Indexado en Registry
backtest-expert
Expert guidance for systematic backtesting of trading strategies. Use when developing, testing, stress-testing, or validating quantitative trading strategies. Covers "beating ideas to death" methodology, parameter robustness testing, slippage modeling, bias prevention, and interp
Resumen
Expert guidance for systematic backtesting of trading strategies. Use when developing, testing, stress-testing, or validating quantitative trading strategies. Covers "beating ideas to death" methodology, parameter robustness testing, slippage modeling, bias prevention, and interpreting backtest results. Applicable when user asks about backtesting, strategy validation, robustness testing, avoiding overfitting, or systematic trading development.
Leer documentación completa
Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.
Backtest Expert
Systematic approach to backtesting trading strategies based on professional methodology that prioritizes robustness over optimistic results.
Core Philosophy
Goal: Find strategies that "break the least", not strategies that "profit the most" on paper.
Principle: Add friction, stress test assumptions, and see what survives. If a strategy holds up under pessimistic conditions, it's more likely to work in live trading.
When to Use This Skill
Use this skill when:
- Developing or validating systematic trading strategies
- Evaluating whether a trading idea is robust enough for live implementation
- Troubleshooting why a backtest might be misleading
- Learning proper backtesting methodology
- Avoiding common pitfalls (curve-fitting, look-ahead bias, survivorship bias)
- Assessing parameter sensitivity and regime dependence
- Setting realistic expectations for slippage and execution costs
Prerequisites
- Python 3.9+ (for evaluation script)
- No API keys required
- No external data dependencies — metrics are user-provided
Workflow
1. State the Hypothesis
Define the edge in one sentence.
Example: "Stocks that gap up >3% on earnings and pull back to previous day's close within first hour provide mean-reversion opportunity."
If you can't articulate the edge clearly, don't proceed to testing.
2. Codify Rules with Zero Discretion
Define with complete specificity:
- Entry: Exact conditions, timing, price type
- Exit: Stop loss, profit target, time-based exit
- Position sizing: Fixed $$, % of portfolio, volatility-adjusted
- Filters: Market cap, volume, sector, volatility conditions
- Universe: What instruments are eligible
Critical: No subjective judgment allowed. Every decision must be rule-based and unambiguous.
3. Run Initial Backtest
Test over:
- Minimum 5 years (preferably 10+)
- Multiple market regimes (bull, bear, high/low volatility)
- Realistic costs: Commissions + conservative slippage
Examine initial results for basic viability. If fundamentally broken, iterate on hypothesis.
4. Stress Test the Strategy
This is where 80% of testing time should be spent.
Parameter sensitivity:
- Test stop loss at 50%, 75%, 100%, 125%, 150% of baseline
- Test profit target at 80%, 90%, 100%, 110%, 120% of baseline
- Vary entry/exit timing by ±15-30 minutes
- Look for "plateaus" of stable performance, not narrow spikes
Execution friction:
- Increase slippage to 1.5-2x typical estimates
- Model worst-case fills (buy at ask+1 tick, sell at bid-1 tick)
- Add realistic order rejection scenarios
- Test with pessimistic commission structures
Time robustness:
- Analyze year-by-year performance
- Require positive expectancy in majority of years
- Ensure strategy doesn't rely on 1-2 exceptional periods
- Test in different market regimes separately
Sample size:
- Absolute minimum: 30 trades
- Preferred: 100+ trades
- High confidence: 200+ trades
5. Out-of-Sample Validation
Walk-forward analysis:
- Optimize on training period (e.g., Year 1-3)
- Test on validation period (Year 4)
- Roll forward and repeat
- Compare in-sample vs out-of-sample performance
Warning signs:
- Out-of-sample <50% of in-sample performance
- Need frequent parameter re-optimization
- Parameters change dramatically between periods
6. Evaluate Results
Questions to answer:
- Does edge survive pessimistic assumptions?
- Is performance stable across parameter variations?
- Does strategy work in multiple market regimes?
- Is sample size sufficient for statistical confidence?
- Are results realistic, not "too good to be true"?
