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 euxx/claude-skills-for-copilot --skill feature-devgit clone --depth 1 https://github.com/euxx/claude-skills-for-copilotWrote 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/euxx/claude-skills-for-copilot/feature-dev)<a href="https://agentmods.dev/skills/euxx/claude-skills-for-copilot/feature-dev"><img src="https://agentmods.dev/badge/skills/euxx/claude-skills-for-copilot/feature-dev.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 | $0.00033 | $0.01940 |
| Opus 5 | $0.00016 | $0.00970 |
| Sonnet 5 | $0.00007 | $0.00388 |
| Haiku 4.5 | $0.00003 | $0.00194 |
Grade A, and why
feature-dev 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 — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Development
You are helping a developer implement a new feature. Follow a systematic approach: understand the codebase deeply, identify and ask about all underspecified details, design elegant architectures, then implement.
Core Principles
- Ask clarifying questions: Identify all ambiguities, edge cases, and underspecified behaviors. Ask specific, concrete questions rather than making assumptions. Wait for user answers before proceeding. Ask questions early — after understanding the codebase, before designing.
- Understand before acting: Read and comprehend existing code patterns first.
- Read files identified by agents: When launching agents, ask them to return lists of the most important files to read. After agents complete, read those files to build detailed context before proceeding.
- Simple and elegant: Prioritize readable, maintainable, architecturally sound code.
- Use a todo list: Track all progress throughout.
Phase 1: Discovery
Goal: Understand what needs to be built.
Initial request: $ARGUMENTS
Actions:
- Create a todo list with all phases.
- If the feature is unclear, ask the user:
- What problem are they solving?
- What should the feature do?
- Any constraints or requirements?
- Summarize understanding and confirm with user.
Phase 2: Codebase Exploration
Goal: Understand relevant existing code and patterns at both high and low levels.
Actions:
-
Launch 2–3 code-explorer sub-agents in parallel. Each agent should:
- Trace through the code comprehensively, focusing on abstractions, architecture, and flow of control.
- Target a different aspect of the codebase (e.g. similar features, high-level architecture, user experience, testing patterns).
- Return a list of 5–10 key files to read.
Example prompts:
- "Find features similar to [feature] and trace through their implementation comprehensively"
- "Map the architecture and abstractions for [feature area], tracing through the code comprehensively"
- "Analyze the current implementation of [existing feature/area], tracing through the code comprehensively"
- "Identify UI patterns, testing approaches, or extension points relevant to [feature]"
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 · 196 lines · 33 tokens per session scan A 40a758ce5904
feature-dev is a skill published in the GitHub repository euxx/claude-skills-for-copilot (4 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 1,940 once invoked, about $0.0002 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.
Other skills, from other repositories
icon-jetbrains
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vscode-visual-regression
Write Storybook stories and visual regression tests for the Kilo VS Code extension webview UI.
release-jetbrains
Use when releasing the Kilo JetBrains plugin -- resolve a version ("next rc" or explicit), run the prepare workflow, edit and commit a filtered human-readable changelog on the release PR, then watch publish to completion.
kilocode-merge-minimizer
Use when changing shared upstream-owned files to add Kilo-specific behavior, editing kilocodechange markers in shared code, or moving additive behavior out of shared code to reduce upstream merge conflicts. Do not use for changes confined to Kilo-owned paths such as packages/kilo-vscode/ or packages/kilo-ui/.
chart
Use when the user asks to visualize data with charts, graphs, or plots using the chart tool (bar, line, scatter, pie, time series, etc.).
gh-issues
Use when creating, triaging, or commenting on GitHub issues for the Kilo VS Code extension or JetBrains plugin via gh. Covers issue templates, project board assignment, title conventions, and required gh scopes.