refactor(shared): consolidate 13+ getMessageDir copies into single shared function

src/hooks/anthropic-context-window-limit-recovery/message-storage-directory.ts

@@ -1,3 +1,4 @@
+import { existsSync, readdirSync } from "node:fs"
 import { getMessageDir } from "../../shared/opencode-message-dir"
 
 export { getMessageDir }

src/hooks/anthropic-context-window-limit-recovery/pruning-deduplication.ts

@@ -1,9 +1,9 @@
-import { existsSync, readdirSync, readFileSync } from "node:fs"
+import { readdirSync, readFileSync } from "node:fs"
 import { join } from "node:path"
 import type { PruningState, ToolCallSignature } from "./pruning-types"
 import { estimateTokens } from "./pruning-types"
 import { log } from "../../shared/logger"
-import { MESSAGE_STORAGE } from "../../features/hook-message-injector"
+import { getMessageDir } from "../../shared/opencode-message-dir"
 
 export interface DeduplicationConfig {
   enabled: boolean
@@ -43,20 +43,6 @@ function sortObject(obj: unknown): unknown {
   return sorted
 }
 
-function getMessageDir(sessionID: string): string | null {
-  if (!existsSync(MESSAGE_STORAGE)) return null
-
-  const directPath = join(MESSAGE_STORAGE, sessionID)
-  if (existsSync(directPath)) return directPath
-
-  for (const dir of readdirSync(MESSAGE_STORAGE)) {
-    const sessionPath = join(MESSAGE_STORAGE, dir, sessionID)
-    if (existsSync(sessionPath)) return sessionPath
-  }
-
-  return null
-}
-
 function readMessages(sessionID: string): MessagePart[] {
   const messageDir = getMessageDir(sessionID)
   if (!messageDir) return []
@@ -64,7 +50,7 @@ function readMessages(sessionID: string): MessagePart[] {
   const messages: MessagePart[] = []
   
   try {
-    const files = readdirSync(messageDir).filter(f => f.endsWith(".json"))
+    const files = readdirSync(messageDir).filter((f: string) => f.endsWith(".json"))
     for (const file of files) {
       const content = readFileSync(join(messageDir, file), "utf-8")
       const data = JSON.parse(content)

src/hooks/anthropic-context-window-limit-recovery/pruning-tool-output-truncation.ts

@@ -3,6 +3,7 @@ import { join } from "node:path"
 import { getOpenCodeStorageDir } from "../../shared/data-path"
 import { truncateToolResult } from "./storage"
 import { log } from "../../shared/logger"
+import { getMessageDir } from "../../shared/opencode-message-dir"
 
 interface StoredToolPart {
   type?: string
@@ -21,21 +22,6 @@ function getPartStorage(): string {
   return join(getOpenCodeStorageDir(), "part")
 }
 
-function getMessageDir(sessionID: string): string | null {
-  const messageStorage = getMessageStorage()
-  if (!existsSync(messageStorage)) return null
-
-  const directPath = join(messageStorage, sessionID)
-  if (existsSync(directPath)) return directPath
-
-  for (const dir of readdirSync(messageStorage)) {
-    const sessionPath = join(messageStorage, dir, sessionID)
-    if (existsSync(sessionPath)) return sessionPath
-  }
-
-  return null
-}
-
 function getMessageIds(sessionID: string): string[] {
   const messageDir = getMessageDir(sessionID)
   if (!messageDir) return []

src/hooks/atlas/recent-model-resolver.ts

@@ -1,6 +1,6 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 import { findNearestMessageWithFields } from "../../features/hook-message-injector"
-import { getMessageDir } from "../../shared/session-utils"
+import { getMessageDir } from "../../shared"
 import type { ModelInfo } from "./types"
 
 export async function resolveRecentModelForSession(

src/hooks/atlas/session-last-agent.ts

@@ -1,5 +1,5 @@
 import { findNearestMessageWithFields } from "../../features/hook-message-injector"
-import { getMessageDir } from "../../shared/session-utils"
+import { getMessageDir } from "../../shared"
 
 export function getLastAgentFromSession(sessionID: string): string | null {
   const messageDir = getMessageDir(sessionID)

src/hooks/prometheus-md-only/agent-resolution.ts

@@ -1,22 +1,7 @@
-import { existsSync, readdirSync } from "node:fs"
-import { join } from "node:path"
-import { findNearestMessageWithFields, findFirstMessageWithAgent, MESSAGE_STORAGE } from "../../features/hook-message-injector"
+import { findNearestMessageWithFields, findFirstMessageWithAgent } from "../../features/hook-message-injector"
 import { getSessionAgent } from "../../features/claude-code-session-state"
 import { readBoulderState } from "../../features/boulder-state"
-
-function getMessageDir(sessionID: string): string | null {
-  if (!existsSync(MESSAGE_STORAGE)) return null
-
-  const directPath = join(MESSAGE_STORAGE, sessionID)
-  if (existsSync(directPath)) return directPath
-
-  for (const dir of readdirSync(MESSAGE_STORAGE)) {
-    const sessionPath = join(MESSAGE_STORAGE, dir, sessionID)
-    if (existsSync(sessionPath)) return sessionPath
-  }
-
-  return null
-}
+import { getMessageDir } from "../../shared/opencode-message-dir"
 
 function getAgentFromMessageFiles(sessionID: string): string | undefined {
   const messageDir = getMessageDir(sessionID)

src/hooks/ralph-loop/message-storage-directory.ts

@@ -1,16 +1 @@
-import { existsSync, readdirSync } from "node:fs"
-import { join } from "node:path"
-import { MESSAGE_STORAGE } from "../../features/hook-message-injector"
-
-export function getMessageDir(sessionID: string): string | null {
-	if (!existsSync(MESSAGE_STORAGE)) return null
-
-	const directPath = join(MESSAGE_STORAGE, sessionID)
-	if (existsSync(directPath)) return directPath
-
-	for (const dir of readdirSync(MESSAGE_STORAGE)) {
-		const sessionPath = join(MESSAGE_STORAGE, dir, sessionID)
-		if (existsSync(sessionPath)) return sessionPath
-	}
-	return null
-}
+export { getMessageDir } from "../../shared/opencode-message-dir"

src/hooks/todo-continuation-enforcer/message-directory.ts

@@ -1,18 +1 @@
-import { existsSync, readdirSync } from "node:fs"
-import { join } from "node:path"
-
-import { MESSAGE_STORAGE } from "../../features/hook-message-injector"
-
-export function getMessageDir(sessionID: string): string | null {
-  if (!existsSync(MESSAGE_STORAGE)) return null
-
-  const directPath = join(MESSAGE_STORAGE, sessionID)
-  if (existsSync(directPath)) return directPath
-
-  for (const dir of readdirSync(MESSAGE_STORAGE)) {
-    const sessionPath = join(MESSAGE_STORAGE, dir, sessionID)
-    if (existsSync(sessionPath)) return sessionPath
-  }
-
-  return null
-}
+export { getMessageDir } from "../../shared/opencode-message-dir"