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 idan-yaron/claude-cowork-skills-toolkit/plugin install skills-toolkitWrote 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/idan-yaron/claude-cowork-skills-toolkit/skills-update)<a href="https://agentmods.dev/skills/idan-yaron/claude-cowork-skills-toolkit/skills-update"><img src="https://agentmods.dev/badge/skills/idan-yaron/claude-cowork-skills-toolkit/skills-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/idan-yaron/claude-cowork-skills-toolkit/skills-update"><img src="https://agentmods.dev/badge/skills/idan-yaron/claude-cowork-skills-toolkit/skills-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 | $0.00097 | $0.03538 |
| Opus 5 | $0.00048 | $0.01769 |
| Sonnet 5 | $0.00019 | $0.00708 |
| Haiku 4.5 | $0.00010 | $0.00354 |
Grade A, and why
skills-update 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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 366 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Update Skills from GitHub
Re-fetch the GitHub sources for plugins previously installed by skills-toolkit, detect what changed, and rebuild each plugin with fresh content. Cowork's "Save plugin" flow replaces each installed plugin in-place.
How it works
Every .plugin that /skills-load builds embeds its source URL in
plugin.json.repository and tags itself with "skills-toolkit" in
keywords. This command scans all installed plugins for that marker, reads
the repository URL, re-clones, diffs each SKILL.md by SHA256, and rebuilds
the plugin with the same name — so Save plugin replaces the installed version.
Because the source URL lives inside the installed plugin itself, updates work
across session restarts, VM reboots, and conversation compaction. No
/skills-load rerun needed.
VM constraints
- Bash runs in an isolated Linux VM — use for discovery, cloning, and ZIP building.
- Write tool bridges to the HOST filesystem.
- Host paths like
~/AppData/...don't exist inside the VM.
Step 1: Discover installed skills-toolkit plugins
bash "${CLAUDE_PLUGIN_ROOT}/skills/skills-update/scripts/discover-installed-plugins.sh"
Returns JSON array of {pluginName, repository, pluginRoot, manifestPath, keywords, skills: [{name, path, currentSha}]}.
If empty:
No skills-toolkit plugins found.
Run
/skills-load <github-url>to install skills first, then come back here to refresh them.
Then stop.
Step 2: Filter by arguments
Parse $ARGUMENTS:
- Empty or
--all→ keep all discovered plugins and skills - Skill names (space or comma separated) → filter each plugin's
skills[]to entries wherenamematches. Drop plugins with no matching skills.
If filter matches nothing: "No skills matched {args}. Found: {list of names}."
Step 3: Report the plan
Found {M} skills-toolkit plugins with {N} skills total. Re-fetching GitHub sources to check for updates…
Step 4: Re-fetch each unique source
Collect unique (repository, source.branch) pairs across all plugins —
different branches of the same repo need separate fetches. For each unique
pair, clone once and cache by that pair:
What ships with it
3 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 · 366 lines · 97 tokens per session scan A f3207f8efd9b
skills-update is a skill published in the GitHub repository idan-yaron/claude-cowork-skills-toolkit (5 stars, last pushed 5mo ago), licensed MIT. It adds 97 tokens to every session and 3,538 once invoked, about $0.0005 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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