CritterWatchUnderstand and Operate Critter Stack Systems

From dev-time insight to production control for Wolverine, Marten, and Polecat — for you and your AI agents.

AI-Assisted Development & Troubleshooting

Point Claude or any MCP agent at one endpoint and it can query every monitored service — spans by saga/stream, projection lag, dead letters, alerts, metrics — then take action, tenant-scoped and RBAC-gated. Diagnose an incident or explain your config without leaving the chat.

Connect Your AI →

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Understand How Your System Works

Not just for production. At dev time CritterWatch shows what your Wolverine and Marten wiring really does — live event models, store schema and DDL, generated handler and projection source, HTTP endpoint chains. The ground truth, not your mental model.

Event Modeling →

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Step Through Projections Live

The Projection Stepper replays a projection over a real slice of your event store and walks you row-by-row through the before/after state — the same code production runs — with a JSON diff at every step. The fastest answer to "why is this aggregate shaped like that at version N?"

Projection Stepper →

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Real-Time Monitoring

Live dashboards showing service health, node and agent status, throughput metrics, and error rates — all updated via SignalR as events happen.

Dashboard →

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Dead Letter Queue Management

Query, filter, replay, edit-and-replay, or discard dead-lettered messages across all services from a single unified view. Batch operations, CSV export, and exception grouping included.

DLQ Explorer →

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Projection Monitoring

Track async projection lag, detect stalls, and trigger pause, restart, rebuild, or rewind operations directly from the console — no code changes or service restarts required.

Projections →

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Fully Event-Sourced Alerting

Configurable thresholds with a complete alert lifecycle — raised, elevated, reduced, resolved, cleared — all stored as immutable events in Marten for a full audit trail.

Alerts →

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Multi-Tenant Support

Add, disable, and remove tenants at runtime. Per-tenant metric breakdowns, DLQ filtering, and projection health for organizations running multi-tenant Wolverine applications.

Multi-Tenancy →

Better together with the official JasperFx AI Skills

CritterWatch gives your AI assistant a live, queryable view of your running system. The JasperFx AI Skills give it the expertise to use that view well — curated, packaged knowledge for building and operating Wolverine, Marten, and Polecat applications. Point your agent at both and it can reason about your architecture and inspect what it is actually doing in production.

Explore the AI Skills →

Free to monitor, licensed to operate

CritterWatch is free to use in read-only monitoring mode — connect as many services as you like and watch your whole Critter Stack without a license key. A commercial license unlocks every administrative action (DLQ replay, projection rebuilds, listener and node control, tenant management, and more) and the entire MCP server for your AI agents.

Access & Licensing →