fix: agent streaming

[tevanburen]

Description

Small set of fixes to the agent-run harness and subagent infrastructure, surfaced while wiring up Playground's subagent UI.

Changes Made

• AgentRuntimeManager.getRun: always populate pendingActions (empty by default) instead of only when the run is INPUT_REQUIRED, so consumers get a consistent field on every response.
• SemossAgentHarness / HarnessToolExecutor: reattach _meta (including execution mode) to subagent tool calls (spawn/named/check/wait) — previously they had none, since they're not backed by room/workspace MCP metadata — and stop suppressing their tool-item stream events, so they render like ordinary tool calls instead of being hidden from the client.
• SubAgentToolSynthesizer: explicitly declare SMSS_MCP_EXECUTION=auto on all subagent tool definitions. Without it, reattaching _meta caused MCPUtility.getValidMcpExecution to default them to ask, which incorrectly paused every spawn/check/wait call for user approval.
• ModelInferenceLogsUtils.getUserConversations: exclude rooms with a non-null PARENT_ROOM_ID from GetPlaygroundRooms — every subagent spawn creates a real Room row, and these were leaking into the playground room list as if they were user-initiated conversations.

How to Test

1. In a room in agent mode, ask the model to spawn a subagent — spawn/wait/check should execute immediately, not pause for approval.
2. Fetch the persisted message via GetPlaygroundMessages — the SpawnSubAgent/WaitForSubAgent tool call should carry _meta.SMSS_TOOL_KIND and _meta.SMSS_MCP_EXECUTION="auto".
3. After a subagent spawn, check GetPlaygroundRooms — the subagent's own room should not appear in the list.
4. Call GetAgentRun on a run that isn't paused — pendingActions should be an empty array, not missing.

Notes

• Companion to the SemossWeb agent-streaming PR — Playground's subagent tool-card/stream rendering depends on the _meta/execution-mode fix here.

[snyk-io]

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✅	Open Source Security	0	0	0	0	0 issues

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