# Modified Hoehn and Yahr Stage (Goetz 2004) Modified Hoehn and Yahr Status: LIVE Price: $0.005 USDC `GET /api/calc/modified_hoehn_yahr` HTML: https://magentlab.com/docs/modified-hoehn-yahr Markdown: https://magentlab.com/docs/modified-hoehn-yahr.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Echo the caller-assigned Goetz 2004 Table 1 modified Hoehn and Yahr stage (1.0, 1.5, 2.0, 2.5, 3.0, 4.0, or 5.0) with the published description. No stage 0. magent does not examine the patient. ## When to use When an agent already has a modified Hoehn and Yahr stage as assigned by the caller and needs the published Table 1 description. magent does not examine the patient, assign stage from findings, map to UPDRS, or use the original integer-only 1-5 scale. ## When not to use - Not a medical device. magent does not examine the patient. - The caller assigns modified Hoehn and Yahr stage 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, or 5.0. magent does not examine the patient, perform a pull test, or assign stage from findings. - Not UPDRS. Not a diagnosis. Not an outcome measure. - Goetz 2004 recommended the original 1-5 Hoehn and Yahr scale for group description pending clinimetric testing of the modified form. This tool still implements the widely used modified Table 1 tokens (1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0). - Stage 0 is not in Table 1. This is not the original integer-only 1-5 scale as a separate tool. Not a treatment order. ## Formula ``` hy_stage in {1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0} as assigned by the caller (Goetz 2004 Table 1 modified Hoehn and Yahr). No stage 0. Not the original integer-only 1-5 scale. Not UPDRS. Not a diagnosis. Not an outcome measure. ``` ## Citation [Movement Disorder Society Task Force report on the Hoehn and Yahr staging scale: status and recommendations](https://doi.org/10.1002/mds.20213) Goetz CG, Poewe W, Rascol O, Sampaio C, Stebbins GT, Counsell C, Giladi N, Holloway RG, Moore CG, Wenning GK, Yahr MD Mov Disord. 2004;19(9):1020-1028 DOI: [10.1002/mds.20213](https://doi.org/10.1002/mds.20213) ## Worked example ### Stage 1.0 unilateral involvement only Given: `hy_stage=1.0` 1. hy_stage 1.0 as assigned by the caller 2. unilateral involvement only ### Stage 2.5 mild bilateral with recovery on pull test Given: `hy_stage=2.5` 1. hy_stage 2.5 as assigned by the caller 2. mild bilateral disease with recovery on pull test ### Stage 5.0 wheelchair bound or bedridden unless aided Given: `hy_stage=5.0` 1. hy_stage 5.0 as assigned by the caller 2. wheelchair bound or bedridden unless aided ## Also searched as - modified Hoehn and Yahr - Hoehn Yahr stage - Goetz 2004 Hoehn and Yahr - HY 1.0 1.5 2.5 - Parkinson modified stage - pull test Hoehn Yahr - mHY stage - unilateral axial Hoehn Yahr ## Parameters - `hy_stage` (string, required): Goetz 2004 Table 1 modified Hoehn and Yahr stage as assigned by the caller: 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, or 5.0 (exact tokens; reject 1, 3, 0, 0.5, 2.5.0). 1.0 unilateral only; 1.5 unilateral and axial; 2.0 bilateral without impairment of balance; 2.5 mild bilateral with recovery on pull test; 3.0 mild to moderate bilateral with some postural instability, physically independent; 4.0 severe disability, still able to walk or stand unassisted; 5.0 wheelchair bound or bedridden unless aided. No stage 0. Not the original integer-only 1-5 scale. Not UPDRS. magent does not examine the patient. ## Bulk (POST) POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement. Method: `POST /api/calc/modified_hoehn_yahr` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: PREVIEW - 1 to 25 items. Each item uses the same keys as the GET query parameters. - POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows. - The first invalid item fails the whole request (index in the 400 JSON). You are not charged. - HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row. - Catalog misses (empty matches, found=false) stay paid 200s inside that slot. - x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items. Example request: ```json { "items": [ { "hy_stage": "1.0" }, { "hy_stage": "1.0" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/modified-hoehn-yahr Example 200: ```json { "count": 2, "path": "/api/calc/modified_hoehn_yahr", "items": [ { "description": "Unilateral involvement only", "components": [ { "factor": "stage_1_0", "met": true }, { "factor": "stage_1_5", "met": false }, { "factor": "stage_2_0", "met": false }, { "factor": "stage_2_5", "met": false }, { "factor": "stage_3_0", "met": false }, { "factor": "stage_4_0", "met": false }, { "factor": "stage_5_0", "met": false } ], "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "Goetz CG, Poewe W, Rascol O, Sampaio C, Stebbins GT, Counsell C, Giladi N, Holloway RG, Moore CG, Wenning GK, Yahr MD", "doi": "10.1002/mds.20213", "id": "goetz-2004", "pmid": "15372591", "source": "Mov Disord. 