Borrowing it
Nothing to install: this file belongs to tommyvo/useful-prompts. 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/tommyvo/useful-prompts/master/AGENTS.mdgit clone --depth 1 https://github.com/tommyvo/useful-promptsWrote 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/tommyvo/useful-prompts/agents-md)<a href="https://agentmods.dev/instructions/tommyvo/useful-prompts/agents-md"><img src="https://agentmods.dev/badge/instructions/tommyvo/useful-prompts/agents-md/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/instructions/tommyvo/useful-prompts/agents-md"><img src="https://agentmods.dev/badge/instructions/tommyvo/useful-prompts/agents-md.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 | $0.01544 | $0.01544 |
| Opus 5.5 | $0.00618 | $0.00618 |
| Sonnet 5.5 | $0.00309 | $0.00309 |
| Haiku 4.5 | $0.00154 | $0.00154 |
Grade A, and why
useful-prompts AGENTS.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 2d 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 — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Guidelines for useful-prompts
Project Type
Reference library of AI prompts - Markdown files with YAML frontmatter. NO build/test/lint commands exist. Files deploy via shell scripts.
Build/Test Commands
N/A - This is a content repository, not a running application. No npm/bundle/test/lint commands.
Repository Structure
Every prompt/skill/command is maintained in four parallel copies, one per platform:
| Directory | Platform | Format |
|---|---|---|
Github Copilot/Prompt Files/ |
GitHub Copilot | kebab-case.prompt.md, frontmatter: description + agent: agent |
Github Copilot/Instructions/ |
GitHub Copilot (auto-apply) | kebab-case.instructions.md, frontmatter: description + applyTo |
Cursor/Skills/<name>/SKILL.md |
Cursor | frontmatter: name + description + disable-model-invocation: true |
Claude Code/Skills/<name>/SKILL.md |
Claude Code | same shape as Cursor — usually a byte-identical copy |
opencode/command/ |
Opencode (task automation) | frontmatter: description + agent: build (equivalent to Copilot's agent: agent) |
Note on GitHub Copilot frontmatter: the key is agent, not mode — every current prompt file uses agent: agent. If you see mode: agent referenced anywhere, it's stale; don't reproduce it in new files.
Code Style & Conventions
- File naming:
kebab-case.prompt.md/kebab-case.md/SKILL.mdunder akebab-case/folder - Frontmatter: REQUIRED on ALL .md files — see the table above for the exact keys per platform
- Quadruple-platform: ALWAYS maintain ALL FOUR versions (Copilot, Cursor, Claude Code, Opencode) for every prompt/skill
- Content sync: Body content should be identical across all four versions except for frontmatter and, where genuinely necessary, tool-specific instructions. The
gh-pr-*skills fetch PR data with theghCLI only on every platform (no GitHub MCP or VS Code GitHub PR extension tools, which don't work reliably); Copilot's versions additionally avoidgh pr diff, which crashes VS Code, and diff withgit diff origin/<base>...origin/<head>instead. The review and checklist skills' "How to launch them on this platform" paragraph (under "Large Reviews: Parallel Subagents") is also per-platform, because each tool launches subagents differently: Claude Code'sAgenttool, Cursor's subagents, Copilot'srunSubagenttool, and opencode's Task tool with thegeneralsubagent. Don't addtools:frontmatter to Copilot prompt files to enable subagents: it replaces the default tool list. The security checklists' "Independent Verification" step reuses that same launch paragraph, so it needs no per-platform text of its own - Shared bodies:
security-review-checklistandgh-pr-security-review-checklistshare one body from "Review Method" through "Suggested Scanners" (including "Wildcard Questions"), plus "Severity Guide" and "Sources"; keep those sections identical across both variants and all four platforms - Attribution: when a skill adapts ideas from an external project, credit it (with its license and copyright line) in the skill's
## Sourcessection and in the README's Acknowledgments, e.g. the security checklists credit Cloudflare's security-audit skill (MIT License). Paraphrase and adapt; don't copy text wholesale - Opencode arguments: add a
{$ARGUMENTS}slot in the Opencode version when the prompt naturally takes one argument (PR number/URL, file path) - Naming: the local code review skill is named
local-code-review(folder/file and slash command) across all four platforms, including Claude Code, to avoid colliding with Claude Code's own review tooling - Deprecation: Move deprecated files to
deprecated/subfolder (seeGithub Copilot/Prompt Files/deprecated/) - NEVER delete. Retired chat modes/agents (Beast Mode, Principal Engineer) live in the top-leveldeprecated/tree, which mirrors their original paths (deprecated/Github Copilot/Chat Modes/,deprecated/opencode/agent/). The install and import scripts no longer handle chat modes or agents, so nothing under it is installed - Git patterns: Most prompts start with
git diff HEADto analyze changes - Priority emojis: Code reviews use 🟣 CRITICAL, 🔴 HIGH, 🟡 MEDIUM, 🟢 LOW
- Documentation:
README.mdMUST be kept in sync with every change to this repo — not just new prompts. Any change to file structure, scripts (e.g.install-*.sh), directory layout, or available commands requires a matchingREADME.mdupdate in the same change. When creating/updating a prompt specifically, also update the rootREADME.mdtable,opencode/README.md, and this file for discoverability
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.
- 2d ago Changed · -2 lines · -57 tokens per session 8c454b806707
- 3d ago Changed · -15 tokens per session 560236a5aac1
- 25d ago Changed · +2 lines · +179 tokens per session 16885699c27a
- 1mo ago Changed · +135 tokens per session af700229f418
- 2mo ago First seen · 56 lines · 1,302 tokens per session scan A 8b71f794ab4a
useful-prompts AGENTS.md is an instructions file published in the GitHub repository tommyvo/useful-prompts (4 stars, last pushed 2d ago), licensed Unlicense. It adds 1,544 tokens to every session, about $0.0062 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 2026-08-31.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.