fix(tool): bridge custom tool zod metadata

[rekram1-node]

Summary

• bridge Zod metadata from config-scoped custom tool schemas into the local JSON Schema conversion path
• remove the plugin-side precomputed jsonSchema path added in fix(tool): preserve custom tool arg descriptions #27750 so stale installed plugin packages are handled too
• update regression coverage to simulate an older config-scoped @opencode-ai/plugin package that only returns raw Zod args

Closes#4357

References #27750 and #19916.

Testing

• bun test test/tool/registry.test.ts

[rekram1-node]

/review

[github-actions]

lgtm

[khimaros]

@rekram1-node thank you for merging this. however, there is still an issue with invalid enum values compared with my original PR.

[khimaros]

the simplest fix i can come up with (to properly validate enums and return an error to the LLM when invalid):

diff --git a/packages/opencode/src/tool/registry.ts b/packages/opencode/src/tool/registry.ts
index 879855c36..b0f927053 100644
--- a/packages/opencode/src/tool/registry.ts+++ b/packages/opencode/src/tool/registry.ts@@ -156,13 +156,22 @@ export const layer: Layer.Layer<
description: def.description,
execute: (args, toolCtx) =>
Effect.gen(function* () {
+ let input: unknown = args+ if (zodParams) {+ const validated = zodParams.safeParse(args)+ if (!validated.success)+ throw new Error(+ `The ${id} tool was called with invalid arguments: ${validated.error}.\nPlease rewrite the input so it satisfies the expected schema.`,+ )+ input = validated.data+ }
const pluginCtx: PluginToolContext = {
...toolCtx,
ask: (req) => toolCtx.ask(req),
directory: ctx.directory,
worktree: ctx.worktree,
}
- const result = yield* Effect.promise(() => def.execute(args as any, pluginCtx))+ const result = yield* Effect.promise(() => def.execute(input as any, pluginCtx))
const output = typeof result === "string" ? result : result.output
const metadata = typeof result === "string" ? {} : (result.metadata ?? {})
const attachments = typeof result === "string" ? undefined : result.attachments