ml4t-stress-test SKILL.md skillA
ml4t-stress-test from ml4t/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ml4t/skills/ml4t-stress-test@git:20260901.c415df0Pins git:20260901.c415df0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ml4t/skills
- Path
portfolio/stress-test/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260901.c415df0, committed Sep 1, 2026
- First version recorded
- May 28, 2026
- Size
- 4,254 bytes
- Repository stars
- 41
- License
- Apache-2.0
Test portfolios against historical crises and hypothetical shocks. Use when quantifying tail risk before deployment or during risk reviews.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Stress Testing
A strategy backtested on 2015-2023 has never seen a regime where equities and bonds fall simultaneously. Without stress testing against 2008, 2020, and 2022, you are implicitly betting that those regimes will not recur.
## The Problem
Backtests cover only the historical sample, which may exclude the scenarios most relevant to survival. A momentum strategy backtested from 2010 onward has never experienced the 2009 momentum crash (-46% in one month). Stress testing applies known crisis scenarios and hypothetical shocks to the current portfolio, revealing exposures that summary statistics hide. This is not optional - it is how you discover that your "diversified" portfolio has a hidden correlation spike that produces a -30% month.
## The Pattern
### WRONG
```python
import numpy as np
# Only looks at backtest period (2016-2023) - misses major crises
returns = backtest_returns # 2016-2023 daily
max_loss = returns.min()
print(f"Worst day: {max_loss:.1%}") # -3.2%, looks safe
# But GFC 2008 would have been -15% in a single week for this portfolio
```
### CORRECT
```python
import numpy as np
# Define crisis scenarios as asset-class shocks
SCENARIOS = {
…Read the whole file at its exact version.
How to install
mdr add ml4t/skills/ml4t-stress-test@sha256:0968b4f57c208a55The line at the top of this page pins the label git:20260901.c415df0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_wddattzdwlmsojok)
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Versions
The registry has recorded 2 versions of this file, between May 28, 2026 and Sep 1, 2026, about one every 96 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260901.c415df0 latest | 2026-09-01 | c415df0 | 4,254 B | A | view · diff |
| git:20260528.303089e | 2026-05-28 | 303089e | 4,262 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4254 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ml4t/skills · 41 stars · license Apache-2.0 · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_wddattzdwlmsojok GET https://markdownregistry.com/api/v1/resolve?ref=ml4t/skills/ml4t-stress-test GET https://markdownregistry.com/api/v1/blob/0968b4f57c208a554f964e423e163f74c716624ec6c9d7c28d1ca45a31eb1b0e
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.