skill-improver

skill-improver is an agent for Claude Code from athola/claude-night-market. It costs 60 tokens per session (4,536 once invoked), scanned A, original, MIT.

An agent that uses execution records, user feedback, and a LEARNINGS.md file to suggest and check improvements to other skills. It can also use stored performance trends and explanations of likely causes.

In plain words
What is it for?
Use it to review all skills, one named skill, or the most important skills; rank possible improvements; and validate proposed changes using past execution data.
Why use it?
It helps turn repeated failures and user complaints into documented improvement proposals, instead of relying on manual review. A dry-run option allows changes to be considered before they are applied.

Agent for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter; reads .claude/ paths.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 plugins/abstract/scripts/token_estimator.py "$skill_file".

Part of the abstract plugin — 16 skills, 17 commands, 5 agents, 4 hooks shipped together

Good fit Use it to review all skills, one named skill, or the most important skills; rank possible improvements; and validate proposed changes using past execution data.

Compare 6 agents from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/athola/claude-night-market
agentmods
npx agentmods add agents/athola/claude-night-market/skill-improver

Made for: Claude Code.

Or install abstract, the plugin that ships this one along with the rest of its 16 skills, 17 commands, 5 agents, 4 hooks.

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 skill-improver

README.md
[![agentmods](https://agentmods.dev/badge/agents/athola/claude-night-market/skill-improver/github.svg)](https://agentmods.dev/agents/athola/claude-night-market/skill-improver)
Your own site
<a href="https://agentmods.dev/agents/athola/claude-night-market/skill-improver"><img src="https://agentmods.dev/badge/agents/athola/claude-night-market/skill-improver/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 skill-improver

Your own site · 80×15
<a href="https://agentmods.dev/agents/athola/claude-night-market/skill-improver"><img src="https://agentmods.dev/badge/agents/athola/claude-night-market/skill-improver.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 60 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 4,536 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 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 $0.00060 $0.04536
Opus 5 $0.00030 $0.02268
Sonnet 5 $0.00012 $0.00907
Haiku 4.5 $0.00006 $0.00454

Measured 10d ago against content hash b11e6a743837, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

skill-improver 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 10d 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.

plugins/abstract/agents/skill-improver.md · 679 lines

How it starts

The opening of the file, as written. The whole thing — 679 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill Improver Agent

Automatically improves skills based on execution logs, user evaluations, and aggregated insights from LEARNINGS.md. Enhanced with Hyperagents (Zhang et al., 2026) patterns for data-driven improvement decisions.

Purpose

Part of Issue #69 Phase 5 - Self-Improvement Loop. This agent closes the observability loop by acting on insights gathered from:

  • Phase 1: Execution logs (failure rates, duration)
  • Phase 2: Qualitative evaluations (ratings, friction, suggestions)
  • Phase 3: LEARNINGS.md aggregation (patterns, common issues)
  • Phase 6: Hyperagents integration - PerformanceTracker trends, ImprovementMemory hypotheses, metacognitive self-modification

Inputs

  • mode: all (default), skill:<name>, top:<N>, dry-run, or --metacognitive
  • LEARNINGS.md path: ~/.claude/skills/LEARNINGS.md
  • auto_implement: Boolean - automatically implement or prompt for confirmation

Workflow

0. Load Hyperagents data (before LEARNINGS.md)

Before loading LEARNINGS.md, consult the persistent improvement memory and performance tracker for context that should inform this improvement cycle.

from pathlib import Path

MEMORY_FILE = Path.home() / ".claude/skills/improvement_memory.json"
TRACKER_FILE = Path.home() / ".claude/skills/performance_history.json"

# Load improvement memory (if available)
improvement_context = {}
try:
    from abstract.improvement_memory import ImprovementMemory

    memory = ImprovementMemory(MEMORY_FILE)

    # Get strategies that worked and failed
    effective = memory.get_effective_strategies()
    failed = memory.get_failed_strategies()

    improvement_context = {
        "effective_strategies": effective,
        "failed_strategies": failed,
        "effectiveness_rate": (
            len(effective) / (len(effective) + len(failed))
            if (effective or failed)
            else None
        ),
    }
except ImportError:
    pass  # Module not available

# Load performance tracker (if available)
tracker_context = {}
try:
    from abstract.performance_tracker import PerformanceTracker

    tracker = PerformanceTracker(TRACKER_FILE)

    # Identify skills with degrading trends
    degrading_skills = []
    for entry in tracker.history:
        skill_ref = entry["skill_ref"]
        trend = tracker.get_improvement_trend(skill_ref)
        if trend is not None and trend < -0.05:
            degrading_skills.append(
                {
                    "skill": skill_ref,
                    "trend": trend,
                }
            )

    tracker_context = {
        "degrading_skills": degrading_skills,
        "best_performers": tracker.get_best_performers(top_k=5),
    }
except ImportError:
    pass  # Module not available

Read the full file on GitHub · 679 lines

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. 10d ago First seen · 679 lines · 60 tokens per session scan A b11e6a743837

Subscribe to this mod's changes

skill-improver is an agent published in the GitHub repository athola/claude-night-market (337 stars, last pushed today), licensed MIT. It adds 60 tokens to every session and 4,536 once invoked, about $0.0003 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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