Credo Custom Checks

credo-custom-checks

Use when creating custom Credo checks for project-specific code quality rules and standards in Elixir.

TheBushidoCollective/han·0installs199stars

SKILL.md

Full skill instructions

Credo Custom Checks

Creating custom Credo checks for project-specific rules.

Creating a Custom Check

defmodule MyApp.Credo.Check.NoHardcodedSecrets do
  use Credo.Check,
    category: :warning,
    base_priority: :high,
    explanations: [
      check: """
      Detects hardcoded secrets in code.
      """
    ]

  @impl true
  def run(%SourceFile{} = source_file, params) do
    issue_meta = IssueMeta.for(source_file, params)

    Credo.Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
  end

  defp traverse(
         {:@, _, [{:secret_key, _, [value]}]} = ast,
         issues,
         issue_meta
       )
       when is_binary(value) do
    new_issue = issue_for(issue_meta, value)
    {ast, [new_issue | issues]}
  end

  defp traverse(ast, issues, _issue_meta) do
    {ast, issues}
  end

  defp issue_for(issue_meta, value) do
    format_issue(
      issue_meta,
      message: "Hardcoded secret found: #{String.slice(value, 0..5)}...",
      trigger: value
    )
  end
end

Using Custom Checks

# .credo.exs
%{
  configs: [
    %{
      name: "default",
      requires: ["./lib/my_app/credo/check/*.ex"],
      checks: %{
        enabled: [
          {MyApp.Credo.Check.NoHardcodedSecrets, []}
        ]
      }
    }
  ]
}

Install skill

Copy and run in your terminal

npx -y skills add https://github.com/TheBushidoCollective/han --skill credo-custom-checks

View on GitHub

plugins/validation/credo/skills/credo-custom-checks/SKILL.md

android-jetpack-compose
Use when building Android UIs with Jetpack Compose, managing state with remember/mutableStateOf, or implementing declarative UI patterns.
2.2K installs
react-native-native-modules
Use when building or integrating native modules in React Native. Covers creating native modules, Turbo Modules, bridging native code, and accessing platform-specific APIs.
1 installs
gitlab-ci-job-configuration
Use when defining GitLab CI jobs, configuring scripts, setting up environments, or managing job dependencies. Covers job structure and execution options.
0 installs
bun-package-manager
Use when managing dependencies with Bun's package manager. Covers installing packages, workspaces, lockfiles, and migrating from npm/yarn/pnpm to Bun.
0 installs

More skills from TheBushidoCollective

TheBushidoCollective/han

typescript-utility-types

Use when typeScript utility types, mapped types, and advanced type manipulation. Use when creating flexible, type-safe TypeScript code.

199 0

View

TheBushidoCollective/han

shell-portability

Use when writing shell scripts that need to run across different systems, shells, or environments. Covers POSIX compatibility and platform differences.

199 0

View

TheBushidoCollective/han

tailwind-performance

Use when optimizing Tailwind CSS for production, reducing bundle size, and improving performance. Covers PurgeCSS, JIT mode, and build optimization.

199 0

View

TheBushidoCollective/han

figma-generate-component

Generate production-ready code from a Figma component or frame using the Figma MCP server

199 0

View

TheBushidoCollective/han

dialyzer-integration

Use when integrating Dialyzer into development workflows and CI/CD pipelines for Erlang/Elixir projects.

199 0

View

TheBushidoCollective/han

rubocop-configuration

Use when ruboCop configuration including YAML config, departments, inheritance, and customization.

199 0

View

TheBushidoCollective/han

elixir-otp-patterns

Use when Elixir OTP patterns including GenServer, Supervisor, Agent, and Task. Use when building concurrent, fault-tolerant Elixir applications.

199 0

View

TheBushidoCollective/han

ameba-custom-rules

Use when creating custom Ameba rules for Crystal code analysis including rule development, AST traversal, issue reporting, and rule testing.

199 0

View

TheBushidoCollective/han

Use when swift's optional handling patterns including optional binding, chaining, nil coalescing, and modern approaches to safely working with optional values while avoiding common pitfalls and force unwrapping.

199 0

View

TheBushidoCollective/han

code-annotation-patterns

Use when annotating code with structured metadata, tags, and markers for AI-assisted development workflows. Covers annotation formats, semantic tags, and integration with development tools.

199 0

View

TheBushidoCollective/han

Scala Collections

Use when scala collections including immutable/mutable variants, List, Vector, Set, Map operations, collection transformations, lazy evaluation with views, parallel collections, and custom collection builders for efficient data processing.

199 0

View

TheBushidoCollective/han