Borrowing it
Nothing to install: this file belongs to asteroid-belt/skulto. 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/asteroid-belt/skulto/main/AGENTS.mdgit clone --depth 1 https://github.com/asteroid-belt/skultoWrote 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/asteroid-belt/skulto/agents-md)<a href="https://agentmods.dev/instructions/asteroid-belt/skulto/agents-md"><img src="https://agentmods.dev/badge/instructions/asteroid-belt/skulto/agents-md.svg" alt="Measured on agentmods" 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 | $0.03435 | $0.03435 |
| Opus 5 | $0.01717 | $0.01717 |
| Sonnet 5 | $0.00687 | $0.00687 |
| Haiku 4.5 | $0.00344 | $0.00344 |
Grade B, and why
skulto AGENTS.md scanned grade B 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 7d 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.
Instruction-override phrasingmediumPrompt injection
Text telling the model to disregard its earlier instructions or safety rules is the shape of a prompt injection, whoever wrote it.
| Instruction Override | HIGH | "ignore previous instructions", "disregard rules" | Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
How it starts
The opening of the file, as written. The whole thing — 344 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skulto Agent Guide
Scope: Root project (applies to all subdirectories unless overridden)
Quick Facts
| Item | Value |
|---|---|
| Primary language | Go 1.25+ |
| Package manager | Go modules (go mod) |
| Build tool | Make (make build, make build-mcp, make build-all) |
| CLI framework | Cobra + Fang |
| TUI framework | Bubble Tea + Lip Gloss |
| MCP framework | mcp-go v0.27+ |
| Database | SQLite + GORM + FTS5 full-text search |
| Vector search | chromem-go (optional, for semantic search) |
| Analytics | PostHog (opt-out via SKULTO_TELEMETRY_TRACKING_ENABLED=false) |
| Primary binaries | skulto (CLI/TUI), skulto-mcp (MCP server) |
| CI/CD | GitHub Actions (.github/workflows/ci.yml) |
| Test command | make test (coverage report: coverage.html) |
| Lint command | make lint (golangci-lint v2.7.2) |
Repository Tour
skulto/
├── cmd/
│ ├── skulto/ # Main CLI/TUI entry point
│ └── skulto-mcp/ # MCP server binary (JSON-RPC 2.0 over stdio)
├── internal/
│ ├── cli/ # Cobra CLI commands (add, install, pull, scan, etc.)
│ │ └── prompts/ # Interactive CLI prompts (platform selector)
│ ├── config/ # Configuration (env vars only, no config file)
│ ├── db/ # GORM + SQLite + FTS5 database layer
│ ├── detect/ # AI tool detection on system (command/dir checks)
│ ├── discovery/ # Skill discovery and ingestion from local dirs
│ ├── embedding/ # OpenAI embedding provider abstraction
│ ├── favorites/ # File-based favorites persistence (~/.agents/skulto/favorites.json)
│ ├── installer/ # Skill installation via symlinks (33 platforms)
│ ├── llm/ # LLM provider abstraction (Anthropic, OpenAI, OpenRouter)
│ ├── log/ # Structured logging
│ ├── mcp/ # MCP server implementation (tools + resources)
│ ├── migration/ # Database migrations
│ ├── models/ # Data structures (Skill, Tag, Source, Security, etc.)
│ ├── scraper/ # GitHub scraping (git clone based, shallow clones)
│ ├── search/ # Hybrid search service (FTS5 + semantic)
│ ├── security/ # Security scanner (prompt injection detection)
│ ├── skillgen/ # Local skill scanning (~/.agents/skulto/skills, ./.skulto/skills)
│ ├── telemetry/ # PostHog analytics (opt-in events defined in events.go)
│ ├── testutil/ # Test utilities and helpers
│ ├── tui/ # Bubble Tea TUI application
│ │ ├── components/ # Reusable UI components (dialogs, selectors)
│ │ ├── design/ # Design constants and skull ASCII art
│ │ └── views/ # Screen views (home, search, detail, onboarding, manage)
│ └── vector/ # Vector store abstraction for semantic search
├── pkg/version/ # Version info (set via ldflags at build time)
├── scripts/ # Build and release scripts (ship-it.sh, release.sh)
├── docs/ # Project documentation (overview, architecture, ADRs, glossary)
├── context/ # Deep-dive technical documentation (see below)
├── plans/ # Implementation plans (agent-detection, mcp-plan)
├── assets/ # Demo GIFs for README
└── .github/workflows/ # CI/CD pipelines
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.
- 7d ago First seen · 344 lines · 3,435 tokens per session scan B d71d3af0f493
skulto AGENTS.md is an instructions file published in the GitHub repository asteroid-belt/skulto (50 stars, last pushed 14d ago), licensed MIT. It adds 3,435 tokens to every session, about $0.0172 per session on Opus 5. A static security scan graded it B with 1 finding (instruction-override phrasing). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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.
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 oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.