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 valsecchi75/project-scaffolder --skill design-firstgit clone --depth 1 https://github.com/valsecchi75/project-scaffolderWrote 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/valsecchi75/project-scaffolder/design-first)<a href="https://agentmods.dev/skills/valsecchi75/project-scaffolder/design-first"><img src="https://agentmods.dev/badge/skills/valsecchi75/project-scaffolder/design-first.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 5.1 | $0.00083 | $0.00765 |
| Opus 5 | $0.00042 | $0.00382 |
| Sonnet 5 | $0.00017 | $0.00153 |
| Haiku 4.5 | $0.00008 | $0.00076 |
Grade A, and why
design-first 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.
How it starts
The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design First — The Design Gate
Overview
Projects fail at execution when design questions surface mid-implementation. This skill forces the design conversation BEFORE the specialist writes code — and gives the approved design authority to revise decisions made at scaffold time, when knowledge was thinnest.
Core principle: the scaffold is an informed draft; the first operational design is where the rules truly settle.
When the gate triggers (called by Cortex Step 3b)
| Condition | Behavior |
|---|---|
| First operational task of the current phase | MANDATORY |
| Complexity = Complex | MANDATORY |
| Complexity = Medium | Proposed — user may skip with --no-design |
| Trivial | Skipped |
The Design Dialogue
- Context read: CLAUDE.md (including Working Agreements),
docs/phases/PHASE-{N}-execution.md, the design spec, relevant wiki pages. Never ask what these already answer. - Questions — ONE at a time, max 5. Prefer multiple choice. Mode-aware: Normal asks all; Autopilot only the critical ones (irreversible choices, cost, genuinely missing requirements); Autonomous skips to step 3 and tags assumptions
[HYPOTHESIS]. - 2-3 approaches with trade-offs and an explicit recommendation, recommended option first.
- Sectioned design: architecture of the change, data flow, error handling, verification plan. Ask after each section whether it looks right.
- Approval → write
docs/design/TASK-{id}-design.md(compact, ≤80 lines) → execution proceeds with the design as the specialist's primary context.
Rule-Revision Authority (the key power)
The approved design MAY amend scaffold-era artifacts — with full traceability:
| Artifact | How |
|---|---|
| Execution Doc activities | Add / split / re-scope activities; update token estimates |
wiki/architecture.md, wiki/tech-stack.md |
Update affected sections; mark superseded content ~~strikethrough~~ |
wiki/product/decisions.md |
New DEC-NNN tagged [DESIGN-REVISION], citing the superseded DEC |
| Working Agreements (CLAUDE.md) | Only with explicit user confirmation |
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.
- 8d ago First seen · 59 lines · 83 tokens per session scan A e5114d251bde
design-first is a skill published in the GitHub repository valsecchi75/project-scaffolder (9 stars, last pushed 1mo ago), licensed MIT. It adds 83 tokens to every session and 765 once invoked, about $0.0004 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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