Borrowing it
Nothing to install: this file belongs to changoo89/claude-pilot. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/changoo89/claude-pilot/main/.claude/skills/claude-prompt-guide/SKILL.mdgit clone --depth 1 https://github.com/changoo89/claude-pilotWrote 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/changoo89/claude-pilot/claude-prompt-guide)<a href="https://agentmods.dev/skills/changoo89/claude-pilot/claude-prompt-guide"><img src="https://agentmods.dev/badge/skills/changoo89/claude-pilot/claude-prompt-guide/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/changoo89/claude-pilot/claude-prompt-guide"><img src="https://agentmods.dev/badge/skills/changoo89/claude-pilot/claude-prompt-guide.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 | $0.00040 | $0.01531 |
| Opus 5 | $0.00020 | $0.00766 |
| Sonnet 5 | $0.00008 | $0.00306 |
| Haiku 4.5 | $0.00004 | $0.00153 |
Grade A, and why
claude-prompt-guide 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 11d 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 — 200 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: Claude Prompt Guide
Purpose: Document Anthropic XML tag patterns and prompt engineering best practices Target: All agents creating or modifying system prompts, commands, and skills
Quick Start
When to Use This Skill
- Creating new system prompts or agent instructions
- Modifying existing command or skill behavior
- Debugging prompt-related issues
Quick Reference
<do_not_act_before_instructions>Defer action until conditions met</do_not_act_before_instructions>
<default_to_action>Prefer tool use over chat responses</default_to_action>
<use_parallel_tool_calls>Execute independent tools simultaneously</use_parallel_tool_calls>
<investigate_before_answering>Research before responding</investigate_before_answering>
<avoid_excessive_markdown_and_bullet_points>Prefer prose over lists</avoid_excessive_markdown_and_bullet_points>
What This Skill Covers
In Scope
- Anthropic official behavior control XML patterns
- System prompt internal tag structure
- 10-Component Framework for effective prompts
- Best practices (DO/DON'T)
Out of Scope
- Model-specific tuning → @.claude/skills/coding-standards/SKILL.md
- Agent role definitions → @.claude/agents/CONTEXT.md
Core Concepts
CRITICAL: Tag Names Are Customizable
XML tag names are NOT magic - the content/instructions matter, not the tag name.
Official Behavior Control Tags
<do_not_act_before_instructions> - Control When to Defer Action
Purpose: Prevent premature tool use or implementation When to Use: Read-only phases, planning stages
<do_not_act_before_instructions>
This is a READ-ONLY planning phase. Do not use Edit tool or modify any files.
Only proceed with implementation when the user explicitly runs `/01_confirm` → `/02_execute`.
</do_not_act_before_instructions>
<default_to_action> - Encourage Proactive Tool Use
Purpose: Prefer tool execution over chat-only responses
<default_to_action>
Prefer taking action through tool use rather than providing lengthy explanations.
</default_to_action>
What ships with it
2 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.
- 11d ago First seen · 200 lines · 40 tokens per session scan A 6b4236ad7fd6
claude-prompt-guide is a skill published in the GitHub repository changoo89/claude-pilot (20 stars, last pushed 7mo ago), licensed MIT. It adds 40 tokens to every session and 1,531 once invoked, about $0.0002 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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