Decision criteria:
- ✅ Deploy: Survives all stress tests with acceptable performance
- 🔄 Refine: Core logic sound but needs parameter adjustment
- ❌ Abandon: Fails stress tests or relies on fragile assumptions
Use the evaluation script for a structured, quantitative assessment:
python3 skills/backtest-expert/scripts/evaluate_backtest.py \
--total-trades 150 \
--win-rate 62 \
--avg-win-pct 1.8 \
--avg-loss-pct 1.2 \
--max-drawdown-pct 15 \
--years-tested 8 \
--num-parameters 3 \
--slippage-tested \
--output-dir reports/
The script scores across 5 dimensions (Sample Size, Expectancy, Risk Management, Robustness, Execution Realism), detects red flags, and outputs a Deploy/Refine/Abandon verdict.
Key Testing Principles
Punish the Strategy
Add friction everywhere:
- Commissions higher than reality
- Slippage 1.5-2x typical
- Worst-case fills
- Order rejections
- Partial fills
Rationale: Strategies that survive pessimistic assumptions often outperform in live trading.
Seek Plateaus, Not Peaks
Look for parameter ranges where performance is stable, not optimal values that create performance spikes.
Good: Strategy profitable with stop loss anywhere from 1.5% to 3.0% Bad: Strategy only works with stop loss at exactly 2.13%
Stable performance indicates genuine edge; narrow optima suggest curve-fitting.
Test All Cases, Not Cherry-Picked Examples
Wrong approach: Study hand-picked "market leaders" that worked Right approach: Test every stock that met criteria, including those that failed
Selective examples create survivorship bias and overestimate strategy quality.
Separate Idea Generation from Validation
Intuition: Useful for generating hypotheses Validation: Must be purely data-driven
Never let attachment to an idea influence interpretation of test results.
Common Failure Patterns
Recognize these patterns early to save time:
- Parameter sensitivity: Only works with exact parameter values
- Regime-specific: Great in some years, terrible in others
- Slippage sensitivity: Unprofitable when realistic costs added
- Small sample: Too few trades for statistical confidence
- Look-ahead bias: "Too good to be true" results
- Over-optimization: Many parameters, poor out-of-sample results
See references/failed_tests.md for detailed examples and diagnostic framework.
Output
reports/backtest_eval_<timestamp>.json— structured evaluation with per-dimension scores, red flags, and verdictreports/backtest_eval_<timestamp>.md— human-readable report with dimension table, key metrics, and red flag details
Resources
Methodology Reference
File: references/methodology.md
When to read: For detailed guidance on specific testing techniques.
Contents:
- Stress testing methods
- Parameter sensitivity analysis
- Slippage and friction modeling
- Sample size requirements
- Market regime classification
- Common biases and pitfalls (survivorship, look-ahead, curve-fitting, etc.)
Failed Tests Reference
File: references/failed_tests.md
When to read: When strategy fails tests, or learning from past mistakes.
Contents:
- Why failures are valuable
- Common failure patterns with examples
- Case study documentation framework
- Red flags checklist for evaluating backtests
Critical Reminders
Time allocation: Spend 20% generating ideas, 80% trying to break them.
Context-free requirement: If strategy requires "perfect context" to work, it's not robust enough for systematic trading.
Red flag: If backtest results look too good (>90% win rate, minimal drawdowns, perfect timing), audit carefully for look-ahead bias or data issues.
Tool limitations: Understand your backtesting platform's quirks (interpolation methods, handling of low liquidity, data alignment issues).
Statistical significance: Small edges require large sample sizes to prove. 5% edge per trade needs 100+ trades to distinguish from luck.
Discretionary vs Systematic Differences
This skill focuses on systematic/quantitative backtesting where:
- All rules are codified in advance
- No discretion or "feel" in execution
- Testing happens on all historical examples, not cherry-picked cases
- Context (news, macro) is deliberately stripped out
Discretionary traders study differently—this skill may not apply to setups requiring subjective judgment.
Metadatos del archivo
name: backtest-expert description: Expert guidance for systematic backtesting of trading strategies. Use when developing, testing, stress-testing, or validating quantitative trading strategies. Covers "beating ideas to death" methodology, parameter robustness testing, slippage modeling, bias prevention, and interpreting backtest results. Applicable when user asks about backtesting, strategy validation, robustness testing, avoiding overfitting, or systematic trading development.
