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Experimental plan mode handover -> build uses plan agent's model #9296
Description
Description
Planned with configured GTP-5.2, handover to build errored with GPT-5.2 rather than the configured opus-4.5
Plugins
No response
OpenCode version
1.1.25
Steps to reproduce
{
"$schema": "https://opencode.ai/config.json",
"agent": {
"plan": {
"model": "github-copilot/gpt-5.2"
},
"build": {
"model": "github-copilot/claude-opus-4.5"
},
},
}OPENCODE_EXPERIMENTAL_PLAN_MODE=1 opencodePlan and handover to build -> Errors with bad tool calls
⚙ functions.glob [pattern=packages/opencode/src/**/__tests__/**/*, path=/Users/stevoland/workspace/github.com/sst/opencode]
Tool 'functions.glob' not in registry. External tools (MCP, environment) cannot be batched - call them directly. Available tools: question, bash, read, glob, grep, edit, write, task, webfetch, todowrite, todoread, skill, lsp, plan_exit, plan_enter, repo-explorer, repo-explorer_repo_ast, repo-explorer_repo_cleanup, repo-explorer_repo_clone, repo-explorer_repo_deps, repo-explorer_repo_exports, repo-explorer_repo_file, repo-explorer_repo_find, repo-explorer_repo_hotspots, repo-explorer_repo_search, repo-explorer_repo_structure, github-triage, github-pr-search
Invalid 'messages[15].tool_calls[1].function.name': string does not match pattern. Expected a string that matches the pattern '^[a-zA-Z0-9_-]+$'.
▣ Build · gpt-5.2
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github-actions commentedon Jan 18, 2026
This issue might be a duplicate of existing issues. Please check:
use_skilltool switches agent to default_agent unexpectedly #9067: Callinguse_skilltool switches agent to default_agent unexpectedly (same version 1.1.25)Feel free to ignore if none of these address your specific case.
dymoo commentedon Feb 27, 2026
seems to switch but continues using plan model, quite annoying as I have to pres esc twice and continue with correct build model
filipeandre commentedon Mar 19, 2026
ok #18163 ?
MessiasLima commentedon Apr 30, 2026
Same issue here. Im using GLM and Kimi from OpenCode Go
MessiasLima commentedon May 5, 2026
@thdxr is this not a bug? Could you please explain whats the Team vision about this behaviour?
Tuxie commentedon Jun 18, 2026
This is super annoying and still a problem in 1.17.8.
mrstruijk commentedon Jul 20, 2026
This is still happening.
stevoland commentedon Aug 19, 2026
I'm closing cos v2 and it makes me seem whiny
log0u7 commentedon Sep 30, 2026
+1 - this still reproduces on
dev, as noted in #50609 (which fixes the root cause: the plan agent's model no longer leaks into the build agent afterplan_exit). Earlier attempts #23971 and #29457 were closed unmerged, but this one is small, tested and mergeable - it just needs a maintainer review. Pinging the thread here so it gets picked up.