tres-cost-basis

TRES Finance — Cost Basis Management

End-to-end skill for managing cost basis calculation, strategy configuration, reevaluations, financial issue review, and related operations in TRES Finance.

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MCP Server

All calls use the user-tres-finance MCP server (the TRES Finance MCP connector).

All variable keys and nested input fields MUST use camelCase (e.g. assetClassId, not asset_class_id).

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Step 1 — Authenticate and confirm org

Call get_viewer with no arguments. Confirm the org name with the user if there is any ambiguity.

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Step 2 — Ensure a cost basis strategy is defined (gate before calculation)

Before any cost basis calculation can run, the organization must have a strategy defined. This step is a prerequisite gate — run it automatically whenever the user wants to calculate cost basis (Section D), or when they first ask for help with cost basis.

1. Fetch the current strategy using the query in Section B.

2. If defaultStrategy is returned (any valid value like FIFO, LIFO, etc.), the strategy is already set — skip ahead and inform the user:

   "Your cost basis strategy is set to [STRATEGY]. Proceeding."

3. If no strategy is configured (the query returns null or an error), present the user with all available methods and ask them to choose:

   "Before calculating cost basis, you need to choose a costing method. Here are the available strategies:

   1. FIFO — First-in, first-out. Earliest acquired lots are disposed first. The most common method.
   2. LIFO — Last-in, first-out. Most recently acquired lots are disposed first.
   3. AVG — Weighted average cost across all lots.
   4. MAX_GAINS — Disposes lowest-cost lots first, maximizing realized gains.
   5. MAX_LOSSES — Disposes highest-cost lots first, maximizing realized losses (useful for tax-loss harvesting).
   6. FIFO_IMPAIRMENT — FIFO with impairment accounting support (for orgs using impairment write-downs).

   Which method would you like to use?"