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Calculate risk-based position sizes for long stock trades. An agent skill from tradermonty/claude-trading-skills.
MITAuto-check passed
Install Position Sizer
$ npx skills add tradermonty/claude-trading-skills --skill position-sizer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install tradermonty/claude-trading-skills position-sizer --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/position-sizer .claude/skills/position-sizer && rm -rf skills-srcUse ~/.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/
Install the "position-sizer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/position-sizer into .claude/skills/position-sizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "position-sizer", 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 install https://github.com/tradermonty/claude-trading-skills/tree/main/skills/position-sizerType 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.
$ npx skills add tradermonty/claude-trading-skills --skill position-sizer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install tradermonty/claude-trading-skills position-sizer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/position-sizer .agents/skills/position-sizer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "position-sizer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/position-sizer into .agents/skills/position-sizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "position-sizer", 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.
$ npx skills add tradermonty/claude-trading-skills --skill position-sizer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install tradermonty/claude-trading-skills position-sizer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/position-sizer .cursor/skills/position-sizer && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "position-sizer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/position-sizer into .cursor/skills/position-sizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "position-sizer", 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 https://github.com/tradermonty/claude-trading-skills.git --path skills/position-sizer--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add tradermonty/claude-trading-skills --skill position-sizer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install tradermonty/claude-trading-skills position-sizer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/position-sizer .gemini/skills/position-sizer && rm -rf skills-srcUse ~/.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/
Install the "position-sizer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/position-sizer into .gemini/skills/position-sizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "position-sizer", 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.
$ gh skill install tradermonty/claude-trading-skills position-sizerInstalls 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).
$ npx skills add tradermonty/claude-trading-skills --skill position-sizer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/position-sizer .github/skills/position-sizer && rm -rf skills-srcUse ~/.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/
Install the "position-sizer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/position-sizer into .github/skills/position-sizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "position-sizer", 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.
$ npx skills add tradermonty/claude-trading-skills --skill position-sizer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install tradermonty/claude-trading-skills position-sizer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tradermonty/claude-trading-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/position-sizer .opencode/skills/position-sizer && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "position-sizer" agent skill from https://github.com/tradermonty/claude-trading-skills/tree/main/skills/position-sizer into .opencode/skills/position-sizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "position-sizer", 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
position-sizer- GitHub stars
- 3k
- Used in
- 3 other repos
- Token cost
- ~1.9k tokens
- SKILL.md length
- 694 words
- Files
- 6 (incl. scripts, references)
- Skills in repo
- 74
- Repo updated
- First seen
- Licence
- MIT
At a glance
Calculate risk-based position sizes for long stock trades. An agent skill from tradermonty/claude-trading-skills.
- Works in 6 steps: Gather Trade Parameters → Execute Position Sizer Script → Load Methodology Reference → …
- User asks about position sizing
- SKILL.md covers Overview, When to Use, Prerequisites and Workflow, plus 3 more sections
- Runs Python scripts from its folder; calls python3
What it does
Position Sizer is an agent skill from tradermonty/claude-trading-skills. Calculate risk-based position sizes for long stock trades. Use when user asks about position sizing, how many shares to buy, risk per trade, Kelly criterion, ATR-based sizing, fractional-share sizing, or portfolio risk allocation. Supports stop-loss distance calculation, volatility scaling, and sector concentration checks.
Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including scripts and reference files (for example `references/sizing_methodologies.md`, `scripts/position_sizer.py` and `scripts/tests/conftest.py`).
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
- User asks about position sizing
- How many shares to buy
- Kelly criterion
- ATR-based sizing
Example prompts
- “/position-sizer”
Requirements
- Python 3
Workflow steps
6 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit eab8d5c. 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 3 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 no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Position Sizer loads about 1.9k tokens when it runs, and up to ~5k if it reads all its reference files. Until then it costs about 85 tokens; SKILL.md has 694 words of instructions outside code blocks.
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 eab8d5c, republished under its MIT licence (© tradermonty). 694 words, ~1,870 tokens.
Download SKILL.mdSave it as
.claude/skills/position-sizer/SKILL.md (or your agent's skills folder). This skill also uses 5 other files; get the full folder from GitHub.- name
- position-sizer
- description
- Calculate risk-based position sizes for long stock trades. Use when user asks about position sizing, how many shares to buy, risk per trade, Kelly criterion, ATR-based sizing, fractional-share sizing, or portfolio risk allocation. Supports stop-loss distance calculation, volatility scaling, and sector concentration checks.
Position Sizer
Overview
Calculate the optimal number of shares to buy for a long stock trade based on risk management principles. Supports three sizing methods:
- Fixed Fractional: Risk a fixed percentage of account equity per trade (default: 1%)
- ATR-Based: Use Average True Range to set volatility-adjusted stop distances
- Kelly Criterion: Calculate mathematically optimal risk allocation from historical win/loss statistics
All methods apply portfolio constraints (max position %, max sector %) and output a final recommended share count with full risk breakdown. The default output is whole shares. Use --fractional only when the user's broker supports fractional shares for the security and order type.
