An Agent-Native Registry is a catalog published machine-readable first: every entry is structured data with provenance, consumers sync changes by date instead…
An Agent-Native Registry is a catalog published machine-readable first: every entry is structured data with provenance, consumers sync changes by date instead of re-scraping, and nothing unverified is presented as fact. The GTM Stacker Registry is a working implementation: 321 OSI-license-verified open-source GTM tools across 24 categories.
An Agent-Native Registry has four defining properties. A catalog missing any of them is a website with an API, not an agent-native property.
**1. Machine-readable first.** The structured surfaces are the primary product; the human HTML is generated from the same source. Discovery starts at llms.txt, and every entry exists as JSON, JSON-LD, and a clean Markdown twin at stable URLs. An agent never parses HTML to get a fact.
**2. Delta-syncable.** Consumers fetch only what changed. A date-partitioned index plus conditional HTTP requests replace re-crawling: a daily consumer of the GTM Stacker Registry reads one small index file and the day's entries, not a 332-entry catalog.
**3. Provenance on every entry.** Each entry states where its facts come from and when they were last verified. In the reference implementation, every one of the 321 tool entries carries an independently verified OSI license and a last_verified date pointing at the primary source.
**4. No fabrication.** Unverifiable fields are published as unknown, never guessed. A registry that invents a license or a price is optimizing for coverage at the cost of being citable; an agent-native one accepts honest gaps.
AI engines answer from text they can retrieve and trust. HTML built for browsers wastes the consumer's tokens and hides facts in layout; a submission-driven directory decays because nobody re-verifies old rows. The Agent-Native Registry inverts both: publish the structured fact first, regenerate the human view from it, and stamp every fact with its source and verification date.
The GTM Stacker Registry publishes its surfaces at gtmstacker.com: llms.txt at the root, JSON Feed and a by-date delta index under /registry/, and a Markdown twin beside every entry. The registry is an open-source generator with zero runtime dependencies; the catalog it emits is the proof of the definition.