Clarify tool validation error messages (#1023) #493

Job	Run time
Client Conformance (elicitation-sep1034-client-defaults)	47s
Server Conformance	52s
Client Conformance (initialize)	52s
Client Conformance (sse-retry)	51s
Client Conformance (tools_call)	43s
Auth Conformance (auth/scope-from-www-authenticate)	53s
Auth Conformance (auth/token-endpoint-auth-none)	51s
Auth Conformance (auth/metadata-var2)	40s
Auth Conformance (auth/token-endpoint-auth-post)	51s
Auth Conformance (auth/token-endpoint-auth-basic)	54s
Auth Conformance (auth/scope-from-scopes-supported)	43s
Auth Conformance (auth/pre-registration)	49s
Auth Conformance (auth/scope-omitted-when-undefined)	41s
Auth Conformance (auth/scope-retry-limit)	41s
Auth Conformance (auth/scope-step-up)	47s
Auth Conformance (auth/metadata-var1)	51s
Auth Conformance (auth/metadata-var3)	1m 3s
Auth Conformance (auth/metadata-default)	39s
Auth Conformance (auth/basic-cimd)	45s
	15m 13s

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