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/kyleve/stuff/update-mainnpx skills add kyleve/Stuff --skill update-maingit clone --depth 1 https://github.com/kyleve/StuffWhat 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 | $0.00053 | $0.00358 |
| Opus 5 | $0.00026 | $0.00179 |
| Sonnet 5 | $0.00011 | $0.00072 |
| Haiku 4.5 | $0.00005 | $0.00036 |
Grade A, and why
update-main 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 yesterday.
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
Update Main
Update only an ordinary checkout's main branch through the repository-owned
./worktree --update-main command.
-
Resolve and enter the checkout root with
git rev-parse --show-toplevel. -
Read the absolute Git directory and common Git directory:
git rev-parse --absolute-git-dir git rev-parse --path-format=absolute --git-common-dirRefuse to continue when they differ. That identifies a linked worktree; direct the user to its Update to latest main environment action instead.
-
Require
git branch --show-currentto equalmain. Refuse detached HEADs and other branches rather than moving them. -
Require
git status --porcelainto be empty. Report the changed paths and stop when the checkout has local changes. -
Record
git rev-parse --short=8 HEAD, then run./worktree --update-mainfrom the checkout root. Do not replace it withgit pull, a merge, or a rebase: the script owns fetching, ancestry checks, and the fast-forward-only update. -
Report whether the checkout was already current or the old and new short commit IDs. Preserve and surface any refusal from the script.
Never commit, push, stash, discard changes, or switch branches as part of this skill.
What ships with it
1 file 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.
- yesterday First seen · 34 lines · 53 tokens per session scan A d23a49bb2cb1
update-main is a skill published in the GitHub repository kyleve/Stuff (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 53 tokens to every session and 358 once invoked, about $0.0003 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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