diff --git a/notepad.md b/notepad.md
index 463781e..1f63da3 100644
--- a/notepad.md
+++ b/notepad.md
@@ -396,3 +396,38 @@ All tasks execution STARTED: Thu Dec 4 16:52:57 KST 2025
 
 ---
 
+## [2025-12-09 17:24] - Task 0: Shared Utilities 포팅
+
+### DISCOVERED ISSUES
+- command-executor.ts already existed but had minor whitespace differences (indentation inconsistency)
+- pattern-matcher.ts and hook-disabled.ts import from `../claude-compat/types` which doesn't exist yet in oh-my-opencode
+- Types will be created in Task 1 at `src/hooks/claude-code-hooks/types.ts`
+
+### IMPLEMENTATION DECISIONS
+- Created snake-case.ts and tool-name.ts (no dependencies) - exact copy from source
+- Created temporary stub types at `src/hooks/claude-code-hooks/types.ts` with minimal definitions needed for shared utilities
+- Created pattern-matcher.ts with adjusted import: `../claude-compat/types` → `../hooks/claude-code-hooks/types`
+- Created hook-disabled.ts with adjusted import to point to stub types
+- Added all new utilities to `src/shared/index.ts` using barrel export pattern
+- Stub types include: HookCommand, HookMatcher, ClaudeHooksConfig, ClaudeHookEvent, PluginConfig
+
+### PROBLEMS FOR NEXT TASKS
+- Task 1 will replace stub types with full implementation from opencode-cc-plugin
+- Stub types in `src/hooks/claude-code-hooks/types.ts` are marked with comments indicating they're temporary
+- The real PluginConfig will likely be different - current stub only supports `disabledHooks` field
+
+### VERIFICATION RESULTS
+- Ran: `bun run typecheck` → exit 0, no errors
+- All 5 functions exported: executeHookCommand, objectToSnakeCase, transformToolName, findMatchingHooks, isHookDisabled
+- Import paths verified: pattern-matcher.ts and hook-disabled.ts successfully import from stub types
+
+### LEARNINGS
+- Import paths must be adjusted when porting between different project structures
+- opencode-cc-plugin structure: `src/claude-compat/` → oh-my-opencode structure: `src/hooks/claude-code-hooks/`
+- Stub types strategy allows Task 0 to complete and typecheck to pass before Task 1 implements full types
+- command-executor.ts in oh-my-opencode had indentation inconsistency (not 100% identical to source)
+
+소요 시간: ~5분
+
+---
+
diff --git a/src/hooks/claude-code-hooks/types.ts b/src/hooks/claude-code-hooks/types.ts
new file mode 100644
index 0000000..3c517f9
--- /dev/null
+++ b/src/hooks/claude-code-hooks/types.ts
@@ -0,0 +1,25 @@
+// Temporary stub types for Task 0 - will be fully implemented in Task 1
+// These are minimal definitions to allow shared utilities to type-check
+
+export interface HookCommand {
+  type: string
+  command: string
+}
+
+export interface HookMatcher {
+  matcher: string
+  hooks: HookCommand[]
+}
+
+export interface ClaudeHooksConfig {
+  PreToolUse?: HookMatcher[]
+  PostToolUse?: HookMatcher[]
+  UserPromptSubmit?: HookMatcher[]
+  Stop?: HookMatcher[]
+}
+
+export type ClaudeHookEvent = "PreToolUse" | "PostToolUse" | "UserPromptSubmit" | "Stop"
+
+export interface PluginConfig {
+  disabledHooks?: boolean | ClaudeHookEvent[]
+}
diff --git a/src/shared/hook-disabled.ts b/src/shared/hook-disabled.ts
new file mode 100644
index 0000000..24b37ee
--- /dev/null
+++ b/src/shared/hook-disabled.ts
@@ -0,0 +1,22 @@
+import type { ClaudeHookEvent, PluginConfig } from "../hooks/claude-code-hooks/types"
+
+export function isHookDisabled(
+  config: PluginConfig,
+  hookType: ClaudeHookEvent
+): boolean {
+  const { disabledHooks } = config
+
+  if (disabledHooks === undefined) {
+    return false
+  }
+
+  if (disabledHooks === true) {
+    return true
+  }
+
+  if (Array.isArray(disabledHooks)) {
+    return disabledHooks.includes(hookType)
+  }
+
+  return false
+}
diff --git a/src/shared/index.ts b/src/shared/index.ts
index 9ce0414..7e87c2a 100644
--- a/src/shared/index.ts
+++ b/src/shared/index.ts
@@ -3,3 +3,7 @@ export * from "./command-executor"
