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 skills add AsiaOstrich/universal-dev-standards --skill tdd-assistantgit clone --depth 1 https://github.com/AsiaOstrich/universal-dev-standardsWrote 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/asiaostrich/universal-dev-standards/tdd-assistant)<a href="https://agentmods.dev/skills/asiaostrich/universal-dev-standards/tdd-assistant"><img src="https://agentmods.dev/badge/skills/asiaostrich/universal-dev-standards/tdd-assistant/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/asiaostrich/universal-dev-standards/tdd-assistant"><img src="https://agentmods.dev/badge/skills/asiaostrich/universal-dev-standards/tdd-assistant.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00184 | $0.01249 |
| Opus 5.5 | $0.00074 | $0.00500 |
| Sonnet 5.5 | $0.00037 | $0.00250 |
| Haiku 4.5 | $0.00018 | $0.00125 |
Grade A, and why
tdd 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 15d 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 15d ago Changed · +7 lines c0d4c1c341e3
- 1mo ago Changed · +2 lines 4cc67d59c39a
- 1mo ago First seen · 83 lines · 184 tokens per session scan A ab5f5a350696
tdd is a skill published in the GitHub repository AsiaOstrich/universal-dev-standards (80 stars, last pushed today), with no licence file. It adds 184 tokens to every session and 1,249 once invoked, about $0.0007 per session on Opus 5.5. 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 2026-09-03.
Other skills, from other repositories
implement-feature
Implement an approved feature plan with fresh-context slices, TDD, revision-bound evidence, and PR-ready output.
common-subagent-driven-development
Execute multi-task implementation plans by dispatching one bounded implementer per task with independent review gates. Use when implementing plans, executing multi-task PRs, or transitioning from planning to implementation.
common-tdd
Guides quality-first TDD for new behavior, bug fixes, and test changes. Selects the smallest test layer, proves a distinct regression risk, and runs bounded RED-GREEN-REFACTOR verification.
refactor
Safely restructures existing code while preserving behavior through impact analysis and TDD. User-invoked entry point via /refactor; not for autonomous or subagent use.
bugfix
Fixes bugs of any size from hotfixes to complex debugging sessions using root cause diagnosis and TDD. User-invoked entry point via /bugfix; not for autonomous or subagent use.
perf-optimize
Runs profile-driven performance optimization using multi-dimensional parallel analysis and sequential TDD fixes. User-invoked entry point via /perf-optimize; not for autonomous or subagent use.