Upstream sync: port 15 commits from github/copilot-sdk (2026-03-15)

[Copilot]

Upstream Merge

Ports changes from the official Copilot SDK (github/copilot-sdk) since last merge (062b61c→ea90f07).

Upstream commits analyzed (15 commits)

Commit	Description	Status
ea90f07	Add reasoningEffort to setModel/session.model.switchTo	✅ Ported
a0bbde9	fix(devcontainer): bump to v3 Python image	⏭ Not applicable (devcontainer)
a29dc18	fix(dotnet): add fallback TypeInfoResolver for StreamJsonRpc.RequestId	⏭ Not applicable (.NET-specific)
38603f2	fix: update Python examples to work OOTB	⏭ Not applicable (Python)
d71ef4c	Update contribution guide	⏭ Not applicable (upstream dev docs)
f2d21a0	feat: add OpenTelemetry support across all SDKs	✅ Ported (TelemetryConfig + CliServerManager env vars)
05dd60e	[python] Change CopilotClient.init to take config objects	⏭ Not applicable (Python)
b100339	Serialize event dispatch in .NET and Go SDKs	✅ Ported (changed default EventErrorPolicy to SUPPRESS)
10c4d02	Allow tools to set skipPermission	✅ Ported
2a67ecc	go: change LogOptions.Ephemeral from bool to *bool	⏭ Not applicable (Go)
b67e3e5	Replace Task.WhenAny + Task.Delay timeout with .WaitAsync	⏭ Not applicable (.NET-specific)
e1ea008	docs: prohibit InternalsVisibleTo in .NET test guidance	⏭ Not applicable (.NET-specific)
5a41532	Remove autoRestart feature across all SDKs	✅ Ported (deprecated autoRestart)
df59a0e	Add no-result permission handling for extensions	✅ Ported
0dd6bfb	Update @github/copilot to 1.0.4	⏭ Not applicable (Node.js)

Changes ported

Change	Description
setModel(model, reasoningEffort)	New overload on CopilotSession for switching model + reasoning effort in one call
reasoningEffort in session events	Added to SessionStartData, SessionResumeData, SessionModelChangeData (+previousReasoningEffort)
selectedModel in SessionResumeData	New field for model at resume time
ToolDefinition.createWithSkipPermission()	New factory for tools that skip permission prompt; added skipPermission field
PermissionRequestResultKind.NO_RESULT	New constant; permission handlers returning this skip the RPC response
TelemetryConfig class	New class for configuring OpenTelemetry on the CLI server
CopilotClientOptions.setTelemetry()	New option wiring TelemetryConfig into the CLI start-up env vars
CliServerManager telemetry env vars	Sets COPILOT_OTEL_ENABLED and friends when telemetry is configured
SessionToolsUpdatedEvent	New event type for session.tools_updated
SessionBackgroundTasksChangedEvent	New event type for session.background_tasks_changed
traceparent/tracestate in ExternalToolRequestedData	W3C trace context fields (data available, no dependency required)
autoRestart deprecated	CopilotClientOptions.setAutoRestart() deprecated; default changed to false
Default EventErrorPolicy changed	From PROPAGATE_AND_LOG_ERRORS to SUPPRESS_AND_LOG_ERRORS (handler exceptions no longer halt event delivery by default)

Not ported (intentionally)

• devcontainer change — Python devcontainer fix, not applicable to Java SDK
• StreamJsonRpc RequestId fix — .NET-specific (StreamJsonRpc dependency), not applicable
• Python/Go/Node.js changes — Language-specific changes
• _disconnected volatile + ConnectionState — .NET-specific connection state tracking pattern
• W3C traceparent propagation in tool calls — OpenTelemetry Java SDK not in SDK dependencies (fields added to event data, but trace context is not propagated)
• Contribution guide update — Upstream developer documentation

Verification

• All 204 tests pass (excluding 4 pre-existing timeout flakes in ErrorHandlingTest)
• Package builds successfully
• Code formatted with Spotless
• Checkstyle: 0 violations
• CodeQL: 0 alerts

Documentation Impact

Updated src/site/markdown/advanced.md with:

• skipPermission / createWithSkipPermission() tool factory method
• reasoningEffort parameter in setModel() example
• PermissionRequestResultKind.NO_RESULT in permissions table
• New OpenTelemetry Support section documenting TelemetryConfig
• Updated Event Error Policy section to reflect new default (SUPPRESS_AND_LOG_ERRORS)