When to Use
- User asks "how many shares should I buy?"
- User wants to calculate position size for a specific trade setup
- User mentions risk per trade, stop-loss sizing, or portfolio allocation
- User asks about Kelly Criterion or ATR-based position sizing
- User has a small account where whole-share rounding would under-deploy a defined risk budget
- User wants to check if a position fits within portfolio concentration limits
Prerequisites
- No API keys required
- Python 3.9+ with standard library only
Workflow
Step 1: Gather Trade Parameters
Collect from the user:
- Required: Account size (total equity)
- Mode A (Fixed Fractional): Entry price, stop price, risk percentage (default 1%)
- Mode B (ATR-Based): Entry price, ATR value, ATR multiplier (default 2.0x), risk percentage
- Mode C (Kelly Criterion): Win rate, average win, average loss; optionally entry and stop for share calculation
- Optional constraints: Max position % of account, max sector %, current sector exposure
- Optional share mode: Whole shares by default, or fractional shares with
--fractional --share-precision Nwhen supported by the broker
If the user provides a stock ticker but not specific prices, use available tools to look up the current price and suggest entry/stop levels based on technical analysis.
Step 2: Execute Position Sizer Script
Run the position sizing calculation:
# Fixed Fractional (most common)
python3 skills/position-sizer/scripts/position_sizer.py \
--account-size 100000 \
--entry 155 \
--stop 148.50 \
--risk-pct 1.0 \
--output-dir reports/
# Fractional shares for small accounts or high-priced stocks
python3 skills/position-sizer/scripts/position_sizer.py \
--account-size 1000 \
--entry 155 \
--stop 148.50 \
--risk-pct 1.0 \
--fractional \
--share-precision 4 \
--output-dir reports/
# ATR-Based
python3 skills/position-sizer/scripts/position_sizer.py \
--account-size 100000 \
--entry 155 \
--atr 3.20 \
--atr-multiplier 2.0 \
--risk-pct 1.0 \
--output-dir reports/
# Kelly Criterion (budget mode - no entry)
python3 skills/position-sizer/scripts/position_sizer.py \
--account-size 100000 \
--win-rate 0.55 \
--avg-win 2.5 \
--avg-loss 1.0 \
--output-dir reports/
# Kelly Criterion (shares mode - with entry/stop)
python3 skills/position-sizer/scripts/position_sizer.py \
--account-size 100000 \
--entry 155 \
--stop 148.50 \
--win-rate 0.55 \
--avg-win 2.5 \
--avg-loss 1.0 \
--output-dir reports/Step 3: Load Methodology Reference
Read references/sizing_methodologies.md to provide context on the chosen method, risk guidelines, and portfolio constraint best practices.
Step 4: Calculate Multiple Scenarios
If the user has not specified a single method, run multiple scenarios for comparison:
- Fixed Fractional at 0.5%, 1.0%, and 1.5% risk
- ATR-based at 1.5x, 2.0x, and 3.0x multipliers
- Present a comparison table showing shares, position value, and dollar risk for each
Step 5: Apply Portfolio Constraints and Determine Final Size
Add constraints if the user has portfolio context:
python3 skills/position-sizer/scripts/position_sizer.py \
--account-size 100000 \
--entry 155 \
--stop 148.50 \
--risk-pct 1.0 \
--max-position-pct 10 \
--max-sector-pct 30 \
--current-sector-exposure 22 \
--output-dir reports/Explain which constraint is binding and why it limits the position.
Show full SKILL.md (293 more words)Show less
Step 6: Generate Position Report
Present the final recommendation including:
- Method used and rationale
- Exact share count and position value
- Dollar risk and percentage of account
- Stop-loss price
- Any binding constraints
- Risk management reminders (portfolio heat, loss-cutting discipline)
- Small-account reminders: fractional shares do not remove broker minimums, spread/slippage, commissions/fees, margin limits, borrow availability, or day-trading controls
Output Format
JSON Report
{
"schema_version": "1.0",
"mode": "shares",
"parameters": {
"entry_price": 155.0,
"account_size": 100000,
"stop_price": 148.50,
"risk_pct": 1.0
},
"calculations": {
"fixed_fractional": {
"method": "fixed_fractional",
"shares": 153,
"risk_per_share": 6.50,
"dollar_risk": 1000.0,
"stop_price": 148.50
},
"atr_based": null,
"kelly": null
},
"constraints_applied": [],
"final_recommended_shares": 153,
"final_position_value": 23715.0,
"final_risk_dollars": 994.50,
"final_risk_pct": 0.99,
"binding_constraint": null
}Markdown Report
Generated automatically alongside the JSON report. Contains:
- Parameters summary
- Calculation details for the active method
- Constraints analysis (if any)
- Final recommendation with shares, value, and risk
Reports are saved to reports/ with filenames position_sizer_YYYY-MM-DD_HHMMSS.json and .md.
