Quick answer
Pick one primary coding assistant for your team. Run the same real bugfix on each finalist. Before any annual plan, verify four things: whether the plan trains on your code by default, whether admins can disable data sharing and repo plugins, what happens to indexed code when a seat leaves, and whether you can export or revoke access. Cisco's State of AI Security 2026 found that 83 percent of organizations plan to deploy agentic AI systems, but only 29 percent report feeling adequately prepared to secure them. This checklist closes that gap for coding tools specifically.
Why a team rollout needs more than a free trial
Individual developers adopting AI coding tools bottom-up is already happening — Claude Code reached an estimated $1 billion in run-rate revenue within six months of launch, and Cursor achieved a valuation near $10 billion in 2025. When a team adopts formally, the risks shift from personal productivity to organizational: proprietary source code leaving the building, inconsistent security postures across seats, and no offboarding plan when someone leaves.
The four questions you can't skip
- Does this plan train on your code by default? Business and enterprise tiers typically offer training opt-outs; free and pro tiers may not. Verify on the vendor's current documentation — policies have changed repeatedly through 2025 and 2026.
- Can admins disable sharing, retention, or repo plugins? Centralized governance means an administrator can turn off features that send code off without per-seat configuration. If every developer must self-manage these settings, someone will miss one.
- What happens when a seat leaves? When a developer departs, you need to know whether their indexed code, prompt history, and repository access can be revoked and exported. If the answer is unclear, treat that as a no.
- Can you export or revoke access to indexed code? Your codebase is an asset. If you can't get it back or cut access to it, you don't fully control it.
Documented vulnerabilities you should know about
AI coding tools accumulated significant documented CVEs through 2025 and 2026. Cursor had multiple issues including data exfiltration via remote JSON schema (CVE-2025-49150), remote code execution via settings overwrite (CVE-2025-54130), and MCP config rewrite via Slack (CVE-2025-54135). Claude Code had command injection (CVE-2025-54795, CVSS 8.7), malicious SessionStart hooks (CVE-2025-59536), and API key exfiltration via malicious base URLs (CVE-2026-21852). GitHub Copilot had auto-approve manipulation (CVE-2025-53773). Koi Security testing found Cursor in Auto Mode was vulnerable to 83.4 percent of tested attacks. These are not theoretical — they are patched or patching, but they demonstrate why admin controls and repo-scoping matter.
Repository instruction files are trust artifacts
Files like .cursorrules, CLAUDE.md, and .github/copilot-instructions.md tell AI coding tools how to behave in your repository. Treat them with the same review process as deployment configuration — a malicious or careless instruction file can change what the tool does with your code across every seat that opens the repo.
The same-bugfix evaluation protocol
- Choose one real bugfix or small feature from your actual backlog — not a demo todo app.
- Run it in Cursor, GitHub Copilot, and your current chat assistant on the plan you actually pay for.
- Score first-output acceptance rate (did the first suggestion work?) and edit burden (how much did you have to change?).
- Keep one primary tool. Keep a second only if it owns a different weekly job — for example, one for IDE completion and another for terminal agent work.
The keep-one rule for coding seats
If your team already pays for two coding surfaces, run the protocol above. Most teams find the two tools overlap by 80-90 percent. The budget freed by cutting the redundant seat usually pays for a higher tier on the primary tool, or for the Premium stack audit if you want a second opinion on the full picture. Research only; no implementation or account access.
Frequently asked questions
Does my team need a security review before adopting Cursor or Copilot?
Yes. At minimum verify training defaults, repo access controls, offboarding procedures, and whether admins can disable data sharing. Documented CVEs across Cursor, Copilot, and Claude Code in 2025-2026 show real attack surface that a basic review catches.
Can we run two coding assistants and keep both?
You can, but most teams overlap heavily. Run the same real bugfix on each tool, score acceptance and edit burden, then keep one primary. Keep a second only if it owns a genuinely different weekly job.
What are the actual vulnerabilities in AI coding tools?
Documented CVEs include Cursor data exfiltration, Claude Code command injection (CVSS 8.7), and Copilot auto-approve manipulation. Review official vendor advisories for current patch status — these are actively managed, not theoretical.