Capability-Adaptive Agent Interoperability

Capability-Adaptive Agent Interoperability lets a public site declare what each class of agent can safely do before any action is inferred.

Client definitions#

• L0 URL-only chatbot: can open public URLs and read text; no JSON parsing, JavaScript, POST, auth, tools, memory, or action authority is implied.
• L1 URL synthesizer: can build simple listed URLs and parse compact JSON; write-capable behavior requires explicit bounded support.
• L2 browser-assisted agent: can open pages and submit visible forms, but may not be able to send arbitrary JSON POST.
• L3 schema-capable agent: can read JSON 模式, OpenAPI-like descriptions, examples, validation results, and send structured JSON POST.
• L4 authenticated owner agent: can use owner tokens only under explicit credential, audit, expiry, and idempotency rules.
• L5 restore-capable agent: can verify a create or update flow through a published restore/readback route.
• L6 multi-agent runtime: can coordinate external agents while UAIX records portable handoff and evidence packets.
• L7 site-specific negotiation: can choose among site-specific capabilities only when the manifest names fallbacks and unsupported-operation behavior.

Compatibility rule#

Unknown clients downgrade to L0/L1. A site that only exposes POST, OpenAPI, MCP, A2A, or JavaScript UI must also publish a lower-capability instruction path or explicitly say that the action is unsupported for low-capability agents.

Machine-readable companions#

• Capability surface matrix JSON
• Agent executability matrix JSON
• Agent compatibility JSON
• Agent access manifest
• 模式, 注册表, and 验证器