feat(core): Emit low cardinality mcp.server span names - #23569
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With span streaming enabled, resource methods are named after the method alone, so the client-supplied resource URI stays out of the span name. Tool and prompt names are unchanged. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013bjBXkGkJo8eL8hkz48byi
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What
With span streaming enabled,
mcp.serverspans for resource methods are named after the method alone (resources/read), instead of appending the resource URI. Tool and prompt names are unchanged, since those come from a bounded registry.Why
Span names must be low cardinality when span streaming is enabled, and a resource URI is supplied by the client. The URI remains available on the
mcp.resource.uriattribute.Closes: #23529