Ver texto original
--- name: backtest-expert description: Expert guidance for systematic backtesting of trading strategies. Use when developing, testing, stress-testing, or validating quantitative trading strategies. Covers "beating ideas to death" methodology, parameter robustness testing, slippage modeling, bias prevention, and interpreting backtest results. Applicable when user asks about backtesting, strategy validation, robustness testing, avoiding overfitting, or systematic trading development. --- # Backtest Expert Systematic approach to backtesting trading strategies based on professional methodology that prioritizes robustness over optimistic results. ## Core Philosophy **Goal**: Find strategies that "break the least", not strategies that "profit the most" on paper. **Principle**: Add friction, stress test assumptions, and see what survives. If a strategy holds up under pessimistic conditions, it's more likely to work in live trading. ## When to Use This Skill Use this skill when: - Developing or validating systematic trading strategies - Evaluating whether a trading idea is robust enough for live implementation - Troubleshooting why a backtest might be misleading - Learning proper backtesting methodology - Avoiding common pitfalls (curve-fitting, look-ahead bias, survivorship bias) - Assessing parameter sensitivity and regime dependence - Setting realistic expectations for slippage and execution costs ## Prerequisites - Python 3.9+ (for evaluation script) - No API keys required - No external data dependencies — metrics are user-provided ## Workflow ### 1. State the Hypothesis Define the edge in one sentence. **Example**: "Stocks that gap up >3% on earnings and pull back to previous day's close within first hour provide mean-reversion opportunity." If you can't articulate the edge clearly, don't proceed to testing. ### 2. Codify Rules with Zero Discretion Define with complete specificity: - **Entry**: Exact conditions, timing, price type - **Exit**: Stop loss, profit target, time-based exit - **Position sizing**: Fixed $$, % of portfolio, volatility-adjusted - **Filters**: Market cap, volume, sector, volatility conditions - **Universe**: What instruments are eligible **Critical**: No subjective judgment allowed. Every decision must be rule-based and unambiguous. ### 3. Run Initial Backtest Test over: - **Minimum 5 years** (preferably 10+) - **Multiple market regimes** (bull, bear, high/low volatility) - **Realistic costs**: Commissions + conservative slippage Examine initial results for basic viability. If fundamentally broken, iterate on hypothesis. ### 4. Stress Test the Strategy This is where 80% of testing time should be spent. **Parameter sensitivity**: - Test stop loss at 50%, 75%, 100%, 125%, 150% of baseline - Test profit target at 80%, 90%, 100%, 110%, 120% of baseline - Vary entry/exit timing by ±15-30 minutes - Look for "plateaus" of stable performance, not narrow spikes **Execution friction**: - Increase slippage to 1.5-2x typical estimates - Model worst-case fills (buy at ask+1 tick, sell at bid-1 tick) - Add realistic order rejection scenarios - Test with pessimistic commission structures **Time robustness**: - Analyze year-by-year performance - Require positive expectancy in majority of years - Ensure strategy doesn't rely on 1-2 exceptional periods - Test in different market regimes separately **Sample size**: - Absolute minimum: 30 trades - Preferred: 100+ trades - High confidence: 200+ trades ### 5. Out-of-Sample Validation **Walk-forward analysis**: 1. Optimize on training period (e.g., Year 1-3) 2. Test on validation period (Year 4) 3. Roll forward and repeat 4. Compare in-sample vs out-of-sample performance **Warning signs**: - Out-of-sample <50% of in-sample performance - Need frequent parameter re-optimization - Parameters change dramatically between periods ### 6. Evaluate Results **Questions to answer**: - Does edge survive pessimistic assumptions? - Is performance stable across parameter variations? - Does strategy work in multiple market regimes? - Is sample size sufficient for statistical confidence? - Are results realistic, not "too good to be true"? **Decision criteria**: - ✅ **Deploy**: Survives all stress tests with acceptable performance - 🔄 **Refine**: Core logic sound but needs parameter adjustment - ❌ **Abandon**: Fails stress tests or relies on fragile assumptions Use the evaluation script for a structured, quantitative assessment: ```bash python3 skills/backtest-expert/scripts/evaluate_backtest.py \ --total-trades 150 \ --win-rate 62 \ --avg-win-pct 1.8 \ --avg-loss-pct 1.2 \ --max-drawdown-pct 15 \ --years-tested 8 \ --num-parameters 3 \ --slippage-tested \ --output-dir