kai392 6e2cbb727a fix(ai): prevent Anthropic chat crash on no-argument tool calls (#2755) ...

* fix: prevent Anthropic chat crash on no-argument tool calls

When the model streams a tool_use block with no arguments (e.g.
get_categories), the accumulated input arrives as an empty string.
The Anthropic chat parser passed that empty string straight through as
function_args, and Assistant::FunctionToolCaller then called
JSON.parse("") — which raises "unexpected end of input", surfaces as a
Provider::Anthropic::Error, and kills the whole assistant turn.

Fix at the source by normalizing empty/nil tool input to an empty JSON
object in the parser, plus a defensive guard in FunctionToolCaller so
any provider that emits blank arguments cannot crash a turn.

Fixes #2722

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test: assert nil-args result as Hash to match jsonb function_result

Addresses Codex P1 / CodeRabbit review: EchoFunction returns the parsed
params Hash and ToolCall::Function stores it in a jsonb column, so the
nil-arguments test must assert the Hash directly instead of JSON.parse.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-07-26 04:47:15 +02:00

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