Covers both behaviours end to end: a refused outbound URL and an exhausted
budget must skip the request entirely rather than fall through to httpx, the
remaining budget caps each hop's timeout, and an over-ceiling Content-Length
returns 413 without the body being parsed.
Verified against the pre-fix tree: the User-Agent was hardcoded, the endpoints
were literals, check_outbound_url was absent, both hops carried independent
12.0s timeouts, and an oversized declared body returned 422 after parsing
rather than 413 before it.
The post-external-context gate is off unless ODYSSEUS_TOOL_APPROVAL_GATE is
set, but THREAT_MODEL.md described only the untrusted-context wrapper. A reader
auditing the prompt-injection posture would reasonably assume the gate was
active.
State the default, what it blocks when enabled, the two deliberate exemptions,
and note in Known Gaps that the compensating control for the missing shell
sandbox is off by default.
The 256 MiB ceiling was only enforced inside _dump_payload, which runs after
FastAPI has parsed the request and after json.dumps has re-serialised it. By
that point the payload has been materialised several times over, so the limit
rejected an allocation it had already paid for.
Check Content-Length first, on both write routes. A request that omits or lies
about the header still reaches the exact byte count, which remains
authoritative.
The arXiv and OpenAlex title resolvers called two hardcoded endpoints with a
hand-written "Odysseus/0.20" User-Agent, no outbound-URL policy, and a full
12s timeout each. APP_VERSION was already 1.0.3, so the agent string was wrong
the moment it was written, and a scholarly query could hold a user-facing
search open for the sum of all three hops.
Move the endpoints to named constants, build the User-Agent from APP_VERSION,
run both calls through check_outbound_url (they follow redirects, so the final
host is not the one in the constant), and give the whole SearXNG -> OpenAlex ->
arXiv chain one shared wall-clock budget.
The budget is a ContextVar rather than a parameter so the existing test doubles
for _openalex_title_results and _arxiv_title_results keep working unchanged.
Léo