Agent 365 vs Agentspace vs Bedrock AgentCore (2026)

Three vendors now want to be the registry of record for every AI agent you run. We compare Agent 365, Agentspace, and Bedrock AgentCore on the one question that decides the architecture: whose registry is the source of truth.

Agent 365 vs Agentspace vs Bedrock AgentCore: which agent control plane is the source of truth?

In the agent 365 vs Agentspace vs Bedrock AgentCore decision, there is no single “best” control plane; there is only the registry that should be your source of truth. Microsoft Agent 365 is the strongest cross-cloud inventory and the cheapest per-seat governance layer, Google’s Gemini Enterprise Agent Platform (formerly Agentspace) is the best fit if your agents already run on Vertex, and AWS Bedrock AgentCore is the only framework-agnostic, usage-billed option with no seat tax. Pick based on where your human identities already live, because that is where your agent identities should live too.

Every other comparison on the web in 2026 gets this wrong by framing it as a two-cloud fight (Agent 365 vs AgentCore) or by comparing the wrong layer (Vertex vs Foundry vs AgentCore runtimes). The runtime is not the decision. The decision is the governance and control-plane layer: which system holds the canonical list of every agent, who its sponsor is, what it can touch, and how it dies. That registry is the new privileged-access boundary, and choosing it wrong means two competing systems of record and a non-human identity sprawl problem you cannot audit.

This is the first clean three-way buyer guide that treats “whose registry is the source of truth” as the actual purchase. We cover the registry model, the cross-cloud sync direction, the identity layer (Entra Agent ID vs Gemini’s Agent Registry vs AgentCore Identity), credential handling, unmanaged-agent blocking, and real 2026 pricing. If you want the upstream context first, read our explainers on what an agent control plane is and on non-human identity governance, then come back for the head-to-head.

Enterprise AI agent control plane comparison 2026: the full table

Across the seven dimensions that decide a control-plane purchase, the three vendors split cleanly: Agent 365 wins cross-cloud inventory and per-seat simplicity, AgentCore wins framework freedom and pure usage billing, and Gemini Enterprise wins if you are already a Vertex/Workspace shop. No vendor wins all seven, which is exactly why this is an architecture decision and not a feature checklist. The table below is the enterprise AI agent control plane comparison for 2026, built from each vendor’s own 2026 documentation and GA facts.

Read the table as a set of trade-offs, not a scoreboard. The registry model row tells you what gets cataloged. The sync-direction row tells you which way agents flow between clouds, and it is the single most misunderstood column in every other comparison. The credential row is where your real breach blast radius is decided. Pricing is last on purpose: at enterprise scale, the identity model costs more in operational risk than the per-seat fee ever will.

Whose registry should be the source of truth across clouds?

Make the registry of record live in whichever cloud already holds your human identity directory, then treat the other two clouds as enforcement edges, not systems of record. If your humans live in Entra, Agent 365 is your source of truth and it can mirror Bedrock and Gemini agents into one inventory. If they live in AWS IAM, AgentCore is your control plane. If they live in Google Cloud Identity, Gemini Enterprise’s Agent Registry is the catalog. The agent registry cross-cloud sync story in 2026 only flows in one practical direction today, and getting that direction wrong is the most expensive mistake in this space.

Here is the direction that matters: Agent 365 imports agents FROM AWS Bedrock and Google Gemini Enterprise into its own inventory, per Microsoft’s GA materials. The other two do not pull from Azure. That makes Agent 365 the only product that can act as a true cross-cloud aggregator out of the box, while AgentCore and Gemini each govern their own house. So if your real requirement is one pane of glass across three clouds, Microsoft is the only first-party answer in 2026, and that is a genuine reason to make it the source of truth even in an AWS-heavy shop.

But aggregation is not control. When Agent 365 mirrors a Bedrock agent, the runtime, the token vault, and the off switch still live in AWS. You get inventory and policy intent in Entra; you get enforcement in the host cloud. That is why the durable pattern is federation: one registry for the canonical list and policy decisions, native enforcement in each cloud. Use the decision tree below to pick your anchor.

