0101 / INPUT
Contract change
Start from a changed API contract in a pull request.
OpenAPI change Downstream API contract tracing for engineering teams
Know who
breaks before
you merge.
Impact Gate is an API change impact analysis tool being prepared for a private pilot. It reviews OpenAPI contract changes, traces connected downstream consumers, and surfaces evidence and uncertainty for engineering teams. It is warn-only: your team stays in control of merge decisions.
Private pilot in preparationWarn-only review; your team stays in control.
ILLUSTRATIVE · NOT LIVE
API CONTRACT CHANGEOpenAPI
User: {
−email: stringremoved
status: "active" | "suspended"
}
EXAMPLE VALUE PATHIllustrative only
- 01
User.emailchanged API field - 02
UserResponse.emailconsumer value - 03
ReceiptService.process()example service path - 04
sendReceipt()example downstream use
Consumer tracing is being prepared for a private pilot and should be reviewed with the limits of the connected codebase in mind. This diagram is an example path, not a result from a live repository analysis.
A review path, not a verdict engine
How the analysis operates
It reads an API contract diff, finds downstream callers in an indexed graph, traces consumer code, and surfaces the evidence for review.
0202 / CONNECTION
Consumer mapping
Connect the changed API surface to indexed downstream callers.
Connected codebase0303 / REVIEW
Evidence for review
Surface the trace and leave the decision with the engineering team.
Warn-only outputExplicit outcome states
Show what the evidence can—and can’t—say.
When tracing cannot establish an answer, the result remains visible as uncertain rather than being presented as a clean finding.
VERIFIED
Direct evidence
A connected code path directly uses the changed API value. Findings should link to the evidence that supports review.
EVIDENCE-LINKEDLIKELY
Inferred path
The available code connects the change to a consumer, but one or more steps rely on inference.
INFERRED CONNECTIONUNCERTAIN
Coverage gap
Dynamic behavior, missing source, or an unresolved boundary prevents a reliable conclusion.
ABSTAIN, DON'T GUESSNOT AFFECTED
No observed use
Available connected code does not show use of the changed field. This is limited to the code that was analyzed.
SCOPE-LIMITEDCurrent contract scope
Supported OpenAPI changes
The current site describes OpenAPI contract review. Other contract formats are not presented as available here.
OpenAPI contract reviewOther contract formats are not presented as available here.
Endpoint or path changes
Added, removed, or renamed routes that can change how consumers reach an API.
Request and response types
Schema changes that alter the shape consumers send or receive.
Required fields
New required inputs that existing callers may not provide.
Optionality changes
Fields becoming optional or required, changing the assumptions callers can make.
Field removal or rename
Removed or renamed fields that consumer code may still read.
Enum changes
Added, removed, or renamed contract values that need review in callers.
Nullability changes
Values changing between nullable and non-nullable states.
Format and constraints
Changes to formats, ranges, lengths, or other declared value constraints.
Parameter changes
Path, query, header, or cookie parameters that change a request contract.
Status changes
Documented response status changes that alter client handling.
Request body changes
Changed payload requirements or content types for submitted data.
Response body changes
Changed payload requirements or content types for returned data.
And many more Additional OpenAPI changes can be reviewed when they affect the contract assumptions of connected consumers.
Product boundaries
Honest limits are part of the design.
Impact Gate is being prepared for a private pilot. These boundaries describe the current product posture—not a guarantee of complete analysis.
What Impact Gate aims to do
- Reads API contract changes for review.
- Traces consumers in connected, indexed code.
- Surfaces evidence and uncertainty for engineers.
What Impact Gate does not claim
- Guarantee every consumer is known.
- Monitor production traffic or runtime behavior.
- Block or merge pull requests for your team.
Private pilot · In preparation
Bring a shared API question.
Impact Gate is being prepared for a small private pilot. Join the waitlist to hear when teams can try the review flow with their own connected services.
Warn-onlyNon-blocking by default. No merge control.
Private pilot updatesFor engineering teams
Frequently asked
Clear answers before the pilot.
What is available now, what is still being prepared, and where the boundaries are.
What is Impact Gate?
Impact Gate is an API change impact analysis tool being prepared for a private pilot. It reviews OpenAPI contract changes, traces consumers in connected code, and surfaces evidence and uncertainty for engineering teams. It is warn-only.
Is Impact Gate generally available?
No. Impact Gate is being prepared for a small private pilot. Join the waitlist for updates.
Will it block a pull request?
No. The current product posture is warn-only: it presents review information and leaves merge decisions with your team.
Which API contract formats does Impact Gate review?
The current site describes OpenAPI contract review. Other contract formats are not presented as available.
What happens if the analysis cannot resolve a path?
The result should remain uncertain when source coverage, dynamic behavior, or resolution limits prevent a clear conclusion.
Does the evidence example on this page come from a real repository?
No. The evidence path on this page is explicitly illustrative and is not a live customer finding.
Have another question? Ask us at info@impactgate.in