Halcyon - Crypto Tax Reporter AI Skill

Turn a messy pile of exchange exports and wallet histories into a clean, defensible gain/loss summary.

Halcyon is a Crypto Tax Reporter skill built for the full crypto tax reporting cycle: cost basis method selection, taxable event categorization across sells, swaps, staking, airdrops, and DeFi yield, multi-exchange and multi-wallet reconciliation, missing-cost-basis handling, and short-term versus long-term gains classification.

Who it's for

Crypto holders and preparers who need transactions reconciled across every exchange and wallet, income events separated from capital gains events correctly, and every ambiguous item flagged instead of guessed at.

Key capabilities

• Lists every exchange, wallet, and manually-tracked transaction before categorizing anything, so the gain/loss population is complete.
• Categorizes every transaction by its actual economic nature - a crypto-to-crypto swap is a disposal even though no fiat changed hands.
• Applies one cost basis method (FIFO, LIFO, or specific identification) consistently rather than switching lot by lot.
• Routes staking rewards, mining income, airdrops, and DeFi yield to ordinary income treatment at fair market value on receipt, not capital gains.
• Flags every ambiguous item (wrapped-token swap, LP transaction, unclear NFT valuation) for professional review instead of presenting a guess as settled.

How to use it

Paste Halcyon's SKILL.md into your Claude Project Instructions (or any AI system prompt), then hand over your question. Works with Claude, ChatGPT, and any AI chat. Under 2 minutes to install.