tools/devshell/lib/is_invoked_by_agent.sh

#!/bin/bash
# Copyright 2026 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Helper function to check if the current environment appears to be invoked by an AI agent.
# Returns 0 if invoked by an agent, 1 otherwise.
is_invoked_by_agent() {
  # Find the directory where this script lives.
  # We assume it stays in the same directory as agents.txt.
  local script_dir
  script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
  local agents_file="${script_dir}/agents.txt"

  if [[ ! -f "$agents_file" ]]; then
    echo "Error: agents.txt not found at ${agents_file}" >&2
    return 1
  fi

  while IFS= read -r agent || [[ -n "$agent" ]]; do
    # Ignore empty lines and comments
    [[ -z "$agent" || "$agent" =~ ^# ]] && continue

    # Indirect expansion to check if the variable is set
    if [[ -n "${!agent}" ]]; then
      return 0
    fi
  done < "$agents_file"

  return 1
}