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This skill should be used when teams need to adopt Supertester to build deterministic Elixir OTP tests with isolation, synchronization, and supervision coverage.

Use when Codex is working in an environment with Atlas Once available through MCP or the atlas CLI, especially for status discovery, ranked context, project registry inspection, memory/note capture, profile setup, or Codex CLI MCP onboarding. Prefer schema-backed Atlas MCP tools and installer-managed configuration over shell recipes or direct config-file edits.

Evidence-first debugging for Elixir, Erlang, OTP, ExUnit, GenServer, supervision, process state, message flow, races, hangs, memory, performance, macros, and failing BEAM tests. Use when diagnosing unexpected behavior or test failures in an Elixir/Erlang repository.