DIR" ] && REPO_DIR="$(ccp "${CLAUDE_CARBON_DIR:-$HOME/code/claude-carbon}")"
if [ -f "${REPO_DIR}/scripts/update.sh" ]; then
bash "${REPO_DIR}/scripts/update.sh"
else
echo "claude-carbon updater not found at ${REPO_DIR}/scripts/update.sh"
echo "Re-run the installer to update:"
echo " curl -fsSL https://raw.githubusercontent.com/gwittebolle/claude-carbon/main/install.sh | bash"
fi
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.
- 8d ago Changed · +10 lines d834e48e13bc
- 12d ago First seen · 32 lines · 20 tokens per session scan C 6cee09657fb6
carbon-update is a skill published in the GitHub repository gwittebolle/claude-carbon (193 stars, last pushed yesterday), licensed MIT. It adds 20 tokens to every session and 589 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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