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/matrixfounder/agentic-development/vdd-adversarialnpx skills add MatrixFounder/Agentic-development --skill vdd-adversarialgit clone --depth 1 https://github.com/MatrixFounder/Agentic-developmentWhat 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 | $0.00027 | $0.01287 |
| Opus 5 | $0.00014 | $0.00643 |
| Sonnet 5 | $0.00005 | $0.00257 |
| Haiku 4.5 | $0.00003 | $0.00129 |
Grade A, and why
vdd-adversarial 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VDD Adversarial
1. Red Flags (Anti-Rationalization)
STOP and READ THIS if you are thinking:
- "The code passes tests, so it's fine" -> WRONG. Tests only cover what the author imagined. You MUST find what they missed.
- "This edge case is unlikely" -> WRONG. Unlikely ≠ impossible. If it crashes, it WILL crash in production.
- "The happy path works, that's enough" -> WRONG. Adversarial review exists to destroy happy-path assumptions.
- "I'll skip the template, it's just a quick review" -> WRONG. Every critique MUST use
assets/template_critique.md.
2. VDD Methodology Context
This skill implements the Iterative Adversarial Refinement phase ("The Roast") from the VDD methodology.
Your Role: You are the Adversary. The Builder has already passed the Verification Loop (tests + HITL). Your job is to find what survived that phase.
Key Principles (see references/vdd-methodology.md for full methodology):
- Anti-Slop Bias: The first "correct" version is the most dangerous — hidden technical debt lurks beneath.
- Exhaustive Reporting (supersedes "Forced Negativity"): report every issue, including low-confidence ones, with confidence + severity attached — filtering happens downstream, never in the reviewer's head. Zero tolerance for "lazy" AI patterns (placeholder comments, generic error handling, inefficient loops).
- Context Resetting: Each adversarial review MUST use a fresh context window. Why (documented mechanisms, audit-067 C-02): multi-turn assumption lock-in — models lock onto early assumptions and degrade ~39% vs single-turn on the same tasks (arXiv:2505.06120); context rot — accumulated history dilutes attention as context grows (Chroma 2025); pushback-driven sycophantic belief updates within a session (TRUTH DECAY / SYCON-Bench). A fresh window restores single-turn rigor.
- Linear Accountability: Every line of code MUST trace to a corresponding issue and verification step.
Empirical positioning (ab-experiment-075, pre-registered rule 3): this skill is a precision tool, not a recall lever. Against a plain exhaustive baseline ("report everything with confidence + severity") the adversarial scaffolding scored −6.9pp recall but −16% false positives and a 3.9% vs 13.0% bikeshedding ratio (N=3, 24 sealed seeded bugs —
docs/reviews/ab-experiment-075.md). Load it when noise/FP cost dominates (triage queues, high-volume review); for recall-critical passes prefer the plain exhaustive prompt, or/vdd-multiwhen class-complete coverage justifies 3× cost.
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.
- 2d ago First seen · 66 lines · 27 tokens per session scan A 4db0341d66f1
vdd-adversarial is a skill published in the GitHub repository MatrixFounder/Agentic-development (5 stars, last pushed 20d ago), licensed Apache-2.0. It adds 27 tokens to every session and 1,287 once invoked, about $0.0001 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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