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fix(anthropic): strip top-level oneOf/allOf/anyOf from tool input_schema

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Extends the existing _normalize_tool_input_schema to also drop top-level
union keywords that Anthropic's tool schema validator rejects with HTTP 400.

Several upstream and plugin tools ship schemas with a top-level oneOf/
allOf/anyOf (common for Pydantic discriminated unions). The existing
strip_nullable_unions pass only handles anyOf-with-null patterns; a
non-null top-level union keyword sails through and hits the API.

Salvage of #16471 — approach folded into the existing normalize helper
rather than introducing a parallel _sanitize_input_schema function, to
avoid two schema-munging code paths running against the same input.

Co-authored-by: Grey0202 <grey0202@users.noreply.github.com>
This commit is contained in:
Grey0202 2026-05-04 03:17:12 -07:00 • committed by Teknium
parent 412f2389f1
commit a219a0a4df
1 changed files with 14 additions and 0 deletions
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14
agent/anthropic_adapter.py
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@ -1225,6 +1225,14 @@ def _normalize_tool_input_schema(schema: Any) -> Dict[str, Any]:
``keep_nullable_hint=False`` because the Anthropic validator does not
recognize the OpenAPI-style ``nullable: true`` extension and strict
schema-to-grammar converters may reject unknown keywords.
Top-level ``oneOf``/``allOf``/``anyOf`` are also stripped here: the
Anthropic API rejects union keywords at the schema root with a generic
HTTP 400. Several upstream and plugin tools ship schemas with one of
these keywords at the top level (commonly for Pydantic discriminated
unions). If we land here with those keywords still present after
nullable-union stripping, drop them and fall back to a plain object
schema so the tool still validates at the Anthropic boundary.
"""
if not schema:
return {"type": "object", "properties": {}}
@ -1234,6 +1242,12 @@ def _normalize_tool_input_schema(schema: Any) -> Dict[str, Any]:
normalized = strip_nullable_unions(schema, keep_nullable_hint=False)
if not isinstance(normalized, dict):
return {"type": "object", "properties": {}}
# Strip top-level union keywords that Anthropic's validator rejects.
banned = {"oneOf", "allOf", "anyOf"}
if banned & normalized.keys():
normalized = {k: v for k, v in normalized.items() if k not in banned}
if "type" not in normalized:
normalized["type"] = "object"
if normalized.get("type") == "object" and not isinstance(normalized.get("properties"), dict):
normalized = {**normalized, "properties": {}}
return normalized