Two new Mantle shims, auto-installed alongside the existing pair:
- Opt out of the fine-grained-tool-streaming beta. Under it, an
output-token cutoff mid-tool_use ends the stream without
content_block_stop; fast-agent raises "Streaming completed but tool
call never finished" and burns its retry ladder against the same
wall (the observed ~700s Alan revise_workspace_file failures on
Taurus).
- Clamp default maxTokens to Mantle's observed 20 000-token server
ceiling, so the model stops gracefully (proper block close +
stop_reason=max_tokens) instead of being cut off by the gateway.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
