improve-skill

A workflow for improving an existing coding-agent skill by combining its source, user feedback, research, testing, and review. It then creates a revised skill and compares it with the original.

In plain words
What is it for?
Use it to research, plan, build, test, compare, and package an improved version of a skill, including its documentation and visual branding.
Why use it?
It provides a repeatable way to find weaknesses in a skill and check whether changes actually improve its results.

Plugin for Claude Code

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.

Claude Code
/plugin marketplace add fledgeling-co/fledgeling-plugins
agentmods
npx agentmods add plugins/fledgeling-co/fledgeling-plugins/improve-skill
Clone the repo
git clone --depth 1 https://github.com/fledgeling-co/fledgeling-plugins

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

improve-skill 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 yesterday.

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.

plugins/improve-skill/.claude-plugin/plugin.json · 10 lines

What it actually says

{
  "name": "improve-skill",
  "description": "End-to-end skill-improvement pipeline: source skill + user feedback + paid/free Dossier deep-research panel (read in full, citations verified) merged into a plan; the improved skill built as a new plugin; proven with comparative structural evals and a blind multi-family AI judge panel (CLIs + APIs, keys via 1Password); iterated on findings with blind re-judging; then the full brand treatment (user-chosen name and icon concept, mac-design-studio 3-engine icon with audit.html, composed retina banners, Luke-voice README/EVALS with succinct-then-deep comparison, root-README entry) and shipped.",
  "version": "1.3.0",
  "author": {
    "name": "Fledgeling",
    "email": "[email protected]"
  }
}
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. yesterday First seen · 10 lines scan A abaab2cee5c5

Subscribe to this mod's changes

improve-skill is a plugin published in the GitHub repository fledgeling-co/fledgeling-plugins (2 stars, last pushed yesterday), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.