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 commands/intense-visions/harness-engineering/detect-design-driftgit clone --depth 1 https://github.com/Intense-Visions/harness-engineeringWrote 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/commands/intense-visions/harness-engineering/detect-design-drift)<a href="https://agentmods.dev/commands/intense-visions/harness-engineering/detect-design-drift"><img src="https://agentmods.dev/badge/commands/intense-visions/harness-engineering/detect-design-drift.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 | $0.00046 | $0.00318 |
| Opus 5 | $0.00023 | $0.00159 |
| Sonnet 5 | $0.00009 | $0.00064 |
| Haiku 4.5 | $0.00005 | $0.00032 |
Grade A, and why
harness:detect-design-drift 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 5d 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
Phases:
- scan: Load tokens.json and DESIGN.md registry; walk candidate files
- apply_rules: Run DRIFT-T* and DRIFT-P* rules per file
- report: Aggregate severity, format findings, persist to graph
<execution_context> @agents/skills/claude-code/detect-design-drift/SKILL.md @agents/skills/claude-code/detect-design-drift/skill.yaml </execution_context>
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.
- 5d ago First seen · 39 lines · 46 tokens per session scan A 472a7f00e2d3
harness:detect-design-drift is a command published in the GitHub repository Intense-Visions/harness-engineering (20 stars, last pushed today), licensed MIT. It adds 46 tokens to every session and 318 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.
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