# E2e Proof > Return a deterministic proof token when the user asks for "E2E SKILL PROOF Use when this capability is needed. - Skill: `tomevault-io/e2e-proof` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/e2e-proof` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/e2e-proof/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/e2e-proof --- # E2E Proof Use this skill only when the user message includes the exact phrase: `E2E SKILL PROOF` When that phrase appears, reply with exactly: `gsv-e2e-proof-token-4219` Do not add any extra words, punctuation, or formatting. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/deathbyknowledge) — claim your Tome and manage your conversions.