Use for any feature that involves creating or modifying lib/*.js modules, updating codex-quota.js (routing, barrel re-exports), adding tests to codex-quota.test.js, or modifying lib/display.js / lib/handlers.js / lib/constants.js.

Work Procedure

Step 1: Understand the Feature

Read the feature description, preconditions, expectedBehavior, and verificationSteps carefully. Read AGENTS.md for conventions and boundaries. Read any referenced library files in .factory/library/.

Step 2: Investigate Existing Patterns

Before writing any code, read the existing parallel modules to understand patterns:

For account modules: read lib/codex-accounts.js or lib/claude-accounts.js
For usage modules: read lib/codex-usage.js or lib/claude-usage.js
For token modules: read lib/codex-tokens.js or lib/claude-tokens.js
For handlers: read lib/handlers.js (look at handleCodex/handleClaude switch statements)
For display: read lib/display.js (look at buildAccountUsageLines/buildClaudeUsageLines)
For constants: read lib/constants.js for naming conventions
For tests: read codex-quota.test.js for test patterns, mock helpers, cleanup patterns

Match the existing patterns exactly. Do not invent new patterns.

Step 3: Write Tests First (RED)

Add test cases to codex-quota.test.js (or the appropriate test file) BEFORE writing implementation:

Import from ./codex-quota.js (barrel re-exports), NOT from lib/ directly
Use describe/test/expect structure
Add beforeEach/afterEach for environment cleanup
Use os.tmpdir() for temp files
Mock API responses using the documented format from AGENTS.md
Cover: happy path, error cases, edge cases from the feature's expectedBehavior

Run bun test to confirm the new tests FAIL (since implementation doesn't exist yet).

Step 4: Implement (GREEN)

Write the implementation in lib/*.js modules:

Follow existing module patterns exactly (imports, error handling, JSDoc, section dividers)
Use tabs for indentation, double quotes, semicolons
Use node: prefix for Node.js built-in imports
Add barrel re-exports to codex-quota.js for ALL new exports
If modifying handlers.js, add routing in the correct switch statement
If modifying constants.js, follow UPPER_SNAKE_CASE naming
If adding display functions, use existing drawBox, printBar, shortenPath helpers

Run bun test to confirm all tests PASS (both new and existing).

Step 5: Verify

Run bun test — ALL tests must pass (existing + new), zero failures
Run node codex-quota.js to verify the CLI still works for existing providers
If the feature adds CLI commands, run them manually and verify output
Run node scripts/preflight.js to verify package integrity
Check that no sensitive data (API keys, JWTs, encryption keys) appears in any output

Step 6: Commit

Commit with a descriptive message following the project's commit style (see git log --oneline).

Example Handoff

{
  "salientSummary": "Implemented lib/factory-usage.js with fetchFactoryUsage() supporting both JWT and API key auth, billing period calculation with configurable start day, and monthly token aggregation. Added 18 tests covering happy path, billing edge cases, auth fallback, and error handling. All 224 tests pass (206 existing + 18 new).",
  "whatWasImplemented": "Created lib/factory-usage.js with fetchFactoryUsage(account, billingDay), computeBillingPeriod(billingDay, now), and sumDailyTokens(data) functions. Added FACTORY_USAGE_URL, FACTORY_TIMEOUT_MS constants. Added barrel re-exports. Integrated into handleQuota for scope 'factory' and 'all'.",
  "whatWasLeftUndone": "",
  "verification": {
    "commandsRun": [
      { "command": "bun test", "exitCode": 0, "observation": "224 tests passed, 0 failed" },
      { "command": "node codex-quota.js factory quota --json", "exitCode": 0, "observation": "Outputs valid JSON with Factory usage data structure" },
      { "command": "node codex-quota.js", "exitCode": 0, "observation": "Default view shows Codex, Claude, and Factory sections" },
      { "command": "node scripts/preflight.js", "exitCode": 0, "observation": "All preflight checks pass, lib/ included in files array" }
    ],
    "interactiveChecks": [
      { "action": "Ran cq factory quota with mock account", "observed": "Box rendered with usage bar, billing period, model breakdown" },
      { "action": "Ran cq factory quota --billing-day 15", "observed": "Billing period adjusted to 15th-to-15th window" },
      { "action": "Ran cq codex quota after changes", "observed": "Codex output unchanged from before" }
    ]
  },
  "tests": {
    "added": [
      {
        "file": "codex-quota.test.js",
        "cases": [
          { "name": "fetchFactoryUsage returns parsed usage data", "verifies": "Happy path API call" },
          { "name": "fetchFactoryUsage falls back to API key", "verifies": "JWT unavailable, uses fk- key" },
          { "name": "computeBillingPeriod defaults to day 1", "verifies": "Default billing period" },
          { "name": "computeBillingPeriod handles day 31 in February", "verifies": "Clamp to last day" }
        ]
      }
    ]
  },
  "discoveredIssues": []
}

When to Return to Orchestrator

Feature depends on a module that doesn't exist yet (e.g., factory-accounts.js not created)
The Factory Analytics API format differs from what's documented in AGENTS.md
Existing test failures unrelated to your changes (beyond the known 5 port-conflict tests)
Circular dependency detected between Factory modules and existing modules
Cannot match existing patterns because the existing code structure doesn't support the needed change

name	cli-feature-worker
description	Implements Node.js CLI features with TDD for the codex-quota project

CLI Feature Worker

NOTE: Startup and cleanup are handled by worker-base. This skill defines the WORK PROCEDURE.

When to Use This Skill