---
title: "mova-nautilus-teacher — Mova code model"
description: "Mova code model of tools/nautilus/src/teacher.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/tools/nautilus/src/teacher.rs.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

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# mova-nautilus-teacher

The groupant beside tools/nautilus/src/teacher.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

## Facts

- **kind:** groupant
- **status:** partial source bound model
- **source:** [`tools/nautilus/src/teacher.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/nautilus/src/teacher.rs)
- **source SHA-256:** `0d2ef86232e4ddd8…`
- **repository folder:** [`tools/nautilus/src/teacher.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/nautilus/src/teacher.rs.groupant)
- **repository commit:** `48f2e6f74146`

> **Implementation material.** A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.

## Components

| component | label | where |
|---|---|---|
| **approximant** | partial | [Forward approximant](#forward-approximant) |
| **ast** | partial | `syntax.json` |
| **composition** | partial | [Composition](#composition) |
| **cost** | partial | [Cost](#cost) |
| **descriptant** | present | [Descriptant](#descriptant) |
| **invariant** | partial | [Invariant](#invariant) |
| **tests** | finite evidence | [tests](#tests) |

## Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

| id | type | label | where |
|---|---|---|---|
| `behavior_complement` | behavior_complement | partial source derived model | [behavior_complement](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) |

## Model text


### model

## mova-nautilus-teacher

### Descriptant

The teacher interface of the animals that make teaching material: PrivateTerminal {id, ask(question) -> answer | Limit | Failed}, MovaTerminal (the thin adapter over mova-terminal ask_wait), Unplugged, plug, profiles as configuration (terminal id, mova-terminal profile, provider, model, purposes), submit with the operator's word, purpose, own-terminal, bound and journal-dedup gates, dictionary_task. Source: `tools/nautilus/src/teacher.rs`.

### Forward approximant

submit: validate config -> operator_word required -> profile serves purpose -> terminal id equals profile terminal -> valid bounded question -> hash not in journal -> journal reserved (fsync) -> ask -> journal answered (hash) | limit | failed.

### Invariant

At most one ask per question hash for the journal's life; nothing is asked without the operator's word.

### Cost

O(journal) per submit plus the terminal's time.

### Composition

Parent: `nautilus`. Parent: nautilus. Used by work and mova-turtle. State: Teacher journal (JSONL).

### behavior_complement

Holds no terminal itself (mova-terminal and crab-tmux-worker do); never retries, never replays an uncertain reservation, never admits an answer; profiles never share a terminal or its profile; nothing is asked without the operator's word. Evidence status: source-derived model with finite checks, not a proof.

### reverse_reconstruction

The journal recovers each question's hash, profile, terminal, provider/model labels, purpose, operator word and outcome with the answer's hash; not the question or answer text. No unique inverse is claimed.

### Epoch 2026-11-04

First model, written with the source; no prospective prediction is claimed beyond the checks.

### Epoch 2026-11-04 (terminal readiness)

`PrivateTerminal::ready` (default true; MovaTerminal: observed idle and no pending question). `submit` returns `{"state":"unavailable"}` before reserving when the terminal is not ready, so nothing is asked or journaled; the work loop answers `waiting` and keeps the item open. Measured: a loop started before its terminal had closed one item as held (2026-11-04); the new test `an_unready_terminal_leaves_the_item_open_and_asks_nothing` is red with the check removed.

### Epoch 2026-11-04 (senses)

TASK_MAX 99 000 (under mova-terminal's 100 000); unsent(text) for no tmux session/server; submit allows a question whose only outcome is one unsent failure to be asked once more; dictionary_task = work::draft_task over the rows Mova does not settle, at most BATCH. Red control: a crashed question is never asked again.

### tests

#### Checks

Command: cargo test --manifest-path tools/nautilus/Cargo.toml --offline --locked with MOVA_OCTOPUS_TEST_MODEL=$MOVA_DATA/download/0/0.4/en.bin (15 unit + 2 English tests; two identical runs on 2026-11-04).

Negative controls 2026-11-04 (each red, restored): no operator-word check; no terminal-id check; a limit not stopping the loop; stats drafting instead of reading.
These are finite fixtures; no teacher or model was called; not a proof.

2026-11-04 (senses): cargo test --release (0.4 en.bin), tools/nautilus 37 unit + 2 English tests, two identical runs; tools/turtle 9 + 2 pass. 2026-11-04 (senses): an_unsent_question_may_be_asked_once_more (red control: a crash is never asked again); profiles_validate_and_tasks_are_bounded: 25 words of 200 in one question under 20 000 bytes, examples cut, no counted line.