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Use `@sentry/conventions/attributes` for registered MCP keys, including
all singleton and indexed result fields. The branch now uses published
conventions `0.27.0` from `develop`, so both local result prefixes can
be removed.
Before, the SDK constructed `mcp.tool.result.0.content` from a local
prefix. After, `MCP_TOOL_RESULT_KEY_CONTENT.replace('<key>', '0')`
produces that same key. Singleton keys, values, original array indexes,
and input/output capture behavior remain unchanged. Deprecated
tool-result fields stay emitted for compatibility; this change adds no
aliases or backfill.
This is the mechanical base for network metadata (#24506), OAuth
attribution (#24508), and canonical OpenTelemetry attributes (#25060).
The latter separately adds complete serialized results in
`gen_ai.tool.call.result`.
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OAuth registration can identify a different application from MCP
clientInfo, but transportAuthInfohas no standard client name. Add an opt-ingetOAuthClientNameresolver that records the registered name asmcp.auth.client.name, independently ofmcp.client.name.For example, when a registered application named
Example Desktopconnects through a client identifying asexample-connector, before the span contains onlymcp.client.name = "example-connector". After configuring the resolver, it also containsmcp.auth.client.name = "Example Desktop".Resolve the name once per incoming request, including discovery and unsupported methods. The callback receives
clientIdand application-definedextrametadata when available and may read request-scoped authentication context. Only the returned name is recorded; resolver failures leave dispatch intact. Preserve the wrapper's existing first-explicit-value option behavior. Real HTTP coverage exercises both MCP SDK majors in ESM/CJS, concurrent requests, and missing identities.#25059 is merged; this branch is rebased on develop and imports
MCP_AUTH_CLIENT_NAMEfrom published@sentry/conventions@0.27.0. The conventions publication blocker is resolved. This identity distinction follows MCP client registration. Network metadata (#24506) and canonical attributes (#25060) remain separate changes.Validated the 48-project SDK build, formatting and lint, 151 MCP unit tests, and ten real MCP SDK v1/v2 integration tests after rebase.