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KumoApp: Skill for Claude Code

.agents/skills/build-feature/SKILL.md

build-feature is a skill for Claude Code, Codex from ProjectKumo/KumoApp. It costs 41 tokens per session (546 once invoked), scanned A, original, AGPL-3.0.

A guide for building an iOS feature with ShipSwift component recipes. It applies when a developer wants to create or add functionality to an iPhone or iPad app.

In plain words
What is it for?
Building new iOS features, adding functionality to an existing app, or creating an iOS component from a described requirement.
Why use it?
It gives the coding agent a specific workflow for turning an iOS feature request into implementation work.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is ProjectKumo/KumoApp's own configuration. It tells Claude Code and Codex how to work on KumoApp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything KumoApp configures →

not rated 286repo 5mo ago A scan 41 tokens AGPL-3.0
View source ↗ ProjectKumo/KumoApp usekumo.app
Reuse

Borrowing it

Nothing to install: this file belongs to ProjectKumo/KumoApp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ProjectKumo/KumoApp/main/.agents/skills/build-feature/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/ProjectKumo/KumoApp

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for build-feature

README.md
[![agentmods](https://agentmods.dev/badge/skills/projectkumo/kumoapp/build-feature/github.svg)](https://agentmods.dev/skills/projectkumo/kumoapp/build-feature)
Your own site
<a href="https://agentmods.dev/skills/projectkumo/kumoapp/build-feature"><img src="https://agentmods.dev/badge/skills/projectkumo/kumoapp/build-feature/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.

agentmods 80×15 button for build-feature

Your own site · 80×15
<a href="https://agentmods.dev/skills/projectkumo/kumoapp/build-feature"><img src="https://agentmods.dev/badge/skills/projectkumo/kumoapp/build-feature.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 546 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.00546
Opus 5.5 $0.00016 $0.00218
Sonnet 5.5 $0.00008 $0.00109
Haiku 4.5 $0.00004 $0.00055

Measured 2mo ago against content hash 59cc0a7e8899, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

build-feature 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 2mo 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.

.agents/skills/build-feature/SKILL.md · 48 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

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.

  1. 2mo ago First seen · 48 lines · 41 tokens per session scan A 59cc0a7e8899

Subscribe to this mod's changes

build-feature is a skill published in the GitHub repository ProjectKumo/KumoApp (286 stars, last pushed 5mo ago), licensed AGPL-3.0. It adds 41 tokens to every session and 546 once invoked, about $0.0002 per session on Opus 5.5. 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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Related

build-feature compared with skills from other repositories

build-feature next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
build-featureProjectKumo/KumoAppSkill2865mo agoAGPL-3.0A41Claude Code, Codex
swift-concurrency-projacklandrin/OnlySwitchSkill6.0kyesterdayMITA35Codex
agent-browserx-cmd/x-cmdSkill4.7k6d agoApache-2.0A39Claude Code, Codex
sweetpadsweetpad-dev/sweetpadSkill1.9k2d agoMITA90Claude Code, Codex
Swift Performance Optimization Skilltermio-sh/termioSkill7854d agoMITA68Claude Code, Codex
native-app-profilingtermio-sh/termioSkill7854d agoMITA45Claude Code, Codex
performance-audittermio-sh/termioSkill7854d agoMITA43Claude Code, Codex