A systematic workflow for feature development and bug fixing using autonomous agents with built-in validation.

Install

mkdir -p .claude/skills/apex && curl -L -o skill.zip "https://agentskills.codes/api/skills/download/11073" && unzip -o skill.zip -d .claude/skills/apex && rm skill.zip

Installs to .claude/skills/apex

Activation

This is the description your AI agent reads to decide when to run this skill — the better it matches your request, the more reliably it fires.

Systematic implementation using APEX methodology (Analyze-Plan-Execute-eXamine) with parallel agents, self-validation, and optional adversarial review. Use when implementing features, fixing bugs, or making code changes that benefit from structured workflow.
258 chars✓ has a “when” triggerlonger than Claude Code's old 250-char listing cap (fine on current versions)
Advanced

Key capabilities

  • Analyze project context
  • Plan implementation steps
  • Execute code changes
  • Perform adversarial review
  • Verify feature implementation

How it works

It follows the APEX methodology (Analyze-Plan-Execute-eXamine) using parallel agents to implement, validate, and review code changes.

Inputs & outputs

You give it
Task description
You get back
Implemented feature or fix

When to use apex

  • Implementing new features
  • Fixing complex bugs
  • Adversarial code review
  • Autonomous feature verification

About this skill

<objective> Execute systematic implementation workflows using the APEX methodology with progressive step loading. </objective>

<quick_start>

/apex add authentication middleware           # Basic
/apex -a -s implement user registration       # Autonomous + save
/apex -a -x -s fix login bug                  # With adversarial review
/apex -a -v implement user dashboard          # With feature verification
/apex -a -m implement full auth system        # Agent Teams (parallel)
/apex -a -x -s -t -v add auth middleware      # Full workflow with tests + verify
/apex -a -pr add auth middleware              # With PR creation
/apex -r 01-auth-middleware                   # Resume previous task
/apex -e add auth middleware                  # Economy mode (save tokens)
/apex -i add auth middleware                  # Interactive flag config

</quick_start>

<flags> **Enable (lowercase ON) / Disable (UPPERCASE OFF):**
ONOFFLongDescription
-a-A--autoSkip confirmations, auto-approve
-x-X--examineAdversarial code review
-s-S--saveSave outputs to .claude/output/apex/
-t-T--testInclude test creation + runner
-v-V--verifyLaunch app and verify feature works
-e-E--economyNo subagents, save tokens
-b-B--branchVerify not on main, create branch
-pr-PR--pull-requestCreate PR at end (enables -b)
-i--interactiveConfigure flags via menu
-k-K--tasksTask breakdown with dependencies
-m-M--teamsAgent Teams parallel execution (enables -k)
-r--resumeResume from previous task ID

Parsing: Defaults from steps/step-00-init.md, flags override, remainder = {task_description}, ID = NN-kebab-case. </flags>

<workflow> 1. **Init** → Parse flags, setup state 2. **Analyze** → Context gathering (1-10 parallel agents) 3. **Plan** → File-by-file strategy + TaskList creation 4. **Tasks** → Task breakdown (if -k or -m) 5. **Execute** → Implementation (standard or Agent Teams if -m) 6. **Validate** → Typecheck, lint, tests 7. **Tests** → Create + run tests (if -t) 8. **Examine** → Adversarial review (if -x) - Security + Logic + Clean Code + Thermo-Nuclear maintainability audit in parallel 9. **Resolve** → Fix findings (if examine found issues) 10. **Verify** → Launch app, test feature (if -v) 11. **Finish** → Create PR (if -pr) </workflow>

<step_files>

StepFilePurpose
00steps/step-00-init.mdParse flags, initialize state
00bsteps/step-00b-save.mdSetup save output structure (if -s)
00bsteps/step-00b-branch.mdGit branch setup (if -b)
00bsteps/step-00b-economy.mdEconomy mode overrides (if -e)
00bsteps/step-00b-interactive.mdInteractive flag config (if -i)
01steps/step-01-analyze.mdSmart context gathering
02steps/step-02-plan.mdFile-by-file plan + TaskList
02bsteps/step-02b-tasks.mdTask breakdown (if -k/-m)
03steps/step-03-execute.mdTodo-driven implementation
03tsteps/step-03-execute-teams.mdAgent Team execution (if -m)
04steps/step-04-validate.mdSelf-check and validation
05steps/step-05-examine.mdAdversarial code review
06steps/step-06-resolve.mdFinding resolution
07steps/step-07-tests.mdTest analysis and creation
08steps/step-08-run-tests.mdTest runner loop
09steps/step-09-finish.mdCreate pull request
10steps/step-10-verify.mdLaunch & verify feature

</step_files>

<state_variables>

VariableTypeSet by
{task_description}stringstep-00
{feature_name}stringstep-00
{task_id}stringstep-00 / step-00b-save
{acceptance_criteria}liststep-01
{auto_mode}booleanstep-00
{examine_mode}booleanstep-00
{save_mode}booleanstep-00
{test_mode}booleanstep-00
{verify_mode}booleanstep-00
{economy_mode}booleanstep-00
{branch_mode}booleanstep-00
{pr_mode}booleanstep-00
{tasks_mode}booleanstep-00
{teams_mode}booleanstep-00
{output_dir}stringstep-00b-save
{branch_name}stringstep-00b-branch

</state_variables>

<execution_rules>

  • Load one step at a time (progressive loading)
  • ULTRA THINK before major decisions
  • Persist state variables across all steps
  • Follow next_step directive at end of each step
  • Save outputs if {save_mode} = true (each step appends to its file)
  • Use parallel agents for independent exploration (step-01)
  • Use online research intentionally: default harness tools for local code first, ../find-docs/SKILL.md for current technical docs, and ../exa-search/SKILL.md for broader web research or cited sources </execution_rules>

<entry_point> FIRST ACTION: Load steps/step-00-init.md </entry_point>

When not to use it

  • Environments without git

Prerequisites

Git repository

Limitations

  • Requires structured task description
  • Progressive loading can be slow for simple tasks

How it compares

It uses a multi-agent, progressive step-loading workflow with adversarial review instead of a single-pass implementation.

Compared to similar skills

apex side by side with the closest alternatives in the catalog.

SkillInstallsUpdatedSafetyDifficulty
apex (this skill)01moReviewAdvanced
develop-ai-functions-example56moReviewIntermediate
adk-engineer327dReviewAdvanced
code-assist15moNo flagsAdvanced

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