B — Some risk signals Graded October 16, 2026Minor concerns worth a quick check.Based on public adoption and transparency signals as of October 16, 2026. Our opinion, not a code audit or security guarantee.
AI agent skill · Developer tools, Web & browsing
claude-skills
380 Claude Code skills & agent skills & plugins (30+ Agents, 70+ custom commands, 380+ skills, customizable references, scripts)for Claude Code, Codex, Gemini CLI, Cursor, and 8 more coding agents — engineering, marketing, product, compliance, C-level advisory, research, business operations, commercial & finance, and your daily productivity skills.
Bottom line: Signal-based grade (5/7 points): very widely starred on GitHub, listed in several sources, public source code. This reflects adoption and transparency, not a code review.
- Popularity score
- 56/100
- Rank
- #45 of 500
- GitHub stars
- 28.3k
What it does
claude-skills provides a curated collection of 380+ pre-built skills and agent plugins designed for Claude Code and other AI coding agents, spanning domains like engineering, marketing, compliance, and finance. It includes 30+ ready-made agents, 70+ custom commands, and customizable reference scripts to extend agent capabilities across productivity and business operations.
Who it’s for
Engineering teams, product managers, and C-level executives looking to accelerate AI agent deployment with domain-specific skills. Builders using Claude Code, Cursor, Gemini CLI, or similar coding agents who want to avoid building common capabilities from scratch.
Copy-paste setup
Check these steps against the project’s own instructions before running anything.
Follow the setup steps in the project’s official README: https://github.com/alirezarezvani/claude-skills (opens external site)
Risks
- Credential scope creep: 380+ skills may expose overly-permissive API credentials or system access if not individually scoped; audit which skills request what permissions.
- Prompt injection via skill chaining: Complex multi-agent workflows with custom commands increase surface area for indirect prompt injection attacks.
- Supply chain risk: Large skill libraries centralize trust in a single maintainer; forked or vendored code can drift from upstream security patches.
- Data exfiltration via plugins: Business-operations and finance skills may process sensitive data (budgets, PII, financial records); verify data handling and storage policies.
- Unvetted third-party integrations: 70+ custom commands may wrap external APIs without clear security audits; review integrations before production use.
How to stay secure
Least-privilege permissions
- Audit each skill's required permissions in claude-skills configuration; disable or remove unused skills to reduce attack surface.
- Use separate API credentials per skill category (engineering, finance, compliance) rather than shared master tokens; rotate credentials monthly.
- Implement IAM policies that grant skills only the minimum resource access needed (e.g., read-only finance access, no delete permissions for operational data).
- Require explicit approval workflows for skills accessing sensitive domains (PII, financial records, compliance data) before execution.
Network isolation
- Run claude-skills agent in a sandboxed environment or container with egress filtering; whitelist only required external API endpoints per skill.
- Enforce mutual TLS (mTLS) authentication for all skill-to-service communications; validate certificates on both ends.
- Segment skill execution by trust tier: isolate high-risk skills (third-party integrations) on separate network segments from core business systems.
- Log all outbound connections from agent processes; block unexpected domains to prevent exfiltration via unvetted plugins.
Monitoring
- Instrument each skill invocation with request/response logging (inputs, outputs, permissions used); alert on unusual patterns or high-volume data transfers.
- Monitor for prompt injection indicators: detect when skill chaining produces unexpected command sequences or attempts to access out-of-scope resources.
- Track skill library updates and diff against upstream; alert if vendored code diverges from security patches or shows signs of tampering.
- Audit IAM token usage per skill; flag if credentials are used from unexpected locations or with abnormal request patterns.
Red flags to watch for
- A single skill requesting broad permissions (e.g., "admin" or "unrestricted API access"); require re-scoping or deactivation.
- Custom commands or multi-agent workflows that chain skills in ways not documented in threat modeling; review compositions before deployment.
- Finance or compliance skills processing data to unfamiliar external APIs or storage buckets; verify data residency and retention policies.
- Supply chain alerts: upstream skill library updates that don't include security release notes, or forks with stale dependency versions.
Alternatives
- Anthropic's official Agent Kit — First-party skills library; smaller, more conservative scope and audit.
- OpenAI Custom GPTs / Actions — Native integration for GPT-4; strengths in UI/UX, weaker on multi-agent orchestration.
- LangChain / LlamaIndex Tool Libraries — Framework-agnostic, composable, but require more manual skill integration and testing.
- Cursor built-in skills — Lightweight, integrated IDE experience; limited cross-domain coverage compared to claude-skills.