docs(collection): explain null cache/handler stats on Solr 10 in tool description - #163
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epugh merged 1 commit intoAug 18, 2026
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On Solr 10 the /admin/mbeans endpoint was removed, so get-collection-stats degrades gracefully and returns null cacheStats/handlerStats. Nothing on the tool surface said so, leaving MCP clients to treat the nulls as a failure and retry or misreport. State the behavior in the tool description, which every client reads. Kept to the description only to avoid colliding with PR apache#111, which touches the fetchCacheMetrics/fetchHandlerMetrics implementations. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: adityamparikh <aditya.m.parikh@gmail.com>
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Motivation
On Solr 10,
/admin/mbeanswas removed;get-collection-statsalready degrades gracefully and returnsnullforcacheStats/handlerStats. But nothing on the tool surface tells the client this is expected — an LLM client sees unexplained nulls and may retry, misreport a broken server, or go hunting for a workaround.A bare
nulla client must interpret is a documentation gap in the place clients actually look: the tool description.Changes
get-collection-statsdescription now states that on Solr 10+ the two stats are always null because the endpoint was removed from Solr, and that this is expected.Deliberately scoped to the description only: PR #111 is already modifying the
fetchCacheMetrics/fetchHandlerMetricscatch clauses, and this avoids conflicting with it. A follow-up could migrate to/admin/metricsto restore the stats on Solr 10.Description-only change — no behavior change.
./gradlew buildpasses (unit + Testcontainers integration tests).🤖 Generated with Claude Code