EXTENDED_ECOSYSTEM_MAPPING: AGENT INTEROPERABILITY PROTOCOL ECOSYSTEM

A2A

A source-qualified lifecycle governance mapping for Agent2Agent protocol ecosystems, focused on inter-agent communication versus lifecycle responsibility.
BACK_TO: EXTENDED ECOSYSTEMLENS: AGENTIC LIFECYCLE GOVERNANCEMETHOD: HARNESS ENGINEERING
MAPPING_PROPOSITION

When one agent hands work to another through A2A, can the receiving agent's result be accepted without losing the original responsibility boundary?

Independent agents discover one another, exchange a task, and return an artifact. The handoff must preserve delegation authority, artifact lineage, review state, and the right to dispute or remediate.

Decision artifactCross-agent handoff record: delegating role, receiving role, task scope, artifact lineage, return condition, and acceptance or dispute state.
INPUTS
  • Delegation authority and task scope
  • Agent identity and capability context
  • Artifacts, messages, and return conditions
OUTPUTS
  • Cross-agent responsibility chain
  • Artifact and message lineage
  • Acceptance, dispute, or remediation state
BOUNDARY_NOTE

Independent lifecycle governance lens.

This page is independent lifecycle governance analysis. It is not official A2A documentation, affiliation, protocol scoring, legal advice, certification, legal compliance proof, or procurement guidance.

These pages apply GAIC lifecycle governance concepts to extended ecosystems. They are not GAIC scored assessments, vendor rankings, procurement recommendations, certifications, legal compliance proof, official vendor documentation, or vendor affiliations.

Ecosystem context

A2A is treated here as an agent-to-agent communication protocol ecosystem. The governance mapping asks how discovery, delegation, task exchange, messages, artifacts, authorization, and acceptance remain tied to human or organizational responsibility.

R3F uses official A2A specification and project sources to establish A2A as an agent communication and interoperability protocol context. It does not treat A2A alone as lifecycle governance or compliance proof.

MAPPING_FOCUS

What this mapping follows.

Interoperability makes handoffs easier, but it can also make ownership ambiguous. The mapping follows the original delegating role across discovery, task exchange, artifact return, and acceptance. It does not treat an agent card, capability description, or successful response as authorization. The durable record is the cross-agent handoff: who delegated, what was in scope, what came back, and which role could accept, dispute, or reopen it. A reviewer should also preserve the protocol-level identity used for discovery, the task state transitions, and the artifact reference returned by the remote agent. Streaming updates, asynchronous completion, and retries can each change what a human thinks has been delivered. Recording those transitions lets the owner distinguish a capability advertisement from a performed action and a returned artifact from an accepted result. This is why the A2A mapping centers on handoff lineage rather than treating interoperability as a substitute for lifecycle responsibility.

Lifecycle governance questions

  1. What authority boundary governs consequential work?
  2. What evidence chain survives tool, model, agent, or runtime action?
  3. What accepted outcome state is defined, and who may accept it?
  4. How are rollback, remediation, dispute, and substitution handled?
  5. Which human or organizational role owns lifecycle responsibility?
  6. Which agent is authorized to delegate work to another agent?
  7. What artifact or message evidence supports review, dispute, remediation, and acceptance?

Failure modes to test

  • Discovery is treated as authorization to delegate consequential work
  • The returned artifact loses the original task and owner context
  • A receiving agent reports completion with no acceptance boundary

Evidence to retain

  • Delegating and receiving agent identity
  • Task scope and authorization
  • Artifact and message lineage
  • Return, acceptance, or dispute record

Related Missing Regulatory Objects

These concepts are governance lenses for the mapping. This page does not claim the ecosystem has or lacks a feature unless the statement is supported by an official source.

Authority BoundaryEvidence ChainAccepted OutcomeLifecycle Responsibility ObjectsSubstitution recordDispute objectRemediation closure

RCCS-M / ALCS relevance

RCCS-M is relevant as a governance-coverage lens for lifecycle responsibility objects. ALCS is relevant as a lifecycle-coherence lens across intent, authority, evidence, acceptance, dispute, remediation, and closure. This R3F mapping is author-analytical and source-qualified, not a GAIC-scored assessment.

Harness Engineering relevance

Harness Engineering is relevant because inter-agent communication needs boundaries for delegation, task scope, evidence capture, return conditions, review, and closure.

Protocol path

MPLP and A2A answer different lifecycle questions in this site architecture. A2A enables agent communication and interoperability; MPLP is one protocol path for lifecycle responsibility semantics around delegated work. MPLP is not required, exclusive, certified, regulator-approved, vendor-affiliated, or already an industry standard.

WHITE_PAPER_SOURCE_TRACEADJACENT

White paper source trace

A2A is treated as an adjacent ecosystem mapping for inter-agent communication and delegation, not a GAIC-scored system.

This page is adjacent to GAIC, not a GAIC-scored assessment. It uses MRO, RCCS-M, and ALCS as lifecycle governance lenses for an ecosystem context established by official sources.

Use the trace to ask how tool access, agent delegation, model/runtime substitution, evidence, accepted outcome, rollback, and remediation would survive across the workflow.

This mapping is source-qualified and non-GAIC-scored. It is not vendor documentation, vendor affiliation, product scoring, legal advice, certification, legal compliance proof, procurement guidance, or a claim that MPLP is required.

MRO-15: Substitution conformanceVendor, model, or runtime substitution as a lifecycle responsibility object.Chapter 6: Missing Regulatory ObjectsThe MRO object layer for authority, evidence, acceptance, substitution, and closure.ALCSLifecycle conformance lens across intent, authority, evidence, acceptance, and closure.Publication boundaryNon-legal, non-certification, non-ranking, and non-procurement boundary.
GAIC white paper hubGAIC-cited systemsMissing Regulatory ObjectsRCCS-MALCS

Sources and authority

  • Global AI Compliance White Paper 2026authored-researchAuthor research source for the lifecycle responsibility vocabulary used by this mapping. It is a public research edition, not a standard or certification.
  • A2A documentationofficial-primary-sourceOfficial A2A documentation reviewed. The public specification URL is generated from the project docs and may move.
  • A2A project GitHubofficial-primary-sourceOfficial A2A project repository reviewed.