bug: tool.registry test fails on CI — custom tool import crashes registry when dependencies are missing

[mguttmann]

Description

The test tool.registry > loads tools with external dependencies without crashing introduced in #12227 (556adad67) fails deterministically on CI:

error: Cannot find package 'cowsay' from '/tmp/opencode-test-xxx/.opencode/tools/cowsay.ts'
(fail) tool.registry > loads tools with external dependencies without crashing [269.71ms]

This blocks all PRs targeting dev — the test (linux) check fails with 881 pass / 1 fail.

Root cause

Two issues:

1. No error handling in ToolRegistry.state() — await import(match) on line 44 of registry.ts throws when a custom tool has unresolvable dependencies, crashing the entire registry initialization instead of gracefully skipping the broken tool.

2. Test expects successful load without installing deps — the test creates a package.json with cowsay dependency but the dependency is never installed in the temp directory. Config.waitForDependencies() doesn't trigger the install in the test context. The test then asserts expect(ids).toContain("cowsay") which fails because the import throws.

Impact

Every PR targeting dev fails the test (linux) CI check. This started after #12227 was merged.

Suggested fix

1. Wrap the import(match) in registry.ts with try/catch — log a warning and skip tools that fail to import
2. Update the test expectation to not.toContain("cowsay") since the test name says "without crashing" (testing resilience, not successful loading)

PR with fix: incoming

[wlioi]

Related Issue: Zod TypeError in Custom Tools (#12336)

I reported a separate but related issue (#12336) about Zod schema validation failures when loading custom tools from the .opencode directory.

Summary of #12336

• Error: TypeError: undefined is not an object (evaluating 'schema._zod.def')
• Location: src/session/prompt.ts:704:62 (in resolveTools)
• Root cause: Zod 4.1.8 toJSONSchema function lacks defensive checks when processing nested basic types like ZodString/ZodNumber
• Trigger: Using @opencode-ai/plugin tool() function with Zod schema args

Connection to this issue

Both issues involve custom tool loading failures:

• bug: tool.registry test fails on CI — custom tool import crashes registry when dependencies are missing #12269: Dependency import failures (missing error handling)
• Bug: Zod TypeError when loading custom tools from .opencode directory #12336: Schema validation failures (missing Zod defensive checks)

Suggestion

Consider adding comprehensive error handling for custom tool loading that covers:

1. Dependency resolution (your PR)
2. Schema validation (needs separate fix)

The issue occurs when OpenCode internally calls z.toJSONSchema(item.parameters) during tool resolution.