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.
npx agentmods add skills/joinwell52-ai/codeflowmu-open/test-selectionnpx skills add joinwell52-AI/CodeFlowMu-open --skill test-selectiongit clone --depth 1 https://github.com/joinwell52-AI/CodeFlowMu-openWrote 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.
[](https://agentmods.dev/skills/joinwell52-ai/codeflowmu-open/test-selection)<a href="https://agentmods.dev/skills/joinwell52-ai/codeflowmu-open/test-selection"><img src="https://agentmods.dev/badge/skills/joinwell52-ai/codeflowmu-open/test-selection.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00035 | $0.00275 |
| Opus 5 | $0.00017 | $0.00138 |
| Sonnet 5 | $0.00007 | $0.00055 |
| Haiku 4.5 | $0.00003 | $0.00028 |
Grade A, and why
test-selection 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 3d 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.
What it actually says
Test Selection
When to use
Use after planning or making a change to decide which checks should run and which risks remain if some checks are skipped.
Rules
- Match test scope to blast radius.
- For single-module logic, run the closest unit tests first.
- For shared runtime/router/API behavior, add or run package-level tests.
- For UI/browser-visible behavior, include Playwright or browser verification when feasible.
- Run typecheck when changing exported types or TypeScript contracts.
- Name skipped checks and why they were skipped.
Required output
When reporting, include:
- Checks run.
- Checks skipped.
- Why the selected scope is sufficient.
- Residual risk.
Forbidden actions
- Do not say "tested" without naming the check.
- Do not rely only on snapshots or static reading for interactive UI behavior.
- Do not run unrelated expensive suites just to look thorough when a narrower suite proves the change.
Minimal example
Focused: SkillContextRouter.test.ts
Broader: AgentPlaybookCatalog.test.ts because manifest shape changed
Skipped: full shell typecheck due known pre-existing errors
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.
- 3d ago First seen · 44 lines · 35 tokens per session scan A 9a991057ac04
test-selection is a skill published in the GitHub repository joinwell52-AI/CodeFlowMu-open (2 stars, last pushed 9d ago), licensed MIT. It adds 35 tokens to every session and 275 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 2026-08-31.
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