Omnicoach: Custom Domain & Code Style Linter

Lightweight, high-signal static analysis engine and command coach designed to enforce domain-specific code style rules, architectural boundaries, and test hygiene across Python and Rust codebases.

📦 Installation

Prebuilt binaries are published to PyPI:

uv tool install omnicoach   # or: pipx install omnicoach

From crates.io:

cargo install omnicoach --locked

Both install the omnicoach binary.

🚀 Quickstart

Scan the entire repository:

omnicoach code .   # or simply: omnicoach

Scan only modified lines/files (VCS aware):

omnicoach code --diff

Validate an intercepted workflow command:

omnicoach command --cmd "jj edit @"

Try omnicoach in the browser or call its WebAssembly request/response module directly at kajiih.github.io/omnicoach:

import { loadOmnicoach } from "https://kajiih.github.io/omnicoach/omnicoach.js";

const omni = await loadOmnicoach("https://kajiih.github.io/omnicoach/omnicoach_playground.wasm");
const result = omni.lint({ path: "tests/test_app.py", code: "import time\ndef test_a(): time.sleep(1)\n", config: "" });

To pin a release, load wasm/<tag>/omnicoach_playground.wasm instead.

⚙️ Configuration (.omnicoach.toml)

Create a .omnicoach.toml file at the root of your project workspace.

Framework Rule Design: Enforcement Modes

Every rule in Omnicoach is built on a unified enforcement framework:

• enforcement-mode = "ban" (default for most rules): Prohibits the pattern. Violations can only be bypassed using explicit # omni:ignore[rule] -- <reason> (or # omnicoach:ignore[rule] -- <reason>) directives.
• enforcement-mode = "require-explanation": Permits the pattern as long as it is accompanied by an adjacent or inline substantive explanatory comment.

You can configure enforcement mode globally or per-language for any code rule (suppression audits and command rules reject it):

[rules.type-cast]
enforcement-mode = "ban" # default: strictly banned

[rules.sleep-in-tests]
enforcement-mode = "require-explanation" # permitted only when documented with an explanation comment

# Language-specific mode overrides
[rules.single-letter-name.python]
enforcement-mode = "require-explanation"

Global Selection & File Scoping

# Select tags (topics, facet values such as `heuristic`, or languages) and rule names.
# A topic includes its subtopics: `testing` covers `test-timing`, `test-doubles`, ...
select = ["testing", "type-cast"]

# The nearest selector wins along a topic path, so `testing` rules stay on except the
# `test-doubles` ones. A rule name beats any tag.
ignore = ["test-doubles"]

# Per-file rule ignores using glob patterns, applied after `select` / `ignore`
[per-file-ignores]
"tests/**" = ["single-letter-name", "heuristic"]

Unknown labels, facet names (precision) and a selector in both select and ignore fail at config load. Run omnicoach --list-tags for the topic tree; facet definitions and selection rules are in docs/dev/tag_guide.md.

📋 Rules

omnicoach documents every rule and topic, code and command alike:

omnicoach --list-rules              # every rule, with its languages and summary
omnicoach --list-rules --tag testing # the rules `select = ["testing"]` would select
omnicoach --list-tags               # the topic tree: parents, synonyms, descriptions, scope notes
omnicoach --explain sleep-in-tests  # one rule: what it does, why, configuration, tags, status

--explain also reports whether the rule is on under the .omnicoach.toml of the current directory, and which selector decided it.

🔕 Suppressions

Suppression directives accept either omni: or omnicoach: and require explicit bracketed rule targets and a -- <reason> explanation:

Inline Suppression (omni:ignore / omnicoach:ignore)

task = asyncio.create_task(loop())  # omni:ignore [unstructured-task] -- top-level daemon lifecycle

let x = 1; // omni:ignore [single-letter-name] -- 2D vector coordinate

Preceding-Line Suppression (omni:ignore / omnicoach:ignore)

# omni:ignore [nested-function] -- factory requires localized closure
@dataclass
def make_handler():
    def helper(): pass
    return helper

File-Level Suppression (omni:disable-file / omnicoach:disable-file)

# omni:disable-file [nested-function, single-letter-name] -- generated schema

🤝 Contributing

To add a rule, follow docs/dev/adding_a_rule.md.