 export * from "./file-reference-resolver"
 export * from "./model-sanitizer"
 export * from "./logger"
+export * from "./snake-case"
+export * from "./tool-name"
+export * from "./pattern-matcher"
+export * from "./hook-disabled"
diff --git a/src/shared/pattern-matcher.ts b/src/shared/pattern-matcher.ts
new file mode 100644
index 0000000..e236736
--- /dev/null
+++ b/src/shared/pattern-matcher.ts
@@ -0,0 +1,29 @@
+import type { ClaudeHooksConfig, HookMatcher } from "../hooks/claude-code-hooks/types"
+
+export function matchesToolMatcher(toolName: string, matcher: string): boolean {
+  if (!matcher) {
+    return true
+  }
+  const patterns = matcher.split("|").map((p) => p.trim())
+  return patterns.some((p) => {
+    if (p.includes("*")) {
+      const regex = new RegExp(`^${p.replace(/\*/g, ".*")}$`, "i")
+      return regex.test(toolName)
+    }
+    return p.toLowerCase() === toolName.toLowerCase()
+  })
+}
+
+export function findMatchingHooks(
+  config: ClaudeHooksConfig,
+  eventName: keyof ClaudeHooksConfig,
+  toolName?: string
+): HookMatcher[] {
+  const hookMatchers = config[eventName]
+  if (!hookMatchers) return []
+
+  return hookMatchers.filter((hookMatcher) => {
+    if (!toolName) return true
+    return matchesToolMatcher(toolName, hookMatcher.matcher)
+  })
+}
diff --git a/src/shared/snake-case.ts b/src/shared/snake-case.ts
new file mode 100644
index 0000000..cec7278
--- /dev/null
+++ b/src/shared/snake-case.ts
@@ -0,0 +1,51 @@
+export function camelToSnake(str: string): string {
+  return str.replace(/[A-Z]/g, (letter) => `_${letter.toLowerCase()}`)
+}
+
+export function snakeToCamel(str: string): string {
+  return str.replace(/_([a-z])/g, (_, letter) => letter.toUpperCase())
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value)
+}
+
+export function objectToSnakeCase(
+  obj: Record<string, unknown>,
+  deep: boolean = true
+): Record<string, unknown> {
+   const result: Record<string, unknown> = {}
+   for (const [key, value] of Object.entries(obj)) {
+     const snakeKey = camelToSnake(key)
+     if (deep && isPlainObject(value)) {
+       result[snakeKey] = objectToSnakeCase(value, true)
+     } else if (deep && Array.isArray(value)) {
+       result[snakeKey] = value.map((item) =>
+         isPlainObject(item) ? objectToSnakeCase(item, true) : item
+       )
+     } else {
+       result[snakeKey] = value
+     }
+   }
+   return result
+ }
+
+export function objectToCamelCase(
+  obj: Record<string, unknown>,
+  deep: boolean = true
+): Record<string, unknown> {
+   const result: Record<string, unknown> = {}
+   for (const [key, value] of Object.entries(obj)) {
+     const camelKey = snakeToCamel(key)
+     if (deep && isPlainObject(value)) {
+       result[camelKey] = objectToCamelCase(value, true)
+     } else if (deep && Array.isArray(value)) {
+       result[camelKey] = value.map((item) =>
+         isPlainObject(item) ? objectToCamelCase(item, true) : item
+       )
+     } else {
+       result[camelKey] = value
+     }
+   }
+   return result
+ }
diff --git a/src/shared/tool-name.ts b/src/shared/tool-name.ts
new file mode 100644
index 0000000..d94ede6
--- /dev/null
+++ b/src/shared/tool-name.ts
@@ -0,0 +1,26 @@
+const SPECIAL_TOOL_MAPPINGS: Record<string, string> = {
+  webfetch: "WebFetch",
+  websearch: "WebSearch",
+  todoread: "TodoRead",
+  todowrite: "TodoWrite",
+}
+
+function toPascalCase(str: string): string {
+  return str
+    .split(/[-_\s]+/)
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase())
+    .join("")
+}
+
+export function transformToolName(toolName: string): string {
+  const lower = toolName.toLowerCase()
+  if (lower in SPECIAL_TOOL_MAPPINGS) {
+    return SPECIAL_TOOL_MAPPINGS[lower]
+  }
+
+  if (toolName.includes("-") || toolName.includes("_")) {
+    return toPascalCase(toolName)
+  }
+
+  return toolName.charAt(0).toUpperCase() + toolName.slice(1)
+}