A transparency log is an append-only record whose completeness and integrity anyone can verify — the technology behind Certificate Transparency, applied to agent actions.
Every entry is a leaf in a Merkle tree; the signed tree head commits to the whole history. From it you can produce an inclusion proof (this record is in the log) and a consistency proof (the log only ever grew — nothing was rewritten). No blockchain, no gas: the same non-repudiation that secures the web's TLS certificates, computed instantly.
When an autonomous agent acts on your behalf, "trust our dashboard" isn't evidence. A transparency log turns the audit trail into something a third party can verify without trusting you — essential for compliance and for disputes about what an agent did.
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