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synterr

Error types

synterr-nlp/synterr

Error types (Russian)¶

Twenty-five handlers (69 subtypes) covering five categories. The full subtype lists and Rozental § mappings are in CLAUDE.md; LoRuGEC rule coverage is verified in docs/research/LORUGEC_COVERAGE.md (36/48 FULL, 12/48 PARTIAL).

Spelling — `SPELL`¶

Handler	What it does	Example
`spelling`	Phonetic confusions, keyboard typos	молоко → малако
`function_spelling`	не/ни attachment, conjunction split/merge, -таки	чтобы → что бы
`orthographic_spelling`	пре/при, ы/и after prefixes, suffixes, participles	преинтересный → приинтересный
`compound_spelling`	Hyphen / solid / separate writing of compounds	по-моему → по моему
`adverb_spelling`	Adverb writing variants (4 directional subtypes)	по-русски → по русски

Morphological — `MORPH`¶

Handler	What it does	Example
`noun_case`	Wrong case on governed noun (obl/nmod/iobj/obj)	на столе → на стол
`noun_number`	Singular ↔ plural	книга → книги
`adj_case`, `adj_number`, `adj_gender`	Adjective agreement errors via `amod` arc	новая книга → новый книга
`verb_person_number`	Verb conjugation against `nsubj`	они читает → они читают
`verb_tense`	Past / present / future swap	читал → читает
`numeral_declension`	Numeral declension errors	полтора часа → полутора часа

Lexical — `OTHER`¶

Handler	What it does
`paronym`	Confusable word pairs (одеть / надеть)
`preposition`	Wrong preposition
`conjunction`	Wrong conjunction
`pleonasm`	Tautological phrases (главный приоритет)
`collocation`	Lexical compatibility violations

Structural — `OTHER`¶

Handler	What it does
`word_omission`	Drop a token
`word_insertion`	Insert an extraneous token

Punctuation — `PUNCT`¶

Handler	What it does
`comma_delete`	Delete a comma at clause boundaries (5 dep-tree-classified subtypes)
`comma_pair_delete`	Delete both commas of an isolated phrase (5 subtypes)
`comma_insert`	Add a spurious comma (before как, in set phrases, between conjunctions)
`dash_delete`	Delete a required dash (subj/pred, asyndetic, other)

Schema mapping cheat sheet¶

# See current mappings
uv run synterr coverage --lang ru --schema rlc
uv run synterr coverage --lang ru --schema rozental
uv run synterr coverage --lang ru --schema errant