Borrowing it
Nothing to install: this file belongs to vanessamarely/ai-playbook-reposito. 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/vanessamarely/ai-playbook-reposito/main/ai-playbook/.github/instructions/backend.instructions.mdgit clone --depth 1 https://github.com/vanessamarely/ai-playbook-repositoWrote 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/vanessamarely/ai-playbook-reposito/backend)<a href="https://agentmods.dev/instructions/vanessamarely/ai-playbook-reposito/backend"><img src="https://agentmods.dev/badge/instructions/vanessamarely/ai-playbook-reposito/backend/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/vanessamarely/ai-playbook-reposito/backend"><img src="https://agentmods.dev/badge/instructions/vanessamarely/ai-playbook-reposito/backend.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 | $0.00635 | $0.00635 |
| Opus 5 | $0.00318 | $0.00318 |
| Sonnet 5 | $0.00127 | $0.00127 |
| Haiku 4.5 | $0.00064 | $0.00064 |
Grade A, and why
ai-playbook-reposito backend.instructions.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 9d 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 — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Backend Instructions
Backend services may use different ecosystems — follow the conventions of each project's chosen language and framework. Do not apply frontend-specific rules (React patterns, accessibility guidelines) to backend code.
Node.js / TypeScript
Detect: package.json present; TypeScript if tsconfig.json present. Common frameworks: Express, Nest.js, Fastify.
Conventions:
- Use ES modules (
import/export) when"type": "module"inpackage.json, otherwise CommonJS. - Follow existing import ordering. Use async/await for async operations.
- Validate incoming data with Zod, Joi, or class-validator.
- Use structured logging (Winston/Pino) — avoid
console.login production code. - Handle errors with centralized middleware (Express) or exception filters (Nest.js).
Nest.js specifics: decorators for controllers/services/modules; constructor-based dependency injection; DTO classes with validation decorators; exception filters for HTTP errors; guards for auth.
See .github/prompts/node-typescript-service.prompt.md for handler patterns, validation schemas, and error-response shapes.
Java
Detect: pom.xml (Maven) or build.gradle/build.gradle.kts (Gradle). Common frameworks: Spring Boot, Quarkus, Micronaut.
Conventions: package structure com.organization.service.module; annotation-based configuration (@Service, @RestController, etc.); constructor-based DI preferred; builder patterns for complex objects; Bean Validation (@Valid, @NotNull); @ControllerAdvice for exceptions; PascalCase classes / camelCase methods; respect the project's Maven/Gradle module structure.
Python
Detect: pyproject.toml, setup.py, or requirements.txt. Common frameworks: FastAPI, Django, Flask.
Conventions: PEP 8 style; PEP 484 type hints on function signatures; respect .venv//venv/; async/await with FastAPI/aiohttp; validate with Pydantic (FastAPI) or framework validators; structured logging (not print); specific exception types, never bare except; test with pytest.
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.
- 9d ago First seen · 49 lines · 635 tokens per session scan A 0130a31ce436
ai-playbook-reposito backend.instructions.md is an instructions file published in the GitHub repository vanessamarely/ai-playbook-reposito (2 stars, last pushed 1mo ago), licensed MIT. It adds 635 tokens to every session, about $0.0032 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 2026-08-31.
Other instructions, from other repositories
vibe-coding-prompt-template backend.instructions.md
Instructions for KhazP/vibe-coding-prompt-template: Read AGENTS.md, agentdocs/techstack.md, and agentdocs/codepatterns.md.
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.
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).
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).
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.