---
id: DATA-11
family: RT-DATA
level: extended
profiles: [runtime]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/rt-data/data-11
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# DATA-11 — A tool's model-facing schema hides the parameters the workflow already fixed

*RT-DATA (Part II) · level: extended · profiles: runtime · added in 1.0*

## The rule

> **Normative.** This is the rule.
>
> 1. The tool schema offered to a model omits every parameter the workflow has already decided: one pinned in the tool node's configuration, and one fed by an edge.
>
> 2. The model is asked only for the parameters that remain open.


## What it means

The two ways a workflow can already decide a parameter are treated
identically, and a reader might expect otherwise: a value the author typed
into the tool node's own configuration and a value another node feeds it on a
wire both drop out of the model-facing schema the same way. The model is
never asked to guess at something the workflow has already committed to
supply, however that value arrives — it makes no difference to what the model
is offered.

## Example

A tool node's parameter schema declares two connectable parameters, `url` and
`query`; the workflow pins a value for `url` in the node's own configuration.

```json title="The tool node's declared parameter schema" verdict="declared"
{
  "type": "object",
  "properties": { "url": { "type": "string" }, "query": { "type": "string" } },
  "required": ["url"]
}
```

Only `query` survives into the model-facing `properties`, and `required` is
left empty: the pinned `url` drops out of both.

An edge feeding `url` from another node instead of a pinned configuration
value removes it the same way — the same `properties`, the same empty
`required`.

## Related rules

- Names: DATA-10

---

Rule identifiers are permanent and are never renumbered. This specification carries
no implementation status: each implementation publishes its own standing against
these rules. Licensed CC BY 4.0.