eventbridge-scheduler (parlel)

A zero-dependency, in-process fake of Amazon EventBridge Scheduler. Speaks the REST/JSON API.

Field	Value
Service	`eventbridge-scheduler`
Port	`4740`
Protocol	REST / JSON
Health	`GET /_parlel/health`
Reset	`POST /_parlel/reset`

Default connection

AWS_ENDPOINT_URL=http://127.0.0.1:4740
AWS_REGION=us-east-1
AWS_ACCESS_KEY_ID=parlel
AWS_SECRET_ACCESS_KEY=parlel

Supported operations

Operation	HTTP
CreateSchedule	`POST /schedules/{name}`
GetSchedule	`GET /schedules/{name}`
UpdateSchedule	`PUT /schedules/{name}`
DeleteSchedule	`DELETE /schedules/{name}`
ListSchedules	`GET /schedules`
CreateScheduleGroup	`POST /schedule-groups/{name}`
GetScheduleGroup	`GET /schedule-groups/{name}`
ListScheduleGroups	`GET /schedule-groups`
DeleteScheduleGroup	`DELETE /schedule-groups/{name}`

A default schedule group always exists and cannot be deleted. Use the groupName query parameter to place a schedule in a non-default group.

SDK example

import { SchedulerClient, CreateScheduleCommand } from "@aws-sdk/client-scheduler";

const sc = new SchedulerClient({
  endpoint: "http://127.0.0.1:4740",
  region: "us-east-1",
  credentials: { accessKeyId: "parlel", secretAccessKey: "parlel" },
});

await sc.send(new CreateScheduleCommand({
  Name: "nightly",
  ScheduleExpression: "rate(1 day)",
  FlexibleTimeWindow: { Mode: "OFF" },
  Target: {
    Arn: "arn:aws:lambda:us-east-1:000000000000:function:fn",
    RoleArn: "arn:aws:iam::000000000000:role/r",
  },
}));

Access via MCP / preview URL

Under the parlel pool, reach this service through the MCP gateway and the pool's preview URL.

Surface coverage

This emulator faithfully replicates the API surface most application code and agents exercise. Anything below the supported lines is either an intentional design choice for a fast, zero-cost local emulator (✓ By design) or a candidate for a future release (⟳ Roadmap) — never a silent inaccuracy.

Legend: ✅ fully supported · ◐ accepted (stored, not strictly enforced) · ✓ by design · ⟳ on the roadmap.

Area	Limitation
Triggering	Schedules are stored, never fired (no real cron/rate engine).
Targets	Target ARN validated for presence only; never invoked.
Time windows	`FlexibleTimeWindow` stored but not applied.
Pagination	`Schedules`/`ScheduleGroups` returned in full.

Configuration — `test.env`

Copy these into your test.env (used by the bridge sidecar flow). Tokens are Parlel's seeded test credentials — any non-empty value is accepted by the emulator, so you rarely need to change them. Swap in real credentials only when pointing at the live service in prod.env.

AWS_ACCESS_KEY_ID=parlel
AWS_SECRET_ACCESS_KEY=parlel
AWS_REGION=us-east-1
AWS_ENDPOINT_URL=http://parlel-bridge:4740