fix(ai,agent,coding-agent): share UUIDv7 and use for Codex (#6834)

packages/agent/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Breaking Changes
+
+- Moved the `uuidv7` export to `@earendil-works/pi-ai`.
+
 ## [0.80.10] - 2026-07-16
 
 ## [0.80.9] - 2026-07-16

packages/agent/src/harness/session/jsonl-storage.ts

@@ -1,7 +1,7 @@
+import { uuidv7 } from "@earendil-works/pi-ai";
 import type { FileSystem, JsonlSessionMetadata, LeafEntry, SessionStorage, SessionTreeEntry } from "../types.ts";
 import { SessionError, toError } from "../types.ts";
 import { getFileSystemResultOrThrow } from "./repo-utils.ts";
-import { uuidv7 } from "./uuid.ts";
 
 type JsonlSessionStorageFileSystem = Pick<FileSystem, "readTextFile" | "readTextLines" | "writeFile" | "appendFile">;
 

packages/agent/src/harness/session/memory-storage.ts

@@ -1,3 +1,4 @@
+import { uuidv7 } from "@earendil-works/pi-ai";
 import {
 	type LeafEntry,
 	SessionError,
@@ -5,7 +6,6 @@ import {
 	type SessionStorage,
 	type SessionTreeEntry,
 } from "../types.ts";
-import { uuidv7 } from "./uuid.ts";
 
 function updateLabelCache(labelsById: Map<string, string>, entry: SessionTreeEntry): void {
 	if (entry.type !== "label") return;

packages/agent/src/harness/session/repo-utils.ts

@@ -1,3 +1,4 @@
+import { uuidv7 } from "@earendil-works/pi-ai";
 import {
 	type FileError,
 	type Result,
@@ -7,7 +8,6 @@ import {
 	type SessionTreeEntry,
 } from "../types.ts";
 import { Session } from "./session.ts";
-import { uuidv7 } from "./uuid.ts";
 
 export function createSessionId(): string {
 	return uuidv7();

packages/agent/src/index.ts

@@ -33,7 +33,6 @@ export * from "./harness/session/memory-repo.ts";
 export * from "./harness/session/memory-storage.ts";
 export * from "./harness/session/repo-utils.ts";
 export * from "./harness/session/session.ts";
-export { uuidv7 } from "./harness/session/uuid.ts";
 export * from "./harness/skills.ts";
 export * from "./harness/system-prompt.ts";
 // Harness

packages/ai/CHANGELOG.md

@@ -2,8 +2,13 @@
 
 ## [Unreleased]
 
+### Added
+
+- Added a shared `uuidv7` utility for time-ordered identifiers.
+
 ### Fixed
 
+- Fixed sessionless OpenAI Codex WebSocket requests to use UUIDv7 request IDs, enabling models that reject UUIDv4 IDs.
 - Fixed GitHub Copilot long-context pricing tiers in generated model metadata ([#6668](https://github.com/earendil-works/pi/issues/6668)).
 - Fixed Kimi Coding subscription models to report API-equivalent implied costs when models.dev reports zero pricing.
 - Fixed OpenAI Responses early stream endings to be classified as retryable provider errors ([#6727](https://github.com/earendil-works/pi/issues/6727)).

packages/ai/src/api/openai-codex-responses.ts

@@ -46,6 +46,7 @@ import { formatProviderError, normalizeProviderError } from "../utils/error-body
 import { AssistantMessageEventStream } from "../utils/event-stream.ts";
 import { headersToRecord } from "../utils/headers.ts";
 import { resolveHttpProxyUrlForTarget } from "../utils/node-http-proxy.ts";
+import { uuidv7 } from "../utils/uuid.ts";
 import { clampOpenAIPromptCacheKey } from "./openai-prompt-cache.ts";
 import { convertResponsesMessages, convertResponsesTools, processResponsesStream } from "./openai-responses-shared.ts";
 import { buildBaseOptions } from "./simple-options.ts";
@@ -259,7 +260,7 @@ export const stream: StreamFunction<"openai-codex-responses", OpenAICodexRespons
 				body = nextBody as RequestBody;
 			}
 			const codexSessionId = clampOpenAIPromptCacheKey(options?.sessionId);
-			const websocketRequestId = codexSessionId || createCodexRequestId();
+			const websocketRequestId = codexSessionId || uuidv7();
 			const sseHeaders = buildSSEHeaders(model.headers, options?.headers, accountId, apiKey, codexSessionId);
 			const websocketHeaders = buildWebSocketHeaders(
 				model.headers,
@@ -1505,13 +1506,6 @@ function extractAccountId(token: string): string {
 	}
 }
 
