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 TalissonVitorino/kmp-ios-skills --skill feature-buildergit clone --depth 1 https://github.com/TalissonVitorino/kmp-ios-skillsWrote 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/talissonvitorino/kmp-ios-skills/feature-builder)<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/feature-builder"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/feature-builder/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/talissonvitorino/kmp-ios-skills/feature-builder"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/feature-builder.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 | $0.00078 | $0.01234 |
| Opus 5 | $0.00039 | $0.00617 |
| Sonnet 5 | $0.00016 | $0.00247 |
| Haiku 4.5 | $0.00008 | $0.00123 |
Grade A, and why
feature-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 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 — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Builder (workflow)
A structured 6-phase path for building a mobile feature end to end. This is a workflow guide — it sequences the real skills/agents you already have; it does not call external /feature-* pipeline commands.
Platform auto-detect:
shared/src/commonMain/→ KMP ·*.xcodeproj/*.xcworkspace→ iOS · a modulebuild.gradle(.kts)applyingcom.android.application→ Android. Ambiguous → ask.
The six phases
| # | Phase | Do it with |
|---|---|---|
| 1 | Plan | superpowers:brainstorming → superpowers:writing-plans (or the Plan agent). Output: module breakdown, file list, task order. |
| 2 | Implement (by layer) | Build in dependency order, pulling the matching library skill per layer (below). Drive with superpowers:test-driven-development. |
| 3 | Test | Unit + UI + E2E. mobile-testing (Android/JVM) · ios-testing (iOS) · depth: android-skills:android-testing. |
| 4 | Build & fix | Compile + run tests, fix in a loop (cap ~5 iterations, then escalate). Debug via android-skills:android-debugging. |
| 5 | Review | superpowers:requesting-code-review, or the feature-dev:code-reviewer / pr-review-toolkit agents. Block on security & correctness. |
| 6 | Verify | Run the tests for real, confirm coverage/behaviour, re-run to catch flakiness. superpowers:verification-before-completion. |
Phase 2 — implementation order (layer by layer)
domain → (network ∥ ui) → data → wiring
- domain — models, repository interfaces, use cases returning a typed result (
error-handling-result). - network — API + DTOs (
kmp-networking/ktor-patterns). ui — screens, ViewModels, state (jetpack-compose,swiftui-patterns,swiftui-observation,mvi-architecture). No mutual dependency → do them together. - data — repository impl, mappers, local cache (
kmp-repositories,sqldelight-patterns/room-patterns/swiftdata). - wiring — DI (
kmp-di/android-di-koin), navigation (navigation), manifest/permissions.
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 · 65 lines · 78 tokens per session scan A c6b53bec7c3b
feature-builder is a skill published in the GitHub repository TalissonVitorino/kmp-ios-skills (12 stars, last pushed 18d ago), licensed MIT. It adds 78 tokens to every session and 1,234 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 2026-09-03.
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