Agent action pre-execution validator

★ 7.9 · vibe-coding

action-validator is a Claude Code skill that provides an advisory pre-action validation layer, checking every agent tool call against the agent's declared capabilities, R002 file access rules, and task contract constraints before execution. Rather than blocking operations, it follows the advisory-first model (R021) and emits structured scope warnings with suggested corrections. For high-repetition agents — such as mgr-gitnerd git commit workflows — it supports policy caching of validated decision paths, reducing redundant LLM calls. When a synthesized harness exists under .claude/outputs/harnesses/, code-verified validation becomes available; hard-enforce mode requires explicit opt-in. The skill integrates with pipeline-guards, adversarial-review, and optional PreToolUse hooks, making it essential for multi-agent pipelines where enforcing action-space boundaries across agents matters.