Agent-to-agent interoperability
Make a handoff mean the same thing on both sides.
Agents that exchange messages still need shared expectations about task meaning, authority, state and failure. Examine the contract around the conversation before relying on cross-system work.
Make a handoff mean the same thing on both sides
- Capability description
- Defines the work a receiving agent claims it can accept.
- Delegation contract
- Carries task meaning, limits and completion expectations.
- Identity propagation
- Preserves the principal and authority through the handoff.
- Failure ownership
- Assigns responsibility for timeout, cancellation and partial work.
Discipline model
Transport compatibility leaves semantic questions open
The relationships that define the discipline
- Capability description
- Discovery describes an offered capability before a task is delegated.
- Delegation contract
- The contract turns that description into acceptance and completion conditions.
- Identity propagation
- Authority must survive the handoff without expanding beyond its mandate.
- Failure ownership
- A partial result needs an owner even when the message exchange stops.
Interoperability includes more than successful transport. A sender and receiver may parse the same message while disagreeing about acceptance, completion, cancellation or responsibility for an external action. Separate protocol compatibility from workflow semantics and trust. Versioned contracts make those differences inspectable before an integration becomes operationally important.
Working artefact
Compare the same handoff dimensions
Illustrative working record
Illustrative working format
- Capability description
- Define the subject and the requirement the record addresses.
- Evidence reference
- Link source, version and observed condition without copying sensitive material.
- Identity propagation
- Explain the finding or choice and its consequence.
- Failure ownership
- Assign the next action and state what remains unresolved.
A compatibility record should compare a shared dimension across the selected implementations: message semantics, authority handling, error response or task state. Keep evidence tied to the tested versions and configuration. An integration recommendation then states the missing adapter, contract change or operational responsibility rather than merely labelling two products compatible.
Illustrative situation
An acknowledgement may leave completion uncertain
A constructed situation to reason through
Illustrative scenario
- Task accepted
A receiving agent acknowledges a requested record update.
- Connection breaks
The sender cannot tell whether the update completed.
- Handoff decision
Inspect task state before retrying or assigning recovery.
Use this situation to identify the evidence that would change the decision. The proposed examination must stay within the agreed scope, and any conclusion must describe the conditions actually inspected.
Working approach
Test the contract when the happy path breaks
Proposed investigation sequence
- Define capability description
State the decision and conditions the work must address.
- Map delegation contract
Connect the relevant actors, configuration and evidence.
- Examine identity propagation
Use agreed evidence and controlled cases where appropriate.
- Review failure ownership
Record limits, ownership and the condition for a next decision.
Start with one cross-agent task and describe both sides of the contract. Compare supported messages, schemas, identity handling and lifecycle states. Exercise incompatible versions, rejected tasks, delayed acknowledgements and partial completion in an agreed environment. Check whether retries preserve task identity and whether the receiving agent can exceed the delegated scope.
Scope and next decision
Compatibility does not establish trust or partnership
Prepare a bounded next discussion
- Capability description
- Bring one concrete workflow question and its accountable owner.
- Delegation contract
- Identify the evidence and access that can be made available.
- Identity propagation
- Agree the specialist involvement and responsibilities required.
- Written scope
- Confirm activities, evidence, readiness and acceptance before commitment.
Protocol support does not establish end-to-end reliability or trust. Vendor agreements, commercial partnerships and production support commitments are separate from technical compatibility. Any active test of a remote system requires the relevant authorisation.
Explore the discipline
Specialist areas within this capability
Choose a question to explore its methods, boundaries and indicative outputs.
- Agent interoperability assessment
- MCP architecture and security
- Agent2Agent protocol evaluation
- Agent protocol compatibility testing
- Cross-vendor agent integration
- Agent capability discovery design
- Delegation contract design
- Agent message-schema governance
- Protocol authentication review
- Protocol authorisation review
- Trust negotiation between agents
- Cross-agent identity propagation
- Agent communication privacy
- Protocol conformance testing
- Agent discovery security
- Semantic interoperability assessment
- Multi-agent transaction integrity
- Agent protocol gateway engineering
- Interoperability test-suite development
- Vendor-neutral agent architecture
Related services
AI Agent Protocol Interoperability Lab
Find where connected agents disagree. Exercise message contracts, identity propagation and failure recovery across your selected integrations.
Relevant insights
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Agent protocols are creating a new control surface
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