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Per-agent model configuration has no effect when using ACP #46311
Description
Description
Expected behavior
ACP prompt routing should match CLI behavior in terms of per-agent models taking precedence over the session default.
Actural behavior
- The ACP prompt handler always passes the session-level model as
input.modeltosession.prompt(). This short-circuits the fallback chain inprompt.ts, soag.modelis never reached. loadDirectorySnapshotinservice.tsstrips agent models when building the mode list, mapping other agent fields but omittingmodel. Meanwhile the CLI path indirectory.tscorrectly includes the model spread.
Plugins
None
OpenCode version
1.18.25 (dc4449d)
Steps to reproduce
- Configure per-agent models in
opencode.jsonc:
{
"agent": {
"plan": { "model": "provider/large-model" },
"build": { "model": "provider/fast-model" }
}
}- Connect an ACP client (e.g., Xcode) and create a new session
- Switch to the "plan" agent via
session/set_modeorsession/set_config_option - Send a prompt
- Observe the provider logs; the prompt is routed to the session-level default model, not
provider/large-model - For comparison, run the same agent via the CLI:
opencode run --agent plan "hello", where the CLI correctly routes toprovider/large-model
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github-actions commentedon Aug 30, 2026
This issue might be a duplicate of existing issues. Please check:
If your issue adds new detail (e.g. the
loadDirectorySnapshotstripping agent models, or the specific CLI-vs-ACP divergence indirectory.tsvsservice.ts), that context is still valuable to include in the existing issues.neriousy commentedon Oct 20, 2026
Thanks for the detailed report. This is about the ACP integration in OpenCode v1 (
opencode-ai1.18.25), which now only gets critical fixes, so it won't be fixed there. v2 (@opencode/cli) has a rewritten ACP integration, and theservice.ts/prompt.tscode paths you traced aren't used there anymore. Per-agent model handling on v2 is tracked in #55727. If you still see per-agent models ignored over ACP on v2, comment with your version and steps and we'll reopen.