# create

URL: /business/nouns/hypothesis/create · Id: `verb:Hypothesis.create` · Call: `await $.Hypothesis.create({ … })` (SDK) or the `do` tool at `https://api.sb/mcp`. Inputs says what to pass, Outputs what returns, When it waits who approves.

> Creates a Hypothesis.

Create makes a new [Hypothesis](/business/nouns/hypothesis) from the inputs below. It is inherited: every [Noun](/business/nouns/noun) has `get`, `list`, `create`, `update` and `delete`.

## Inputs
| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `statement` | `text` | Yes | The belief, in one sentence. |
| `kind` | `string` | Yes | One of `founding`, the five slots (`customer`, `problem`, `approach`, `switch`, `differentiation`), or `loop`. |
| `parent` | [Hypothesis](/business/nouns/hypothesis) | No | The Founding Hypothesis a slot Hypothesis belongs to. |
| `metric` | [Metric](/business/nouns/metric) | No | The Metric that settles it. |
| `threshold` | `string` | No | The Metric value that settles it. |
| `grade` | `string` | No | Computed: the strongest grade of its outside Evidence, `None` without any. |

## Outputs
| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `hypothesis` | [Hypothesis](/business/nouns/hypothesis) | Yes | The Hypothesis. |

## Effects
- Emits `Hypothesis.created`.
- Two-way: `try`, `send`, `do`.

## Refuses when
| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | [Hypothesis.create](/business/nouns/hypothesis/create) |

## When it waits
| Gate | Default |
| --- | --- |
| Decision class | Low: two-way, nothing at stake |
| [Delay window](/systems/trust-and-governance/controls/one-way-windows) | None: it runs once review passes. |
| Limit | The call [Limit](/business/nouns/limit) of the [Permission](/business/nouns/permission) it runs under. |
| Over the Limit | It waits `pending` for an [Approval](/business/nouns/approval) from the [Founder](/agents/founding/founder). Approved, it runs; refused, it ends `refused` with [`limit-exceeded`](/code/api/errors/limit-exceeded); unanswered by its deadline, it ends `canceled`. |

## Example

**Ask**

```text
Add a hypothesis to QuietCopy.
```

**API**

```bash
curl -X POST https://api.sb/quietcopy.com/hypotheses \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"statement":"Reviews résumés against the job they target.","kind":"founding"}'
```

```json
{
  "api": "https://api.sb/quietcopy.com",
  "hypothesis": {
    "$id": "https://api.sb/quietcopy.com/hypotheses/hypothesis_1",
    "$type": "Hypothesis",
    "statement": "Reviews résumés against the job they target.",
    "kind": "founding",
    "verdict": "Open",
    "version": 1
  },
  "action": {
    "$id": "https://api.sb/quietcopy.com/actions/action_1",
    "operation": "Hypothesis.create",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/quietcopy.com/actions/action_1"
  }
}
```

**SDK**

```ts
import { $ } from 'startup-builder'

const hypothesis = await $.Hypothesis.create({ statement: 'Reviews résumés against the job they target.', kind: 'founding' })
```

**CLI**

```bash
npx startup-builder do Hypothesis.create --json '{"statement":"Reviews résumés against the job they target.","kind":"founding"}'
```

**MCP**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Hypothesis.create({ statement: 'Reviews résumés against the job they target.', kind: 'founding' })"
  }
}
```

Next: [`Offer.create`](/business/nouns/offer/create) (in `guide:find-out-if-anyone-wants-this`), [`Experiment.create`](/business/nouns/experiment/create) (in `guide:spend-200-to-test-faster`).

Guides that call it: [Find out if anyone wants this](/start/guides/find-out-if-anyone-wants-this), [Spend $200 to test faster](/start/guides/spend-200-to-test-faster).