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 cyrus-cai/claude-cobrain/plugin install claude-cobrainWrote 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/cyrus-cai/claude-cobrain/startstop)<a href="https://agentmods.dev/skills/cyrus-cai/claude-cobrain/startstop"><img src="https://agentmods.dev/badge/skills/cyrus-cai/claude-cobrain/startstop/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/cyrus-cai/claude-cobrain/startstop"><img src="https://agentmods.dev/badge/skills/cyrus-cai/claude-cobrain/startstop.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 | $0.00010 | $0.00212 |
| Opus 5 | $0.00005 | $0.00106 |
| Sonnet 5 | $0.00002 | $0.00042 |
| Haiku 4.5 | $0.00001 | $0.00021 |
Grade A, and why
startstop scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
startstop
Action is passed as context: start or stop.
Run the unified controller script in direct python3 mode (no LaunchAgent).
if [[ -n "${CLAUDE_PLUGIN_ROOT:-}" && -f "${CLAUDE_PLUGIN_ROOT}/scripts/control.sh" ]]; then
CONTROL_SCRIPT="${CLAUDE_PLUGIN_ROOT}/scripts/control.sh"
elif [[ -f "./plugin/scripts/control.sh" ]]; then
CONTROL_SCRIPT="./plugin/scripts/control.sh"
else
CONTROL_SCRIPT="$(ls -dt "$HOME"/.claude/plugins/cache/*/claude-cobrain/*/scripts/control.sh 2>/dev/null | head -1)"
fi
[[ -n "${CONTROL_SCRIPT:-}" && -f "$CONTROL_SCRIPT" ]] || { echo "control.sh not found. Run: /claude-cobrain:cobrain install"; exit 1; }
bash "$CONTROL_SCRIPT" "$ACTION"
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.
- 9d ago First seen · 24 lines · 10 tokens per session scan A 1fc9d0c87258
startstop is a skill published in the GitHub repository cyrus-cai/claude-cobrain (5 stars, last pushed 6mo ago), licensed MIT. It adds 10 tokens to every session and 212 once invoked, about $0.0001 per session on Opus 5. 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 2026-08-31.
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