What problem does it solve? Setting up the Essential marketplace's specialist agents across Claude Code, Codex, and Grok Build requires stitching split agent templates into harness-specific formats and, for Grok, attaching startup bootstrap instructions to user configuration. Doing this manually risks stale definitions, conflicting files, and broken bootstrap paths. ## Core Features & Use Cases - Harness-aware installation: Discovers agent templates from source checkouts or enabled same-marketplace plugins and stitches them into Claude Markdown, Codex TOML, or Grok Markdown definitions. - Conflict-safe refresh: Records owned paths and hashes under .essential/, stops before overwriting unowned or modified files, and rolls back failed operations. - Grok bootstrap attachment: Adds a managed, marked instruction block in Grok's AGENTS.md pointing at the absolute GROK.md bootstrap path, preserving other content. - Use Case: After enabling the Essential plugin in Grok Build, run this skill to install all agent definitions into ~/.grok/agents and wire up the startup guidance so a fresh session loads the agent team. ## Quick Start Ask the agent to install the Essential agent team for the current harness, for example: "Run the install skill to set up the Essential agents for Grok Build."