# Modified Mallampati class (Samsoon)

Mallampati

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/mallampati`
HTML: https://magentlab.com/docs/mallampati
Markdown: https://magentlab.com/docs/mallampati.md

Not a medical device. Not a diagnosis, dose, or listing recommendation.

## What it computes

Return the Samsoon 1987 modified Mallampati class 1-4 from a caller-assigned integer, with a stable label.

## When to use

When an agent already has a modified Mallampati class 1-4 as in Samsoon 1987 and needs the published score and label. magent does not look in the mouth or assign a class. Not original Mallampati 1985 three-class. Not a Cormack-Lehane grade.

## When not to use

- Not a medical device and not an airway exam or intubation order. magent does not look in the mouth.
- Samsoon 1987 modified four-class scale only (class IV added). Not original Mallampati 1985 three-class. Not a Cormack-Lehane grade.
- The caller assigns mallampati 1-4. magent does not examine the airway or invent an intubation-failure probability or difficult-airway cutoff.

## Formula

```
Modified Mallampati = caller-assigned integer class 1-4 (Samsoon 1987). Max 4
```

## Citation

[Difficult tracheal intubation: a retrospective study](https://doi.org/10.1111/j.1365-2044.1987.tb04039.x)
Samsoon GLT, Young JRB
Anaesthesia. 1987;42(5):487-490
DOI: [10.1111/j.1365-2044.1987.tb04039.x](https://doi.org/10.1111/j.1365-2044.1987.tb04039.x)

## Worked example

### Class I: soft palate, fauces, uvula, pillars

Given: `mallampati=1`

1. mallampati 1 → score 1; max 4; mallampati 1; class_1


### Class IV: soft palate not visible

Given: `mallampati=4`

1. mallampati 4 → score 4; max 4; mallampati 4; class_4


## Also searched as

- modified Mallampati
- Mallampati class
- Samsoon Mallampati
- Mallampati score
- Mallampati 1-4
- modified Mallampati class
- Samsoon 1987
- airway class

## Parameters

- `mallampati` (integer, required): Samsoon 1987 modified Mallampati class 1-4 as assigned by the caller (1: soft palate, fauces, uvula, pillars; 2: soft palate, fauces, uvula; 3: soft palate, base of uvula; 4: soft palate not visible at all). Not original Mallampati 1985 three-class. Not a Cormack-Lehane grade. magent does not look in the mouth.

## 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/mallampati`
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": [
    {
      "mallampati": "1"
    },
    {
      "mallampati": "1"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/mallampati

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/mallampati",
  "items": [
    {
      "components": [
        {
          "factor": "mallampati",
          "points": 1,
          "present": true
        }
      ],
      "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": "Samsoon GLT, Young JRB",
        "doi": "10.1111/j.1365-2044.1987.tb04039.x",
        "id": "samsoon-1987",
        "pmid": "3592174",
        "source": "Anaesthesia. 1987;42(5):487-490",
        "title": "Difficult tracheal intubation: a retrospective study"
      },
      "formula": "mallampati",
      "formula_expression": "Modified Mallampati = caller-assigned integer class 1-4 (Samsoon 1987). Max 4",
      "max_score": 4,
      "score": 1,
      "mallampati": 1,
      "mallampati_label": "class_1"
    },
    {
      "components": [
        {
          "factor": "mallampati",
          "points": 1,
          "present": true
        }
      ],
      "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": "Samsoon GLT, Young JRB",
        "doi": "10.1111/j.1365-2044.1987.tb04039.x",
        "id": "samsoon-1987",
        "pmid": "3592174",
        "source": "Anaesthesia. 1987;42(5):487-490",
        "title": "Difficult tracheal intubation: a retrospective study"
      },
      "formula": "mallampati",
      "formula_expression": "Modified Mallampati = caller-assigned integer class 1-4 (Samsoon 1987). Max 4",
      "max_score": 4,
      "score": 1,
      "mallampati": 1,
      "mallampati_label": "class_1"
    }
  ]
}
```

## Response fields

- `formula` (string): mallampati
- `formula_expression` (string): Published modified Mallampati class rule
- `score` (integer): Same as mallampati (1-4)
- `max_score` (integer): 4
- `mallampati` (integer): Caller-assigned Samsoon 1987 modified Mallampati class 1-4
- `mallampati_label` (string): Stable token for that class: class_1, class_2, class_3, or class_4
- `components` (array): mallampati component
- `citation` (object): Samsoon 1987
- `disclaimer` (string): Not a medical device

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "components": [
    {
      "factor": "mallampati",
      "points": 1,
      "present": true
    }
  ],
  "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": "Samsoon GLT, Young JRB",
    "doi": "10.1111/j.1365-2044.1987.tb04039.x",
    "id": "samsoon-1987",
    "pmid": "3592174",
    "source": "Anaesthesia. 1987;42(5):487-490",
    "title": "Difficult tracheal intubation: a retrospective study"
  },
  "formula": "mallampati",
  "formula_expression": "Modified Mallampati = caller-assigned integer class 1-4 (Samsoon 1987). Max 4",
  "max_score": 4,
  "score": 1,
  "mallampati": 1,
  "mallampati_label": "class_1"
}
```

## Errors

- HTTP 400 `invalid_mallampati`: mallampati must be 1, 2, 3, or 4 (Samsoon 1987 modified Mallampati). 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

- [Pediatric ETT size](https://magentlab.com/docs/pediatric-ett) — Compute Cole 1957 uncuffed pediatric endotracheal tube internal diameter from age in years.
- [Surgical Apgar](https://magentlab.com/docs/surgical-apgar) — Compute the Gawande 2007 intraoperative Surgical Apgar score from estimated blood loss, lowest mean arterial pressure, and lowest heart rate.

## 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.