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 alivirgo/Major-AI-Skills --skill ask-what-changed-onlygit clone --depth 1 https://github.com/alivirgo/Major-AI-SkillsWrote 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/alivirgo/major-ai-skills/ask-what-changed-only)<a href="https://agentmods.dev/skills/alivirgo/major-ai-skills/ask-what-changed-only"><img src="https://agentmods.dev/badge/skills/alivirgo/major-ai-skills/ask-what-changed-only/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/alivirgo/major-ai-skills/ask-what-changed-only"><img src="https://agentmods.dev/badge/skills/alivirgo/major-ai-skills/ask-what-changed-only.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 | $0.00022 | $0.01046 |
| Opus 5.5 | $0.00009 | $0.00418 |
| Sonnet 5.5 | $0.00004 | $0.00209 |
| Haiku 4.5 | $0.00002 | $0.00105 |
Grade A, and why
ask-what-changed-only 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.
How it starts
The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ask AI for Changes Only (The Delta/Diff Protocol) (AI Skill)
Overview
When asking an AI to tweak a sentence in a 1,500-word article or fix one function in a 400-line script, default model behavior is to regenerate the entire document from start to finish.
This creates two major problems:
- Severe Token Waste: Generates thousands of unnecessary output tokens ($$$ and slow generation time).
- Review Nightmare: You have to re-read the entire document just to find what tiny phrase or line actually changed.
The Delta / Diff Protocol instructs the model to output only the exact modified chunks, with clear before-and-after references or standard Git-style diffs.
Full Regeneration vs. Delta Output
┌─────────────────────────────────────────────────────────────┐
│ Full Rewrite vs. Delta Output │
│ │
│ Full Document Regeneration: │
│ • 1,200 tokens generated │
│ • 25 seconds wait time │
│ • User must manually hunt for changes │
│ │
│ Delta / Diff Output: │
│ • 85 tokens generated (93% token reduction) │
│ • 2 seconds generation time │
│ • Visual instant clarity on what changed │
└─────────────────────────────────────────────────────────────┘
Master Delta Prompt Templates
Pattern 1: The Unified Diff Directive (Code & Configs)
Use this for codebases, YAML, JSON, or configuration files:
Here is my code file: [PASTE CODE].
Task: [DESCRIBE THE REFACTOR / FIX].
Output Rules:
1. Do NOT reprint the entire file.
2. Provide ONLY a standard unified `diff` block showing `-` for removed lines and `+` for added lines.
3. Include 2 lines of unchanged context above and below each modification.
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 Changed · -15 tokens per session 9eda32dd690d
- 2mo ago First seen · 129 lines · 37 tokens per session scan A de88c08010f6
ask-what-changed-only is a skill published in the GitHub repository alivirgo/Major-AI-Skills (2 stars, last pushed yesterday), licensed MIT. It adds 22 tokens to every session and 1,046 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-05.
ask-what-changed-only compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| ask-what-changed-onlyalivirgo/Major-AI-Skills | Skill | 2 | yesterday | MIT | A | 22 | Claude Code |
| ax-extract-workflowsickn33/agentic-awesome-skills | Skill | 49k | yesterday | MIT | A | 35 | Claude Code |
| azure-reposMicrosoftDocs/Agent-Skills | Skill | 807 | 5d ago | CC-BY-4.0 | A | 117 | Claude Code |
| app-store-changelog-v2diegosouzapw/awesome-omni-skills | Skill | 170 | 4mo ago | MIT | A | 56 | Codex |
| app-store-changelogdiegosouzapw/awesome-omni-skills | Skill | 170 | 4mo ago | MIT | A | 54 | Codex |
| commit-conventionAtulPurohit/Antigravity-Awesome-Skills | Skill | 4 | 3mo ago | none | A | 23 | Claude Code, Codex |
| autofix-prQwenLM/qwen-code | Skill | 29k | yesterday | Apache-2.0 | A | 141 | Claude Code |