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 agentmods add skills/matthewdigiuseppe/mstack/mstack-upgradenpx skills add matthewdigiuseppe/MStack --skill mstack-upgradegit clone --depth 1 https://github.com/matthewdigiuseppe/MStackWhat 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 | $0.00033 | $0.00368 |
| Opus 5 | $0.00016 | $0.00184 |
| Sonnet 5 | $0.00007 | $0.00074 |
| Haiku 4.5 | $0.00003 | $0.00037 |
Grade A, and why
mstack-upgrade 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 2d 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
/mstack:mstack-upgrade
Stage: power Voice: maintenance
Procedure
-
Detect the install mode. Check whether
${CLAUDE_PLUGIN_ROOT}/.gitexists. -
Git-clone install (power users who ran
./setup): runbash "${CLAUDE_PLUGIN_ROOT}/bin/mstack-upgrade"— it pulls--ff-onlyand re-runs setup. Capture stdout/stderr and summarize: previous version → new version, skills added/removed/changed. -
Marketplace install (no
.git— the plugin lives in Claude Code's plugin cache, which is a managed copy, not a repo): do not attemptgit pull; it cannot work there. Tell the user to run:/plugin marketplace update mstackand restart Claude Code afterward so re-loaded skills take effect.
Outputs
- Summary block: install mode detected, previous version → new version (from
.claude-plugin/plugin.json), and a restart reminder if skills changed.
Anti-patterns to refuse
- Upgrading mid-paper without warning. If a paper folder is in active use, surface the changeset before the upgrade so the user can opt in.
git pullin the plugin cache. A marketplace install is not a checkout; the only supported update path is/plugin marketplace update.
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.
- 2d ago First seen · 43 lines · 33 tokens per session scan A 669b8fb524c7
mstack-upgrade is a skill published in the GitHub repository matthewdigiuseppe/MStack (14 stars, last pushed 6d ago), licensed MIT. It adds 33 tokens to every session and 368 once invoked, about $0.0002 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 2026-08-30.
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