plat 397

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PLAT-397 — Full CLI uses its own subagents; run_in_background only for read-only reviewers and long loops

Coordination	Value
State	fixed on main; not deployed
Date	2026-10-03
Owner	coding-agent-bridge
Related	PLAT-390 (two modes), PLAT-396 (no bridge edit tool in full mode)

Decision (owner, 2026-10-03)

With native tools on, parallel work within a turn goes to the CLI's own subagents. execute_step and run_full_workflow are already background calls. run_in_background stays only for what native subagents cannot do: an independent reviewer held read-only by the platform (access_mode="read_only"; a native subagent inherits its parent's write rights), and a long supervision loop that outlives the turn (steps it starts report back to it). Pulse's reviewer keeps using it.

Done

• Prompt section native-subagents (Full CLI chats only) says so; the run_in_background description in workflow-tools names the same scope.

Found in owner testing (2026-10-04)

• Codex got the section but ran a read-only plan review on its own spawn_agent ("where it is available" left room; in a CLI the tool is reached through search_tools). The rule is now firm: a review that must not change anything goes to run_in_background with access_mode="read_only", never the CLI's own subagents, with how to find the tool.

Left

• Nothing; removal was considered and rejected for the two uses above.