The Tool Desk
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Why are there so many agent protocols?
“Interoperability” can mean several things. An agent might need to call a database, find another agent with a needed capability, hand off a task, or return an artifact from that task. Those are different interfaces and trust boundaries, so one protocol need not handle all of them.
A practical example: a research agent uses a tool-facing interface to query a document store, then delegates a translation task to an agent built by another team. The first connection is agent-to-tool/context; the second is agent-to-agent coordination. The official A2A documentation describes MCP as addressing the first layer and A2A as addressing the second, and calls them complementary (A2A v1.0 documentation). That is a useful architecture model, not a requirement to use both protocols in every product.
How do MCP, ACP, A2A, and ANP differ?
| Protocol | Primary task and interaction shape | Discovery and identity | Maturity and compatibility | Governance context |
|---|---|---|---|---|
| MCP | Connects an agent to tools, APIs, and resources. The A2A documentation characterizes it as the agent-to-tool/context layer; the May 2025 survey describes a JSON-RPC client-server interface. | Not stated here as a cross-agent discovery mechanism; consult the relevant MCP specification for the details of a particular implementation. | Not stated in the sources cited here. Check the current specification and the client/server versions you plan to deploy. | Not stated in the sources cited here. |
| A2A | Supports communication and collaboration between agents, including task-oriented exchanges. The v1.0 materials describe polling, streaming, and webhooks for task updates. | Agent Cards advertise agent capabilities. The v1.0 release materials include signed Agent Cards; implementation requirements belong to the versioned specification. | Version 1.0 was announced as the first stable release on March 12, 2026. It changes interaction behavior from v0.3, so check version negotiation and migration support. | The Linux Foundation described A2A as a hosted project in April 2026. An August 17, 2026 Axios report said it was moving to the Agentic AI Foundation; the available evidence does not confirm that transfer through a primary announcement. |
| ACP | In a May 4, 2025 survey, ACP is described as REST-native messaging with multipart messages and asynchronous streaming. | Not stated in the cited survey description. | That survey is historical context, not evidence of ACP’s current independent status. The A2A v1.0 documentation says IBM ACP was incorporated into A2A. | Not stated in the cited survey. Its relationship to A2A has since changed, according to the A2A documentation. |
| ANP | In the May 4, 2025 survey, ANP is described as supporting decentralized discovery and collaboration. | The survey describes use of decentralized identifiers and JSON-LD. | Not stated in the cited survey as a current stable version or compatibility position. | Not stated in the cited survey. |
The ACP and ANP descriptions in this table come from a survey published May 4, 2025, not from current status pages (survey of agent interoperability protocols). A2A’s documentation says IBM ACP was incorporated into A2A, so ACP is important to the history of the landscape but should not be presented as an equally independent current standard on this evidence.
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What does A2A add beyond a tool call?
A tool call usually asks a specific service to perform an operation or return data. A2A is designed for an exchange in which one agent can discover another agent’s advertised capabilities, send it work, and receive progress or results. The launch-era Google explanation describes JSON Agent Cards, task lifecycles, messages, artifacts, and negotiation of user experience (Google’s original A2A announcement). Treat that post as an introduction to the design; use the versioned v1.0 documentation for implementation requirements.
Capability discovery is not a guarantee of suitability
An Agent Card can advertise what an agent says it can do. A caller still needs to decide whether those advertised capabilities, authentication arrangements, data handling, and operational guarantees meet its needs. Discovery makes candidates findable; it does not certify their quality or trustworthiness.
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Tasks can outlast a single request
A2A’s v1.0 materials describe task updates through polling, streaming, or webhooks. That matters when a delegated job may take longer than a normal request-response call: the caller needs a way to track progress and receive outputs rather than assume the work finishes immediately.
What changed in A2A v1.0, and why should implementers care?
The A2A community announced v1.0 on March 12, 2026, calling it the first stable version. The release highlights multi-protocol bindings, version negotiation, multi-tenancy, signed Agent Cards, modernized security flows, and migration support (A2A v1.0 release announcement).
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The compatibility warning is especially practical: the announcement says v1.0 changes interaction protocol behavior and that earlier v0.3 behavior is not fully backward-compatible. Clients can negotiate versions, and Agent Cards can advertise support for both behaviors, but that does not remove the need to test the exact client, server, and SDK combination in use.
- Identify the versions in your deployment. Record the protocol version supported by each client and agent, not just the project name.
- Check negotiation behavior. Confirm how a client chooses among versions and what happens if the remote agent supports only an older interaction behavior.
- Test migration paths. Exercise both old and new interactions in a staging environment if your deployment needs to bridge v0.3 and v1.0.
- Verify SDK support and security requirements. Compare the actual SDK release and deployment configuration with the current versioned specification; a stable protocol release alone does not prove that a particular library implements every feature you need.
How should teams choose which protocol layer to adopt?
Start from the connection your system needs, not from the acronym receiving the most attention. Use an agent-to-tool/context interface when an agent needs access to a defined tool, API, or resource. Consider agent-to-agent coordination when it must hand work to a separately built agent and manage the resulting task. Add a discovery approach only if agents need to locate capabilities dynamically across an environment.
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- Define the boundary. Is the remote party a tool with a fixed operation, or another agent expected to interpret and carry out a task?
- Specify the interaction lifecycle. Decide whether a short request-response exchange is enough or whether you need progress updates, streaming, callbacks, or artifacts.
- Set discovery and identity requirements. Determine how capabilities are advertised, how the remote endpoint is found, and what checks establish that it is the intended endpoint.
- Map security responsibilities. Identify authentication and authorization requirements, data exposure, tenancy boundaries, and which controls are enforced by the protocol versus by your deployment.
- Check real compatibility. Verify protocol versions, SDK support, supported content types, migration behavior, and error handling across the products you will connect.
- Test the complete workflow. A standard defines an interface; it does not guarantee that two implementations interoperate correctly or that their operational policies match.
There is no independent comparative benchmark in the cited material for performance, security, implementation cost, or conformance across these protocols. Evaluate those properties in the context of your own requirements rather than inferring them from a protocol’s scope or popularity.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do adoption and governance claims tell us?
In an April 9, 2026 announcement, the Linux Foundation reported that more than 150 organizations supported A2A and cited platform integrations, production deployments, and five production-ready SDK languages (Linux Foundation announcement). This is a project-reported ecosystem figure as of that announcement, not independent evidence that 150 implementations passed conformance tests or that every pair of products interoperates.
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Governance is also time-sensitive. The Linux Foundation described A2A as a hosted project in April 2026, while Axios reported a move to the Agentic AI Foundation on August 17, 2026 (Axios report). Because the latter is a secondary report and the available sources do not confirm the transfer through a primary announcement, teams for whom stewardship matters should verify the current official project governance before making a dependency decision.
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