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TypeError: undefined is not an object (evaluating 'schema2._zod.def') - zod v3/v4 conflict when plugins bundle zod v4 #21155
Description
Describe the bug
When a plugin that depends on zod v4 is installed (e.g. oh-my-openagent), opencode crashes immediately with the following error when attempting to execute any tool:
TypeError: undefined is not an object (evaluating 'schema2._zod.def')
at process (/$bunfs/root/src/cli/cmd/tui/worker.js:80980:29)
at toJsoNschema (/$bunfs/root/src/cli/cmd/tui/worker.js:81668:15)
To Reproduce
- Install oh-my-openagent (depends on zod ^4.1.8)
- Add it to opencode.json: `"plugin": ["oh-my-openagent"]`
- Run `opencode`
- Type any instruction (e.g., "hello")
- Crash on first tool execution — any model, any plugin
Expected behavior
OpenCode should work normally with plugins that bundle zod v4.
Environment
- opencode version: 1.3.16
- OS: macOS 25.3.0
- Plugin: [email protected] (zod ^4.1.8)
Root Cause Analysis
The bundled worker.js in opencode's Bun runtime internally uses zod v3's private API `_zod.def` in the `toJsonSchema` function (worker.js:81668). When a plugin brings in zod v4, zod v4 schemas are passed to this function, but zod v4 does not expose the same `_zod.def` internal structure. This causes `schema2` to be undefined.
Reproduction
- `opencode --pure` (no plugins) → works perfectly
- `opencode` with oh-my-openagent → crash on first tool
Possible Fixes
- Migrate internal `toJsonSchema` to use public zod APIs or a version-agnostic schema extraction approach
- Pin opencode's bundled zod to v4 to match the plugin ecosystem
- Isolate plugins' zod v4 from the global Bun module scope (module bundling/pinning)
Reacted by Pierre Teyssedre, Omar Abdelmegid, Kenneth Luján Rosas, bulga138, Pável Kalmykov Razgovórov, rvpv, adrian-pattz, Vasily Pelikh and Bada
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github-actions commentedon Apr 6, 2026
This issue might be a duplicate of an existing issue. Please check:
zodToJsonSchemabroken with Zod v4), which shares the same root cause — zod v3 APIs being used internally while zod v4 is present.pavel-kalmykov commentedon Apr 20, 2026
The same crash fires from the claude-mem OpenCode plugin (thedotmack/claude-mem). v12.3.2 (shipped 2026-04-20) still declares
claude_mem_search'sargsas a plain JS object ({query: {type: "string", description: "..."}}) instead of a Zod schema, so it hits this exacttoJsonSchema(schema._zod.def)path.Repro:
npx claude-mem install --ide opencodeopencode, submit any prompt#maybeClose→#handleOnExitinchild_processwithTypeError: undefined is not an object (evaluating 'n._zod.def')Upstream tracks it: thedotmack/claude-mem#1947 is open (reopened by the maintainer after an accidental backlog cleanup), and their PR #2063 tried a fix but closed unmerged.
For now: delete
~/.config/opencode/plugins/claude-mem.js, or runopencode --pure.rpiwnicki commentedon Apr 21, 2026
I have same problem with
n._zod.def.OpenCode crashes on every prompt after install claude-mem.
abnersajr commentedon Apr 22, 2026
Same issue here. A screenshot of the error. As soon I send any message on opencode it triggers the error.
NulisKode commentedon Apr 23, 2026
how to fixxx, Same issue here :(
obiwancenobi commentedon Apr 23, 2026
@NulisKode as mentioned above: For now: delete ~/.config/opencode/plugins/claude-mem.js, or run opencode --pure.
mendax-iitm commentedon Apr 23, 2026
Same issue
xuxusheng commentedon Apr 29, 2026
same +1
Hamza-Bik commentedon May 5, 2026
If OpenCode crashes right after first prompt with an error like:
TypeError: undefined is not an object (evaluating 'n._zod.def')
it may be caused by a third-party plugin (in my case: claude-mem), not the model itself.
What worked
Run OpenCode in pure mode to confirm plugin issue:
opencode --pureDisable plugin by moving it out of plugins folder:
mkdir -p ~/.config/opencode/plugins.disabled mv ~/.config/opencode/plugins/claude-mem.js ~/.config/opencode/plugins.disabled/claude-mem.js.disabled3.Verify no plugins are loaded:
opencode debug infoExpected output includes:
plugins:
none
rekram1-node commentedon May 5, 2026
oc uses zod v4, maybe ur on older oc version
github-actions commentedon Jul 5, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.