Jock Taxes Developer MCP

Compare NBA move

player_movement_nba

Compare after-tax income when a NBA player moves from one team to another at the same gross pay. Ask for the origin team, destination team, filing status, and either gross_salary or base_salary. Do not invent team codes. Call list_tax_calculator_inputs for allowed values. Present the result as a calculation, not as tax or legal advice. Required before this call: from_team, to_team, and gross_salary or base_salary. Match a player with list_team_players only after league, team, and season_id are known. Repeat inputs and defaults from the result in the reply. Results are income tax only unless the user asks for take-home: then send include_payroll_taxes, agent_fee_pct, retirement_contribution (401(k), or RRSP on a Canadian club) or rca_contribution (Canadian clubs), and report result.net_pay. Comparisons then match on net_pay.net_economic, which counts an RCA after its estimated payout tax (rca_payout_tax_rate; default 25% Canadian withholding on the US-duty-day share and the US federal marginal rate on the rest, or 25% on all of it for a US person).

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "from_team": "<from_team>",
      "to_team": "<to_team>"
    },
    "name": "player_movement_nba"
  }
}

Input Schema

Name	Required	Description
`to_team`	Yes	Team the player joins.
`from_team`	Yes	Team the player leaves.
`season_id`	No	Schedule season as eight digits, such as 20252026. Defaults to the latest season for the league when omitted.
`base_salary`	No	Duty-day base in whole dollars before signing and performance bonuses. Send this with the bonus fields to match Salary + Bonuses. Leave it out when sending gross_salary.
`gross_salary`	No	One season total, taxed entirely as duty-day pay. Leave this out when sending base_salary.
`agent_fee_pct`	No	Agent fee as a percent of gross pay (0-10), treated as a non-deductible cost. Default 0.
`birth_country`	No	Birth country code used with is_us_person.
`filing_status`	No	Single or Married_Joint. Defaults to Single when omitted.
`signing_bonus`	No	Signing bonus in whole dollars. The site adds this into the season total. On NFL it also includes other inducement pay.
`contract_season`	No	Contract season label, such as 2025-26.
`primary_domicile`	No	Resident tax home: a state, a city, or a mode such as local_jurisdiction. Defaults to local_jurisdiction when omitted.
`rca_contribution`	No	Salary deferred into a Retirement Compensation Arrangement by a Canadian club, in USD. Excluded from Canadian employment income until paid out: from worldwide income for a Canadian resident and in full from Canadian-source pay for a non-resident (Martin v. The King, 2024 TCC 153). US tax is unchanged. Not applied for US clubs. Comparisons count it after the estimated tax at payout (see rca_payout_tax_rate). Default 0.
`performance_bonus`	No	Performance bonus in whole dollars. Included in the total only when include_performance_bonus_in_jock_tax is true.
`rca_payout_tax_rate`	No	Estimated tax on the RCA when it is paid out, as a percent (0-100). Default models a player who retires to a no-tax US state and draws the RCA and its refundable tax account down at once: the US-duty-day share, already taxed by the US when contributed, bears Canada's 25% non-resident withholding, and the rest bears the US federal marginal rate on it (37% for a high earner). For a US person, who pays US tax on the whole contribution now, the default is the 25% withholding alone. Lowers net_pay.net_economic, which comparisons match on.
`retirement_catch_up`	No	none (default), 50_plus (+$8,000) or 60_to_63 (+$11,250). Catch-up contributions are always Roth for athletes (prior-year FICA wages over $150,000).
`include_payroll_taxes`	No	Opt in to employee payroll taxes for each team's employer: FICA (Social Security, Medicare, Additional Medicare) and the home state's disability or paid-leave levy for US clubs; CPP/QPP, EI and QPIP for Canadian clubs. Default false. For a Canadian resident it also applies the CPP/QPP and EI credits and the enhanced CPP/QPP deduction on the Canadian return. With any take-home option set, from_after_tax and to_after_tax use net_pay.net_economic and the response adds from_ and to_ net_pay, payroll_taxes, agent_fee and retirement_contribution.
`art_xvi4_inducement_sb`	No	Opt in to Canada–U.S. Treaty Art. XVI(4) on an exempt signing bonus from a Canadian club.
`estimated_playoff_games`	No	Extra postseason games. Use 0 when there are none.
`retirement_contribution`	No	Annual retirement contribution in USD. On a US club it is a 401(k) elective deferral capped at the 2026 limit ($24,500 plus catch-up). On a Canadian club it is an RRSP contribution capped at C$33,810, deducted from Canadian taxable income only. Default 0.
`comparison_primary_domicile`	No	Resident tax home modeled on the destination team.
`retirement_contribution_type`	No	401(k) only: pretax (default) lowers income-tax wages except in Pennsylvania, Philadelphia, Pittsburgh, Ohio cities, Kansas City and St. Louis; roth lowers nothing. RRSP contributions are always deductible.
`exempt_signing_bonus_from_jock_tax`	No	When true, the signing bonus is taxed in the player's domicile and left out of duty-day allocation.
`include_performance_bonus_in_jock_tax`	No	When true, performance_bonus is part of the season total and of duty-day pay.

