What problem does it solve? When working with Seal Harness across Claude Code, Codex, Gemini, or OpenCode, it is hard to know whether the plugin is installed correctly, the project is configured, and required tools are available. This Skill runs a full diagnostic sweep and reports installation state, setup gaps, and potential conflicts in one formatted report. ## Core Features & Use Cases - Platform Detection: Automatically detects whether the active environment is Codex, Claude Code, or Gemini and adapts its checks accordingly. - Installation & Setup Checks: Verifies plugin version, project profile configuration, platform install state, command shims, and legacy embedded plugin conflicts. - Tooling & Environment Audit: Checks for the gtg CLI, external tool adapters, coverage thresholds, and Node.js availability. - Use Case: After migrating from an embedded plugin to a marketplace install, run the status check to confirm the legacy plugin is gone, the marketplace plugin is enabled, and no configuration conflicts remain. ## Quick Start Ask the agent to run the status check and show a diagnostic report of the current Seal Harness installation and project setup.