mcp: inject new-protocol metadata in default send path - #1167
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| if cs.usesNewProtocol() { | ||
| params = injectRequestMeta(cs, params) | ||
| } |
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why not removing this call from all the other client send methods
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Several client-originated requests in the >= 2026-07-28 protocol still relied on individual API methods to attach the per-request
_metafields. That left send paths such as notifications and registered custom methods withoutprotocolVersion,clientInfo, andclientCapabilities, so modern servers treated them as legacy or uninitialized requests.This changes the default client send handler to clone outgoing params and inject missing request metadata for modern sessions, while keeping the legacy initialize, ping, logging, root-subscription, and resource subscribe compatibility methods on their existing path.
CallCustomMethodnow relies on the shared send path, so caller params are not mutated just to add metadata before serialization.Tests:
Full
go test ./...currently fails only the existing localhost-protection casesTestSSELocalhostProtection/0.0.0.0_via_localhost_rejects_evil.comandTestStreamableLocalhostProtection/0.0.0.0_via_localhost_rejects_evil.comin this environment; all other packages pass.