{"slug":"verify-7","title":"verify","summary":"Verify Elixir/Phoenix changes — compile, format, and test in one loop. Use after implementation, before PRs, or after fixing bugs.","platform":"Claude","tags":[],"authorName":"LLM Mart","authorSlug":"llm-mart","score":0,"source":"github","price":null,"verified":false,"createdAt":"2026-10-04T15:14:17.502282Z","repo":{"url":"https://github.com/oliver-kriska/claude-elixir-phoenix","stars":560,"forks":44,"license":"MIT","updatedAt":"2026-10-02T04:11:38Z"},"bodyHtml":"
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name: verify\ndescription: Verify Elixir/Phoenix changes — compile, format, and test in one loop. Use after implementation, before PRs, or after fixing bugs.\neffort: low

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Verification Loop

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Project-aware verification for Elixir/Phoenix. Reads mix.exs and .check.exs to discover tools, test commands, and custom aliases before running anything.

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Iron Laws

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  1. Discover before running — Read mix.exs first; never run mix credo if credo isn't a dependency
    2. \n
  2. Prefer ex_check — If :ex_check + .check.exs exists, mix check replaces individual steps
    3. \n
  3. Prefer project aliases — If mix ci or composite alias exists, use it over individual steps
    4. \n
  4. Run in order — Later steps assume earlier ones pass
    5. \n
  5. Ask before E2E tests — Unit tests run automatically; E2E/integration tests need user confirmation
    6. \n
  6. NEVER report success without showing actual command output — \"should work\" is not verification
    7. \n
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Step 0: Project Discovery (ALWAYS FIRST)

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Read mix.exs — extract deps/0, aliases/0, and cli/0 (for preferred_envs). Also check for .check.exs. See ${CLAUDE_SKILL_DIR}/references/project-discovery.md for full patterns.

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Discover tools (deps): :credo, :dialyxir, :sobelow, :ex_check, :excoveralls, :boundary

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Discover test commands (aliases + deps):

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Discover composite runner: If .check.exs exists, read it — mix check may handle compile, format, credo, test, dialyzer, sobelow, and more.

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Report discovery:

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Project tools: compile ✓ | format ✓ | credo ✓ | dialyzer ✓ | sobelow ✓ | ex_check ✓\nTest commands: mix test (unit) | mix playwright.test (E2E, MIX_ENV=int_test)\nComposite runner: mix check (.check.exs covers: compiler, formatter, credo, dialyzer, sobelow, tests)\nStrategy: Running `mix check` then asking about E2E\n
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Verification Sequence

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Before using any discovered alias or composite command, confirm it runs:

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  1. Check the dependency is in mix.lock (not just mix.exs) — deps may not be fetched
    2. \n
  2. Run the command — if it fails with \"command not found\" or dependency error, fall back to individual steps
    3. \n
  3. Log the fallback: \"mix check failed (ex_check not installed?), falling back to individual steps\"
    4. \n
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If ex_check installed + .check.exs exists: Try mix check. If it fails, fall back to individual steps.

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If composite alias found (e.g., mix ci, mix precommit): Try it. If it fails, fall back to individual steps.

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Otherwise (or after fallback): Run individual steps, skipping unavailable tools.

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Step 1: Compile

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mix compile --warnings-as-errors — always

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Elixir 1.20+ (OTP 27+): the compiler's built-in type checker emits type\nviolations / verified bugs as warnings, so --warnings-as-errors now fails\nthe build on them — no Dialyzer needed. If a previously-green build fails\nafter a 1.20 bump, suspect a newly-detected type violation, not a regression.\nRead the message literally (accepted vs supplied type); it is almost always a\nreal bug. See elixir-idioms/references/elixir-120-type-system.md.

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Step 2: Format

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mix format --check-formatted — always (auto-fix with mix format if fails)

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Step 3: Credo

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mix credo --strict — if :credo in deps, else skip

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Step 4: Test

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mix test --trace — use project test alias if available

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Step 5: Dialyzer

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mix dialyzer — if :dialyxir in deps, pre-PR only

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Step 6: Sobelow

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mix sobelow --config — if :sobelow in deps

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Skip unavailable tools with: \"Credo: ⏭ Not installed\"

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Step 7: Additional Test Offer

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After core verification passes, check if project has additional test commands (E2E, integration, coverage). Ask the user:

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Core verification passed. Additional test commands available:\n1. mix playwright.test (E2E, MIX_ENV=int_test) — ~5min\n2. mix test.with_coverage (unit + coverage report)\nRun any of these? [1/2/both/skip]\n
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Respect preferred_envs / cli/0 for correct MIX_ENV on each command.

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Quick Reference

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StepCommandCondition
DiscoveryRead mix.exs + .check.exsAlways first
Compositemix checkIf :ex_check installed
Compilemix compile --warnings-as-errorsAlways
Formatmix format --check-formattedAlways
Credomix credo --strict:credo in deps
Testmix test --traceAlways (use alias if exists)
Dialyzermix dialyzer:dialyxir in deps, pre-PR
Sobelowmix sobelow --config:sobelow in deps
E2E/ExtraAsk userIf additional test commands found
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Usage

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  1. Run /phx:verify — discovery happens automatically
    2. \n
  2. Core checks run in order, adapted to project
    3. \n
  3. After pass, offered additional test commands (E2E, coverage)
    4. \n
  4. Commit only after all chosen checks pass
    5. \n
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