diff --git a/bun.lock b/bun.lock
index 400a6b18c..ea2977023 100644
--- a/bun.lock
+++ b/bun.lock
@@ -154,6 +154,7 @@
         "solid-list": "catalog:",
         "tailwindcss": "catalog:",
         "virtua": "catalog:",
+        "zod": "catalog:",
       },
       "devDependencies": {
         "@happy-dom/global-registrator": "20.0.11",
diff --git a/packages/desktop/package.json b/packages/desktop/package.json
index 60cb900d6..36226365f 100644
--- a/packages/desktop/package.json
+++ b/packages/desktop/package.json
@@ -56,6 +56,7 @@
     "solid-js": "catalog:",
     "solid-list": "catalog:",
     "tailwindcss": "catalog:",
-    "virtua": "catalog:"
+    "virtua": "catalog:",
+    "zod": "catalog:"
   }
 }
diff --git a/packages/desktop/src/components/prompt-input.tsx b/packages/desktop/src/components/prompt-input.tsx
index 7f6c0ee4f..ac56793f4 100644
--- a/packages/desktop/src/components/prompt-input.tsx
+++ b/packages/desktop/src/components/prompt-input.tsx
@@ -21,7 +21,7 @@ import { DialogSelectModelUnpaid } from "@/components/dialog-select-model-unpaid
 import { useProviders } from "@/hooks/use-providers"
 import { useCommand, formatKeybind } from "@/context/command"
 import { persisted } from "@/utils/persist"
-import { Identifier } from "@opencode-ai/util/identifier"
+import { Identifier } from "@/utils/id"
 
 const ACCEPTED_IMAGE_TYPES = ["image/png", "image/jpeg", "image/gif", "image/webp"]
 const ACCEPTED_FILE_TYPES = [...ACCEPTED_IMAGE_TYPES, "application/pdf"]
diff --git a/packages/desktop/src/utils/id.ts b/packages/desktop/src/utils/id.ts
new file mode 100644
index 000000000..fa27cf4c5
--- /dev/null
+++ b/packages/desktop/src/utils/id.ts
@@ -0,0 +1,99 @@
+import z from "zod"
+
+const prefixes = {
+  session: "ses",
+  message: "msg",
+  permission: "per",
+  user: "usr",
+  part: "prt",
+  pty: "pty",
+} as const
+
+const LENGTH = 26
+let lastTimestamp = 0
+let counter = 0
+
+type Prefix = keyof typeof prefixes
+export namespace Identifier {
+  export function schema(prefix: Prefix) {
+    return z.string().startsWith(prefixes[prefix])
+  }
+
+  export function ascending(prefix: Prefix, given?: string) {
+    return generateID(prefix, false, given)
+  }
+
+  export function descending(prefix: Prefix, given?: string) {
+    return generateID(prefix, true, given)
+  }
+}
+
+function generateID(prefix: Prefix, descending: boolean, given?: string): string {
+  if (!given) {
+    return create(prefix, descending)
+  }
+
+  if (!given.startsWith(prefixes[prefix])) {
+    throw new Error(`ID ${given} does not start with ${prefixes[prefix]}`)
+  }
+
+  return given
+}
+
+function create(prefix: Prefix, descending: boolean, timestamp?: number): string {
+  const currentTimestamp = timestamp ?? Date.now()
+
+  if (currentTimestamp !== lastTimestamp) {
+    lastTimestamp = currentTimestamp
+    counter = 0
+  }
+
+  counter += 1
+
+  let now = BigInt(currentTimestamp) * BigInt(0x1000) + BigInt(counter)
+
+  if (descending) {
+    now = ~now
+  }
+
+  const timeBytes = new Uint8Array(6)
+  for (let i = 0; i < 6; i += 1) {
+    timeBytes[i] = Number((now >> BigInt(40 - 8 * i)) & BigInt(0xff))
+  }
+
+  return prefixes[prefix] + "_" + bytesToHex(timeBytes) + randomBase62(LENGTH - 12)
+}
+
+function bytesToHex(bytes: Uint8Array): string {
+  let hex = ""
+  for (let i = 0; i < bytes.length; i += 1) {
+    hex += bytes[i].toString(16).padStart(2, "0")
+  }
+  return hex
+}
+
+function randomBase62(length: number): string {
+  const chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+  const bytes = getRandomBytes(length)
+  let result = ""
+  for (let i = 0; i < length; i += 1) {
+    result += chars[bytes[i] % 62]
+  }
+  return result
+}
+
+function getRandomBytes(length: number): Uint8Array {
+  const bytes = new Uint8Array(length)
+  const cryptoObj = typeof globalThis !== "undefined" ? globalThis.crypto : undefined
+
+  if (cryptoObj && typeof cryptoObj.getRandomValues === "function") {
+    cryptoObj.getRandomValues(bytes)
+    return bytes
+  }
+
+  for (let i = 0; i < length; i += 1) {
+    bytes[i] = Math.floor(Math.random() * 256)
+  }
+
+  return bytes
+}
diff --git a/packages/opencode/src/id/id.ts b/packages/opencode/src/id/id.ts
index dea89894f..ad6e22e1b 100644
--- a/packages/opencode/src/id/id.ts
+++ b/packages/opencode/src/id/id.ts
@@ -1,19 +1,73 @@
-import { Identifier as SharedIdentifier } from "@opencode-ai/util/identifier"
+import z from "zod"
+import { randomBytes } from "crypto"
 
