Skills to find unknown bugs before release!

We help your agents test edge cases in your software where rare production bugs hide.

Most AI-written tests optimize for coverage. They assert implementation details, mock away the real risk, and pass even when the product breaks. @workersio/skills gives coding agents a testing workflow that asks a stricter question: will this test catch a real regression that users, operators, reviewers, or maintainers care about?

@workersio/skills is one skill with five command modes:

$wio scan      # Find high-value tests to add next.
$wio test      # Run candidate discovery, strategy, implementation, and review.
$wio workload  # Generate realistic, replayable workloads with new bug-finding value.
$wio review    # Judge whether a test should be kept, redone, or removed.
$wio doctor    # Audit suite health, weak assertions, flakes, mocks, and CI blind spots.

Works With

           

@workersio/skills is packaged for Codex and Claude Code today. The core skill content is plain Markdown, so the testing workflow can also be adapted by other coding agents that support project skills, instructions, or reusable prompts.

Install

Direct skill install:

npx skills add workersio/skills

Codex plugin marketplace:

codex plugin marketplace add workersio/skills

Claude Code plugin marketplace:

claude plugin marketplace add workersio/skills
claude plugin install wio@workersio-skills

For local Codex plugin testing from this checkout:

codex plugin marketplace add .

What It Provides

Area	What the agent gets
Test discovery	Maps product behavior, recent changes, existing tests, CI, and risk areas before choosing what to test.
Strategy selection	Chooses the right level: unit, component, integration, contract, E2E, workload, fuzz, property, mutation, resilience, or monitoring.
Test writing	Adds focused tests using the repository's own framework, naming, fixtures, helpers, and runner conventions.
Workload generation	Creates realistic, adversarial, seeded, replayable sessions or traffic that add coverage beyond wrappers and parameter sweeps.
Test review	Applies a strict value gate: KEEP, REDO, or REMOVE. Coverage alone is not enough.
Suite health	Finds weak assertions, over-mocking, broad snapshots, flakes, skipped tests, slow feedback loops, and CI blind spots.

Command Guide

Command	Use it when	Example
$wio scan [target]	You do not yet know what to test.	$wio scan checkout
$wio test [target]	You want the full write-and-review loop.	$wio test billing eligibility regression
$wio workload [target]	The risk lives in realistic user, API, CLI, job, or load behavior.	$wio workload onboarding session
$wio review [target]	A test exists and you need to decide whether it has real value.	$wio review tests/billing_eligibility_test.py
$wio doctor [target]	The suite is hard to trust or maintain.	$wio doctor API test suite

Quality Bar

An approved test should answer:

• What user, operator, customer, or API consumer failure does this prevent?
• What production, release, support, debugging, or review risk does it reduce?
• Would it fail for the regression that matters?
• Which assertion or invariant catches the plausible bug?
• Does the setup preserve the important dependency, state, permission, timing, or data risk?
• Does this belong in local development, PR CI, nightly, release, or production monitoring?
• If this is a workload, what existing workload gap does it fill?

If those answers are weak, the test should be redesigned or removed.

Subagents

@workersio/skills includes three optional focused subagents:

Subagent	Role
wio-candidate-scout	Read-only discovery of high-value test candidates before implementation.
wio-strategy-critic	Read-only challenge of the selected strategy before editing tests.
wio-test-reviewer	Read-only post-write review that returns KEEP, REDO, or REMOVE.

The main agent still writes the test and owns the final decision. Subagents inspect, challenge, and review; they do not duplicate the reference library or replace the main workflow.

Repository Layout

Path	Purpose
plugins/wio/skills/wio/SKILL.md	Source of truth for the skill workflow.
plugins/wio/skills/wio/references/	Detailed testing guidance loaded only when relevant.
plugins/wio/agents/	Claude Code plugin subagents.
.codex/agents/	Codex custom-agent TOML files for project or user installs.
plugins/wio/hooks/hooks.json	Shared plugin hook config.
.agents/plugins/marketplace.json	Codex marketplace entry.
.claude-plugin/marketplace.json	Claude Code marketplace entry.
public/	README assets, demo GIF, and agent icons.

Codex Agents And Hooks

Codex plugin installs include the skill and plugin hook config. Codex custom agents are a separate native surface loaded from .codex/agents/ in a project or ~/.codex/agents/ for the user.

Enable the Codex agents globally:

mkdir -p ~/.codex/agents
cp .codex/agents/wio-*.toml ~/.codex/agents/

Enable the Codex agents for the current project:

mkdir -p .codex/agents
cp /path/to/wio-skills/.codex/agents/wio-*.toml .codex/agents/

Enable the Codex hook config for the current project:

mkdir -p .codex
cp /path/to/wio-skills/.codex/hooks.json .codex/hooks.json

Claude Code Agents And Hooks

Claude plugin installs include the skill, plugin hooks, and Markdown subagents from plugins/wio/agents/. Project-local Claude Code agents can also be copied into .claude/agents/ when a repository is not using the plugin.

References

Detailed testing guidance lives only in plugins/wio/skills/wio/references/. Reference topics cover behavior mapping, risk-based testing, test levels, workload modeling, oracles, fixtures, mocks, suite health, static analysis, security testing, fuzzing, property-based testing, mutation testing, performance testing, resilience testing, and regression selection.

Contributing

Keep the public surface area small: one skill, wio, with command modes scan, test, workload, review, and doctor.

Detailed testing guidance belongs in plugins/wio/skills/wio/references/, not duplicated inside cloud folders, subagents, hooks, or extra skill trees. When adding a reference topic, add both overview.md and tools.md, then link it from plugins/wio/skills/wio/references/index.md.

See CONTRIBUTING.md for contribution workflow and release expectations.

License

MIT. See LICENSE.