Entra Agent ID vs AgentCore Identity: how the identity layer differs

Entra Agent ID and AgentCore Identity solve the same problem – giving an agent a governable identity – with opposite philosophies. Entra Agent ID makes the agent a first-class directory citizen subject to Conditional Access, Identity Protection risk signals, and time-boxed access packages with a human sponsor. AgentCore Identity treats the agent as a workload whose secrets live in a managed token vault that auto-rotates OAuth refresh tokens so the agent never holds a raw credential. This Entra Agent ID vs AgentCore Identity split is the most important technical fork in the whole comparison.

Microsoft’s model, GA since April 2026, introduces four new directory object types – agent identity blueprint, blueprint principal, agent identity, and agent user – so an agent can be enrolled, sponsored, governed, and de-provisioned exactly like an employee. A human sponsor is always accountable, sponsorship auto-transfers to a manager when that person leaves, and access packages expire on a schedule. The security features layer on top: Conditional Access for agents needs Entra ID P1, ID Protection for agents needs P2, and network-layer controls ride on Entra Internet Access. The mental model is HR for agents.

AWS takes a secrets-engineering view. AgentCore Identity issues workload identities and stores resource credentials and OAuth tokens in an encrypted token vault keyed by KMS. When a refresh token exists, AgentCore uses it to mint new access tokens automatically, so the agent code never sees long-lived secrets and you shrink the blast radius of a compromised agent process. Google’s Gemini Enterprise sits between the two: the Agent Registry binds agents to Google Cloud IAM roles and auth managers rather than minting a new identity primitive. If your threat model is leaked agent credentials, AgentCore’s vault is the cleanest. If it is ungoverned agent sprawl and accountability, Entra Agent ID’s directory model wins.

Microsoft Agent 365 vs AWS AgentCore: blocking unmanaged agents and pricing

In the Microsoft Agent 365 vs AWS AgentCore matchup, the two genuine differentiators are endpoint control and the billing model. Agent 365 can use Defender and Intune to surface and block unmanaged local AI agents on Windows endpoints – starting with the OpenClaw platform and with GitHub Copilot CLI and Claude Code on the roadmap – which neither AWS nor Google can do today. AgentCore counters with pure consumption pricing and zero seat tax, billing only for runtime, gateway, memory, and observability you actually use. These are not the same kind of capability, which is why the choice tracks your dominant risk.

The unmanaged-agent blocking is the sleeper feature of 2026. Shadow agents installed on employee laptops are the new shadow SaaS: an engineer pip-installs an autonomous coding agent, points it at production credentials, and your security team never sees it. Agent 365 surfaces those local agents through Defender and Intune and can quarantine them at the endpoint. Microsoft also shipped a Windows 365 for Agents Cloud PC class (public preview) that runs agentic workloads in a policy-controlled session separate from the user – a clean way to contain agents that need a desktop. No AWS or Google product blocks a rogue agent on a Windows laptop, because they govern cloud-hosted agents, not endpoints.

On cost, the models are not comparable on a single number, and you should be suspicious of any comparison that pretends they are. Agent 365 is $15 per user per month standalone, or bundled into the new Microsoft 365 E7 SKU at $99 per user per month, plus the agent’s own consumption. AgentCore charges per component – Runtime at roughly $0.0895 per vCPU-hour and $0.00945 per GB-hour, Gateway per tool invocation, Memory per event and retrieval, Observability uncapped pay-as-you-go – with no per-user fee at all. Gemini Enterprise is custom seat pricing (public reporting puts the entry band around $23-30 per user per month) plus agent compute. The pros and cons below cut through it.

Google Agentspace vs Agent 365: when does the Gemini path win?

Google Agentspace (now the Gemini Enterprise Agent Platform) beats Agent 365 in exactly one scenario: when your agents are already built on Vertex AI and your identity center of gravity is Google Cloud Identity or Workspace. In that case its Agent Registry – a single catalog of agents, tools, and MCP servers gated to approved, governed assets – is the natural source of truth, and bolting on Agent 365 would create two competing registries. Outside that scenario, Agent 365’s cross-cloud import and endpoint controls make it the stronger aggregator in the Google Agentspace vs Agent 365 comparison.

