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The instruction tells Copilot to verify PyPI/npm package and symbol names against the attester.dev existence oracle (free keyless tier, 25 calls/day per client IP) before installing or importing, catching hallucinated dependency names (5.2-21.7% of LLM suggestions per USENIX Security 2025). The preToolUse hook enforces the same check on code the agent writes: stdlib-only script, blocks only on a confident oracle negative, fails open on quota or network trouble, caches answers on disk. README tables regenerated with npm start.