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Anthropic 400 on computer use after a model upgrade: the tool type is now computer_toolset_20260801

Computer use calls that worked before return 400 invalid_request_error on Opus 5.5. Covers migrating from computer_20251124 to computer_toolset_20260801, dropping the beta header, and updating the agent loop. Not for 401 auth errors or other Anthropic tool types.

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Anthropic 400 on computer use after a model upgrade: the tool type is now computer_toolset_20260801