Bug

When agents.list is configured in openclaw.json, ACP sessions spawned via sessions_spawn with runtime: "acp" are invisible to sessions_list and related tools.

Root Cause

loadCombinedSessionStoreForGateway() in src/gateway/session-utils.ts calls listConfiguredAgentIds() which, when agents.list is populated, only returns agent IDs from the config (e.g. main, leon). It never falls through to the disk scan path (listExistingAgentIdsFromDisk()).

ACP sessions are stored under dynamically-created agent dirs like agents/codex/sessions/ and agents/claude/sessions/. Since codex and claude aren't in agents.list, their session stores are never scanned.

Steps to Reproduce

1. Have agents.list configured with at least one agent (e.g. main)
2. Enable ACP: acp.enabled: true, backend: "acpx", allowedAgents: ["claude", "codex"]
3. Spawn an ACP session: sessions_spawn({ runtime: "acp", agentId: "codex", task: "...", mode: "run" })
4. Session returns status: "accepted" with a childSessionKey
5. sessions_list does not show the session
6. The session IS present in ~/.openclaw/agents/codex/sessions/sessions.json with ACP metadata

Expected Behavior

ACP sessions should be visible in sessions_list regardless of whether their agent ID is in agents.list.

Suggested Fix

listConfiguredAgentIds() should merge the config list with the disk scan, so dynamically-created ACP agent directories are included:

function listConfiguredAgentIds(cfg: OpenClawConfig): string[] {
  const ids = new Set<string>();
  const defaultId = normalizeAgentId(resolveDefaultAgentId(cfg));
  ids.add(defaultId);

  // Always include configured agents
  for (const entry of cfg.agents?.list ?? []) {
    if (entry?.id) ids.add(normalizeAgentId(entry.id));
  }

  // Always include agents that exist on disk (covers ACP-created dirs)
  for (const id of listExistingAgentIdsFromDisk()) {
    ids.add(id);
  }

  const sorted = Array.from(ids).filter(Boolean);
  sorted.sort((a, b) => a.localeCompare(b));
  return sorted.includes(defaultId)
    ? [defaultId, ...sorted.filter((id) => id !== defaultId)]
    : sorted;
}

Additional Issues Observed

• No .jsonl transcript files are created for ACP sessions (the ACP code path in dispatch-acp.ts never writes to SessionManager)
• ACP sessions show state: error with acpx exited with code 5 even when the agent successfully completed work (commits were made). This suppresses completion announcements.

Environment

• OpenClaw version: 2026.3.3
• acpx version: 0.1.15
• Config: agents.list with main and leon; acp.allowedAgents: ["claude", "codex"]