2004;19(9):1020-1028", "title": "Movement Disorder Society Task Force report on the Hoehn and Yahr staging scale: status and recommendations" }, "formula": "modified_hoehn_yahr", "formula_expression": "hy_stage in {1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0} as assigned by the caller (Goetz 2004 Table 1 modified Hoehn and Yahr). No stage 0. Not the original integer-only 1-5 scale. Not UPDRS. Not a diagnosis. Not an outcome measure.", "hy_stage": "1.0" }, { "description": "Unilateral involvement only", "components": [ { "factor": "stage_1_0", "met": true }, { "factor": "stage_1_5", "met": false }, { "factor": "stage_2_0", "met": false }, { "factor": "stage_2_5", "met": false }, { "factor": "stage_3_0", "met": false }, { "factor": "stage_4_0", "met": false }, { "factor": "stage_5_0", "met": false } ], "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "Goetz CG, Poewe W, Rascol O, Sampaio C, Stebbins GT, Counsell C, Giladi N, Holloway RG, Moore CG, Wenning GK, Yahr MD", "doi": "10.1002/mds.20213", "id": "goetz-2004", "pmid": "15372591", "source": "Mov Disord. 2004;19(9):1020-1028", "title": "Movement Disorder Society Task Force report on the Hoehn and Yahr staging scale: status and recommendations" }, "formula": "modified_hoehn_yahr", "formula_expression": "hy_stage in {1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0} as assigned by the caller (Goetz 2004 Table 1 modified Hoehn and Yahr). No stage 0. Not the original integer-only 1-5 scale. Not UPDRS. Not a diagnosis. Not an outcome measure.", "hy_stage": "1.0" } ] } ``` ## Response fields - `formula` (string): modified_hoehn_yahr - `formula_expression` (string): Published Goetz 2004 Table 1 modified Hoehn and Yahr token rule - `hy_stage` (string): Caller-assigned token 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, or 5.0 - `description` (string): Goetz 2004 Table 1 modified-column wording for that stage - `components` (array): Per-stage Tree rows stage_1_0, stage_1_5, stage_2_0, stage_2_5, stage_3_0, stage_4_0, stage_5_0 with factor and met; exactly one is met - `citation` (object): Goetz 2004 Mov Disord citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "description": "Unilateral involvement only", "components": [ { "factor": "stage_1_0", "met": true }, { "factor": "stage_1_5", "met": false }, { "factor": "stage_2_0", "met": false }, { "factor": "stage_2_5", "met": false }, { "factor": "stage_3_0", "met": false }, { "factor": "stage_4_0", "met": false }, { "factor": "stage_5_0", "met": false } ], "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "Goetz CG, Poewe W, Rascol O, Sampaio C, Stebbins GT, Counsell C, Giladi N, Holloway RG, Moore CG, Wenning GK, Yahr MD", "doi": "10.1002/mds.20213", "id": "goetz-2004", "pmid": "15372591", "source": "Mov Disord. 2004;19(9):1020-1028", "title": "Movement Disorder Society Task Force report on the Hoehn and Yahr staging scale: status and recommendations" }, "formula": "modified_hoehn_yahr", "formula_expression": "hy_stage in {1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0} as assigned by the caller (Goetz 2004 Table 1 modified Hoehn and Yahr). No stage 0. Not the original integer-only 1-5 scale. Not UPDRS. Not a diagnosis. Not an outcome measure.", "hy_stage": "1.0" } ``` ## Errors - HTTP 400 `invalid_modified_hoehn_yahr`: hy_stage must be 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, or 5.0 (Goetz 2004 modified Hoehn and Yahr Table 1). Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - None ## Payment Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/docs/mcp ## Guarantees - HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON. - exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE. - HTTP 402 is unpaid only. Do not sign a second authorization because of a 503. - Execution is timeout-bounded and concurrency-capped. - Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.