Elamur Groupantsmova-whale-contract
The groupant beside tools/whale/src/contract.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
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 |
| ast | partial | syntax.json |
| composition | partial | Composition |
| cost | partial | Cost |
| descriptant | present | Descriptant |
| invariant | partial | Invariant |
| tests | finite evidence | tests.md |
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 |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
Model text
Descriptant
Configured output contract: length measure and projection, field rules, verbatim guard and bundle rendering. Source: tools/whale/src/contract.rs. Public, domain-agnostic: concrete prompts, schemas, gate parameters and deployments come from pinned configuration.
Forward approximant
validate: length field count in [min,max] in the configured unit without forbidden substrings (error prefix length gate:), then each field rule (equals; nonempty bounded text; bounded nonempty string lists; object lists with text/list/enum fields, distinctness and required member values), reply byte budget and verbatim context run. project: for an oversized field cut at the last paragraph break, else last sentence end, whose prefix count is admitted; record a trace. rewrite_statuses keeps the claimed value and downgrades the rest; artifacts renders text, bullet lists, JSON projections and the metadata file.
Invariant
A validated body satisfies every configured rule; a projection output is a byte prefix of the input whose count is in [min,max] and never pads or rewrites; status rewrites retain the teacher claim; artifact order follows the specification.
Cost
Word counting O(n); projection O(n * boundaries * n) worst case from recounting prefixes; validation O(reply); verbatim guard O(tokens) BTreeSet.
Composition
Called by whale::admit and whale::project_quarantined_lengths; publish renders artifacts after validation.
behavior_complement
Excluded: out-of-range length, blank or oversized fields, duplicates by distinct_by, missing required members, values outside enums, equality mismatches, replies above budget, configured verbatim runs, oversized fields without an admitted boundary or with forbidden substrings. Counterexample: an oversized field with no paragraph/sentence boundary is not projected. Evidence status: source-derived model with finite checks, not a proof.
reverse_reconstruction
From a projected field all originals with the same prefix and a longer tail are compatible; the trace pins input/output hashes and boundary, so the original is recovered only with the retained reply. A validated count admits many texts. No unique inverse is claimed.
Epoch 2026-11-04 (Whales in English)
Epoch 2026-11-04: tests of word bounds on a fixture spec (4000..5000: 3999 and 5001 refused; 5002 with a sentence end projected to 5000; 5001 without one refused) and an opt-in MOVA_WHALE_SPEC_CHECK test of a deployment spec. No production change.
tests.md
6 tests: word/scalar units, equality and fence refusal, object rules, verbatim runs, projection boundaries, status rewrite and artifact order.
Command: cargo test --manifest-path tools/whale/Cargo.toml --offline --locked (74 tests, fake teachers/executables; two identical runs on 2026-11-03). These are finite fixtures; no live run, model call or deployment was exercised.
2026-11-04: cargo test --manifest-path tools/whale/Cargo.toml --offline --locked with MOVA_OCTOPUS_TEST_MODEL=$MOVA_DATA/download/0/0.4/en.bin (unit tests incl. 5 service tests, 2 realizer tests, 3 length-gate tests; 2 English tests: 18 prompts, 10 refusals, a served end-to-end run with the real mova-whale child and a fake Codex executable; two identical runs on 2026-11-04)
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/tools/whale/src/contract.rs.groupant/