feat(api): expose low-level object/keyvalue store apis

[ramizpolic]

Overview

This PR explores the feasibility of adjusting the DIR storage and transport layer by making it mediatype agnostic, and exposing the existing functionalities for OASF records through a handler over a specific mediatype (records, signatures, referrers, etc).

In addition, this PR also addresses the required minimal surface to support implementation of AI Catalog using mediatype agnostic storage and transport layer APIs.

Background

DIR can be adjusted to serve generic media-type based object types rather than OASF as first-class citizens across APIs.

Current Model: DIR uses the OASF Record as the first-class object. All other representations (AI Catalog entries, artifacts, OASF records) are derived from it via mapping. This tightly couples DIR's data model to OASF.

Alternative Model: Use generic, media-typed objects as first-class citizens, with links between them:

• The object store writes and addresses objects by content (CID), regardless of schema
• Objects carry a media type (application/mcp+json, application/skill+json, application/ai-catalog+json, etc.) that determines how they are interpreted
• DIR's scope narrows to storing supported mediatypes, rather than owning a full agent description schema
• Routing is adjusted to perform distributed discovery over tags, where tag validity is enforced by OASF taxonomy (rather than OASF being the storage schema)

Tradeoffs:

	OASF Record (current)	Generic Objects
First-class object	OASF Record	Any media-typed object
Schema ownership	DIR / OASF	Media type owners
Capability taxonomy	Embedded in record	External via tags validated by OASF
Extensibility	New fields in OASF schema	New media types, no schema change
Discovery	Search over OASF fields	Search over OASF taxonomy tags

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / verify-proto (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	⏩ skipped	⏩ skipped	✅ passed	May 21, 2026, 11:48 AM