 export namespace Identifier {
-  export type Prefix = SharedIdentifier.Prefix
+  const prefixes = {
+    session: "ses",
+    message: "msg",
+    permission: "per",
+    user: "usr",
+    part: "prt",
+    pty: "pty",
+  } as const
 
-  export const schema = (prefix: Prefix) => SharedIdentifier.schema(prefix)
-
-  export function ascending(prefix: Prefix, given?: string) {
-    return SharedIdentifier.ascending(prefix, given)
+  export function schema(prefix: keyof typeof prefixes) {
+    return z.string().startsWith(prefixes[prefix])
   }
 
-  export function descending(prefix: Prefix, given?: string) {
-    return SharedIdentifier.descending(prefix, given)
+  const LENGTH = 26
+
+  // State for monotonic ID generation
+  let lastTimestamp = 0
+  let counter = 0
+
+  export function ascending(prefix: keyof typeof prefixes, given?: string) {
+    return generateID(prefix, false, given)
   }
 
-  export function create(prefix: Prefix, descending: boolean, timestamp?: number) {
-    return SharedIdentifier.createPrefixed(prefix, descending, timestamp)
+  export function descending(prefix: keyof typeof prefixes, given?: string) {
+    return generateID(prefix, true, given)
+  }
+
+  function generateID(prefix: keyof typeof prefixes, descending: boolean, given?: string): string {
+    if (!given) {
+      return create(prefix, descending)
+    }
+
+    if (!given.startsWith(prefixes[prefix])) {
+      throw new Error(`ID ${given} does not start with ${prefixes[prefix]}`)
+    }
+    return given
+  }
+
+  function randomBase62(length: number): string {
+    const chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+    let result = ""
+    const bytes = randomBytes(length)
+    for (let i = 0; i < length; i++) {
+      result += chars[bytes[i] % 62]
+    }
+    return result
+  }
+
+  export function create(prefix: keyof typeof prefixes, descending: boolean, timestamp?: number): string {
+    const currentTimestamp = timestamp ?? Date.now()
+
+    if (currentTimestamp !== lastTimestamp) {
+      lastTimestamp = currentTimestamp
+      counter = 0
+    }
+    counter++
+
+    let now = BigInt(currentTimestamp) * BigInt(0x1000) + BigInt(counter)
+
+    now = descending ? ~now : now
+
+    const timeBytes = Buffer.alloc(6)
+    for (let i = 0; i < 6; i++) {
+      timeBytes[i] = Number((now >> BigInt(40 - 8 * i)) & BigInt(0xff))
+    }
+
+    return prefixes[prefix] + "_" + timeBytes.toString("hex") + randomBase62(LENGTH - 12)
   }
 }
diff --git a/packages/util/src/identifier.ts b/packages/util/src/identifier.ts
index 272507f0a..ba28a351b 100644
--- a/packages/util/src/identifier.ts
+++ b/packages/util/src/identifier.ts
@@ -1,99 +1,48 @@
-import z from "zod"
+import { randomBytes } from "crypto"
 
 export namespace Identifier {
-  const prefixes = {
-    session: "ses",
-    message: "msg",
-    permission: "per",
-    user: "usr",
-    part: "prt",
-    pty: "pty",
-  } as const
-
-  export type Prefix = keyof typeof prefixes
-  type CryptoLike = {
-    getRandomValues<T extends ArrayBufferView>(array: T): T
-  }
-
-  const TOTAL_LENGTH = 26
-  const RANDOM_LENGTH = TOTAL_LENGTH - 12
-  const BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+  const LENGTH = 26
 