reports/ ``` The script scores across 5 dimensions (Sample Size, Expectancy, Risk Management, Robustness, Execution Realism), detects red flags, and outputs a Deploy/Refine/Abandon verdict. ## Key Testing Principles ### Punish the Strategy Add friction everywhere: - Commissions higher than reality - Slippage 1.5-2x typical - Worst-case fills - Order rejections - Partial fills **Rationale**: Strategies that survive pessimistic assumptions often outperform in live trading. ### Seek Plateaus, Not Peaks Look for parameter ranges where performance is stable, not optimal values that create performance spikes. **Good**: Strategy profitable with stop loss anywhere from 1.5% to 3.0% **Bad**: Strategy only works with stop loss at exactly 2.13% Stable performance indicates genuine edge; narrow optima suggest curve-fitting. ### Test All Cases, Not Cherry-Picked Examples **Wrong approach**: Study hand-picked "market leaders" that worked **Right approach**: Test every stock that met criteria, including those that failed Selective examples create survivorship bias and overestimate strategy quality. ### Separate Idea Generation from Validation **Intuition**: Useful for generating hypotheses **Validation**: Must be purely data-driven Never let attachment to an idea influence interpretation of test results. ## Common Failure Patterns Recognize these patterns early to save time: 1. **Parameter sensitivity**: Only works with exact parameter values 2. **Regime-specific**: Great in some years, terrible in others 3. **Slippage sensitivity**: Unprofitable when realistic costs added 4. **Small sample**: Too few trades for statistical confidence 5. **Look-ahead bias**: "Too good to be true" results 6. **Over-optimization**: Many parameters, poor out-of-sample results See `references/failed_tests.md` for detailed examples and diagnostic framework. ## Output - `reports/backtest_eval_<timestamp>.json` — structured evaluation with per-dimension scores, red flags, and verdict - `reports/backtest_eval_<timestamp>.md` — human-readable report with dimension table, key metrics, and red flag details ## Resources ### Methodology Reference **File**: `references/methodology.md` **When to read**: For detailed guidance on specific testing techniques. **Contents**: - Stress testing methods - Parameter sensitivity analysis - Slippage and friction modeling - Sample size requirements - Market regime classification - Common biases and pitfalls (survivorship, look-ahead, curve-fitting, etc.) ### Failed Tests Reference **File**: `references/failed_tests.md` **When to read**: When strategy fails tests, or learning from past mistakes. **Contents**: - Why failures are valuable - Common failure patterns with examples - Case study documentation framework - Red flags checklist for evaluating backtests ## Critical Reminders **Time allocation**: Spend 20% generating ideas, 80% trying to break them. **Context-free requirement**: If strategy requires "perfect context" to work, it's not robust enough for systematic trading. **Red flag**: If backtest results look too good (>90% win rate, minimal drawdowns, perfect timing), audit carefully for look-ahead bias or data issues. **Tool limitations**: Understand your backtesting platform's quirks (interpolation methods, handling of low liquidity, data alignment issues). **Statistical significance**: Small edges require large sample sizes to prove. 5% edge per trade needs 100+ trades to distinguish from luck. ## Discretionary vs Systematic Differences This skill focuses on **systematic/quantitative** backtesting where: - All rules are codified in advance - No discretion or "feel" in execution - Testing happens on all historical examples, not cherry-picked cases - Context (news, macro) is deliberately stripped out Discretionary traders study differently—this skill may not apply to setups requiring subjective judgment.
Revisar el código fuente
Precio y costes de ejecución
- Obtener el skill
- Precio sin confirmar
- Ejecutarlo
- Requisitos sin confirmar. Consulta los costes del agente, API y servicios en la fuente.
- Licencia
- MIT
- Precio sin confirmar
- No hemos confirmado el precio. Los enlaces existentes al código y a la instalación siguen disponibles.
Obtener gratis no significa ejecutar gratis. El precio no es una evaluación de seguridad. Enviar información de precio →
Fuente del skill registrada
La ruta de instrucciones está registrada. No implica pruebas de ejecución, seguridad ni compatibilidad.
Revisar antes de instalar: Evitar instalación automática
Licencia: MIT
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- Financial research output is not financial advice; require human review before any live investment decision.
