{}Best AI Code Security

NOTE · 18 SEP 2026

Six AI code security myths, checked against public sources

ANSWER FIRST

Most common assumptions about securing AI-generated code are half right. Guardrails do not replace scanning, not every tool names every assistant, free plans do include real scans, and npm v12 closes only one route for malicious packages. Each point below cites the page it comes from.

Editorial assessment · Compiled from vendor product, docs, pricing and marketplace pages · Rated October 2026

By Best AI Code Security reviewers · Published 18 September 2026

Buyers bring assumptions to a shortlist, and some of them come from how the category is marketed rather than from what vendors publish. This note takes six of them and checks each against public vendor pages, changelogs and standards, as reviewed in September 2026.

Myth 1: A guardrail on the agent replaces scanning at the pull request

Fact: every tool we score still scans code after it is written, and the vendors with the strongest agent controls also run SAST, SCA and secrets checks. Legit VibeGuard, for example, runs SAST and SCA in the IDE, and Legit's platform scans in source control and CI as well. The reason is practical: code also arrives from people, from other assistants and from fix agents, and the pull request is the one place every change passes through. Our lesson on pull request checks covers the three scans.

Source: Legit Security: VibeGuard · Reviewed Sep 2026

Myth 2: Every tool supports every assistant

Fact: vendor pages name different assistants. In our AI Coding Assistant Coverage Census, Cursor is named by 8 of 9 vendors, Claude Code by 7, GitHub Copilot by 7, Windsurf by 5, OpenAI Codex by 3 and Kiro by 2. A tool may work with an assistant it does not name, but the way to know is to ask for the documentation page that names it.

Myth 3: Free plans are demos without real scanning

Fact: Aikido Security, Semgrep, Snyk and Endor Labs publish free tiers, and each lists the scans included. Aikido's free Developer plan covers 2 users with SCA, SAST, AI SAST, secrets and 10 AI AutoFixes a month. Semgrep's free plan covers up to 10 contributors and 10 private repositories. Snyk's Free plan includes 100 Snyk Code tests a month and SCA, SAST, IaC and container scanning. Endor Labs' Developer tier runs locally without an account. What free plans tend to leave out is the agent layer: Snyk's coding agent security, for example, requires an Enterprise subscription.

Myth 4: No published price means an expensive tool

Fact: an unpublished price tells you nothing about the level, only that you cannot model it before a call. Legit Security and Apiiro publish no prices, and Endor Labs, Cycode and OX Security publish a unit or tier names without figures. Our pricing transparency criterion scores what is published, not whether a price is high or low. Our note on published prices sets out what the other four vendors publish.

Myth 5: npm v12 solves malicious packages

Fact: npm v12 closes one route. GitHub announced that npm v12 will not run dependency install scripts unless they are approved with npm approve-scripts, and will not resolve git or remote URL dependencies without explicit flags. It does not inspect code that runs when a package is imported, and it does not apply to other registries such as PyPI. That gap is why Aikido Security, Endor Labs, OX Security and Semgrep describe install-time package checks. See our note on npm v12 install scripts.

Source: GitHub Changelog: upcoming breaking changes for npm v12 · Reviewed Sep 2026

Myth 6: Secrets only leak through commits

Fact: with coding agents, a secret can leave the machine before any commit exists, inside a prompt or an MCP tool call. Cycode's AI Guardrails intercept secrets in prompts, file reads and MCP tool calls before they leave the IDE, and Legit VibeGuard blocks API keys, tokens and passwords from being shared with AI systems. Keys also sit outside repositories: Legit's secrets scanning covers Jira, Confluence, Slack and developers' personal GitHub accounts. Commit and push checks still matter; GitHub push protection blocks pushes that contain secrets.

What the six have in common

Each myth treats one layer as the whole answer: the agent, the scanner, the registry or the repository. The vendors' own pages describe a stack in which each layer catches something the others miss. Our scores are built the same way: coding agent guardrails carry 30% and AI-generated code coverage 20%, with the rest spread across secrets and supply chain, prioritization, developer fit, deployment and pricing.

Sources

  1. Legit Security: VibeGuard legitsecurity.com
  2. Legit Security: secret scanning legitsecurity.com
  3. Aikido Security: pricing aikido.dev
  4. Semgrep: pricing semgrep.dev
  5. Snyk: plans snyk.io
  6. Endor Labs: pricing endorlabs.com
  7. GitHub Changelog: upcoming breaking changes for npm v12 github.blog
  8. Cycode: AI Guardrails cycode.com
  9. GitHub Docs: about GitHub Advanced Security docs.github.com

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