Resources
references/sizing_methodologies.md: Comprehensive guide to Fixed Fractional, ATR-based, and Kelly Criterion methods with examples, comparison table, and risk management principlesscripts/position_sizer.py: Main calculation script (CLI interface)
Key Principles
- Survival first: Position sizing is about surviving losing streaks, not maximizing winners
- The 1% rule: Default to 1% risk per trade; never exceed 2% without exceptional reason
- Default to whole shares: Existing workflows remain integer-share by default
- Floor, never round up: Whole-share mode floors to an integer; fractional mode floors to the requested precision so risk and concentration budgets are not exceeded
- Strictest constraint wins: When multiple limits apply, the tightest one determines final size
- Half Kelly: Never use full Kelly in practice; half Kelly captures 75% of growth with far less risk
- Portfolio heat: Total open risk should not exceed 6-8% of account equity
- Intraday rules are broker-specific: FINRA replaced the old pattern-day-trader day-count and $25,000 minimum-equity requirements with intraday margin standards effective 2026-06-04, with broker phase-in allowed through 2027-10-20. Check the broker's current rules before repeated same-day trading in a margin account.
- Asymmetry of losses: A 50% loss requires a 100% gain to recover; size accordingly
© tradermonty, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 5 other files (scripts, references) in skills/position-sizer of tradermonty/claude-trading-skills.
- SKILL.md
- references/sizing_methodologies.md
- requirements.txt
- scripts/position_sizer.py
- scripts/tests/conftest.py
- scripts/tests/test_position_sizer.py
Open the folder on GitHubat commit eab8d5c
Used in 3 other repositories
We found 4 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in tradermonty/claude-trading-skills, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Position Sizer 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Position Sizer this skilltradermonty/claude-trading-skills | 3k | 3 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Prediction Market Risk Reviewaffaan-m/ECC | 275k | 1 repos | ~471 | Automated safety check: Pass | MIT | |
| Trader Riskruvnet/ruflo | 74k | 1 repos | ~358 | Automated safety check: Notes | MIT | |
| Vibe-Trading Finance ToolkitHKUDS/Vibe-Trading | 35k | — | ~6.5k | Automated safety check: Pass | MIT | |
| Portfolio Risk Metricswshobson/agents | 40k | 13 repos | ~502 | Automated safety check: Pass | MIT | |
| Trade Riskzubair-trabzada/ai-trading-claude | 267 | — | ~4.8k | Automated safety check: Pass | MIT |
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Questions about Position Sizer
What does Position Sizer do?
Calculate risk-based position sizes for long stock trades. An agent skill from tradermonty/claude-trading-skills. Position Sizer is an agent skill from tradermonty/claude-trading-skills. Calculate risk-based position sizes for long stock trades.
When should I use Position Sizer?
Position Sizer fits situations like: user asks about position sizing; how many shares to buy; kelly criterion; ATR-based sizing.
How do I install Position Sizer in Claude Code?
Run `npx skills add tradermonty/claude-trading-skills --skill position-sizer -a claude-code`. Or copy the skill folder (skills/position-sizer in tradermonty/claude-trading-skills) into .claude/skills/position-sizer in your project. Claude Code loads it when a task matches its description.
How do I install Position Sizer in Codex?
Run `npx skills add tradermonty/claude-trading-skills --skill position-sizer -a codex`. Or copy the skill folder (skills/position-sizer in tradermonty/claude-trading-skills) into .agents/skills/position-sizer in your project. Codex loads it when a task matches its description.
Can I use Position Sizer 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 position-sizer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/position-sizer, .gemini/skills/position-sizer, .github/skills/position-sizer and .opencode/skills/position-sizer in your project.
What does Position Sizer need to run?
Going by SKILL.md and its folder, Position Sizer needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3.
Does Position Sizer 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 Position Sizer 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 Position Sizer use?
Position Sizer 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 Position Sizer use?
About 1.9k tokens (SKILL.md is roughly 7.5k 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 3.1k tokens, read only when the agent opens those files.
What are the alternatives to Position Sizer?
Skills that share tags, products or a category with Position Sizer: Prediction Market Risk Review (affaan-m/ECC, 275k stars), Trader Risk (ruvnet/ruflo, 74k stars), Vibe-Trading Finance Toolkit (HKUDS/Vibe-Trading, 35k stars) and Portfolio Risk Metrics (wshobson/agents, 40k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Position Sizer?
tradermonty (a GitHub user) maintains it in tradermonty/claude-trading-skills, which has 2,960 GitHub stars. The repository holds 74 skills in this directory. The repository was last updated on October 5, 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.