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
- Quality score needs review
- Permission surface needs review: shell or command execution, filesystem or document access
- Permission surface: shell or command execution, filesystem or document access
Las herramientas son indicios de metadatos, no compatibilidad probada. Los prompts son sugerencias.
Empieza con una tarea pequeña
- 1Lee la fuente y confirma entradas, resultados, dependencias y permisos.
- 2Pide un plan al agente. Aprueba la configuración y los costes antes de probar en un entorno aislado.
- 3Comprueba resultados y archivos modificados. Informa solo de lo ejecutado y conserva la revisión de la fuente.
Consulta dependencias, claves API y costes externos en la fuente. Un repositorio público no implica servicios gratuitos.
Fuente y notas de uso
Los metadatos y revisiones son orientativos. Popularidad, descubrimiento y ejecución correcta son hechos distintos.
- Repositorio fuente
- BaggaT236/AI-Trading-Skills
- Licencia
- MIT
- Versión
- 1.0.0
- Último push de GitHub
- 14 sept 2026
- Registro actualizado
- 4 oct 2026
- Ruta de instrucciones
- skills/backtest-expert/SKILL.md @ 8d77f8949c76
Versión declarada en el registro; consulta las versiones de la fuente.
Calidad
68/100
Prometedor
Confianza
69/100
Solo sandbox
Auditoría
80/100
Riesgoso
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- Financial research output is not financial advice; require human review before any live investment decision.
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
- Quality score needs review
- Permission surface needs review: shell or command execution, filesystem or document access
- Permission surface: shell or command execution, filesystem or document access
- Verified installs
- —
- Resultados
- —
Copiar no es instalar. Los recuentos requieren un informe de instalación correcta, no garantizan calidad general.
Acceso para agentes
La API Registry expone señales de decisión, confianza, auditoría, casos de uso e instalación sin raspar la interfaz.
Más detalles
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"metrics": {
"totalOutcomes": 0,
"successfulOutcomes": 0,
"failedOutcomes": 0,
"installAttempts": 0,
"installSuccessRate": null,
"successRate": null,
"recentSuccessRate": null,
"recentFailureRate": null,
"riskBlocked": 0,
"setupRequired": 0,
"notRelevant": 0,
"avgOutputQuality": null,
"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 80,
"risk_level": "risky",
"risk_label": "Risky",
"warnings": [
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
"Financial research output is not financial advice; require human review before any live investment decision.",
"This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
"Quality score needs review",
"Permission surface needs review: shell or command execution, filesystem or document access",
"Permission surface: shell or command execution, filesystem or document access"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 68,
"label": "Promising"
},
"supply": {
"track": "Coding and developer agents",
"scenario": "Coding agents",
"maintenance": "27d since push",
"risk": "Risky"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"high-compliance environments without internal security review",
"No major risk signals from current metadata",
"Audit risk risky exceeds max_risk=medium",
"High-risk permission hints: Shell or command execution",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required"
],
"agent_contract": {
"task_input": "Use backtest-expert in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 77/100 Strong shortlist",
"Audit: 80/100 Risky",
"Safety: 52/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "baggat236-backtest-expert (backtest-expert)",
"install_command": "npx skills add BaggaT236/AI-Trading-Skills --skill backtest-expert",
"risk_summary": "Risky; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "baggat236-backtest-expert",
"task": "Use backtest-expert in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/baggat236-backtest-expert",
"api": "https://www.openagentskill.com/api/agent/skills/baggat236-backtest-expert",
"audit": "https://www.openagentskill.com/skills/baggat236-backtest-expert/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=baggat236-backtest-expert&task=Use%20backtest-expert%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20backtest-expert%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20backtest-expert%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/baggat236-backtest-expert/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/baggat236-backtest-expert"
}
}Para el creador
Fuente de la ficha
Indexado por Registry
Esta ficha se indexó desde fuentes públicas y no está marcada como oficial hasta que se apruebe una reclamación de mantenedor.
- Creador
- BaggaT236
- Indexado por
- Índice comunitario de OpenAgentSkill
La atribución enlaza al repositorio público o al perfil del creador. Los creadores pueden reclamar la ficha para actualizar las señales de propiedad.
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