Agent skill

Downtrend Duration Analyzer

by tradermonty in tradermonty/claude-trading-skills

Analyze historical downtrend durations and generate interactive HTML histograms showing typical correction lengths by sector and market cap.

MITAuto-check passedFrontend & Design

Install Downtrend Duration Analyzer

skills CLI

$ npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install tradermonty/claude-trading-skills downtrend-duration-analyzer --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/downtrend-duration-analyzer .claude/skills/downtrend-duration-analyzer && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "downtrend-duration-analyzer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/downtrend-duration-analyzer into .claude/skills/downtrend-duration-analyzer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "downtrend-duration-analyzer", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/tradermonty/claude-trading-skills/tree/main/skills/downtrend-duration-analyzer

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install tradermonty/claude-trading-skills downtrend-duration-analyzer --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/downtrend-duration-analyzer .agents/skills/downtrend-duration-analyzer && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "downtrend-duration-analyzer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/downtrend-duration-analyzer into .agents/skills/downtrend-duration-analyzer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "downtrend-duration-analyzer", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install tradermonty/claude-trading-skills downtrend-duration-analyzer --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/downtrend-duration-analyzer .cursor/skills/downtrend-duration-analyzer && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "downtrend-duration-analyzer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/downtrend-duration-analyzer into .cursor/skills/downtrend-duration-analyzer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "downtrend-duration-analyzer", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/tradermonty/claude-trading-skills.git --path skills/downtrend-duration-analyzer

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install tradermonty/claude-trading-skills downtrend-duration-analyzer --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/downtrend-duration-analyzer .gemini/skills/downtrend-duration-analyzer && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "downtrend-duration-analyzer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/downtrend-duration-analyzer into .gemini/skills/downtrend-duration-analyzer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "downtrend-duration-analyzer", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install tradermonty/claude-trading-skills downtrend-duration-analyzer

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/downtrend-duration-analyzer .github/skills/downtrend-duration-analyzer && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "downtrend-duration-analyzer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/downtrend-duration-analyzer into .github/skills/downtrend-duration-analyzer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "downtrend-duration-analyzer", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install tradermonty/claude-trading-skills downtrend-duration-analyzer --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/downtrend-duration-analyzer .opencode/skills/downtrend-duration-analyzer && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "downtrend-duration-analyzer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/downtrend-duration-analyzer into .opencode/skills/downtrend-duration-analyzer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "downtrend-duration-analyzer", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: downtrend-duration-analyzer
GitHub stars: 3k
Used in: 1 other repo
Token cost: ~1.4k tokens
SKILL.md length: 377 words
Files: 9 (incl. scripts, references)
Skills in repo: 74
Repo updated: Oct 11, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Analyze historical downtrend durations and generate interactive HTML histograms showing typical correction lengths by sector and market cap.

Works in 4 steps: Fetch Historical Price Data → Analyze Downtrend Durations → Generate Interactive HTML Visualization → …
Tasks that involve HTML artifacts
SKILL.md covers Overview, When to Use, Prerequisites and Workflow, plus 3 more sections
Runs Python scripts from its folder; calls python3; needs FMP_API_KEY

What it does

Downtrend Duration Analyzer is an agent skill from tradermonty/claude-trading-skills. Analyze historical downtrend durations and generate interactive HTML histograms showing typical correction lengths by sector and market cap.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including scripts and reference files (for example `references/downtrend_methodology.md`, `scripts/analyze_downtrends.py` and `scripts/generate_histogram_html.py`).

It sits in Frontend & Design, covering HTML artifacts. The repository describes itself as: Claude Code skills for equity investors and traders — market analysis, technical charting, economic calendars, screeners, and trading strategy development. The licence is MIT.

When your agent uses it

Tasks that involve HTML artifacts

Example prompts

“/downtrend-duration-analyzer”

Requirements

Python 3
A credential in FMP_API_KEY

Workflow steps

4 steps, taken from the step headings in SKILL.md.

Fetch Historical Price Data
Analyze Downtrend Durations
Generate Interactive HTML Visualization
Review Distribution Insights

What it can do on your machine

Read from SKILL.md and the folder at commit c8d58f0. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 6 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
- python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
- FMP_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Downtrend Duration Analyzer loads about 1.4k tokens when it runs, and up to ~2.9k if it reads all its reference files. Until then it costs about 42 tokens; SKILL.md has 377 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~42
When it runs · the whole SKILL.md, loaded when a task matches: ~1.4k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~2.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from tradermonty/claude-trading-skills at commit c8d58f0, republished under its MIT licence (© tradermonty). 377 words, ~1,383 tokens.

Download SKILL.mdSave it as .claude/skills/downtrend-duration-analyzer/SKILL.md (or your agent's skills folder). This skill also uses 8 other files; get the full folder from GitHub.

name: downtrend-duration-analyzer
description: Analyze historical downtrend durations and generate interactive HTML histograms showing typical correction lengths by sector and market cap.

