TypeError: undefined is not an object (evaluating 'schema2._zod.def') - zod v3/v4 conflict when plugins bundle zod v4

[hrygo]

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

1. Install oh-my-openagent (depends on zod ^4.1.8)
2. Add it to opencode.json: `"plugin": ["oh-my-openagent"]`
3. Run `opencode`
4. Type any instruction (e.g., "hello")
5. 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: oh-my-openagent@3.15.2 (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

1. Migrate internal `toJsonSchema` to use public zod APIs or a version-agnostic schema extraction approach
2. Pin opencode's bundled zod to v4 to match the plugin ecosystem
3. Isolate plugins' zod v4 from the global Bun module scope (module bundling/pinning)

[github-actions]

This issue might be a duplicate of an existing issue. Please check:

• experimental.ts uses zodToJsonSchema which is broken with Zod v4 #20807: Also reports zod v4 incompatibility in opencode (zodToJsonSchema broken with Zod v4), which shares the same root cause — zod v3 APIs being used internally while zod v4 is present.

[pavel-kalmykov]

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's args as a plain JS object ({query: {type: "string", description: "..."}}) instead of a Zod schema, so it hits this exact toJsonSchema(schema._zod.def) path.

Repro:

1. npx claude-mem install --ide opencode
2. launch opencode, submit any prompt
3. crash at #maybeClose → #handleOnExit in child_process with TypeError: 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 run opencode --pure.

[rpiwnicki]

I have same problem with n._zod.def.
OpenCode crashes on every prompt after install claude-mem.

[abnersajr]

Same issue here. A screenshot of the error. As soon I send any message on opencode it triggers the error.

[NulisKode]

how to fixxx, Same issue here :(

[obiwancenobi]

how to fixxx, Same issue here :(

@NulisKode as mentioned above: For now: delete ~/.config/opencode/plugins/claude-mem.js, or run opencode --pure.

[mendax-iitm]

Same issue