THINK: The user wants a Portuguese title for Google Discover. It needs to be:

1. Short: Concise, easy to read quickly.
2. Curious: Intriguing, makes people want to click.
3. About the original topic: "For Robotaxis, Safety Must Be Built In, Not Bolted On". This means safety (segurança) for robotaxis (robotáxis) must be intrinsic, not an afterthought. The core idea is "integrated safety".

Let’s brainstorm some ideas in Portuguese, keeping the core message and the "short & curious" requirement in mind.

Original nuance: "Built In, Not Bolted On" implies a fundamental, integrated design vs. an add-on.

Keywords:

• Robotáxis / Carros autônomos
• Segurança
• Essencial / Desde o início / Integrada / Fundamento
• Problema / Risco (implied if not built-in)

Drafts & Refinements:

1. Direct translation attempt (too long): Para robotáxis, a segurança deve ser construída, não adicionada. (Still long, not curious enough)
2. Focus on the "built-in" aspect:
   • Segurança dos robotáxis: comece certo. (Okay, but a bit plain)
   • Robotáxis: segurança não é opcional. (A bit generic, "built-in" is more specific than "not optional")
   • O segredo da segurança em robotáxis. (Curious, but loses the "built-in" vs "bolted on" contrast)
   • Segurança autônoma: o que é essencial? (Good, "essencial" captures "built-in")
   • Segurança dos robotáxis: o detalhe que ninguém vê. (Too vague, "detalhe" is not strong enough for safety)
   • Robotáxis: A segurança invisível. (Intriguing, but "invisível" could imply hidden flaws, not good)
   • A verdade sobre a segurança dos robotáxis. (A bit sensationalist, common clickbait)
   • Segurança para robotáxis: o que realmente importa? (Okay, but a question is less assertive)
   • Robotáxis seguros: comece pelo design. (Good, "design" implies built-in)
   • Segurança em robotáxis: é desde o início! (Direct, emphasizes the start)

Let’s try to make it more impactful and concise:

• "Built In" can be translated as "intrínseco," "integrado," "desde o projeto," "na essência."
• "Not Bolted On" implies "não um acessório," "não depois."

Consider a phrase that implies the consequence of not building it in. Or the importance of doing it right from the start.

• Robotáxis: A segurança começa no projeto. (This is good. "No projeto" implies "built-in" and "from the start." It’s short, direct, and implies a critical aspect often overlooked or added later.)
• Robotáxis: Segurança intrínseca? (A bit too technical with "intrínseca" for Discover, and the question mark makes it less direct)
• A segurança dos robotáxis: o que é essencial. (Good, "essencial" covers "built-in")
• Robotáxis: Segurança, ou nada. (Too dramatic, less informative)
• O erro fatal na segurança dos robotáxis. (Sensational, but loses the original nuance of how safety should be implemented)

Let’s revisit "Robotáxis: A segurança começa no projeto."

• Short? Yes.
• Curious? Yes, it implies there’s a specific way safety must start, which might not be obvious to everyone. It contrasts with an "afterthought" approach.
• Relevant? Yes, directly addresses the topic.

Another option focusing on the "essential" aspect:

• Robotáxis: Segurança é parte do DNA. (More metaphorical, good for curious, short) – "DNA" implies built-in.
• Robotáxis: Segurança, só se for de berço. (Colloquial, "de berço" means "from birth" – inherent. Could work.)

"A segurança começa no projeto" is very clear and directly addresses the core "built-in" concept. "Segurança é parte do DNA" is more evocative and curious.

Let’s compare:

1. Robotáxis: A segurança começa no projeto. (Clear, direct, less metaphorical, easy to understand.)
2. Robotáxis: Segurança é parte do DNA. (More intriguing, uses a metaphor, might resonate well.)

The original title has a slightly technical feel with "built in, not bolted on". "Começa no projeto" is a direct and professional way to say "built in from the start". "Parte do DNA" is also good, but "projeto" is more literal for engineering/design context.

For Discover, curiosity is key. "DNA" is a strong metaphor for something inherent.

Let’s try one more combination that captures the "integrated" idea concisely. "Built In" = "Integrada" / "Essencial" "Not Bolted On" = "Não um acessório"

• Robotáxis: Segurança, só se for integrada. (This is very direct and captures the essence well.)
  • Short? Yes.
  • Curious? Yes, it implies there are other ways safety is added, but only one is acceptable.
  • Relevant? Yes.

This feels very strong. "Só se for integrada" creates that contrast with something that isn’t integrated, implying it’s the only valid approach. It directly reflects "Built In, Not Bolted On."

Final check: "APENAS o texto do título final, sem introduções ou listas".

The chosen option: "Robotáxis: Segurança, só se for integrada."Robotáxis: Segurança, só se for integrada.