feature-implementation

feature-implementation is a skill for Claude Code, Codex from KarmaloopAI/Jiva. It costs 37 tokens per session (281 once invoked), scanned A, original, MIT.

Instructions for implementing software features, fixing bugs, and writing production-quality code.

In plain words
What is it for?
Use them for hands-on development work, including creating code, modifying existing code, debugging, testing, and documenting complex logic.
Why use it?
They provide a repeatable process for understanding requirements, changing the right files, handling errors and edge cases, and checking the result.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Install

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.

agentmods
npx agentmods add skills/karmaloopai/jiva/implementation
Any agent
npx skills add KarmaloopAI/Jiva --skill implementation
Clone the repo
git clone --depth 1 https://github.com/KarmaloopAI/Jiva

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 feature-implementation

README.md
[![agentmods](https://agentmods.dev/badge/skills/karmaloopai/jiva/implementation.svg)](https://agentmods.dev/skills/karmaloopai/jiva/implementation)
Your own site
<a href="https://agentmods.dev/skills/karmaloopai/jiva/implementation"><img src="https://agentmods.dev/badge/skills/karmaloopai/jiva/implementation.svg" alt="Measured on agentmods" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 281 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00037 $0.00281
Opus 5 $0.00018 $0.00140
Sonnet 5 $0.00007 $0.00056
Haiku 4.5 $0.00004 $0.00028

Measured 6d ago against content hash 9461bb158047, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

feature-implementation 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 6d 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.

examples/personas/developer/skills/implementation/SKILL.md · 46 lines

What it actually says

Feature Implementation Skill

Overview

Write high-quality, production-ready code for features and bug fixes.

Workflow

  1. Understand Requirements: Parse task requirements thoroughly
  2. Plan Implementation: Identify files to create/modify
  3. Write Code: Implement with best practices:
    • Clean, readable code
    • Proper error handling
    • Type safety
    • Good variable/function names
  4. Verify: Test basic functionality
  5. Document: Add comments for complex logic

Code Quality Standards

  • Follow language idioms and conventions
  • Handle edge cases and errors
  • Use appropriate data structures
  • Keep functions focused and small
  • Add inline comments for complex logic

Tools to Use

  • create_file: For new files
  • edit_file: For modifications
  • view: To read existing code
  • grep_search: To find code patterns
  • run_terminal_command: To run tests

Best Practices

  • Read existing code before making changes
  • Match the project's style and patterns
  • Test changes when possible
  • Leave code better than you found it
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. 6d ago First seen · 46 lines · 37 tokens per session scan A 9461bb158047

Subscribe to this mod's changes

feature-implementation is a skill published in the GitHub repository KarmaloopAI/Jiva (35 stars, last pushed 21d ago), licensed MIT. It adds 37 tokens to every session and 281 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 2026-08-30.

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