Hallucinated technical decisions destroy projects:

Suggesting React when project uses Vue (wrong framework)
Creating duplicate User entity when one already exists (duplicate schema)
Recommending fake npm packages that don't exist (non-existent dependencies)
Proposing PostgreSQL functions not available in project's version (incompatible APIs)
Suggesting AWS services when project uses Google Cloud (wrong cloud provider)
Inventing API endpoints that don't exist in external service (fake APIs)

This skill acts as a reality checker that:

Loads project's tech stack from docs/project/tech-stack.md (single source of truth)
Validates all technical suggestions against documented choices
Verifies entities, APIs, packages exist in codebase or documentation
Requires evidence/citations for all technical claims
Blocks suggestions that violate documented architecture
Corrects hallucinations with actual project technology

hallucination-detector