Cb Analytics Cluster

Cluster operations

You have 9 cluster-level tools, mostly read-only.

Reachability and identity

• ping_cluster(cluster) — fast yes/no liveness check. Use this first when troubleshooting any other tool failure.
• get_cluster_info(cluster) — UUID + implementation version. Cheap; safe to call often.
• who_am_i(cluster) — what the cluster sees the current MCP user as (roles, domain). Useful when an AnalyticsAuthError shows up.

Capacity and health

• get_cluster_details(cluster) — nodes, memory quotas (memoryQuota, cbasMemoryQuota), balanced, rebalanceStatus. Read before any capacity decision.
• get_cluster_tasks(cluster) — every in-flight task (rebalance, compaction, XDCR). Empty list is the happy path.
• get_rebalance_progress(cluster) — focused view: rebalance only. Returns {"status": "none"} when nothing's running.

Auto-failover

• get_auto_failover_settings(cluster) — read current settings.
• configure_auto_failover(enabled, timeout, max_count, cluster) — Couchbase recommends enabled=True, timeout=120, max_count=1 for 3-node clusters; larger clusters can use max_count=2+.

System events

get_system_events(since_time, cluster) returns recent operational events (info / warning / error). since_time is an ISO 8601 timestamp; omit it for "everything the cluster will give us".

Use this for post-incident triage:

User: "Why did the cluster fail over at 03:00?"

1. get_system_events(since_time="2026-05-24T02:50:00Z")
2. Look for severity="warning"|"error" entries around that timestamp.

Confirmation patterns

• configure_auto_failover changes durable cluster state. Always confirm before calling. Restate the values you're about to set and which cluster.
• Never call any of these against the wrong cluster — cluster parameter is optional but if you have any doubt, pass it explicitly. Use list_clusters from the meta tools when in doubt.

What to avoid

• Don't poll get_cluster_tasks faster than once a second during a long rebalance; the management endpoint is shared with the GUI.
• Don't disable auto-failover in production unless you have an immediate reason and a plan to re-enable. Note the original values in chat before you change them so they're easy to restore.

Rate limits & safety

Cluster tools are almost all read (60/sec): ping_cluster, get_cluster_info, get_cluster_details, get_cluster_tasks, get_rebalance_progress, get_auto_failover_settings, get_system_events, who_am_i.

The single write (1/sec) tool here is configure_auto_failover — matches the safety advice above: never call this without explicit confirmation, and the rate limit gives you exactly one shot per second to fat-finger it.

When polling get_rebalance_progress during a long rebalance, the read rate (60/sec) is plenty but the management endpoint is shared with the GUI. Once every 2–5 seconds is the polite poll interval; faster won't get you better data and stresses the management plane.

If RateLimitExceeded comes back, honour retry_after_sec — back off, don't retry-storm.

Related skills

• cb-analytics-admin — Analytics service-level health (ingestion status, active queries) rather than cluster-level
• couchbase-mcp — full cluster administration (rebalance, node management, XDCR, eventing) via MCP-Couchbase