Spelling

Finds misspellings in identifiers, comments and documentation, where a typo becomes a public API or a search miss.

V1003 technique

19 of 256 scanned repositories run it (7%)

Sub-techniques

ID	Name	Description
`V1003.001`	Identifier typo detection	Split camelCase and snake_case identifiers and flag known misspellings.
`V1003.002`	Prose spell check	Dictionary check over docs and comments with a project word list.

Craft it

Start with a low false-positive tool (typos or codespell) on the whole tree.
Add an allow-list file for domain words instead of disabling the check.
Run it in pre-commit and in CI with autofix locally.

Reverse engineer it

Signs that a codebase already runs this technique, and where to read how it is configured.

_typos.toml, .codespellrc or cspell.json in the repository.
A codespell or typos hook in .pre-commit-config.yaml.

Where the scanned repositories configure it:

.github/workflows/*.yml in 15 repositories
.pre-commit-config.yaml in 11 repositories
pyproject.toml in 10 repositories
.codespellrc in 5 repositories
Makefile in 3 repositories
tox.ini in 1 repositories

Detected by the scanner as: Spelling (typos in identifiers, comments and docs.)

Open-source packages

typos crate-ci/typos
codespell codespell-project/codespell
CSpell streetsidesoftware/cspell

Tools seen in scans

by repositories that run them

Tool	Repos	Command seen	Runs in	Docs
`codespell`	22	`codespell`	pre-commit, ci, local	docs

Procedure examples

repositories that run it, most-starred first

Repository	Tools	Runs in	Evidence
TheAlgorithms/Python	`codespell`	pre-commit, ci	`.pre-commit-config.yaml ci (pre-commit.ci)`
langflow-ai/langflow	`codespell`	local	`Makefile target codespell (line 194)`
home-assistant/core	`codespell`	pre-commit	`.pre-commit-config.yaml hooks.codespell`
pallets/flask	`codespell`	pre-commit, ci, local	`.github/workflows/pre-commit.yaml jobs.main.steps[4]`
browser-use/browser-use	`codespell`	pre-commit, ci	`.github/workflows/lint.yml jobs.lint-style.steps[4]`
apache/airflow	`codespell`	pre-commit	`.pre-commit-config.yaml hooks.codespell`
gofiber/fiber	`codespell`	ci	`.github/workflows/spell-check.yml jobs.cspell.steps[4] (Run codespell)`
Aider-AI/aider	`codespell`	pre-commit, ci	`.github/workflows/pre-commit.yml jobs.pre-commit.steps[4] (Run pre-commit hooks)`
openai/codex	`codespell`	ci	`.github/workflows/codespell.yml jobs.codespell.steps[2] (Codespell)`
celery/celery	`codespell`	pre-commit, ci	`.github/workflows/linter.yml jobs.linter.steps[1] (Run pre-commit)`
pydantic/pydantic	`codespell`	pre-commit, ci, local	`.github/workflows/ci.yml jobs.lint.steps[3]`
jj-vcs/jj	`codespell`	ci	`.github/workflows/ci.yml jobs.check-codespell.steps[3] (Run Codespell)`
sgl-project/sglang	`codespell`	pre-commit, ci	`.github/workflows/lint.yml jobs.lint.steps[6] (Run pre-commit checks)`
oraios/serena	`codespell`	ci	`.github/workflows/codespell.yml jobs.codespell.steps[2] (Codespell)`
langfuse/langfuse	`codespell`	ci	`.github/workflows/codespell.yml jobs.codespell.steps[1] (Codespell)`
bytedance/trae-agent	`codespell`	pre-commit, ci, local	`.github/workflows/pre-commit.yml jobs.pre-commit.steps[4] (Run pre-commit hooks)`
bytedance/sonic	`codespell`	ci	`.github/workflows/lint.yml jobs.misc.steps[1] (spell check)`
LMCache/LMCache	`codespell`	pre-commit, ci	`.github/workflows/code_quality_checks.yml jobs.pre-commit.steps[4] (Run code ...`
open-telemetry/opentelemetry-python	`codespell`	ci, local	`.github/workflows/misc.yml jobs.spellcheck.steps[3] (Run tests)`