Bug: webchat clients cannot patch sessions error on every message send

[alexcam1901]

Bug Report

Description

Every message sent in the main session via the webchat interface triggers the following error:

Error: webchat clients cannot patch sessions; use chat.send for session-scoped updates

Steps to Reproduce

1. Open openclaw-studio with a webchat session
2. Send any message in the main session chat
3. Error appears on every send

Expected Behavior

Messages send without error.

Actual Behavior

Error fires on every message send. Appears to be studio attempting to call a session patch endpoint that webchat explicitly blocks.

Suspected Cause

Something in the chat send flow (possibly AgentChatPanel.tsx or useConfigMutationQueue.ts) is triggering a session patch call that isn't permitted for webchat clients.

Environment

• openclaw-studio: latest (post merge of upstream/main as of 2026-02-19)
• Channel: webchat