Replay Fixtures
Snapshot any run into an immutable artifact. Reproduce exact failures with the same seeds and payloads, weeks later.
Reliability Pack
Catch agent failures
before production.
Deterministic MCP test scenarios for regression testing AI agents. Run suites, publish replay fixtures, gate CI with assertions, and verify protocol behavior — all from a single endpoint.
Endpoint
/mcp4Fake Services
5Scenario Types
8Assertion Ops
2Conformance Profiles
Core Features
Assertions
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 when error-severity assertions trip.
Conformance + Stateful
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.
Included Scenarios
Rate Limited
Auth Expired
Partial Outage
Malformed Payload
Slow Response
Quickstart
# Install and start the local MCP server$ pnpm install$ pnpm --filter @fakemcp/mcp dev # Run an inline reliability suite$ curl -X POST http://127.0.0.1:8787/v1/runs \ -H "Content-Type: application/json" \ -d '{"source":"ci","cases":[{"server":"github","scenario":"rate_limit"}]}' # Export JUnit report for CI$ curl http://127.0.0.1:8787/v1/runs/<runId>/report?format=junit
Guides