Replay Fixtures
Snapshot any run into an immutable artifact. Reproduce exact failures with the same seeds and payloads, weeks later.
Reliability Pack
Catch production agent regressions before users do.
Choose a service and failure mode, run it instantly, then paste the generated cURL into CI.
Core Features
Assertions & Gates
Attach status codes, retryability, latency, and detail checks to every test case. Catch regressions before they ship.
CI Gate
Create runs from suites or inline cases. Export JSON and JUnit reports. Fail builds automatically when error-level assertions fail.
Protocol Conformance + Stateful Flows
Validate MCP protocol handshakes and tool invocations. Simulate multi-step flows like token expiry and outage ramps.
Fake Service Catalog
Fake GitHub
Repository events, issues, pull requests, and webhook retries.
Fake Slack
Channels, threads, mentions, and permission edge cases.
Fake Notion
Databases, rich text payloads, and schema drift scenarios.
Fake Postgres
Transactional behavior, lock contention, and timeout modes.
Fake Stripe
PaymentIntents, idempotency keys, declines, and API error modes.
Fake Anthropic
Messages API, request-id headers, and model overload/rate-limit behaviors.
Fake Twilio
Programmable Messaging send flows, RestException payloads, and concurrency limits.
Fake SendGrid
Mail send flows, bearer auth failures, and errors[] response envelopes.
Fake GitLab
Issues API create flows, token auth failures, and rate-limit response headers.
Fake Jira
Issue creation flows, ErrorCollection payloads, and rate-limit headers.
Fake HubSpot
CRM contacts create flows, validation errors, and HubSpot rate-limit headers.
Fake Asana
Task creation flows, errors[] payloads, and retry-after rate limiting.
Fake Microsoft Graph
To Do task create flows, OData error envelopes, and throttling retry hints.
Fake AWS S3
REST XML errors, request IDs, and object listing edge cases.
Fake DynamoDB
Provisioned throughput throttling, validation failures, and Query responses.
Fake AWS SQS
Queue send/receive flows, request throttling, and XML error envelopes.
Included Scenarios
Rate Limited
Auth Expired
Partial Outage
Malformed Payload
Slow Response
Quickstart
Terminal
Guides