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Michael Suchacz
f073323c89
Unify the three subagent spawn tools (`spawn_agent`, `spawn_explore_agent`, `spawn_computer_use_agent`) behind a single `spawn_subagent` tool keyed by a `subagent_type` discriminant (`general`, `explore`, `computer_use`). Mirrors the single-entry-point pattern already used by `task` in mux while keeping `wait_agent`, `message_agent`, and `close_agent` as separate lifecycle tools. A new backend subagent definition catalog (`coderd/x/chatd/subagent_catalog.go`) is the source of truth for tool description, prompt guidance, availability rules (plan mode, desktop/Anthropic gating), and child-chat option building. `spawn_subagent` advertises only the types available in the current context and validates `subagent_type` server-side; context inheritance still flows through the existing `createChildSubagentChatWithOptions` path. `wait_agent`, `message_agent`, and `close_agent` responses now include a server-derived `subagent_type` so the UI stops inferring lifecycle state from tool names. The frontend gets a shared normalization helper (`site/src/pages/AgentsPage/components/ChatElements/tools/subagentDescriptor.ts`) that maps either legacy tool names or new `spawn_subagent` args into a common descriptor (action, variant, icon, fallback copy). Legacy transcripts still render identically; `Tool.tsx`, `SubagentTool.tsx`, `ToolLabel.tsx`, `ToolIcon.tsx`, and `messageParsing.ts` now key off the descriptor instead of hard-coded names. Existing UI copy is preserved (`Spawning Explore agent...`, `Using the computer...`, computer-use monitor icon and Open Desktop affordance). > This PR was opened by Mux working on Mike's behalf.