R19.1: Function length limit

Short answer: Functions remain under 100 lines; extract complex branches. A long function has too many reasons to change and cannot be read at once.

Group: Clean code. Status: stable. Generated from the rule definitions; do not edit by hand.

Playground: https://brevio.pro/tools/agent-guard-playground?rule=R19.1

What it catches

Function length limit: functions remain under 100 lines; extract complex branches.

Why

A long function has too many reasons to change and cannot be read at once.

A bad example

def run():  # 300 lines

A good example

def run():
    plan = make_plan()
    return execute(plan)

How it is checked

Nothing yet. No scanner and no slice card checks it: it is a standing rule for authors and reviewers.

How to silence it

A person can silence one finding with brevio-core: ignore R19.1 -- reason on the line or the line above. Without the reason it does not count. An agent cannot silence it: the agent hook and the MCP tools never honour the comment, and a pull request that adds one is reported until a reviewer allows it. Fixing the code is still the better answer.

To change what the rule flags, edit its definition in dev_rules.py or code_rules/__init__.py. That is a code change and is reviewed like one.

R19.2 Cyclomatic complexity bounding
R19.3 No dead commented-out code
R19.4 Descriptive variable naming
Every rule