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 agentmods add instructions/mckruz/claude-code-mastery/claude-mdgit clone --depth 1 https://github.com/MCKRUZ/claude-code-masteryWrote 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/instructions/mckruz/claude-code-mastery/claude-md)<a href="https://agentmods.dev/instructions/mckruz/claude-code-mastery/claude-md"><img src="https://agentmods.dev/badge/instructions/mckruz/claude-code-mastery/claude-md.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 | $0.00901 | $0.00901 |
| Opus 5 | $0.00451 | $0.00451 |
| Sonnet 5 | $0.00180 | $0.00180 |
| Haiku 4.5 | $0.00090 | $0.00090 |
Grade A, and why
claude-code-mastery CLAUDE.md 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 4d 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 — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Nexus Intelligence
Auto-updated by Nexus — do not edit this section manually. Last sync: 2026-04-23
Portfolio
| Project | Description | Tech |
|---|---|---|
| jarvis-stack | — | — |
| personal-brand-assistant | — | — |
| project-avatar | — | — |
| ComfyUI | ComfyUI — the main local ComfyUI installation at E:/ComfyUI-Easy-Install/Co… | — |
| matthewkruczek-ai | matthewkruczek.ai — static personal brand website for Matthew Kruczek (EY M… | — |
| claude-code-mastery (this) | Claude Code Mastery — the definitive Claude Code setup and configuration sk… | — |
| Nexus | Nexus is a local-first cross-project intelligence layer for Claude Code. | — |
| +32 inactive | — | — |
Context from Nexus
Roadmap: Next Features
User-approved feature ideas (2026-03-24):
- MCP Tool Intelligence Layer — Nexus sits on mcp-hub, learns which tools succeed/fail per project, i… Tags: roadmap, features, mcp-hub, planning
Backlog: Show all active MCP servers in Claude Config tab
The Claude Config dashboard page only shows MCP servers from settings.json/settings.local.json, not the full set of running servers (plugins + projec… Tags: backlog, dashboard, mcp, claude-config
Token Budget Optimization Session - 2026-03-18
Token Budget Optimizations Applied
1. Portfolio Table Filter (claude-md-sync.ts)
- Before: All 35+ projects listed in every CLAUDE.md sync (~… Tags: token-budget, skills, portfolio, optimization
Session Insights - 2026-03-17
Session Insights - 2026-03-17
Scope: 20 sessions, ~1 month, 670 total messages, 33.5 avg msgs/session
Top Projects
- OpenClaw — 5 s… Tags: insights, sessions, analytics
OpenClaw Ollama Fallback & Stop Hook JSON Validation Fix
(1) OpenClaw agent fallback chain requires tool-capable models; dolphin-llama3 doesn't support tools so was removed; llama3.1:8b being pulled as Olla… Tags: openclaw, ollama, hooks, bug-fix
Recorded Decisions
- [security] Sanitize and rotate credentials after eval runs that may expose secrets
During test case TC-003, a real GitHub PAT was exposed in skill output. Established practice to rotate credentials and document secret exposure risks in eval framework.
- [security] Sanitize eval test harness to prevent credential leakage from settings files
Eval run exposed GitHub PAT token when skill accessed actual settings.json during MCP config test
- [security] Include platform-aware syntax validation in evaluations — specifically test Win…
TC-005 and TC-003 explicitly validate Windows-compatible output; 15% of benchmark criteria allocated to platform awareness
- [architecture] Add failure-mode test cases for adversarial input and edge cases before finaliz…
After initial 5 test cases passed at 100%, added TC-006, TC-007, TC-008 to test adversarial users, contradictory platform info, and cold-start scenarios. Discovered that robustness under adversarial conditions should be weighted (10%).
- [architecture] Use anchored, objective assertion types for eval scoring instead of subjective …
Initial eval used vague assertions like 'sequence_check' and subjective descriptions. Refactored to use concrete assertion types: contains, regex, question_before_code (line position), json_valid, token_limit to reduce scoring ambiguity.
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.
- 4d ago First seen · 67 lines · 901 tokens per session scan A df6c02b9fbcc
claude-code-mastery CLAUDE.md is an instructions file published in the GitHub repository MCKRUZ/claude-code-mastery (11 stars, last pushed 4mo ago), licensed MIT. It adds 901 tokens to every session, about $0.0045 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.
Other instructions, from other repositories
harness-engineering CLAUDE.md
Instructions for jrenaldi79/harness-engineering, covering claude.md, project overview, core features, essential commands and testing.
ruledoctor AGENTS.md
Instructions for syf2211/ruledoctor, a project described as: Agent Skill: read CLAUDE.md & project rules before coding. Optional CLI audit + hooks. Claude/Codex/Cursor.
ruledoctor CLAUDE.md
Instructions for syf2211/ruledoctor, covering 项目规则（ruledoctor 自动生成，请按需修改） and 硬性规则.
vibe-coding-rules CLAUDE.md
Instructions for yerdaulet-damir/vibe-coding-rules, covering claude.md — vibecodex, project purpose, architecture (mandatory), repositories/protocols.py and services/wallet/user.py.
vibe-27 AGENTS.md
AGENTS.md instructions for fatalex27/vibe-27, covering vibe-27 behavioral guidelines, 1. editor, not typist, 2. intention over implementation, 3. trust and verify and 4. think before coding.
lynxprompt-vscode CLAUDE.md
Claude Code instructions for GeiserX/lynxprompt-vscode, covering claude.md — lynxprompt vs code, tech stack, development, architecture and key commands.