Category comparison
This page compares three categories of developer security tooling as they apply to AI coding agents. Runtime guardrails (like HOL Guard) intercept actions before execution. Static code analyzers review source patterns. Dependency scanners match package versions against known CVE databases. They protect different things at different times and are complementary, not interchangeable.
Last reviewed: 2026-07-22. This comparison describes tool categories, not specific vendors. Capability descriptions are general to each category.
| Category | Runtime Guardrails | Code Scanners | Dependency Scanners |
|---|---|---|---|
| Intervention point | Before execution, at runtime | After authoring, pre-commit or CI | After publish, periodic or on install |
| Protected actions | Shell commands, file reads, writes, MCP calls | Source code patterns and data flows | Package versions in lockfiles |
| Secret access | Blocks reads of .env, .npmrc, SSH keys before access | Flags hardcoded secrets in source | No direct secret-access protection |
| MCP and tool calls | Intercepts and approves MCP registrations and tool calls | No runtime tool-call interception | No runtime tool-call interception |
| Dependency CVEs | Can block installs of known-vulnerable packages | May flag vulnerable imports if configured | Primary capability: CVE matching |
| Source-code analysis | No static analysis of source patterns | Primary capability: taint, injection, code smell | No source-code analysis |
| Offline behavior | Fully functional without network | Works offline after rule download | Requires CVE database access |
| Audit evidence | Approval receipts with command, hash, and timestamp | Findings report per scan | Vulnerability list per scan |
| Limitations | Does not analyze source code statically | Cannot intercept runtime actions | Cannot intercept runtime actions or read source |
| Best-fit workflow | Teams using AI coding agents who need real-time control | Code review automation and secure coding enforcement | Supply-chain risk management and patch prioritization |
Runtime guardrails are for teams whose primary risk is AI agents taking actions (reading secrets, running commands, modifying configs) that a human has not approved. They are the only category that can prevent a harmful action before it happens.
Code scanners are for teams who want to catch insecure code patterns before merge. They complement runtime guardrails by catching issues in the source itself.
Dependency scanners are for teams who need to know whether their installed packages contain known vulnerabilities. They are essential for supply-chain risk management but cannot protect against runtime actions.
Most teams using AI coding agents benefit from all three layers. Runtime guardrails are the newest category and the one most directly relevant to the risks AI agents introduce.
No. They protect different things at different times and are complementary, not interchangeable. Runtime guardrails intercept supported actions before execution. Static code analyzers review source patterns. Dependency scanners match package versions against known CVE databases.
No. A scan is not a safety guarantee and cannot intercept runtime actions. The current public catalog scanner is registry-broker-fallback static scoring, not a live exploit test. About 205 catalog plugins are not Registry Broker agent counts.
No. HOL Guard is local-first runtime control on the developer machine for shell, secrets/file reads, MCP server change, and plugin/skill install. It does not replace SCA, SAST, mcp-scan, or a complete supply-chain security program. Runtime benchmark fixtures are modeled, not live attack measurements.
No. Those scanners do not intercept runtime tool calls. HOL Guard can require approval at supported local action boundaries. It is not a complete prompt-injection preventer and does not stop the model from following instructions already in context.