+  // State for monotonic ID generation
   let lastTimestamp = 0
   let counter = 0
 
-  const fillRandomBytes = (buffer: Uint8Array) => {
-    const cryptoLike = (globalThis as { crypto?: CryptoLike }).crypto
-    if (cryptoLike?.getRandomValues) {
-      cryptoLike.getRandomValues(buffer)
-      return buffer
-    }
-    for (let i = 0; i < buffer.length; i++) {
-      buffer[i] = Math.floor(Math.random() * 256)
-    }
-    return buffer
+  export function ascending() {
+    return create(false)
   }
 
-  const randomBase62 = (length: number) => {
-    const bytes = fillRandomBytes(new Uint8Array(length))
+  export function descending() {
+    return create(true)
+  }
+
+  function randomBase62(length: number): string {
+    const chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
     let result = ""
+    const bytes = randomBytes(length)
     for (let i = 0; i < length; i++) {
-      result += BASE62[bytes[i] % BASE62.length]
+      result += chars[bytes[i] % 62]
     }
     return result
   }
 
-  const createSuffix = (descending: boolean, timestamp?: number) => {
+  export function create(descending: boolean, timestamp?: number): string {
     const currentTimestamp = timestamp ?? Date.now()
+
     if (currentTimestamp !== lastTimestamp) {
       lastTimestamp = currentTimestamp
       counter = 0
     }
-    counter += 1
+    counter++
 
-    let value = BigInt(currentTimestamp) * 0x1000n + BigInt(counter)
-    if (descending) value = ~value
+    let now = BigInt(currentTimestamp) * BigInt(0x1000) + BigInt(counter)
 
-    const timeBytes = new Uint8Array(6)
+    now = descending ? ~now : now
+
+    const timeBytes = Buffer.alloc(6)
     for (let i = 0; i < 6; i++) {
-      timeBytes[i] = Number((value >> BigInt(40 - 8 * i)) & 0xffn)
+      timeBytes[i] = Number((now >> BigInt(40 - 8 * i)) & BigInt(0xff))
     }
-    const hex = Array.from(timeBytes)
-      .map((byte) => byte.toString(16).padStart(2, "0"))
-      .join("")
-    return hex + randomBase62(RANDOM_LENGTH)
-  }
 
-  const generateID = (prefix: Prefix, descending: boolean, given?: string, timestamp?: number) => {
-    if (given) {
-      const expected = `${prefixes[prefix]}_`
-      if (!given.startsWith(expected)) throw new Error(`ID ${given} does not start with ${expected}`)
-      return given
-    }
-    return `${prefixes[prefix]}_${createSuffix(descending, timestamp)}`
-  }
-
-  export const schema = (prefix: Prefix) => z.string().startsWith(`${prefixes[prefix]}_`)
-
-  export function ascending(): string
-  export function ascending(prefix: Prefix, given?: string): string
-  export function ascending(prefix?: Prefix, given?: string) {
-    if (prefix) return generateID(prefix, false, given)
-    return create(false)
-  }
-
-  export function descending(): string
-  export function descending(prefix: Prefix, given?: string): string
-  export function descending(prefix?: Prefix, given?: string) {
-    if (prefix) return generateID(prefix, true, given)
-    return create(true)
-  }
-
-  export function create(descending: boolean, timestamp?: number) {
-    return createSuffix(descending, timestamp)
-  }
-
-  export function createPrefixed(prefix: Prefix, descending: boolean, timestamp?: number) {
-    return generateID(prefix, descending, undefined, timestamp)
+    return timeBytes.toString("hex") + randomBase62(LENGTH - 12)
   }
 }