Downtrend Duration Analyzer

Overview

Analyze historical price data to identify downtrend periods (peak-to-trough) and build statistical distributions of correction durations. Generate interactive HTML visualizations with histograms segmented by sector and market cap to help traders understand typical recovery timeframes and set realistic expectations for mean reversion strategies.

When to Use

Trader asks about typical correction lengths for a sector or market cap tier
User wants to understand historical drawdown recovery times
Building mean reversion or pullback strategies that need realistic holding period estimates
Comparing correction behavior across different market segments
Setting stop-loss timeouts or position holding period limits

Prerequisites

Python 3.9+
FMP API key (set FMP_API_KEY environment variable or use --api-key)
Required packages: requests, pandas, numpy (standard data analysis stack)

Workflow

Step 1: Fetch Historical Price Data

Run the analysis script to fetch OHLC data for a universe of stocks and identify downtrend periods.

bash

python3 skills/downtrend-duration-analyzer/scripts/analyze_downtrends.py \
  --sector "Technology" \
  --lookback-years 5 \
  --output-dir reports/

Step 2: Analyze Downtrend Durations

The script automatically:

Identifies local peaks and troughs using rolling window analysis
Calculates duration (trading days) and depth (% decline) for each downtrend
Segments results by sector and market cap tier (Mega, Large, Mid, Small)
Computes summary statistics (median, mean, percentiles)

Step 3: Generate Interactive HTML Visualization

bash

python3 skills/downtrend-duration-analyzer/scripts/generate_histogram_html.py \
  --input reports/downtrend_analysis_*.json \
  --output-dir reports/

This creates an interactive HTML file with:

Histogram of downtrend durations
Filters for sector and market cap
Hover tooltips with percentile information
Summary statistics table

Show full SKILL.md (153 more words)Show less

Step 4: Review Distribution Insights

Load the generated markdown report to interpret the findings:

Short corrections (5-15 days): Typical pullbacks within uptrends
Medium corrections (15-40 days): Standard sector rotations
Extended corrections (40+ days): Trend changes or bear markets

Output Format

JSON Report

json

{
  "schema_version": "1.0",
  "analysis_date": "2026-03-28T07:00:00Z",
  "parameters": {
    "lookback_years": 5,
    "sector_filter": "Technology",
    "peak_window": 20,
    "trough_window": 20
  },
  "summary": {
    "total_downtrends": 1234,
    "median_duration_days": 18,
    "mean_duration_days": 24.5,
    "p25_duration_days": 10,
    "p75_duration_days": 32,
    "p90_duration_days": 55
  },
  "by_sector": {
    "Technology": {
      "count": 456,
      "median_days": 15,
      "mean_days": 20.3
    }
  },
  "by_market_cap": {
    "Mega": {"count": 200, "median_days": 12},
    "Large": {"count": 300, "median_days": 16},
    "Mid": {"count": 400, "median_days": 22},
    "Small": {"count": 334, "median_days": 28}
  },
  "downtrends": [
    {
      "symbol": "AAPL",
      "sector": "Technology",
      "market_cap_tier": "Mega",
      "peak_date": "2025-01-15",
      "trough_date": "2025-02-10",
      "duration_days": 18,
      "depth_pct": -12.5
    }
  ]
}

Markdown Report

markdown

# Downtrend Duration Analysis

**Date**: 2026-03-28
**Lookback**: 5 years
**Sector**: Technology

## Summary Statistics

| Metric | Value |
|--------|-------|
| Total Downtrends | 1,234 |
| Median Duration | 18 days |
| Mean Duration | 24.5 days |
| 25th Percentile | 10 days |
| 75th Percentile | 32 days |
| 90th Percentile | 55 days |

## By Market Cap Tier

| Tier | Count | Median | Mean |
|------|-------|--------|------|
| Mega ($200B+) | 200 | 12 days | 15.2 days |
| Large ($10-200B) | 300 | 16 days | 20.1 days |
| Mid ($2-10B) | 400 | 22 days | 28.4 days |
| Small (<$2B) | 334 | 28 days | 35.6 days |

## Key Insights

1. Larger companies recover faster from corrections
2. Technology sector shows shorter median correction than market average
3. 90% of corrections resolve within 55 trading days

HTML Visualization

Interactive histogram saved to reports/downtrend_histogram_YYYY-MM-DD.html with:

Plotly.js-based interactive charts
Sector and market cap dropdown filters
Duration distribution with bin controls
Percentile markers (P25, P50, P75, P90)

Reports are saved to reports/ with filenames:

downtrend_analysis_YYYY-MM-DD_HHMMSS.json
downtrend_analysis_YYYY-MM-DD_HHMMSS.md
downtrend_histogram_YYYY-MM-DD_HHMMSS.html

Resources

scripts/analyze_downtrends.py -- Main analysis script for fetching data and computing downtrend durations
scripts/generate_histogram_html.py -- HTML visualization generator with interactive histograms
references/downtrend_methodology.md -- Peak/trough detection algorithms and market cap tier definitions

Key Principles

Statistical Rigor: Use robust peak/trough detection to avoid noise-induced false signals
Segmentation Matters: Always analyze by sector and market cap; averages hide important differences
Realistic Expectations: Use percentiles (not just means) to understand the full distribution of outcomes

Files

SKILL.md and 8 other files (scripts, references) in skills/downtrend-duration-analyzer of tradermonty/claude-trading-skills.

