Comparison

Alternative Frameworks

CMDx bundles structured logging, telemetry hooks, type coercion, middleware, and retry/fault primitives into a single package with a stdlib-only runtime footprint. The table below maps feature coverage across the common service-object gems — use it to pick based on what you actually need, not on marketing.

Feature	CMDx	Actor	Interactor	ActiveInteraction	LightService
Stdlib-only runtime deps	✅	❌	✅	❌	❌
Typed inputs	✅	✅	❌	✅	❌
Type coercion	✅	❌	❌	✅	❌
Input validation	✅	✅	❌	✅	❌
Built-in logging	✅	❌	❌	❌	✅
Telemetry hooks	✅	❌	❌	❌	❌
Middleware system	✅	❌	❌	❌	✅
Workflow execution	✅	✅	✅	✅	✅
Fault tolerance	✅	❌	❌	❌	❌
Lifecycle callbacks	✅	✅	✅	✅	✅

In the box:

• Observability — structured logging, telemetry events, and chain-aware result tracking, no extra instrumentation required.

• Per-execution timing — every Result carries duration (milliseconds) and is emitted on the :task_executed telemetry event, so attaching a metrics exporter is a few lines.

• Type system — 13 built-in coercers (primitives, dates, arrays, hashes, etc.) and 7 validators (absence, exclusion, format, inclusion, length, numeric, presence), both pluggable.

• Middleware — wrap the task lifecycle for auth, caching, telemetry, etc., without touching work.

• Retries and faults — declarative retry_on with configurable jitter, halt primitives (success! / skip! / fail!), and throw! for propagating peer failures.

• Pluggable parallelism — workflow groups can run tasks concurrently using registered executors (:threads, :fibers, or custom) and fold results with registered mergers (:last_write_wins, :deep_merge, :no_merge, or custom). See Workflows - Parallel Groups.

• Full telemetry surface — :task_started, :task_deprecated, :task_retried, :task_rolled_back, and :task_executed events are emitted only when subscribers exist; subscribe from a single CMDx.configure block.

• Framework agnostic — runs under Rails, Hanami, Sinatra, or plain Ruby. Runtime deps are limited to bigdecimal and logger; no ActiveSupport requirement.