fix issue with tool schemas and google

packages/opencode/src/tool/bash.ts

@@ -35,7 +35,7 @@ export const BashTool = Tool.define({
       .min(0)
       .max(MAX_TIMEOUT)
       .describe("Optional timeout in milliseconds")
-      .nullable(),
+      .optional(),
     description: z
       .string()
       .describe(

packages/opencode/src/tool/edit.ts

@@ -21,7 +21,7 @@ export const EditTool = Tool.define({
       ),
     replaceAll: z
       .boolean()
-      .nullable()
+      .optional()
       .describe("Replace all occurences of old_string (default false)"),
   }),
   async execute(params, ctx) {

packages/opencode/src/tool/glob.ts

@@ -11,7 +11,7 @@ export const GlobTool = Tool.define({
     pattern: z.string().describe("The glob pattern to match files against"),
     path: z
       .string()
-      .nullable()
+      .optional()
       .describe(
         `The directory to search in. If not specified, the current working directory will be used. IMPORTANT: Omit this field to use the default directory. DO NOT enter "undefined" or "null" - simply omit it for the default behavior. Must be a valid directory path if provided.`,
       ),

packages/opencode/src/tool/grep.ts

@@ -14,13 +14,13 @@ export const GrepTool = Tool.define({
       .describe("The regex pattern to search for in file contents"),
     path: z
       .string()
-      .nullable()
+      .optional()
       .describe(
         "The directory to search in. Defaults to the current working directory.",
       ),
     include: z
       .string()
-      .nullable()
+      .optional()
       .describe(
         'File pattern to include in the search (e.g. "*.js", "*.{ts,tsx}")',
       ),

packages/opencode/src/tool/ls.ts

@@ -29,11 +29,11 @@ export const ListTool = Tool.define({
       .describe(
         "The absolute path to the directory to list (must be absolute, not relative)",
       )
-      .nullable(),
+      .optional(),
     ignore: z
       .array(z.string())
       .describe("List of glob patterns to ignore")
-      .nullable(),
+      .optional(),
   }),
   async execute(params) {
     const app = App.info()

packages/opencode/src/tool/read.ts

@@ -19,11 +19,11 @@ export const ReadTool = Tool.define({
     offset: z
       .number()
       .describe("The line number to start reading from (0-based)")
-      .nullable(),
+      .optional(),
     limit: z
       .number()
       .describe("The number of lines to read (defaults to 2000)")
-      .nullable(),
+      .optional(),
   }),
   async execute(params, ctx) {
     let filePath = params.filePath

packages/opencode/src/tool/webfetch.ts

@@ -22,7 +22,7 @@ export const WebFetchTool = Tool.define({
       .min(0)
       .max(MAX_TIMEOUT / 1000)
       .describe("Optional timeout in seconds (max 120)")
-      .nullable(),
+      .optional(),
   }),
   async execute(params, ctx) {
     // Validate URL