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

# textlint-ja subset

> Selected rules from textlint-rule-preset-ja-technical-writing applied to Japanese Markdown blocks.

mehen ports a subset of [`textlint-rule-preset-ja-technical-writing`](https://github.com/textlint-ja/textlint-rule-preset-ja-technical-writing)
with their documented defaults.

## Rules

| Rule                                 | Default            | Check                            |
| ------------------------------------ | ------------------ | -------------------------------- |
| `sentence-length`                    | ≤ 100 chars        | Long-sentence flag.              |
| `max-comma`                          | ≤ 3 `,` / sentence | Over-comma'd sentences.          |
| `max-ten`                            | ≤ 3 `、` / sentence | Over-reading-marked sentences.   |
| `max-kanji-continuous-len`           | ≤ 6                | Hard-to-read kanji runs.         |
| `no-mix-dearu-desumasu`              | zone-aware         | JTF rule 1.                      |
| `ja-no-mixed-period`                 | `。`                | Sentence terminator consistency. |
| `no-double-negative-ja`              | —                  | `ないではない`.                        |
| `no-doubled-joshi`                   | `min_interval: 1`  | Repeated particles (`を…を`).      |
| `no-doubled-conjunctive-particle-ga` | —                  | Repeated `が`.                    |
| `no-doubled-conjunction`             | —                  | `しかし…しかし`.                       |
| `no-dropping-the-ra`                 | —                  | Colloquial `見れる` for `見られる`.     |
| `no-hankaku-kana`                    | —                  | Halfwidth kana forbidden.        |
| `no-exclamation-question-mark`       | —                  | `!` / `?` in technical docs.     |
| `ja-no-weak-phrase`                  | —                  | `かもしれない`, `と思います`.               |
| `ja-no-successive-word`              | —                  | Repeated words.                  |
| `ja-no-abusage`                      | —                  | Misused kanji.                   |
| `ja-no-redundant-expression`         | —                  | `することができる` → `できる`.              |
| `ja-unnatural-alphabet`              | —                  | IME miscarriages.                |

All thresholds are user-tunable via profile configuration.

## References

* textlint: [textlint.github.io](https://textlint.github.io).
* [`textlint-rule-preset-ja-technical-writing`](https://github.com/textlint-ja/textlint-rule-preset-ja-technical-writing).

## See also

* [JTF rules](/metrics/markdown/prose/jtf-rules) — orthogonal Japanese style guide.
* [Wording quality](/metrics/markdown/prose/wording-quality) — English style flags.