claude-101: Skill for Claude Code

.claude/skills/claude-101-mastery/SKILL.md

claude-101-mastery is a skill for Claude Code from claude-world/claude-101. It costs 55 tokens per session (2,441 once invoked), scanned B, original, MIT.

A workflow skill that selects structured methods and calculations from the Claude 101 MCP server for 24 writing, analysis, coding, and business tasks. The server provides methodology and locally computed results.

In plain words
What is it for?
Use it for supported tasks such as code analysis, SQL parsing, statistics, financial calculations, text analysis, and scoring.
Why use it?
It gives tasks a defined process and data-based calculations instead of relying only on free-form answers.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

This is claude-world/claude-101's own configuration. It tells Claude Code how to work on claude-101 itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything claude-101 configures →

Reuse

Borrowing it

Nothing to install: this file belongs to claude-world/claude-101. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/claude-world/claude-101/main/.claude/skills/claude-101-mastery/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/claude-world/claude-101

Made for: Claude Code.

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 claude-101-mastery

README.md
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Your own site
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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 claude-101-mastery

Your own site · 80×15
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Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,441 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00055 $0.02441
Opus 5 $0.00028 $0.01221
Sonnet 5 $0.00011 $0.00488
Haiku 4.5 $0.00006 $0.00244

Measured 12d ago against content hash 5ae3ce904605, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade B, and why

claude-101-mastery scanned grade B with 1 finding 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 12d 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.

Asks the agent to reveal its instructionsmediumSystem prompt leakage

Directions to print, repeat or translate the system prompt extract configuration the operator did not intend to expose.

Before executing any use case, load the relevant reference file for that domain. Each file contains the exact tool call parameters, field-by-field workflow, and output instructions:
.claude/skills/claude-101-mastery/SKILL.md · 134 lines

How it starts

The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude 101 Mastery

This skill provides the optimal workflow for 24 use cases powered by the claude-101 MCP server. Each use case follows the same pattern: call the MCP tool first to get structured data and computation, then use that data to produce a superior final output.

The claude-101 MCP server provides 27 tools (3 meta + 24 use-case tools) that perform real local computation — statistics, code analysis, SQL parsing, financial math, text analysis, and scoring — and return structured JSON.

Core Principle

Always call the MCP tool FIRST before writing the final output. The tool provides two things that enhance the quality of the response:

  1. Methodology — structured frameworks, best practices, section templates, and checklists that guide the approach to each use case. Following these frameworks ensures a professional-grade result that covers all standard elements.

  2. Computation — precise metrics (scores, rankings, statistics, parsed data) that the user cannot get from natural language generation alone. These numbers ground the response in verifiable data.

Never skip the tool call. Never attempt to compute statistics, parse structured data, or calculate financial metrics manually. The tool handles computation; the final writing and reasoning come from Claude.

Workflow Pattern

For every use case, follow these five steps:

  1. Identify the matching MCP tool from the mapping table below
  2. Call the tool with the user's input as parameters
  3. Read every field in the result — each exists for a reason
  4. Produce the final output informed by both the methodology and the computed data
  5. Present key metrics (scores, rankings, statistics) explicitly to the user

When the tool returns both a template/scaffold AND computed analysis, use the template as a structural guide (do not copy it verbatim) and weave the computed metrics into the final output. The combination of professional structure and precise data is what makes the output superior.

Read the full file on GitHub · 134 lines

Files

What ships with it

4 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.

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. 12d ago First seen · 134 lines · 55 tokens per session scan B 5ae3ce904605

Subscribe to this mod's changes

claude-101-mastery is a skill published in the GitHub repository claude-world/claude-101 (5 stars, last pushed 5mo ago), licensed MIT. It adds 55 tokens to every session and 2,441 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (asks the agent to reveal its instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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