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Add AI indicator pre-commit guard
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Jennifer Wang committed
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#!/usr/bin/env bash
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# Block commits when staged files contain explicit AI usage indicators.
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# Mirrors the onboarding guidance so reviewers remain blinded to AI tooling.
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# Markdown (.md) files are explicitly scanned to prevent AI flag text in docs.
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set -euo pipefail
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declare -a PATTERNS=(
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"generated by cursor"
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"cursor ai"
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"cursor wrote this"
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"cursor suggestion"
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"generated by claude"
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"claude wrote this"
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"claude ai"
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"claude opus"
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"claude sonnet"
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"claude haiku"
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"claude code"
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"generated with claude code"
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"generated with \\[claude code\\]"
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"co-authored-by: claude"
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"noreply@anthropic\\.com"
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"generated by gemini"
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"gemini wrote this"
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"google gemini"
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"gemini ultra"
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"gemini pro"
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"gemini nano"
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"generated by bard"
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"bard wrote this"
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"google bard"
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"as an ai assistant"
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"as an ai"
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"ai assistant"
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"ai suggestion"
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"ai suggestions"
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"ai-generated"
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"ai generated"
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"ai-assisted"
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"ai assisted"
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"ai-powered"
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"ai powered"
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"powered by ai"
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"with ai assistance"
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"with the help of ai"
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"assisted by ai"
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"written with ai"
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"written by ai"
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"generated with ai"
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"generated via ai"
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"created with ai"
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"created by ai"
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"authored by ai"
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"co-authored by ai"
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"ai help"
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"ai helped"
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"ai copilot"
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"ai co-pilot"
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"chatgpt"
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"gpt-4"
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"gpt4"
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"gpt-3"
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"gpt3"
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"openai"
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"anthropic"
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"google ai"
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"google deepmind"
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"deepmind"
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"perplexity"
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"perplexity ai"
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"tabnine"
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"tabnine ai"
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"replit ghostwriter"
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"ghostwriter ai"
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"aws codewhisperer"
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"amazon codewhisperer"
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"code whisperer"
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"codewhisperer"
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"github copilot"
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"copilot"
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"amazon q"
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"amazon q developer"
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"meta ai"
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"deepseek"
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"phind"
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"blackbox ai"
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"magic ai"
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"ai model"
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"llm"
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"large language model"
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"language model"
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"\\[ai\\]"
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"\\[ai-generated\\]"
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"\\[cursor\\]"
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"\\[claude\\]"
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"\\[gemini\\]"
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"\\[copilot\\]"
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"\\[chatgpt\\]"
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"\\[llm\\]"
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)
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PATTERN_REGEX=$(printf '%s|' "${PATTERNS[@]}")
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PATTERN_REGEX=${PATTERN_REGEX%|}
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# Build a newline-separated list of binary file paths (bash 3.2 compatible)
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BINARY_PATHS=""
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while IFS=$'\t' read -r added deleted path; do
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[[ -z "${path:-}" ]] && continue
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if [[ "$path" == *" -> "* ]]; then
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path=${path##* -> }
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fi
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if [[ "$added" == "-" || "$deleted" == "-" ]]; then
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BINARY_PATHS="${BINARY_PATHS}${path}"$'\n'
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fi
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done < <(git diff --cached --numstat --diff-filter=ACMRT || true)
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report=""
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current_file=""
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last_report_file=""
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violations=0
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while IFS= read -r line; do
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case "$line" in
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"diff --git "*)
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current_file=""
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;;
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"+++ "*)
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current_file=${line#+++ }
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if [[ "$current_file" == b/* ]]; then
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current_file=${current_file#b/}
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elif [[ "$current_file" == a/* ]]; then
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current_file=${current_file#a/}
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fi
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if [[ "$current_file" == "/dev/null" ]]; then
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current_file=""
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fi
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;;
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"Binary files "*)
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current_file=""
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;;
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*)
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if [[ "$line" == +* && "$line" != "+++"* ]]; then
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[[ -z "$current_file" ]] && continue
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if [[ -n "$BINARY_PATHS" ]] && echo "$BINARY_PATHS" | grep -qxF "$current_file"; then
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continue
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fi
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content=${line:1}
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if [[ -n "$content" ]] && LC_ALL=C grep -qiE "$PATTERN_REGEX" <<<"$content"; then
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if [[ "$current_file" != "$last_report_file" ]]; then
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report+=$'\n'"• $current_file"
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last_report_file="$current_file"
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fi
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report+=$'\n'" ${line}"
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violations=1
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fi
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fi
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;;
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esac
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done < <(git diff --cached --diff-filter=ACMRT --unified=0 --no-color)
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if [[ $violations -eq 1 ]]; then
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cat >&2 <<EOF
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✖ Commit blocked: staged changes contain AI usage indicators in the current diff.
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Please remove or rephrase the highlighted additions before committing:$report
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EOF
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exit 1
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fi
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exit 0
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