Three faults in the graph tool, all on the agent's path:
The store was cached on the tool, and the executor caches the tool for the
whole agent run -- so one pgvector pooled connection stayed checked out across
every LLM round trip of that run, minutes at a time, and enough concurrent
runs exhaust the pool. GraphRAGRetriever releases its store before falling
back for this reason. The tool now releases it at the end of each action.
It gated on GRAPHRAG_ENABLED where everything else asks graphrag_available(),
which also requires the pgvector store. Under any other vector store the graph
tables are not the ones the sources were ingested into, but the tool was still
offered and still queried Postgres.
Pages were labelled by hand rather than through labels_from_metadata, which
exists so citation labels match across retrievers. A page read by the tool and
the same chunk retrieved by internal_search are one document, and citations
key on (source, title) -- so the research agent gave that document two
citation numbers. The recorded doc also keeps the full chunk text now, so it
dedupes against the retriever's copy; only what the model reads is truncated.
Alex
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