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 madeinoz67/madeinoz-knowledge-system --skill skill-developergit clone --depth 1 https://github.com/madeinoz67/madeinoz-knowledge-systemWrote 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/madeinoz67/madeinoz-knowledge-system/skill-developer)<a href="https://agentmods.dev/skills/madeinoz67/madeinoz-knowledge-system/skill-developer"><img src="https://agentmods.dev/badge/skills/madeinoz67/madeinoz-knowledge-system/skill-developer/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.
<a href="https://agentmods.dev/skills/madeinoz67/madeinoz-knowledge-system/skill-developer"><img src="https://agentmods.dev/badge/skills/madeinoz67/madeinoz-knowledge-system/skill-developer.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00097 | $0.03001 |
| Opus 5.5 | $0.00039 | $0.01200 |
| Sonnet 5.5 | $0.00019 | $0.00600 |
| Haiku 4.5 | $0.00010 | $0.00300 |
Grade A, and why
skill-developer 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 1mo 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.
This is a copy
80% identical to skill-developer — 91 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 432 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Developer Guide
Purpose
Comprehensive guide for creating and managing skills in Claude Code with auto-activation system, following Anthropic's official best practices including the 500-line rule and progressive disclosure pattern.
When to Use This Skill
Automatically activates when you mention:
- Creating or adding skills
- Modifying skill triggers or rules
- Understanding how skill activation works
- Debugging skill activation issues
- Working with skill-rules.json
- Hook system mechanics
- Claude Code best practices
- Progressive disclosure
- YAML frontmatter
- 500-line rule
System Overview
Two-Hook Architecture
1. UserPromptSubmit Hook (Proactive Suggestions)
- File:
.claude/hooks/codanna/skill-activation-prompt.ts - Trigger: BEFORE Claude sees user's prompt
- Purpose: Suggest relevant skills based on keywords + intent patterns
- Method: Injects formatted reminder as context (stdout → Claude's input)
- Use Cases: Topic-based skills, implicit work detection
2. PreToolUse Hook - Read Validation (Resource Management)
- File:
.claude/hooks/codanna/pre_read_use.js - Trigger: BEFORE Read tool executes
- Purpose: Validate Read operations to prevent excessive line reads
- Method: Checks requested line limit against thresholds, blocks/warns on large reads
- Use Cases: Prevent token waste, encourage efficient file reading patterns
- Thresholds:
- Allow: ≤400 lines (silent)
- Warn: 401-600 lines (logged, shown to Claude)
- Block: >600 lines (operation blocked)
Configuration File
Location: .claude/skills/skill-rules.json
Defines:
- All skills and their trigger conditions
- Enforcement levels (block, suggest, warn)
- File path patterns (glob)
- Content detection patterns (regex)
- Skip conditions (session tracking, file markers, env vars)
Skill Types
1. Guardrail Skills
Purpose: Enforce critical best practices that prevent errors
Characteristics:
- Type:
"guardrail" - Enforcement:
"block" - Priority:
"critical"or"high" - Block file edits until skill used
- Prevent common mistakes (column names, critical errors)
- Session-aware (don't repeat nag in same session)
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 432 lines · 97 tokens per session scan A 94d5b217b75c
skill-developer is a skill published in the GitHub repository madeinoz67/madeinoz-knowledge-system (5 stars, last pushed 6mo ago), licensed MIT. It adds 97 tokens to every session and 3,001 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 80% identical to skill-developer, differing in 91 lines, and is treated as a copy.
Other skills, from other repositories
sandbase
Access 2,000+ AI models and API tools through one MCP interface for inference, media generation, search, scraping, embeddings, social data, and structured retrieval. Use sandbasediscover before building custom integrations or declaring external data inaccessible; prefer an existing dedicated tool or API key when the…
graph-mutation-plan
Cookbook for composing an applygraphmutations plan — stable entitykey patterns, the canonical label/edge vocabulary, evidence/invalidation/confidence discipline, and a worked example. Load this when building a non-trivial mutation plan.
convex-insights
Query a running Convex app's logs + health in natural language (official MCP): failures, slow/expensive functions, deploy causality — scoped, evidence-backed, with a dashboard deep link.
convex-add
Add a capability to the CURRENT Convex app — consults the served Convex capability catalog for always-current procedures (billing, crons, auth, agent, search, …); falls back to built-in hosting or @convex-dev component search. TRIGGER when the user runs /add, or asks to add hosting/publishing or any backend capability…
openclaw-design-system
Compatibility alias for existing OpenClaw installations that now applies Carapace semantic tokens, themes, shared CSS foundations, consumer adapters, and established local primitives.
unity-profiler
Capture read-only Unity runtime performance snapshots.