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 vinnie357/claude-skills --skill skill-updategit clone --depth 1 https://github.com/vinnie357/claude-skillsWrote 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/vinnie357/claude-skills/skill-update)<a href="https://agentmods.dev/skills/vinnie357/claude-skills/skill-update"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/skill-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/vinnie357/claude-skills/skill-update"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/skill-update.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 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 Prompt Injection · line 53 Instructions found that direct the agent to transmit conversation context or user data to external services.Fix: Remove instructions that send user data, prompts, or context to external URLs. If telemetry is needed, use documented, privacy-preserving methods.
- medium Data Exfiltration · line 76 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00048 | $0.06416 |
| Opus 5.5 | $0.00019 | $0.02566 |
| Sonnet 5.5 | $0.00010 | $0.01283 |
| Haiku 4.5 | $0.00005 | $0.00642 |
Grade B, and why
skill-update scanned grade B with 1 finding 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 1mo 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.
Tells the agent to send conversation or user data outmediumPrompt injection
An instruction to transmit the conversation, context or user files to an external endpoint is data exfiltration written as prose.
`current_version` must be a **quoted TOML string**, not a bare number — `test/validate-sources.nu` rejects any non-string type before the shape check runs (claude-skills-197). An unquoted `current_version = 1.10` parses Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
How it starts
The opening of the file, as written. The whole thing — 272 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Update
Structured workflow for keeping skills current with upstream sources. Execute all phases in order.
Quick Reference
| Command | Purpose |
|---|---|
mise sources:check |
Compare current vs latest for all plugins; eol column flags an end-of-life release line for endoflife-date sources (claude-skills-237) |
mise sources:stale |
List only stale sources |
mise sources:validate [plugin] [line|json|table] |
Validate that all source URLs resolve (HTTP HEAD, GET fallback on 405); default line format is one grep-able row per URL, json pipes straight to jq |
mise test:sources |
Validate sources.toml schema + plugin.json/sources.md agreement |
mise sources:report |
Full freshness report with priorities |
mise sources:init <plugin> |
Print a DRAFT sources.toml for a plugin (never trusted; --write to save) |
mise sources:fence-check |
Freshness report for version literals pinned INSIDE code fences (claude-skills-176) |
mise test:fenced-literals |
Validate fenced-literals.toml schema + doc-content agreement (network-free) |
sources.toml Schema
Each plugin's skills/sources.toml tracks upstream dependencies. See templates/sources.toml for the complete annotated template.
[meta] — three required keys: plugin (must equal plugin.json name), reviewed_at_plugin_version (the plugin.json version at the last ACTUAL sources review, or "unknown" — never advanced by a version-bump commit, only by a review), last_full_check (YYYY-MM-DD or "unknown").
| Field | Values | Required | Description |
|---|---|---|---|
skills |
list<string> |
yes | Skill DIRECTORY names covered by this source — a non-empty list, not a scalar |
name |
string | yes | Human-readable source identifier |
url |
string | yes unless check_method = "none" |
Primary source URL |
releases_url |
string | no | Release tracking URL |
check_method |
see table below | yes | How to query latest version |
github_repo |
owner/repo |
conditional | Required for github-releases |
hex_package |
string | conditional | Required for hex-pm |
crate_name |
string | conditional | Required for crates-io |
npm_package |
string | conditional | Required for npm (registry package name, @scope/name included) |
docker_image |
namespace/repository |
conditional | Required for docker-hub (e.g. library/node) |
docker_tag |
string | conditional | Optional for docker-hub (e.g. 13-slim) — when set, switches the check to the per-tag content digest of that exact pin instead of the newest tag's name (claude-skills-225); current_version then holds a sha256:<64 hex> digest, accepted by b3_version_shape only for entries that set this field |
eol_product |
string | conditional | Required for endoflife-date (the endoflife.date product slug, e.g. nodejs) |
current_version |
QUOTED shape-checked version string | unknown |
yes unless none |
The upstream version this skill content was last verified/documented against |
version_constraint |
pre-1.0 | semver | rolling | stable |
yes unless none |
Version stability model — NOT valid values for current_version itself; a rolling/stable source with no discrete version records current_version = "unknown" (the convention 117 of 119 rolling entries and 8 of 12 stable entries already follow) |
last_checked |
YYYY-MM-DD | unknown |
yes | Date of last check |
update_priority |
high | medium | low |
yes unless none |
Update urgency |
breaking_changes_likely |
bool | no | Minor bumps may break (default: false) |
private |
bool | no | true marks a source whose upstream repo is not publicly readable, so mise sources:validate reports its URLs as private instead of dead (default: false). See Private upstream repositories |
notes |
string | no in general, yes when check_method = "none" |
Free-form context |
What ships with it
11 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.
- fenced-literals.toml 30 KB
- references/update-checklist.md 6.5 KB
- references/version-check-methods.md 17 KB
- scripts/fence-freshness.nu 16 KB
- scripts/sources-check.nu 8.7 KB
- scripts/sources-init.nu 10 KB
- scripts/sources-lib.nu 34 KB
- scripts/sources-report.nu 10 KB
- scripts/sources-stale.nu 7.7 KB
- scripts/sources-validate-urls.nu 42 KB
- templates/sources.toml 11 KB
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.
- 1mo ago Changed · +1 lines b62ddf2e8df8
- 2mo ago First seen · 271 lines · 48 tokens per session scan B b1e11179515f
skill-update is a skill published in the GitHub repository vinnie357/claude-skills (27 stars, last pushed 14d ago), licensed MIT. It adds 48 tokens to every session and 6,416 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (tells the agent to send conversation or user data out). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
skill-update compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| skill-updatevinnie357/claude-skills | Skill | 27 | 14d ago | MIT | B | 48 | Claude Code |
| imagegenopenai/codex | Skill | 134k | today | Apache-2.0 | A | 113 | Codex |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 2d ago | MIT | A | 200 | Claude Code, Codex |
| playwright-climicrosoft/playwright | Skill | 100k | today | Apache-2.0 | A | 19 | Claude Code |
| browser-automationopenclaw/openclaw | Skill | 394k | today | MIT | A | 36 | Claude Code |
| systematic-debuggingobra/superpowers | Skill | 315k | 6d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |