# backtesting-frameworks

> Claude/Codex skill by [@wshobson](https://omgskills.com/library/wshobson/index.md) · 38k stars · Updated 2026-07-22

Build robust backtesting systems for trading strategies with proper handling of look-ahead bias, survivorship bias, and transaction costs. Use when developing trading algorithms, validating strategies, or building backtesting infrastructure.

Tags: agent-skills, agentic-ai, agents, ai-agents, anthropic, automation, claude-code, claude-code-plugins, codex-cli, copilot, cursor, cursor-rules, developer-tools, gemini-cli, mcp, multi-agent, opencode, orchestration, prompt-engineering, workflows

## Install

```sh
git clone https://github.com/wshobson/agents /tmp/agents && ln -s /tmp/agents/plugins/quantitative-trading/skills/backtesting-frameworks ~/.claude/skills/backtesting-frameworks
```

## From README

Backtesting Frameworks Build robust, production-grade backtesting systems that avoid common pitfalls and produce reliable strategy performance estimates. When to Use This Skill Developing trading strategy backtests Building backtesting infrastructure Validating strategy performance Avoiding common backtesting biases Implementing walk-forward analysis Comparing strategy alternatives Core Concepts Backtesting Biases | Bias | Description | Mitigation | | ---------------- | ------------------------- | ----------------------- | | Look-ahead | Using future information | Point-in-time data | | Survivorship | Only testing on survivors | Use delisted securities | | Overfitting | Curve-fitting to history | Out-of-sample testing | | Selection | Cherry-picking strategies | Pre-registration | | Transaction | Ignoring trading costs | Realistic cost models | Proper Backtest Structure Walk-Forward Analysis Detailed worked examples and patterns Detailed sections (starting with \#\# Implementation...

## Links

- HTML page: https://omgskills.com/library/wshobson/agents/backtesting-frameworks/
- GitHub: https://github.com/wshobson/agents
- Author: [@wshobson](https://omgskills.com/library/wshobson/index.md)

## More from this repo

- [api-design-principles](https://omgskills.com/library/wshobson/agents/plugins/backend-development/skills/api-design-principles/index.md) — Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight...
   - [@wshobson](https://omgskills.com/library/wshobson/index.md) · 42k stars
- [angular-migration](https://omgskills.com/library/wshobson/agents/plugins/framework-migration/skills/angular-migration/index.md) — Migrate from AngularJS to Angular using hybrid mode, incremental component rewriting, and dependency injection updates.
   - [@wshobson](https://omgskills.com/library/wshobson/index.md) · 42k stars
- [architecture-decision-records](https://omgskills.com/library/wshobson/agents/architecture-decision-records/index.md) — Used to write and maintain Architecture Decision Records (ADRs) following best practices for technical decision...
   - [@wshobson](https://omgskills.com/library/wshobson/index.md) · 42k stars