position-sizer

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.

Quality

86%

Does it follow best practices?

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Securityby

Passed

No findings from the security scan

Quality

Content

72%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A well-structured, highly actionable skill body with executable CLI examples and one-level-deep references. The main weaknesses are inline time-sensitive regulatory dates that hurt conciseness and a workflow that lacks explicit validation checkpoints.

Suggestions

Move the FINRA intraday-margin date details (2026-06-04, phase-in through 2027-10-20) out of 'Key Principles' into a dedicated 'Regulatory notes' or deprecated/old-patterns section so time-sensitive facts don't bloat the main flow.

Add an explicit validation checkpoint to the workflow (e.g., Step 6: verify the generated JSON's final_recommended_shares against the binding constraint before presenting the recommendation to the user).

Trim Key Principles entries that restate well-known concepts (e.g., the 50%-loss/100%-gain asymmetry) to keep the body lean.

Dimension	Reasoning	Score
Conciseness	Mostly efficient with organized sections, but time-sensitive FINRA dates (2026-06-04, phase-in through 2027-10-20) sit inline in 'Key Principles' rather than a deprecated/old-patterns section, and some principles restate concepts Claude already knows ('A 50% loss requires a 100% gain to recover').	2 / 3
Actionability	Multiple complete, copy-paste-ready bash invocations with real flags for all three modes, plus a full JSON output example and a real referenced script — fully executable guidance.	3 / 3
Workflow Clarity	A clear 6-step sequence is present, but there are no explicit validation or verification checkpoints (e.g., confirming the output JSON or reconciling the binding constraint), so checkpoints are missing/implicit rather than explicit.	2 / 3
Progressive Disclosure	SKILL.md is an overview that points one level deep to a real, substantive references/sizing_methodologies.md and scripts/position_sizer.py via a clearly signaled Resources section; content is appropriately split.	3 / 3
	Total	10 / 12 Passed

Description

100%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong description: third-person voice, concrete capabilities, and an explicit 'Use when' trigger clause with broad natural-language keywords. It clearly distinguishes the skill and answers both what it does and when to invoke it.

Dimension	Reasoning	Score
Specificity	Lists multiple concrete actions — 'Calculate risk-based position sizes', 'stop-loss distance calculation, volatility scaling, and sector concentration checks' — rather than vague language.	3 / 3
Completeness	Explicitly answers both what ('Calculate risk-based position sizes for long stock trades') and when ('Use when user asks about...') with an explicit trigger clause.	3 / 3
Trigger Term Quality	'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' covers natural terms a user would actually say.	3 / 3
Distinctiveness Conflict Risk	The long-stock risk-sizing niche with specialized triggers (Kelly criterion, ATR-based sizing, fractional-share sizing) is clearly distinct and unlikely to fire for unrelated skills.	3 / 3
	Total	12 / 12 Passed

Validation

100%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository: tradermonty/claude-trading-skills
Path: skills/position-sizer/SKILL.md
Commit: 62a1635

Reviewed: 5 days ago

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