Converse returns output.message.content as a list of blocks and does not
promise a text block is first. Reasoning-capable models emit a
reasoningContent block ahead of the answer, and toolUse or future block
types can precede it too, but both bedrock call sites indexed position 0:
content", [{}])[0].get("text", "{}")
For those models the default was returned on every call, so _parse_llm_json
saw an empty object, _response_is_hollow reported a hollow result,
finish_reason was rewritten to "length", and the adaptive retry bisected the
chunk. Splitting could not converge because the position assumption fails
identically at every chunk size, and raising GRAPHIFY_MAX_OUTPUT_TOKENS did
nothing because output length was never the constraint. stopReason on those
responses was end_turn, i.e. the model had answered correctly.
Selection now keys on the block's shape rather than its position, at both
_call_bedrock and the bedrock branch of _call_llm. A response whose first
block is already text -- every non-reasoning model today -- is unaffected.
On a 48-document corpus the hollow warnings and the bisection to the
recursion cap disappear, the 17 files previously reported as producing no
nodes are extracted, and output tokens drop from 217,538 to 53,274 as the
wasted retries stop.
Fixes#2287
Zhi Yan Liu
d47f3ea152