Borrowing it
Nothing to install: this file belongs to pleaseai/claude-code-plugins. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/pleaseai/claude-code-plugins/main/.claude/commands/add-skill.mdgit clone --depth 1 https://github.com/pleaseai/claude-code-pluginsWrote 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/commands/pleaseai/claude-code-plugins/add-skill)<a href="https://agentmods.dev/commands/pleaseai/claude-code-plugins/add-skill"><img src="https://agentmods.dev/badge/commands/pleaseai/claude-code-plugins/add-skill/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/commands/pleaseai/claude-code-plugins/add-skill"><img src="https://agentmods.dev/badge/commands/pleaseai/claude-code-plugins/add-skill.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 | $0.00044 | $0.01775 |
| Opus 5.5 | $0.00018 | $0.00710 |
| Sonnet 5.5 | $0.00009 | $0.00355 |
| Haiku 4.5 | $0.00004 | $0.00178 |
Grade A, and why
add-skill 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 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.
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 — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add a skills.sh skill as a plugin to the marketplace.
Arguments: $ARGUMENTS (format: <plugin-name> <github-repo-url> [--skill <skill-name> [<skill-name2> ...]])
Examples:
/add-skill slack-agent https://github.com/vercel-labs/slack-agent-skill/add-skill slack-agent https://github.com/vercel-labs/slack-agent-skill --skill slack-agent/add-skill agent-skills https://github.com/vercel-labs/agent-skills --skill pr-review commit
Step 1 — Parse & Validate Input
Parse $ARGUMENTS to extract:
PLUGIN_NAME: first token (e.g.agent-skills)REPO_URL: second token (e.g.https://github.com/vercel-labs/agent-skills)SKILL_NAMES: all space-separated values after--skillflag until the end of arguments (e.g.pr-review commit→["pr-review", "commit"]). Defaults to[PLUGIN_NAME]if--skillis not provided.OWNER_REPO: short form of the URL (e.g.vercel-labs/agent-skills)
Validate:
- Both
PLUGIN_NAMEandREPO_URLare present. If not, stop and show:Usage: /add-skill <plugin-name> <github-repo-url> [--skill <skill-name> [<skill-name2> ...]] REPO_URLmatcheshttps://github.com/<owner>/<repo>. Normalize to<owner>/<repo>short form.PLUGIN_NAMEcontains only alphanumeric characters, hyphens, and underscores.- Each name in
SKILL_NAMEScontains only alphanumeric characters, hyphens, and underscores.
Check for conflicts:
plugins/<PLUGIN_NAME>/must NOT already existPLUGIN_NAMEmust NOT already be in.claude-plugin/marketplace.json
If either check fails, stop and report the conflict.
Step 2 — Install Skills inside Plugin Directory
Create the plugin directory and install each skill into it. Run the following for each name in SKILL_NAMES:
mkdir -p plugins/<PLUGIN_NAME>
(cd plugins/<PLUGIN_NAME> && bunx skills add <OWNER_REPO> --skill <SKILL_NAME> --agent 'universal' -y)
bunx skills add run from plugins/<PLUGIN_NAME>/ will:
- Install skill files to
plugins/<PLUGIN_NAME>/.agents/skills/<SKILL_NAME>/ - Append to (or create)
plugins/<PLUGIN_NAME>/skills-lock.jsonscoped to this plugin
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 First seen · 199 lines · 44 tokens per session scan A bd491f137c69
add-skill is a command published in the GitHub repository pleaseai/claude-code-plugins (16 stars, last pushed 5d ago), licensed MIT. It adds 44 tokens to every session and 1,775 once invoked, about $0.0002 per session on Opus 5.5. 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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