feat: Unique identifier for an agent in Agent Card #1079
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Summary of Changes
Hello @kthota-g, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces a new, optional id field to the AgentCard structure, both in the gRPC protocol definition and its TypeScript representation. The primary goal is to provide a stable, universally unique identifier (UUID) for agents, allowing clients to consistently reference them regardless of version changes. This enhancement improves the reliability and consistency of agent identification within the system.
Highlights
- New
idfield for AgentCard: An optionalidfield has been introduced to theAgentCardmessage in the gRPC specification, designed to serve as a unique identifier for an agent. - UUID Validation: The new
idfield is strictly validated to ensure it adheres to the UUID format, leveragingbuf/validatefor this purpose. - TypeScript Interface Update: The corresponding
AgentCardTypeScript interface has been updated to include the optionalidproperty, along with JSDoc comments indicating its UUID format. - Backward Compatibility and Reliability: The
idfield is optional to maintain backward compatibility and is intended to provide a stable identifier for clients to reliably reference agents across different versions.
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Code Review
This pull request introduces a new optional id field to the AgentCard in both the protobuf and TypeScript definitions. This ID serves as a stable, unique identifier for an agent across its different versions. The changes are well-implemented, with validation for the UUID format in the protobuf definition and clear JSDoc annotations in the TypeScript type. My feedback includes a couple of minor suggestions to improve the comments to better reflect the stability and purpose of this new identifier, incorporating details from the pull request description. Overall, this is a great addition for client-side agent identification.
darrelmiller
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is it an RFC 9562 type? |
Effectively yes. In the registry of formats used in OpenAPI/JSON Schema RFC4122 is referenced https://spec.openapis.org/registry/format/uuid.html and RFC9562 replaces that. We should probably update the OpenAPI format registry. |
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This seems to have overlap with the concept of an agent identity. I worry there are problems if a "malicious agent" reuses the uuid of a "good agent". Things like DID's or SPIFFE's are useful for preventing impersonation and guaranteeing uniqueness. Should we be waiting for that instead of opening up to random unsecure ids? |
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I think @ToddSegal's point is correct. If we use globally unique names they should be secure. In that case an RFC 9562 type must be computed over a security envelope which provides content integrity. This could be achieved by taking the the whole content as security envelope. However this is in conflict with the requirement that the id should not change if the version is changed. The actual definition of id should be spelled out including examples of how to compute it. |
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The intent of the
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@ToddSegal @muscariello I worry about trying to attach any kind of security characteristics to this "id". An agent is a web resource (at least it was until we started talking about stdio :-) ). Consumers of the agent should be paying close attention to the AgentURL as the thing that ensures authenticity. We have an entire ecosystem of security capability built around HTTPS. I would really like to avoid reinventing that. As @kthota-g mentioned we have signatures to ensure that agent cards have not been tampered with. Maybe the solution is to pick a better name than "id" to provide a way to group agent versions together. |
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@darrelmiller I am ok with that. I was just asking if we can say how we compute it. It is based on hashing. If hashing is mis-computed you may get frequent collision. It might be just a reference or additional text. And I have no issue to call it id. My comment about secure naming is about integrity not provenance. |
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@muscariello |
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@kthota-g it was mentioned UUID to provide uniqueness. As by RFC 9562, I was thinking about UUID5 for naming things and not UUID4 which acts as a nonce. If it is a nonce and not a unique name it should be clarified. But from the description of the use case it looks like UUID5. UUID5 is good as it is reproducible. Above, I was describing a namespace as of RFC 9562 to do that. |
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Sorry for the confusion. My intent was to specify the I have update the description to reflect this. |
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@kthota-g Please rebase this to the latest version of the spec |
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chore: Auto-generate a2a.json from types.ts changes Update docstrings chore: Auto-generate a2a.json from types.ts changes fix linting error
kthota-g
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@holtskinner just rebased with main. |
Fixes #1014