diff --git a/SPEC.md b/SPEC.md
index fc68fb71..23e9bed2 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -215,11 +215,10 @@ Maps names to inodes (directory entries).
 
 ```sql
 CREATE TABLE fs_dentry (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
   name TEXT NOT NULL,
   parent_ino INTEGER NOT NULL,
   ino INTEGER NOT NULL,
-  UNIQUE(parent_ino, name)
+  PRIMARY KEY(parent_ino, name)
 )
 
 CREATE INDEX idx_fs_dentry_parent ON fs_dentry(parent_ino, name)
@@ -227,7 +226,6 @@ CREATE INDEX idx_fs_dentry_parent ON fs_dentry(parent_ino, name)
 
 **Fields:**
 
-- `id` - Internal entry ID
 - `name` - Basename (filename or directory name)
 - `parent_ino` - Parent directory inode number
 - `ino` - Inode this entry points to
diff --git a/sdk/python/agentfs_sdk/filesystem.py b/sdk/python/agentfs_sdk/filesystem.py
index 2584316a..7d572356 100644
--- a/sdk/python/agentfs_sdk/filesystem.py
+++ b/sdk/python/agentfs_sdk/filesystem.py
@@ -125,11 +125,10 @@ async def _initialize(self) -> None:
             );
 
             CREATE TABLE IF NOT EXISTS fs_dentry (
-                id INTEGER PRIMARY KEY AUTOINCREMENT,
                 name TEXT NOT NULL,
                 parent_ino INTEGER NOT NULL,
                 ino INTEGER NOT NULL,
-                UNIQUE(parent_ino, name)
+                PRIMARY KEY(parent_ino, name)
             );
 
             CREATE INDEX IF NOT EXISTS idx_fs_dentry_parent
diff --git a/sdk/rust/src/filesystem/agentfs.rs b/sdk/rust/src/filesystem/agentfs.rs
index 19a7da19..70469de3 100644
--- a/sdk/rust/src/filesystem/agentfs.rs
+++ b/sdk/rust/src/filesystem/agentfs.rs
@@ -484,11 +484,10 @@ impl AgentFS {
         // Create directory entry table
         conn.execute(
             "CREATE TABLE IF NOT EXISTS fs_dentry (
-                id INTEGER PRIMARY KEY AUTOINCREMENT,
                 name TEXT NOT NULL,
                 parent_ino INTEGER NOT NULL,
                 ino INTEGER NOT NULL,
-                UNIQUE(parent_ino, name)
+                PRIMARY KEY(parent_ino, name)
             )",
             (),
         )
diff --git a/sdk/typescript/src/filesystem/agentfs.ts b/sdk/typescript/src/filesystem/agentfs.ts
index df0a087d..fc0eaa1e 100644
--- a/sdk/typescript/src/filesystem/agentfs.ts
+++ b/sdk/typescript/src/filesystem/agentfs.ts
@@ -255,11 +255,10 @@ export class AgentFS implements FileSystem {
 
     await this.db.exec(`
       CREATE TABLE IF NOT EXISTS fs_dentry (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
         name TEXT NOT NULL,
         parent_ino INTEGER NOT NULL,
         ino INTEGER NOT NULL,
-        UNIQUE(parent_ino, name)
+        PRIMARY KEY(parent_ino, name)
       )
     `);
 
diff --git a/sdk/typescript/src/integrations/cloudflare/agentfs.ts b/sdk/typescript/src/integrations/cloudflare/agentfs.ts
index 76e36bc0..3a1309b2 100644
--- a/sdk/typescript/src/integrations/cloudflare/agentfs.ts
+++ b/sdk/typescript/src/integrations/cloudflare/agentfs.ts
@@ -337,11 +337,10 @@ export class AgentFS implements FileSystem {
 
     this.storage.sql.exec(`
       CREATE TABLE IF NOT EXISTS fs_dentry (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
         name TEXT NOT NULL,
         parent_ino INTEGER NOT NULL,
         ino INTEGER NOT NULL,
-        UNIQUE(parent_ino, name)
+        PRIMARY KEY(parent_ino, name)
       )
     `);