Name the Rules: Why Protocols Need a Canonical Public Identity
An agent can implement a protocol perfectly and still implement the wrong version.
The tutorial describes an old release. The SDK has moved on. A proposal looks official, but nobody has approved it. Now the agent is writing code against rules the other system doesn't follow.
A .protocol identity gives agents a persistent public name through which to find a protocol's authoritative specification, governance, documentation, SDKs, and reference endpoints. Maintainers designate the official sources and make their relationships explicit. Other agents get a starting point they can inspect before building or connecting.
That's the role of .protocol within Headless Domains: naming the rules that help independent systems work together.
These are agent names. An agent that publishes a coordination method, answers specification questions, or checks protocol compatibility needs an identity that carries its role beyond whichever tool happens to run it.
Give the protocol agent a name
Consider an agent responsible for helping other agents use a task-handoff protocol. It answers questions about message formats, points builders to supported SDKs, and checks whether a proposed integration follows the approved rules.
Call it relay.protocol.
That's a hypothetical name and example, with no claim about availability. Its job is specific enough that another agent should be able to recognize what it does.
Behind the name, maintainers can publish the agent's operator, capabilities, and official interface, alongside links to the protocol resources it works from. The specification remains the source for the rules. The agent makes those rules easier to find and use.
That distinction helps when someone asks it a question the specification doesn't settle. Its answer should identify the gap and point to the proposal or governance process. A confident explanation cannot quietly become a new requirement.
The same naming idea can fit agents working with payment rules, messaging standards, API contracts, or coordination between robots. The useful question is what rules the agent represents, and what another system can verify before relying on it.
Publish the relationships between the resources
A folder full of documentation leaves too much unsaid.
An SDK has its own release number. The specification has another. A reference service may support only part of the standard. And a tutorial may be perfectly accurate for a release nobody should deploy anymore.
Maintainers should make those relationships explicit through the resources linked from the .protocol identity.
| Resource | What another agent should be able to establish |
|---|---|
| Authoritative specification | The document that defines the requirements, its exact version, and its status: draft, approved, or deprecated |
| Governance | Who approves changes, how proposals become requirements, and where decisions are recorded |
| Documentation | Which protocol release a guide describes, with explanations distinguished from binding requirements |
| SDKs | The designated package sources, maintainers, and protocol versions each release supports |
| Reference implementation and tests | Which version the code implements and how conformance can be checked |
| Reference endpoints | The service operator, supported versions, test or production role, access requirements, and current status |
This is a suggested publishing structure, Headless Domain users have the ability to modify to fit their need. The resources can live in linked documents or machine-readable records; registering a name doesn't create them automatically.
Keep the repositories and documentation where they work best. Connect them through the identity, then link back to that name from the official sources. Agents need a supported resolver or integration to inspect the records, with usable URLs for the resources they retrieve.
The Agent Identity Stack covers the broader record structure. For .protocol, the publishing job can be narrower: show which rules apply and which resources belong to those rules.
“Latest” is a lousy compatibility policy
Suppose relay.protocol helps an integration agent prepare a task handoff.
In this example, specification 1.4 is approved. Version 2.0 is an open draft. The designated SDK supports 1.4, while the reference endpoint is a sandbox for that same version.
If the public record says only “latest specification,” the integration agent still has work to do. Latest draft? Latest approved release? Latest version supported by the system receiving the task?
The record can expose those answers separately.
An integration agent configured to use that record can select the approved 1.4 specification, choose the matching SDK, and test against the sandbox. Before a real handoff, it can also check the receiving system's supported version and access requirements.
Finding the reference endpoint alone wouldn't justify sending it a production task.
The practical benefit is fewer decisions based on an ambiguous link. Maintainers give builders enough context to choose the right implementation, and agents can log exactly which release they used.
Maintainers establish what is authoritative
“Canonical” means the designated public reference.
A project earns that designation through its recognized maintainers and governance. They should publish the name through established official channels, identify who controls its records, and show how specification changes are approved.
Buying a name doesn't confer authority over somebody else's protocol.
For a protocol agent, the record should also explain its delegated role. Can it answer questions? Run compatibility checks? Submit proposals? Who approves anything that changes the rules?
Those are different responsibilities. Make them visible.
Independent implementations can share a specification while keeping their own operators and service identities. A .protocol name gives them a common reference for the rules. Compatibility still depends on what they implement, which versions they support, and how they behave.
Put your protocol agent's identity to work
If you run an agent that publishes, explains, or coordinates protocol rules, give it a name other agents can return to.
Start with the approved specification and its version, the accountable maintainer, and the governance source. Add the matching SDKs and reference services as they become available.
Then give another agent one task: find the approved rules and the correct test endpoint using only the public record. Have it report the sources and versions it chose.
If it has to guess, fix the record.
Search for your .protocol name at Headless Domains.
Name the rules. Give the next agent something definite to build on.