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 fabriqaai/specs.md --skill design-doc-generategit clone --depth 1 https://github.com/fabriqaai/specs.mdWrote 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/fabriqaai/specs.md/design-doc-generate)<a href="https://agentmods.dev/skills/fabriqaai/specs.md/design-doc-generate"><img src="https://agentmods.dev/badge/skills/fabriqaai/specs.md/design-doc-generate/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/fabriqaai/specs.md/design-doc-generate"><img src="https://agentmods.dev/badge/skills/fabriqaai/specs.md/design-doc-generate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00026 | $0.01232 |
| Opus 5 | $0.00013 | $0.00616 |
| Sonnet 5 | $0.00005 | $0.00246 |
| Haiku 4.5 | $0.00003 | $0.00123 |
Grade A, and why
design-doc-generate 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 9d 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 — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.
<degrees_of_freedom> LOW — Follow the design doc structure precisely. Decisions must have rationale. </degrees_of_freedom>
<output_format>
| Decision | Choice | Rationale |
|----------|--------|-----------|
| ... | ... | ... |
</output_format>
<output_format>
| Risk | Impact | Mitigation |
|------|--------|------------|
| ... | ... | ... |
</output_format>
## Summary
{brief description}
## Key Decisions
{decisions table}
## Technical Approach
{component diagram, API contracts}
## Risks
{risks table}
## Implementation Checklist
{ordered steps}
---
This is Checkpoint 1 of Validate mode.
Approve design? [Y/n/edit]
</output>
</checkpoint>
Route to Builder for Checkpoint 2 (implementation plan)? [Y/n]
</output>
</check>
<check if="response == edit">
<ask>What changes are needed?</ask>
<action>Incorporate feedback</action>
<goto step="8"/>
</check>
<check if="response == n">
<output>Design rejected. What concerns need to be addressed?</output>
<action>Gather feedback, revise approach</action>
<goto step="3"/>
</check>
What ships with it
1 file 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.
- 9d ago First seen · 157 lines · 26 tokens per session scan A 778a7576d489
design-doc-generate is a skill published in the GitHub repository fabriqaai/specs.md (208 stars, last pushed 16d ago), licensed MIT. It adds 26 tokens to every session and 1,232 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 2026-08-30.
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