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/alexmond/alexmskills/buildernpx skills add alexmond/alexmskills --skill buildergit clone --depth 1 https://github.com/alexmond/alexmskillsWrote 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/alexmond/alexmskills/builder)<a href="https://agentmods.dev/skills/alexmond/alexmskills/builder"><img src="https://agentmods.dev/badge/skills/alexmond/alexmskills/builder.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 | $0.00070 | $0.00303 |
| Opus 5 | $0.00035 | $0.00151 |
| Sonnet 5 | $0.00014 | $0.00061 |
| Haiku 4.5 | $0.00007 | $0.00030 |
Grade A, and why
builder 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
Build a complete application from scratch
Target: $ARGUMENTS
- Load the role. If
.claude/roles/builder.mdexists, read it — it is the canonical, evolving copy. If not, read role.md (the seed shipped with this skill), copy it verbatim to.claude/roles/builder.md, then proceed. - Apply it. Adopt the Charter and Body; honor every entry under
## Learnings (core)and## Learnings (solo). - Work the target following the Body's method and deliverables.
- Capture a learning. If this run surfaced a durable, reusable lesson (a fix that took more than one cycle, a stack- or repo-specific gotcha, a stated user preference), append one line under
## Learnings (solo)in.claude/roles/builder.md:- YYYY-MM-DD — <one sentence>. Don't log routine one-pass outcomes.
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.
- 5d ago First seen · 16 lines · 70 tokens per session scan A 8ef1afdb9d79
builder is a skill published in the GitHub repository alexmond/alexmskills (6 stars, last pushed today), licensed MIT. It adds 70 tokens to every session and 303 once invoked, about $0.0003 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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