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Best AI agent to check an AI skill or prompt for prompt injection before you use it
Before you install a downloaded skill, Bot template, MCP server or long prompt, have a separate AI session read every file and flag hidden instructions, data grabs, outside commands and anything that doesn't match what it claims to do. You decide whether to install it. Here are 5 agents that can do it, with prices we checked on each vendor's own page.
Quick answer
- 5 agents compared, all with verified prices.
- Free plan available: Cursor, Gemini CLI, Cline.
- We don't rank them. Pick by price, where it runs and the setup steps on each agent's page.
| Agent | What it does | Price (verified) | Free plan | Works on |
|---|---|---|---|---|
| Claude Code | Builds and fixes software from plain-English requests in terminal/IDE/web | $20/mo ($17/mo annual)checked Oct 18, 2026 | No | CLI, IDE, web |
| Cursor | Agent edits code, runs commands, background agents open PRs | $0 (Plus $8/mo, Grok models only; Premium $30/mo)checked Oct 16, 2026 | Yes | macOS, Windows, Linux, web |
| Gemini CLI | Open-source terminal agent for code and tasks | Free (open source, Apache-2.0); you pay for the AI model you connectchecked Oct 14, 2026 | Yes | CLI |
| Cline | Open-source IDE agent | Free (open source) for individuals; pay for AI usage or bring your own key; Enterprise customchecked Oct 14, 2026 | Yes | VS Code, JetBrains |
| Grok Bot | Runs on its own cloud computer: browses, handles email, files, routines and scheduled tasks while you're away | Premium $30/mo (Super $100/mo, Ultra $200/mo; Teams $30+/user/mo; Enterprise custom). Not in Free or Plus ($8)checked Oct 18, 2026 | No | Web, iOS, Android, desktop |
Also able to do this, but we haven't confirmed the price yet: Codex.
FAQ
- What is the best AI agent to check an AI skill or prompt for prompt injection before you use it?
- We compare 5 agents with verified prices that can check an AI skill or prompt for prompt injection before you use it. We do not rank a single winner — pick by price, free plan and where it runs.
- Which AI agents to check an AI skill or prompt for prompt injection before you use it have verified prices?
- Claude Code: $20/mo ($17/mo annual); Cursor: $0 (Plus $8/mo, Grok models only; Premium $30/mo); Gemini CLI: Free (open source, Apache-2.0); you pay for the AI model you connect; Cline: Free (open source) for individuals; pay for AI usage or bring your own key; Enterprise custom; Grok Bot: Premium $30/mo (Super $100/mo, Ultra $200/mo; Teams $30+/user/mo; Enterprise custom). Not in Free or Plus ($8).
- Is there a free plan among the best AI agents to check an AI skill or prompt for prompt injection before you use it?
- Yes: Cursor, Gemini CLI, Cline.
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