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desktop: cannot select or default an agent (no picker, default_agent ignored) #53944
Description
Description
Summary
On the OpenCode desktop app (2.0.25, Windows), there is no way to select or default a primary agent. New sessions always start on build, default_agent is ignored, and no agent picker is available. The terminal client on the same machine, server, and config works correctly, so this is isolated to the desktop client.
Environment
- opencode version: desktop app 2.0.25.0; CLI + background service 2.0.25
- OS: Windows 10.0.26200.9448 (win32 x64)
- Client: OpenCode desktop app (OPENCODE_CLIENT=desktop)
- Install/channel: latest
Reproduction
- Open a project that defines a custom primary agent and sets
default_agent(projectopencode.jsoncwith"default_agent": "myagent"plus.opencode/agent/myagent.md,mode: primary). - In the desktop app, open a new session in that project.
- The session starts on
build, notmyagent. - Try to switch agents: no selector in the toolbar;
Ctrl+Phas no "List agents";Shift+Tabonly moves focus.
Expected
New sessions honor default_agent, and an agent picker is available to switch primary agents.
Actual
New sessions always start on build. default_agent is ignored (project and global config). There is no UI to change the agent.
Additional Context
- The terminal client (opencode 2.0.25), same server and config, works: it honors
default_agentand offers the agent picker (<leader>a/Shift+Tab). GET /api/agentlists the custom agent as a visible primary alongsideBuild,Plan,scout.- A session created via
POST /api/sessionhas an emptyagentfield — the default is applied client-side, and the desktop client doesn't apply it. - Server and desktop UI are both 2.0.25 (no version skew).
Plugins
No response
OpenCode version
No response
Steps to reproduce
No response
Screenshot and/or share link
No response
Operating System
No response
Terminal
No response
Activity
rore commentedon Oct 8, 2026
Looks like a duplicate of - #50269 - closing.
opencode-agent commentedon Oct 8, 2026
Thanks for the detailed report. I reproduced this with the web UI from
opencode serve, which is built from the same client code as the desktop app (packages/app), on 2.0.25 and on the latestv2(0621ea9d9).Setup: a project with
"default_agent": "myagent"inopencode.jsoncand.opencode/agent/myagent.md(mode: primary).Myagent, as you described.GET /api/agentlistsmyagentas a visible primary agent, andPOST /api/sessioncreates a session with noagent.Ctrl+Phas no agent entry.Build, and the session is saved withagent: build.From the code, there seem to be two causes:
nativefield the v2 API doesn't return, so it never finds one. This part is the same as app: project-local custom agents never make the composer agent picker visible (native flag missing from public Agent.Info) #50269.build, and it never readsdefault_agent.Turning on Show agent should at least bring the picker back. I haven't checked whether that also makes new sessions start on your default agent.
Related: #50269 (hidden picker), #37225 (
default_agentignored in the v2 TUI), #45873 (same symptom in the v1 web UI).2362 commentedon Oct 15, 2026
still reproduces on desktop 2.0.29 (Windows)