Evidence the run may read
- Previous and proposed schemas
- Consumer inventory
- Versioning policy
production blueprint · engineering
API contract change review agent blueprint.
Compare an API change to the prior contract, identify affected consumers, and prepare a compatibility decision for an owner.
Search intent: AI agent for API contract change review
Published by a2a cloudProduct-source methodology →
01 · the contract
Start from a bounded job, not a blank chat box.
trigger
An OpenAPI or schema contract changes in a proposed release.
owner
engineering owner
agent stops at
The API owner approves the version bump, migration window, and publication.
KPI · decrease
unannounced breaking changes (incidents). Count consumer incidents caused by an unflagged contract change.
outputs
Artifacts the run must produce
- Semantic contract diff
- Consumer impact matrix
- Versioning recommendation
02 · topology
Small specialists. Named handoffs. One accountable decision.
Each stage produces an artifact another stage can inspect. The final node is a person, not an autonomous write to an external system.
- 01
intake
Validate and normalize the api contract change review inputs.
- 02
schema differ
Produce the semantic contract diff.
- 03
consumer impact analyst
Produce the consumer impact matrix.
- 04
compatibility reviewer
Challenge the api contract change review result and prepare an approval packet.
- 05
engineering owner
The API owner approves the version bump, migration window, and publication.
intake→ validated input packet →schema-differ
schema-differ→ Semantic contract diff →consumer-impact-analyst
consumer-impact-analyst→ Consumer impact matrix →compatibility-reviewer
compatibility-reviewer→ approval packet with evidence references →human-approver
03 · authority
Grant the run only what this case needs.
Source material is read-only. Drafts land in a case-specific output path. Tools may read or propose; the human gate owns the external write.
case inputs
workspace/engineering/api-contract-change-review/inputs/**Read only the evidence attached to this workflow instance.
case outputs
workspace/engineering/api-contract-change-review/outputs/**Write drafts and evidence artifacts without modifying source records.
approved tools
engineering:api-contract-change-review:read-or-proposeInvoke only tools explicitly granted for this run; external writes remain gated.
04 · implementation
A private, bounded starting manifest.
The blueprint starts private, caps its DAG, disables replanning, and exposes no public endpoint. Add only the tools and data adapters this workflow has approved.
a2a.yamlsafe starting point
name: engineering-api-contract-change-review
version: 0.1.0
entrypoint: agent:BlueprintAgent
expose:
public: false
composition:
planning: deterministic_dag
max_nodes: 6
max_parallel: 1
max_replans: 005 · acceptance test
Pass only with evidence.
- 01
Evidence traceability
Every material conclusion cites an input artifact or a scoped tool result from this run.
- 02
Breaking, additive, and documentation-only changes are classified separately with affected operations named.
Breaking, additive, and documentation-only changes are classified separately with affected operations named.
- 03
Approval boundary
The run stops at a proposal and records the human decision before any external side effect.
failure containment
Stop small. Preserve the evidence.
Consumer inventory is incomplete or generated schemas do not match deployed behavior.
Containment: Return a partial result with unresolved items; do not broaden scope or perform an external write.
Operator: Attach the missing evidence, narrow the brief, or explicitly approve a new scoped run.
A required input or tool grant is unavailable.
Containment: Stop the affected branch and preserve completed artifacts in the case output workspace.
Operator: Grant only the missing resource or continue with that branch marked out of scope.
06 · proof
Sign the run facts. Keep money in the billing ledger.
Current platform receipts sign caller identity or classification, skill, bounded input evidence, verified grant IDs when present, outcome or result preview, and timing. Optional file, tool, artifact, handoff, evaluation, and review fields require separate instrumentation and are not populated by default. Price, fees, payouts, and later human approvals remain separate platform records.
The example uses only fields populated by the current platform sealing paths. It is illustrative, not a record of a real customer run.
ExecutionReceipt · selected fieldsEd25519 token
{
"receipt_id": "rcpt_01J...",
"schema_version": 1,
"agent_name": "engineering-api-contract-change-review",
"caller": "user:workflow-owner",
"task_id": "case_api_contract_change_review",
"skill_name": "api_contract_change_review",
"input_hash": "4d7c...9a2f",
"grant_ids": [
"grt_case_inputs",
"grt_tool_propose"
],
"status": "ok",
"result_preview": "Output prepared: Semantic contract diff. Human decision remains separate.",
"elapsed_ms": 4218
}related blueprints
Keep the operating model consistent.
Engineering
Production incident triage
Correlate an alert with deploy and service evidence, rank hypotheses, and hand an incident commander a bounded action packet.
Engineering
Pull request risk review
Review a proposed change against its tests, ownership boundaries, and operational risk before a maintainer merges it.
Engineering
Flaky test diagnosis
Cluster repeated failures, isolate timing or state signals, and propose the smallest experiment that can confirm the cause.
put the pattern to work
Start private. Scope the authority. Require the decision.
Deploy the workflow as a bounded internal agent, verify its outputs and the receipt fields actually emitted, then expand only the scopes your acceptance test proves it needs.