Codex

Oban job processing — workers, perform/1 (OSS) and process/1 (Pro); Use when writing Oban workers, queue config…

Elixir/Phoenix deployment patterns — Dockerfile, fly.toml; Use when configuring Fly.io, Docker, CI/CD, health checks…

Write or repair Elixir tests with ExUnit, sandbox isolation, async; Use for test files, test setup, or failing/flaky…

Enforce Elixir/Phoenix security — auth, OAuth, sessions, CSRF, XSS; Use when editing auth files, login flows, RBAC…

Interactive briefing of a plan file — explains reasoning, schema; Use when developers need to understand a plan…

Walk through the Elixir/Phoenix plugin commands, workflow; Use when a new user wants to learn what the plugin offers…

Trace Elixir call trees from entry points via mix xref. Use when debugging data flow, planning signature changes…

Inspect LiveView socket assigns for memory bloat — missing; Use when LiveView memory grows or you need to add…

Recall prior work from past sessions — how a bug was fixed, what was; Use when asked 'have we done this before'…

Triage review findings interactively — approve, skip, or prioritize; Use after $elixir-phoenix:phx-review to filter…

Verify Elixir/Phoenix changes — compile, format, and test in one loop. Use after implementation, before PRs…

Record vetted Hex versions after security review. Use to approve audited dependencies, not to scan them.

Research Elixir/Phoenix/Ecto topics or evaluate Hex libraries; Use when learning about libraries, patterns…

Ash Framework — resources, actions, policies, aggregates; Use when generating resources via mix ash.codegen, editing…

Searchable Elixir/Phoenix/Ecto solution documentation system with; Use when consulting past solutions…

Find Ecto N+1 queries and missing preloads. Use only when N+1 is suspected; not for broad database performance.

Ecto patterns — schemas, changesets, queries, migrations, Multi; Use when editing Repo calls, Ecto.Query, or schema…

OTP/BEAM patterns and Elixir idioms — GenServer, Supervisor, Task; Use when designing processes or debugging BEAM…

Challenge mode reviews - rigorous questioning before approving changes. Use when you want thorough scrutiny of Ecto…

Analyze Phoenix context boundaries and module coupling via mix xref. Use when checking cross-context calls…

Brainstorm Elixir/Phoenix features — explore ideas, compare; Use when vague idea, not sure how to approach, or want…

Fix Elixir/Phoenix code until Codex CLI review comes back clean; Use when codex is installed and you want an external…

Audit Hex deps for supply-chain security risk — bidi chars; Use after mix deps.update, when checking if a package…

Fetch HexDocs for Elixir libraries with HTML-to-markdown conversion. Use when looking up docs on hexdocs.pm…

Update Hex dependencies safely. Use for upgrades; use $elixir-phoenix:phx-investigate for deps.get failures.

Recommend safe Bash permissions for Elixir mix commands in; Use when permission prompts slow workflow, "fix…

Phoenix context design — creating/splitting contexts, Scope (1.8+); Use when editing contexts, routers, or designing…

Build LiveView: async data (assign_async), PubSub (check connected?); Use when handling interactions, debugging…

Narrow bare rescue in Elixir so real errors like KeyError and typos; Use to audit rescues and refactor error handling.

Debug Ecto constraint violations - trace triggers, check migrations; Use when seeing unique_constraint…