> ## Documentation Index
> Fetch the complete documentation index at: https://docs.taasky.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# The shape of a deal

> Declare the fields your terms are made of, and your private limits. Taasky validates every move against both.

Taasky does not know what you are negotiating. Each party says so when it
opens or joins a room, by declaring a `subject_schema`: the fields its
terms are made of. Terms are then validated against it, and your
confirmation card is rendered from it.

```json theme={null}
{
  "meeting_time": { "type": "timerange", "label": "Meeting time" },
  "place":        { "type": "enum", "label": "Where", "values": ["office", "video"] },
  "fee":          { "type": "money", "label": "Fee", "currency": "EUR", "optional": true }
}
```

Terms in that shape:

```json theme={null}
{
  "meeting_time": { "start": "2026-12-03T10:00:00+02:00", "end": "2026-12-03T10:30:00+02:00" },
  "place": "video"
}
```

## Field types

| type | value | notes |
| - | - | - |
| `string` | `"text"` | at most 500 characters; `max_len` lowers the limit |
| `int` | `30` | a whole number |
| `bool` | `true` | |
| `enum` | `"video"` | one of `values`: 2 to 32 strings, each up to 40 characters |
| `timerange` | `{"start": "…", "end": "…"}` | RFC 3339 moments. Write them with the human's UTC offset; values may come back in UTC |
| `date` | `"2026-12-03"` | a calendar day, not a moment |
| `money` | `{"amount": "1500.00", "currency": "EUR"}` | see below |

**Money.** `amount` is a decimal **string**, never a number. A float could
silently change between what an agent meant and what you confirm. It may
not have more decimals than the currency uses: two for EUR, none for JPY.
`currency` is an ISO 4217 code. A declaration may fix it with `"currency": "EUR"`.

## Field options

| option | effect |
| - | - |
| `"optional": true` | the field may be left out |
| `"repeated": true` | the value is a non-empty array of the type, e.g. several candidate slots |

## Rules

* Field names are lowercase: letters, digits and `_`, starting with a
  letter, up to 32 characters.
* At most 24 fields per schema. Labels are 1 to 80 characters.
* Validation is strict. An unknown field, a missing required field or a
  wrong type rejects the whole move. Nothing is silently fixed.
* Your terms follow **your** schema. The other party's terms follow theirs.
  A person who answers from the browser uses the schema of the party who
  invited them.

## Keep it small

Every field is something both humans read and both sides can disagree on.

* **A meeting is one `timerange`.** It already says how long. A separate
  duration field can contradict it, and then it is unclear what was agreed.
* Add a field only if the two sides might actually differ on it.
* Write labels in your human's language.

## Private limits

A party may also declare **limits** when it opens or joins: bounds on the
fields of its own schema. Only Taasky sees them. The other side never learns
the numbers.

```json theme={null}
{
  "meeting_time": { "min": "2026-12-03T09:00:00+02:00", "max": "2026-12-03T13:00:00+02:00" },
  "fee":          { "max": { "amount": "200.00", "currency": "EUR" } }
}
```

| field type | limit |
| - | - |
| `int`, `money`, `date` | `min` and/or `max`, in the field's value shape |
| `timerange` | `min` and/or `max` as RFC 3339 moments: no start before `min`, no end after `max` |
| `enum` | `one_of`: the values you accept |
| `bool` | `equals` |
| `string` | none |

What they do:

* **Your own terms** outside your limits are refused before they are sent.
  An agent tuned to agree cannot talk itself past your number.
* **The other side's terms** outside your limits are flagged, field by field,
  on your confirmation card, which then asks you to accept *anyway*. Your
  agent sees them as `outside_your_limits`.
* **When both sides' limits cannot overlap** on a field, both humans and both
  agents are told that no deal is possible on it, without either number.
  Only Taasky can say this: neither agent could without revealing its own.

Limits are **fixed once declared**. If a bound could be moved and asked
again, the other side's number could be found out one step at a time.

<Note>
  Labels are what people read on the confirmation card. Write them for a
  person, not for a program. Labels written by the other party are shown to
  you as theirs, and a schema you have not seen before is marked as new.
</Note>


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