Port from Kilo-Org/kilocode#11955: Gemini validates every object schema's
required list strictly against the same node's properties and fails the
ENTIRE GenerateContentRequest with HTTP 400 'required[0]: property is not
defined' when a name has no matching property. MCP servers (e.g. the GitHub
remote MCP) routinely emit array item schemas carrying required without
properties, which made every request on the native Gemini path fail before
any model output.
sanitize_gemini_schema() now filters required to names present in the node's
properties and drops the keyword when nothing valid remains. Applies
recursively (properties / items / anyOf). Tool handlers still validate
required fields at execution time, so nothing the model could actually use
is lost.
Scoped to the Gemini-facing sanitizer only — the universal
tools/schema_sanitizer.py already prunes typed object nodes, and its
remaining gap (untyped nodes) is contested by open PR #20151.
Gemini's Schema validator requires every `enum` entry to be a string,
even when the parent `type` is integer/number/boolean. Discord's
`auto_archive_duration` parameter (`type: integer, enum: [60, 1440,
4320, 10080]`) tripped this on every request that shipped the full
tool catalog to generativelanguage.googleapis.com, surfacing as
`Gateway: Non-retryable client error: Gemini HTTP 400 (INVALID_ARGUMENT)
Invalid value ... (TYPE_STRING), 60` and aborting the turn.
Sanitize by dropping the `enum` key when the declared type is numeric
or boolean and any entry is non-string. The `type` and `description`
survive, so the model still knows the allowed values; the tool handler
keeps its own runtime validation. Other providers (OpenAI,
OpenRouter, Anthropic) are unaffected — the sanitizer only runs for
native Gemini / cloudcode adapters.
Reported by @selfhostedsoul on Discord with hermes debug share.
