trace: Claude Code's `<synthetic>` notices count as requests and can make a Claude session price on the fallback curve

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Dal 9/11/2026.

  • #190 di @1AbdullahButt — aperta

Valutazione

Difficoltà
2/5
Tempo stimato
1-3 ore
Idoneità per principianti
20/100
Tipo di issue
Bug
Chiarezza
Specificata chiaramente
Stato di attività
Ferma
Stack tecnologico
python
Ambito
ai, backend

Direzione di ricerca

Read tokeneconomizer/trace/claude.py around claude_session_usage and the linked accounting code in tokeneconomizer/plugin/accounting.py. The issue includes a reproduction and expected output; compare how synthetic assistant entries affect request counting and model selection. Done means the reproduction reports one request, the real Claude model, and model pricing. A linked pull request is already open.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

When a request fails, or there is nothing to answer, Claude Code writes its own notice into the session log as an assistant entry. The entry has "model": "<synthetic>", its own message id, and a usage object of zeros. For example:

{"type": "assistant", "isApiErrorMessage": true, "message": {"id": "046e4526-...", "model": "<synthetic>", "role": "assistant", "usage": {"input_tokens": 0, "output_tokens": 0, "cache_creation_input_tokens": 0, "cache_read_input_tokens": 0, ...}, "content": [{"type": "text", "text": "API Error: Can't reach the API server ..."}]}}

I see these in my own logs for "API Error: ..." and "No response requested.".

claude_session_usage (trace/claude.py#L298-L315) counts each of these entries as a request and as a vote for <synthetic> as the session's model. So:

  • requests is too high by one for every notice. This number is in the ledger and in te status.
  • If the notices outnumber the real replies, model becomes <synthetic>. pricing.weights_for has no entry for it, so accounting.effective prices a plain Claude session on the fallback curve and records priced_by: "fallback". The accounting docstring says Claude ids never need the fallback. The fallback weighs output at 6x, where Claude's curve uses 5x.

The token totals are right, because the notices carry zeros.

Repro (on main at 264e7a7): one real reply, then two notices.

import json, os, tempfile
from tokeneconomizer import trace
from tokeneconomizer.plugin import accounting

def asst(mid, model, usage):
    return json.dumps({"type": "assistant", "message": {"id": mid, "model": model,
        "role": "assistant", "content": [{"type": "text", "text": "x"}], "usage": usage}})

zero = dict.fromkeys(("input_tokens", "output_tokens", "cache_creation_input_tokens",
                      "cache_read_input_tokens"), 0)
real = {"input_tokens": 10, "output_tokens": 200, "cache_creation_input_tokens": 1000,
        "cache_read_input_tokens": 5000}
p = os.path.join(tempfile.mkdtemp(), "s.jsonl")
open(p, "w").write("\n".join([asst("msg_1", "claude-sonnet-4-5", real),
                              asst("u-1", "<synthetic>", zero),
                              asst("u-2", "<synthetic>", zero)]) + "\n")
u = trace.claude_session_usage(p)
print(u["requests"], u["model"], accounting.effective(u))

Expected: 1 claude-sonnet-4-5 (2760.0, 'model')
Actual: 3 <synthetic> (2960.0, 'fallback')

I have a fix with a regression test and will open a PR.

Lingua principale
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