The A2A (Agent2Agent) protocol announced by Google Cloud in April 2025 is the most credible 2026 candidate for an open standard for cross-vendor agent-to-agent interoperability, with backing from 50+ partners across the enterprise software ecosystem (Salesforce, SAP, ServiceNow, MongoDB, Atlassian, and others). The protocol layer covers what MCP (Model Context Protocol) does not: MCP is for agent-to-tool communication, A2A is for agent-to-agent communication. The two protocols are designed to be complementary rather than competing. A2A's adoption trajectory through 2026 will determine whether broker-mediated multi-agent patterns become the cross-vendor default; current trajectory points to deployment-grade stability in the second half of 2026, with widespread enterprise adoption following in 2027. Enterprises selecting agent platforms in 2026 should require A2A roadmap commitments from any vendor whose product will participate in cross-vendor agent workflows.
A2A protocol piece. 60-day review cadence given active protocol evolution. Watches: (1) A2A specification version updates and reference implementation maturity, (2) inflection in vendor support beyond the announcement-day partner set (e.g., Anthropic and Microsoft have not committed to A2A as of April 2026; their positioning may shift), (3) competing or parallel standards (Microsoft has hinted at alternative inter-agent primitives in their Copilot platform; Anthropic has internal context-isolation primitives that may or may not converge on A2A), (4) regulatory positioning (the EU AI Act's Article 9 risk-management requirements may begin to reference A2A or equivalent in 2026-2027 enforcement guidance).
/holding/AM-050/Embed this claimiframe + oEmbed
The card auto-updates when the claim's status, last-reviewed date, or correction log changes. Embedders never need to refresh — the card is rendered live from the canonical record.
About this register
The Reporting register tracks claims published from articles addressed to senior enterprise IT leaders — CIOs, IT directors, heads of platform. Claims are reviewed on a 30–90 day cadence; each review either reaffirms the claim, marks one substantive part as Partial, or marks it Not holding once the underlying evidence has been overtaken.
Recent corrections in Reporting
- AM-002 · Not holding · 06 May 2026
URL state changed. The /the-agentic-ai-revolution-real-world-success-stories-and-strategic-insights-from-2024-2025/ slug now serves a deliberately rewritten retrospective (claimId AM-130, "Agentic AI 2024-2025 retrospective", published 04 May 2026) against audited primary sources. The 28 Apr 2026 redirect to /retractions/ has been lifted to allow that. AM-002 the claim remains Not holding — the original $3.50/dollar + 70% failure-rate framing was withdrawn and is not restored. AM-130 is a separate claim with its own evidence chain. Readers arriving at /holding/AM-002 see the withdrawal here; the article link surfaces the new piece at the URL the original lived at, with this entry as the audit trail.
- AM-121 · Holding · 2 May 2026
Klarna walk-back primary-source upgrade — added Siemiatkowski verbatim quotes via Bloomberg-cited-by-Fortune (9 May 2025) and the Uber-style freelance hiring detail via Entrepreneur. Closes the highest-priority evidence gap from the source dossier.
- AM-115 · Holding · 29 Apr 2026
Initial publication 29 Apr 2026 — the first Quarterly Claim Review Bulletin. The claim itself is recursive: it asserts that the bulletin will ship quarterly, and the next review (30 Jul 2026) tests whether the Q3 bulletin actually appeared. Status starts as 'up' because the claim is currently true (the Q2 bulletin shipped). The verdict at end of July 2026 will move to Holding, Partial (bulletin shipped but on a delayed cadence), or Not holding (no bulletin shipped). REVIEW: Peter — please verify claim text + cadence wording before removing rewriteInProgress flag.
Reviews coming up in Reporting
- AM-003 · Holding · next +5d (19 May 2026)
GPT-5 Pro's tiered-subscription model forces enterprises to classify problems by computational difficulty — $200/month…
- AM-136 · Holding · next +21d (4 Jun 2026)
Across the 24-month window May 2024 to April 2026, every major foundation-model provider (Anthropic, OpenAI, Google, AW…
- AM-020 · Holding · next +35d (18 Jun 2026)
The 40-60% TCO underestimate on enterprise agentic-AI deployments is not a cost-visibility failure — it is a cross-depa…