AI API receipt · sgl-project/sglang
sgl-project/sglang#43151 · upstream bug reproduced by running the issue's own reproduction
✓ Badgr rejects this response
Plain prose mentioning <parameter=...> produced a nameless tool call (tool_index=-1).
Outcome contract verdict: tool call has no function name. The attempt is recorded as failed (invalid_outcome) instead of a verified success, so it is not billed as a good answer and can fall back to another route.
The output the bug produces, taken from the issue’s reproduction and fed to Badgr’s validators. Not a live provider call.
data: {"choices": [{"index": 0, "delta": {"content": "The format is "}, "finish_reason": null}]}
data: {"choices": [{"index": 0, "delta": {"tool_calls": [{"index": -1, "function": {"arguments": "{\"location\": \"Boston\""}}]}, "finish_reason": null}]}
data: {"choices": [{"index": 0, "delta": {"content": " okay?"}, "finish_reason": "stop"}]}
data: [DONE]Written by Badgr’s receipt ledger and read back from GET /v1/receipts/replay-sglang-43151-prose-becomes-tool-call.
{
"request_id": "replay-sglang-43151-prose-becomes-tool-call",
"status": "failed",
"endpoint": "/v1/chat/completions",
"stream": true,
"failure_stage": "stream_contract",
"error_code": "invalid_outcome",
"error_message": "Stream did not complete a valid response: tool call has no function name",
"retryable": true,
"provider_mode": "replay",
"routing_decision": "replayed_upstream_output",
"created_at": "2026-10-09T02:14:36Z"
}Recorded 2026-10-09 in Badgr’s local development environment. Replay cases and verdicts are pinned by backend/test_ai_api_replay_cases.py.
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