-function createCodexRequestId(): string {
-	if (typeof globalThis.crypto?.randomUUID === "function") {
-		return globalThis.crypto.randomUUID();
-	}
-	return `codex_${Date.now()}_${Math.random().toString(36).slice(2, 10)}`;
-}
-
 function buildBaseCodexHeaders(
 	initHeaders: Record<string, string> | undefined,
 	additionalHeaders: ProviderHeaders | undefined,

packages/ai/src/index.ts

@@ -42,4 +42,5 @@ export * from "./utils/json-parse.ts";
 export * from "./utils/overflow.ts";
 export * from "./utils/retry.ts";
 export * from "./utils/typebox-helpers.ts";
+export { uuidv7 } from "./utils/uuid.ts";
 export * from "./utils/validation.ts";

packages/ai/src/utils/uuid.ts

@@ -1,10 +1,9 @@
 let lastTimestamp = -Infinity;
 let sequence = 0;
 
-function fillRandomBytes(bytes: Uint8Array): void {
+function fillRandomBytes(bytes: Uint8Array<ArrayBuffer>): void {
-	const crypto = globalThis.crypto;
+	if (globalThis.crypto?.getRandomValues) {
-	if (crypto?.getRandomValues) {
+		globalThis.crypto.getRandomValues(bytes);
-		crypto.getRandomValues(bytes);
 		return;
 	}
 	for (let i = 0; i < bytes.length; i++) {
@@ -12,6 +11,7 @@ function fillRandomBytes(bytes: Uint8Array): void {
 	}
 }
 
+/** Generate a time-ordered UUIDv7. */
 export function uuidv7(): string {
 	const random = new Uint8Array(16);
 	fillRandomBytes(random);
@@ -22,9 +22,7 @@ export function uuidv7(): string {
 		lastTimestamp = timestamp;
 	} else {
 		sequence = (sequence + 1) >>> 0;
-		if (sequence === 0) {
+		if (sequence === 0) lastTimestamp++;
-			lastTimestamp++;
-		}
 	}
 
 	const bytes = new Uint8Array(16);
@@ -45,10 +43,6 @@ export function uuidv7(): string {
 	bytes[14] = random[14];
 	bytes[15] = random[15];
 
-	return formatUuid(bytes);
-}
-
-function formatUuid(bytes: Uint8Array): string {
 	const hex = Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0"));
 	return `${hex.slice(0, 4).join("")}-${hex.slice(4, 6).join("")}-${hex.slice(6, 8).join("")}-${hex.slice(8, 10).join("")}-${hex.slice(10, 16).join("")}`;
 }

packages/ai/test/uuid.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
-import { uuidv7 } from "../../src/harness/session/uuid.ts";
+import { uuidv7 } from "../src/utils/uuid.ts";
 
 const UUID_V7_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-7[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/;
 const TIMESTAMP = 0x0123456789ab;

packages/coding-agent/src/core/session-manager.ts

@@ -1,5 +1,5 @@
-import { type AgentMessage, uuidv7 } from "@earendil-works/pi-agent-core";
+import type { AgentMessage } from "@earendil-works/pi-agent-core";
-import type { ImageContent, Message, TextContent } from "@earendil-works/pi-ai";
+import { type ImageContent, type Message, type TextContent, uuidv7 } from "@earendil-works/pi-ai";
 import { randomUUID } from "crypto";
 import {
 	appendFileSync,