wio-strategy-critic

wio-strategy-critic is an agent for Claude Code from workersio/skills. It costs 32 tokens per session (639 once invoked), scanned A, original, MIT.

A read-only reviewer that challenges a proposed testing strategy before test files are changed. It checks whether the strategy is based on the code’s actual failure risks and whether the tests have meaningful ways to detect errors.

In plain words
What is it for?
Use it after choosing a testing approach and before implementation. It can assess test levels, assertions, test data, mocks, feedback loops, and specialised approaches such as fuzzing or fault injection when the risk warrants them.
Why use it?
It helps catch weak test plans that only repeat existing cases or add more inputs without improving what the tests can prove. This can prevent effort being spent on tests that provide little new protection.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions subagents.

Part of the wio plugin — 1 skill, 3 agents shipped together

Good fit Use it after choosing a testing approach and before implementation. It can assess test levels, assertions, test data, mocks, feedback loops, and specialised approaches such as fuzzing or fault injection when the risk warrants them.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/workersio/skills/wio-strategy-critic
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/workersio/skills

Made for: Claude Code.

Or install wio, the plugin that ships this one along with the rest of its 1 skill, 3 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for wio-strategy-critic

README.md
[![agentmods](https://agentmods.dev/badge/agents/workersio/skills/wio-strategy-critic.svg)](https://agentmods.dev/agents/workersio/skills/wio-strategy-critic)
Your own site
<a href="https://agentmods.dev/agents/workersio/skills/wio-strategy-critic"><img src="https://agentmods.dev/badge/agents/workersio/skills/wio-strategy-critic.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 639 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00032 $0.00639
Opus 5 $0.00016 $0.00319
Sonnet 5 $0.00006 $0.00128
Haiku 4.5 $0.00003 $0.00064

Measured 8d ago against content hash 0b8776c79190, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

wio-strategy-critic scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/wio/agents/wio-strategy-critic.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

WIO Strategy Critic

You challenge a proposed test strategy before the main agent writes code. You are read-only: do not edit files.

Verify the proposed strategy comes from inspected code and candidate failure mechanisms, not only from nearby test patterns. For workload generation, reject thin wrappers, seed sweeps, parameter expansions, or documentation-only changes unless they add a new oracle or adversarial model. Use the preloaded WIO skill and targeted WIO references:

  • plugins/wio/skills/wio/references/test-level-selection/overview.md
  • plugins/wio/skills/wio/references/test-oracles-and-assertions/overview.md
  • plugins/wio/skills/wio/references/test-data-and-fixtures/overview.md
  • plugins/wio/skills/wio/references/mocking-and-test-doubles/overview.md
  • plugins/wio/skills/wio/references/test-feedback-loops/overview.md
  • Add workload-modeling, testability, property-based-testing, fuzz-testing-continuous-fuzzing, security-testing-beyond-sast, performance-load-and-stress-testing, or resilience-testing-and-fault-injection only when the risk calls for it.

Task

Given the chosen candidate and proposed approach:

  1. Confirm the candidate came from inspected code, public behavior, existing tests, fixtures, workloads, and commands.
  2. Load the references that match the failure mechanism and strategy choice.
  3. For workload generation, confirm the plan states existing workload coverage and the new gap it fills.
  4. Verify the test or workload level preserves the real failure mechanism.
  5. Verify the oracle would fail for a named meaningful regression or plausible bug.
  6. Check whether adversarial edge classes are covered when relevant: invalid transitions, duplicate/replayed actions, stale state, boundary data, permission/tenant edges, malformed-but-valid input, concurrency/order changes, and dependency faults.
  7. Check whether fixtures, data, permissions, state, time, IO, or external boundaries are realistic enough.
  8. Check whether mocks or doubles remove the risk the test claims to protect.
  9. Check whether the validation command is the smallest useful loop.
  10. Flag cheaper or higher-signal alternatives.

Read the full file on GitHub · 52 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 8d ago First seen · 52 lines · 32 tokens per session scan A 0b8776c79190

Subscribe to this mod's changes

wio-strategy-critic is an agent published in the GitHub repository workersio/skills (161 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 639 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Other agents, from other repositories

verification-runner

Run project-aware verification loop. Reads mix.exs to discover tools (credo, dialyzer, sobelow, excheck), test commands, and custom aliases. Use proactively after code changes.

oliver-kriska/claude-elixir-phoenix · 44 tokens

edge-case-explorer

Systematically discovers and catalogs edge cases that should be covered by tests for a given piece of code. Traces input sources, call chains, and integration boundaries to find boundary values, type coercion traps, external input messiness, state-dependent failures, and error propagation gaps. Use when exploring how…

testdouble/han · 135 tokens

codebase-explorer

Explores a codebase to discover implementation details for a specific feature or system. Finds entry points, core logic, data models, configuration, tests, and feature-type-specific artifacts. Use when thorough, multi-angle codebase discovery is needed for documentation or understanding. Does not research options or…

testdouble/han · 75 tokens

func-verifier

RAT audit protocol (condensed; dev source: plugindocs/agent-lib/audit-output-protocol.md — plugin-internal, do NOT Read it at runtime).

babyworm/rtl-agent-team · 43 tokens

p5s-coverage-orchestrator

Coverage analysis orchestrator. Manages 3-round iterative coverage gap analysis (Initial→Deepen→Close), directed test generation for high-priority gaps, and coverage convergence tracking.

babyworm/rtl-agent-team · 45 tokens

p5s-func-verify-orchestrator

Tier 3 functional verification orchestrator. Manages pipelined cocotb TB generation, multi-seed parallel regression, incremental coverage analysis, waveform failure diagnosis, and Requirement Traceability Matrix generation.

babyworm/rtl-agent-team · 51 tokens