vscode-sidebar-terminal: Skill for Claude Code

.agents/skills/anthropic-skill-creator/SKILL.md

anthropic-skill-creator is a skill for Claude Code, Codex from s-hiraoku/vscode-sidebar-terminal. It costs 77 tokens per session (1,057 once invoked), scanned A, original, MIT.

A guide for creating and improving skills for Claude or Codex agents. It covers when a skill should activate, how its instructions should be structured, and how to test its behavior.

In plain words
What is it for?
Use it to design a new skill, revise its SKILL.md, add scripts or reference files, or test whether its triggers and workflows work correctly.
Why use it?
It helps avoid skills that trigger at the wrong times, give unreliable instructions, or become difficult to maintain.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents); mentions Codex.

This is s-hiraoku/vscode-sidebar-terminal's own configuration. It tells Claude Code and Codex how to work on vscode-sidebar-terminal 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 vscode-sidebar-terminal configures →

Reuse

Borrowing it

Nothing to install: this file belongs to s-hiraoku/vscode-sidebar-terminal. 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/s-hiraoku/vscode-sidebar-terminal/main/.agents/skills/anthropic-skill-creator/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/s-hiraoku/vscode-sidebar-terminal

Made for: Claude Code, Codex.

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 anthropic-skill-creator

README.md
[![agentmods](https://agentmods.dev/badge/skills/s-hiraoku/vscode-sidebar-terminal/anthropic-skill-creator/github.svg)](https://agentmods.dev/skills/s-hiraoku/vscode-sidebar-terminal/anthropic-skill-creator)
Your own site
<a href="https://agentmods.dev/skills/s-hiraoku/vscode-sidebar-terminal/anthropic-skill-creator"><img src="https://agentmods.dev/badge/skills/s-hiraoku/vscode-sidebar-terminal/anthropic-skill-creator/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 anthropic-skill-creator

Your own site · 80×15
<a href="https://agentmods.dev/skills/s-hiraoku/vscode-sidebar-terminal/anthropic-skill-creator"><img src="https://agentmods.dev/badge/skills/s-hiraoku/vscode-sidebar-terminal/anthropic-skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 77 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,057 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00077 $0.01057
Opus 5 $0.00039 $0.00528
Sonnet 5 $0.00015 $0.00211
Haiku 4.5 $0.00008 $0.00106

Measured 10d ago against content hash 56b33073f4db, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

anthropic-skill-creator 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.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/new_skill.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.agents/skills/anthropic-skill-creator/SKILL.md · 163 lines

How it starts

The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Create Skills

Build skills that trigger correctly, execute reliably, and stay concise.

Core Principles

  • Use progressive disclosure:
    • Frontmatter (name, description) for trigger selection.
    • SKILL.md body for core workflow.
    • references/ for deep details loaded only when needed.
  • Keep skills composable: avoid assumptions that this is the only active skill.
  • Prefer deterministic scripts for fragile validation logic.

Workflow

  1. Define 2-3 concrete use cases.
  2. Draft trigger-strong frontmatter.
  3. Design reusable resources (scripts/, references/, assets/).
  4. Write actionable instructions and error handling.
  5. Run triggering/functional/performance tests.
  6. Iterate based on under-trigger/over-trigger signals.

1) Define Use Cases

Capture for each use case:

  • User phrasing (what they actually say)
  • Intended result
  • Multi-step workflow and required tools (built-in and/or MCP)
  • Failure points that need guardrails

If use cases are vague, ask targeted follow-up questions before authoring.

2) Frontmatter Design (Most Important)

Write only what is needed to trigger correctly.

Required fields:

  • name: kebab-case, matches folder name
  • description: include BOTH
    • What the skill does
    • When to use it (trigger phrases/context/file types)

Description formula:

  • [What it does] + [When to use it] + [Key capabilities]

Good pattern:

  • "Processes PDF legal documents for contract review. Use when users ask for clause extraction, risk flags, or redline summaries from .pdf contracts."

Bad pattern:

  • "Helps with projects."

Precision controls:

  • Add negative triggers to reduce over-triggering.
  • Mention relevant file types when applicable.
  • Keep wording aligned with real user phrases from use cases.

3) Resource Plan

  • scripts/: deterministic checks/transforms used repeatedly
  • references/: large docs, domain logic, variant-specific guidance
  • assets/: templates and artifacts used in outputs

Rules:

  • Keep SKILL.md compact; link to references/.
  • Avoid extra docs in skill folder (README.md, changelog, etc.).

Read the full file on GitHub · 163 lines

Files

What ships with it

8 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. 10d ago First seen · 163 lines · 77 tokens per session scan A 56b33073f4db

Subscribe to this mod's changes

anthropic-skill-creator is a skill published in the GitHub repository s-hiraoku/vscode-sidebar-terminal (21 stars, last pushed 2d ago), licensed MIT. It adds 77 tokens to every session and 1,057 once invoked, about $0.0004 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 2026-09-01.

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