Gemini Enterprise’s strengths are real where they apply. The Agent Registry indexes not just agents but tools and MCP servers, which is the most MCP-native catalog of the three. It is A2A- and open-protocol oriented, so cross-vendor agent interoperability is a first-class design goal rather than a bolt-on. And it inherits Google Cloud IAM, so if your platform team already manages access through IAM roles, agents slot into the same model with auth-manager bindings instead of a new identity primitive to learn.

The weakness is the inverse of Microsoft’s strength: Gemini Enterprise does not pull agents from Azure or AWS, and it cannot block a rogue agent on a Windows laptop. So a Google shop that is purely Google can make Gemini Enterprise its clean source of truth, but a mixed-cloud enterprise that wants one inventory across all three will find that Agent 365 is the only product that mirrors the other two clouds inward. The honest verdict: anchor on Google only if you are a Google-first organization, and federate the others up to Agent 365 if you genuinely need a single cross-cloud pane.

The verdict: best agent control plane for each enterprise in 2026

For most mixed-cloud enterprises in 2026, Microsoft Agent 365 is the best default source-of-truth registry because it is the only one that imports agents from the other two clouds, the only one that blocks unmanaged agents on endpoints, and the cheapest predictable per-seat governance at $15/user/month. Choose AWS Bedrock AgentCore if you run open-source frameworks and want pure usage billing, and choose Google’s Gemini Enterprise Agent Platform if you are already Vertex- and Workspace-native. The right answer is whichever one matches where your human identities already live – then federate the rest.

The trap to avoid is believing any vendor’s pitch that one registry can rule all clouds today. Cross-cloud sync in 2026 is inventory discovery, not unified control – the runtime, the credentials, and the kill switch stay in the host cloud. Build for federation now (one registry for the canonical list and policy intent, native enforcement everywhere else) and you will survive the inevitable shifts in sync direction, the same way Google quietly folded Agentspace into Gemini Enterprise mid-cycle.

Builder’s take

I run agents across more than one cloud, and the 2026 control-plane race is really a fight over who holds the canonical list of your non-human identities. Having wired agent governance into Cyntr and Loomfeed, here is what I tell architects who ask me which of these to standardize on.

• Pick your source-of-truth registry by where your humans already live. If your identity center of gravity is Entra, Agent 365 is the cheapest path to one inventory because it can pull Bedrock and Gemini agents into a single pane. If it is AWS, AgentCore’s per-component model is the only one that bills purely on usage with no seat tax.
• Cross-cloud sync in 2026 is discovery, not control. Agent 365 can import and surface a Bedrock or Gemini agent, but the runtime, credentials, and kill switch still live in the cloud that hosts it. Treat the mirrored registry as an inventory, not a control plane, until A2A and ACP mature.
• The credential model is the real security differentiator, and it splits the field. AgentCore Identity vaults and rotates OAuth refresh tokens so the agent never holds raw secrets. Entra Agent ID makes the agent a first-class directory citizen with Conditional Access and access packages. Google leans on IAM and its Agent Registry. Buy the one whose model matches your existing blast-radius assumptions.
• The sleeper feature is Defender plus Intune blocking unmanaged local agents on Windows endpoints. Shadow agents on laptops are the 2026 version of shadow SaaS, and only Microsoft can quarantine them at the endpoint today. If your risk is rogue desktop agents, that capability alone can justify the $15 seat.
• Do not let a vendor talk you into one registry to rule all clouds yet. Run a thin federation: one source-of-truth registry for inventory and policy intent, native enforcement in each cloud. That is the only design that survives a vendor changing its sync direction, which Google already did by folding Agentspace into Gemini Enterprise.

Frequently asked questions

Primary sources

• Microsoft Agent 365 Hits General Availability With Local AI Agent Controls — WinBuzzer
• Agent 365 will be generally available on May 1, 2026 — Microsoft Community Hub
• Governing Agent Identities – Microsoft Entra ID Governance — Microsoft Learn
• Conditional Access for Agent Identities in Microsoft Entra — Microsoft Learn
• Provide identity and credential management for agent applications with Amazon Bedrock AgentCore Identity — AWS Documentation
• Amazon Bedrock AgentCore Pricing — Amazon Web Services
• Agent Registry – Gemini Enterprise Agent Platform — Google Cloud Documentation
• Introducing Gemini Enterprise Agent Platform — Google Cloud Blog

Last updated: June 2, 2026. Related: Governance.