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feat(extension): let MCP clients label their tab groups - #43827

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triage/43823/41212725362-1
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microsoft-playwright-automation[bot] wants to merge 1 commit into
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triage/43823/41212725362-1

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Adds the extension-only browser_set_group_label MCP tool so sessions from the same client can identify their tasks. Labels are trimmed, limited to 50 characters, deduplicated, and reset to the client name when empty; updates preserve group ownership and color.

Uses a connection-local optional relay command without changing protocol v2. Older extensions get an update error, and connections with grouping disabled get an explicit error. The runtime tool was chosen over a startup option so the label can follow the task.

Fixes #43823

Prepared by the triage workflow.

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Test results for "MCP"

5194 passed, 616 skipped


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[Feature]: Let an MCP client label its own extension tab group

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