mcp: add ServerOptions.DefaultCacheable - #1128
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Allow servers to override the Cacheable defaults stamped on SDK-generated results (discover, list methods, resources/read). Nil keeps historical public/0 defaults. Fixes modelcontextprotocol#1094
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Summary
Adds
ServerOptions.DefaultCacheable *Cacheableso multi-tenant / private servers can override the SDK's forced cacheable defaults (cacheScope: "public",ttlMs: 0) on SDK-generated results.setDefaultCacheableValuesonserver/discover,tools/list,prompts/list,resources/list,resources/templates/list, andresources/read(after the handler returns).Cacheableper result after the SDK stamps values (useful for per-request / per-tenant policy).Fixes #1094
Motivation
Servers whose list/discover payloads are tenant-scoped want
private(and a real TTL) as the SDK baseline, not only via post-hoc middleware type-switches. A single option covers all current SDK stamp sites and any future call sites that use the same helper.Test plan
go test ./mcp/ -run 'TestServerDefaultCacheable|TestSetDefaultCacheableValues' -count=1go test ./mcp/ -count=1go test ./... -count=1DefaultCacheableis nilprivate/60s stamped on list + read results when setTTLMs(read handler) while forcingCacheScope: "public"