Zylos is open-source infrastructure that gives an AI agent persistent memory, scheduled activity, communication channels, and the ability to maintain and extend itself. Individuals and teams use it with Claude Code or Codex through Telegram, Lark, or a web console. Its catalogue add-ons define settings, instructions, and skills for operating the agent.
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.
npx skills add zylos-ai/zylos-core --skill upgrade-claudegit clone --depth 1 https://github.com/zylos-ai/zylos-coreWrote 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/zylos-ai/zylos-core/upgrade-claude)<a href="https://agentmods.dev/skills/zylos-ai/zylos-core/upgrade-claude"><img src="https://agentmods.dev/badge/skills/zylos-ai/zylos-core/upgrade-claude/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/zylos-ai/zylos-core/upgrade-claude"><img src="https://agentmods.dev/badge/skills/zylos-ai/zylos-core/upgrade-claude.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Supply Chain · line 69 Remote code is downloaded and executed. This bypasses code review and could introduce malicious code.Fix: Avoid downloading and executing remote scripts. Use trusted packages from PyPI/npm. If remote fetch is required, verify checksums and use HTTPS.
- medium Rogue Agent · line 59 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 62 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00037 | $0.00636 |
| Opus 5 | $0.00018 | $0.00318 |
| Sonnet 5 | $0.00007 | $0.00127 |
| Haiku 4.5 | $0.00004 | $0.00064 |
Grade C, and why
upgrade-claude 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 12d 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.
3. **Upgrade**: Runs native installer (`curl -fsSL https://claude.ai/install.sh | bash`) Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
3. **Upgrade**: Runs native installer (`curl -fsSL https://claude.ai/install.sh | bash`) How it starts
The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Upgrade Claude Code Skill
Upgrade Claude Code to the latest version - sends /exit, waits for exit, upgrades, and lets activity-monitor restart.
When to Use
- User explicitly asks to upgrade Claude Code
- New Claude Code version is available
- Need to apply Claude Code updates
Pre-Upgrade Checklist
Before launching the upgrade script, complete these steps in order:
1. Stop background tasks
Check for running background agents (Task tool). If any are active, stop them to avoid orphaned work.
2. Sync memory
Update memory files (state.md, sessions/current.md, etc.) to preserve important context that would otherwise be lost on restart.
3. Write a session handoff summary
Write a brief message covering:
- What was being worked on (active tasks, user requests in progress)
- Current state (what's done, what's pending, any blockers)
- What the next session should pick up (if anything)
4. Send the handoff summary
Send the full handoff summary to the internal void channel via C4:
cat <<'EOF' | node ~/zylos/.claude/skills/comm-bridge/scripts/c4-send.js "void" "session-handoff"
<handoff summary>
EOF
The void channel is record-only: the message is stored in C4 conversation
history (so the upgraded session's startup hook, c4-session-init, includes
it in startup context) but is never delivered to any real channel or display
surface.
Do not send the full handoff summary to the active external user channel
(Telegram, Lark, Feishu, HXA, etc.). Handoff summaries are operational context
for the next agent session and may contain task state from outside the current
conversation. If the user is actively waiting, send only a short user-facing
notice to their current reply via path, without internal task inventory or
cross-channel context.
5. Launch the upgrade script
IMPORTANT: Must use nohup ... & pattern!
nohup node ~/zylos/.claude/skills/upgrade-claude/scripts/upgrade.js >> ~/zylos/logs/upgrade.log 2>&1 &
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 12d ago First seen · 71 lines · 37 tokens per session scan C e626529b0038
upgrade-claude is a skill published in the GitHub repository zylos-ai/zylos-core (1,151 stars, last pushed 2d ago), licensed MIT. It adds 37 tokens to every session and 636 once invoked, about $0.0002 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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