SKILL.md
references/downtrend_methodology.md
requirements.txt
scripts/analyze_downtrends.py
scripts/generate_histogram_html.py
scripts/tests/conftest.py
scripts/tests/test_analyze_downtrends.py
scripts/tests/test_fetch_stock_list.py
scripts/tests/test_generate_histogram_html.py

Open the folder on GitHubat commit c8d58f0

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in tradermonty/claude-trading-skills, which our catalogue first saw on October 7, 2026.

BaggaT236/AI-Trading-Skillsskills/downtrend-duration-analyzer

Compare with similar skills

Downtrend Duration Analyzer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Downtrend Duration Analyzer compared with similar skills
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Report With HTMLdaymade/claude-code-skills	1.4k	—	~11k	Automated safety check: Pass	MIT	yesterday
LobeHub Interactive Prototypelobehub/lobehub	83k	—	~1.6k	Automated safety check: Pass	Custom licence	today
Paperclip Pagepaperclipai/paperclip	100k	—	~1k	Automated safety check: Pass	MIT	today
Openkb Deck NeonVectifyAI/OpenKB	4.8k	1 repos	~4.3k	Automated safety check: Pass	Apache-2.0	2 mo ago

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Questions about Downtrend Duration Analyzer

What does Downtrend Duration Analyzer do?

Analyze historical downtrend durations and generate interactive HTML histograms showing typical correction lengths by sector and market cap. Downtrend Duration Analyzer is an agent skill from tradermonty/claude-trading-skills. Analyze historical downtrend durations and generate interactive HTML histograms showing typical correction lengths by sector and market cap.

When should I use Downtrend Duration Analyzer?

Downtrend Duration Analyzer fits situations like: tasks that involve HTML artifacts.

How do I install Downtrend Duration Analyzer in Claude Code?

Run `npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a claude-code`. Or copy the skill folder (skills/downtrend-duration-analyzer in tradermonty/claude-trading-skills) into .claude/skills/downtrend-duration-analyzer in your project. Claude Code loads it when a task matches its description.

How do I install Downtrend Duration Analyzer in Codex?

Run `npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a codex`. Or copy the skill folder (skills/downtrend-duration-analyzer in tradermonty/claude-trading-skills) into .agents/skills/downtrend-duration-analyzer in your project. Codex loads it when a task matches its description.

Can I use Downtrend Duration Analyzer in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add tradermonty/claude-trading-skills --skill downtrend-duration-analyzer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/downtrend-duration-analyzer, .gemini/skills/downtrend-duration-analyzer, .github/skills/downtrend-duration-analyzer and .opencode/skills/downtrend-duration-analyzer in your project.

What does Downtrend Duration Analyzer need to run?

Going by SKILL.md and its folder, Downtrend Duration Analyzer needs Python for the scripts in its folder, the command-line tools its instructions call (python3) and credentials named FMP_API_KEY. Our summary lists: Python 3; A credential in FMP_API_KEY.

Does Downtrend Duration Analyzer access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Downtrend Duration Analyzer safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Downtrend Duration Analyzer use?

Downtrend Duration Analyzer is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Downtrend Duration Analyzer use?

About 1.4k tokens (SKILL.md is roughly 5.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.5k tokens, read only when the agent opens those files.

What are the alternatives to Downtrend Duration Analyzer?

Skills that share tags, products or a category with Downtrend Duration Analyzer: Visualize (code-yeongyu/oh-my-openagent, 70k stars), Report With HTML (daymade/claude-code-skills, 1.4k stars), LobeHub Interactive Prototype (lobehub/lobehub, 83k stars) and Paperclip Page (paperclipai/paperclip, 100k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Downtrend Duration Analyzer?

tradermonty (a GitHub user) maintains it in tradermonty/claude-trading-skills, which has 2,982 GitHub stars. The repository holds 74 skills in this directory. The repository was last updated on October 11, 2026.

Source: tradermonty/claude-trading-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Downtrend Duration Analyzer

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SKILL.md

Downtrend Duration Analyzer

Overview

When to Use

Prerequisites

Workflow

Step 1: Fetch Historical Price Data

Step 2: Analyze Downtrend Durations

Step 3: Generate Interactive HTML Visualization

Step 4: Review Distribution Insights

Output Format

JSON Report

Markdown Report

HTML Visualization

Resources

Key Principles

Files

Used in 1 other repository

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