Output Schema

Name	Required	Description	Default
`sport`	Yes
`inputs`	Yes
`result`	Yes
`defaults`	Yes
`disclaimer`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedOct 26, 2026

addedInput schema / properties / agent_fee_pct

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Agent fee as a percent of gross pay (0-10), treated as a non-deductible cost. Default 0.",
+  "title": "Agent Fee Pct"
+}

addedInput schema / properties / include_payroll_taxes

Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Opt in to employee payroll taxes for each team's employer: FICA (Social Security, Medicare, Additional Medicare) and the home state's disability or paid-leave levy for US clubs; CPP/QPP, EI and QPIP for Canadian clubs. Default false. For a Canadian resident it also applies the CPP/QPP and EI credits and the enhanced CPP/QPP deduction on the Canadian return. With any take-home option set, from_after_tax and to_after_tax use net_pay.net_economic and the response adds from_ and to_ net_pay, payroll_taxes, agent_fee and retirement_contribution.",
+  "title": "Include Payroll Taxes"
+}

addedInput schema / properties / rca_contribution

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Salary deferred into a Retirement Compensation Arrangement by a Canadian club, in USD. Excluded from Canadian employment income until paid out: from worldwide income for a Canadian resident and in full from Canadian-source pay for a non-resident (Martin v. The King, 2024 TCC 153). US tax is unchanged. Not applied for US clubs. Comparisons count it after the estimated tax at payout (see rca_payout_tax_rate). Default 0.",
+  "title": "Rca Contribution"
+}

addedInput schema / properties / rca_payout_tax_rate

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Estimated tax on the RCA when it is paid out, as a percent (0-100). Default models a player who retires to a no-tax US state and draws the RCA and its refundable tax account down at once: the US-duty-day share, already taxed by the US when contributed, bears Canada's 25% non-resident withholding, and the rest bears the US federal marginal rate on it (37% for a high earner). For a US person, who pays US tax on the whole contribution now, the default is the 25% withholding alone. Lowers net_pay.net_economic, which comparisons match on.",
+  "title": "Rca Payout Tax Rate"
+}

addedInput schema / properties / retirement_catch_up

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "none (default), 50_plus (+$8,000) or 60_to_63 (+$11,250). Catch-up contributions are always Roth for athletes (prior-year FICA wages over $150,000).",
+  "title": "Retirement Catch Up"
+}

addedInput schema / properties / retirement_contribution

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Annual retirement contribution in USD. On a US club it is a 401(k) elective deferral capped at the 2026 limit ($24,500 plus catch-up). On a Canadian club it is an RRSP contribution capped at C$33,810, deducted from Canadian taxable income only. Default 0.",
+  "title": "Retirement Contribution"
+}

addedInput schema / properties / retirement_contribution_type

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "401(k) only: pretax (default) lowers income-tax wages except in Pennsylvania, Philadelphia, Pittsburgh, Ohio cities, Kansas City and St. Louis; roth lowers nothing. RRSP contributions are always deductible.",
+  "title": "Retirement Contribution Type"
+}

First observedOct 22, 2026

TDQS

A4.1/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes well beyond the annotations by disclosing what the response contains (from_/to_ net_pay, payroll_taxes, agent_fee, retirement_contribution), how comparisons match (net_pay.net_economic), and the compliance framing ('Present the result as a calculation, not as tax or legal advice'). Much of the RCA/withholding detail restates schema text already at 100% coverage, so the marginal value is real but partly duplicative.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The purpose is front-loaded in the first sentence, but the rest is a single dense paragraph of run-on sentences mixing prerequisites, alternatives, output handling, and RCA tax modeling without ordering or bullets. Every sentence carries information, yet the packaging makes it hard to scan for an agent.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 23-parameter tool it covers prerequisites, sibling routing, default behaviors, and the take-home opt-in path, and an output schema exists so return values need less explanation than given. The main gap is that the boundary against calculate_nba_tax and equivalent_nba_salary is only implied by 'moves from one team to another' rather than stated.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3; the description earns above that by organizing 23 parameters into a decision flow — the minimal set for an income-tax comparison versus the additional set required for take-home — and by flagging the gross_salary/base_salary mutual exclusion in prose. It still does not explain several parameters (birth_country, comparison_primary_domicile, estimated_playoff_games) that the schema covers only briefly.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

Opens with a specific verb and resource: 'Compare after-tax income when a NBA player moves from one team to another at the same gross pay,' which is clearly a two-team comparison and therefore distinguishable from the single-team calculate_nba_tax and equivalent_nba_salary siblings, though it never names those siblings explicitly.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states required inputs (from_team, to_team, and gross_salary or base_salary), warns 'Do not invent team codes' and routes to list_tax_calculator_inputs for allowed values, and gates list_team_players behind league/team/season_id. It also states the when-to-use branch for take-home modeling ('Results are income tax only unless the user asks for take-home') along with the exact parameters to add in that case.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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