Borrowing it
Nothing to install: this file belongs to vinhnx/VTCode. 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/vinhnx/VTCode/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/vinhnx/VTCodeWrote 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/vinhnx/vtcode/copilot-instructions)<a href="https://agentmods.dev/instructions/vinhnx/vtcode/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/vinhnx/vtcode/copilot-instructions/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/vinhnx/vtcode/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/vinhnx/vtcode/copilot-instructions.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 | $0.02727 | $0.02727 |
| Opus 5.5 | $0.01091 | $0.01091 |
| Sonnet 5.5 | $0.00545 | $0.00545 |
| Haiku 4.5 | $0.00273 | $0.00273 |
Grade C, and why
VTCode copilot-instructions.md scanned grade C 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 26d 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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
- For operations that are potentially destructive (e.g., `git reset --hard`, `git push --force`, `rm -rf`), require How it starts
The opening of the file, as written. The whole thing — 273 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VT Code Agent Guidelines
VT Code: Rust terminal coding agent with modular architecture, multi-LLM support (OpenAI, Anthropic, Gemini), tree-sitter parsing for 6+ languages.
Build & Test Commands
# Preferred (faster with cargo-nextest)
cargo nextest run # Run all tests (3-5x faster)
cargo nextest run -p vtcode-core # Single package
cargo t # Alias for nextest run
cargo tq # Quick profile (no retries)
# Standard cargo commands
cargo check # Fast compile check
cargo clippy # Lint (strict Clippy rules)
cargo fmt # Format code
# Fallback (if nextest unavailable)
cargo ts # Alias for standard cargo test
Architecture & Key Modules
- Workspace:
crates/codegen/vtcode-core/(library) +src/main.rs(binary) + 9 workspace crates - Core:
llm/(multi-provider),tools/(trait-based),config/(TOML-based) - Integrations: Tree-sitter, PTY execution, ACP/MCP protocol, Gemini/OpenAI/Anthropic APIs
Code Style & Conventions
- Naming: snake_case functions/vars, PascalCase types (standard Rust)
- Error Handling:
anyhow::Result<T>+anyhow::Context; NOunwrap() - Constants: Use
crates/codegen/vtcode-core/src/config/constants.rs(never hardcode, especially model IDs) - Config: Read from
vtcode.tomlat runtime - Docs: Markdown ONLY in
./docs/; usedocs/models.jsonfor latest LLM models - Formatting: 4-space indentation, early returns, simple variable names
- Ownership first: Prefer owned values and borrows; reach for
Rc<T>/Arc<T>only when multiple owners genuinely need to keep data alive - Shared ownership:
Rc<T>is single-threaded;Arc<T>is for cross-thread/task sharing. Prefer immutable sharing beforeRefCell,Mutex, orRwLock - Cycles: Use
Weak<T>/Arc::downgrade()for back-references or task-parent links so shared graphs can drop cleanly
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.
- 26d ago Changed · +10 lines · +5 tokens per session ed5453b6e78b
- 2mo ago First seen · 263 lines · 2,722 tokens per session scan C 0df4969dd082
VTCode copilot-instructions.md is an instructions file published in the GitHub repository vinhnx/VTCode (894 stars, last pushed 3d ago), licensed Apache-2.0. It adds 2,727 tokens to every session, about $0.0109 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
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AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.