Marius Ciepluch and Claude Opus 5.5
3ffb8b4c54
fix(hunter): ask for the final answer in plain text; DeepSeek's JSON mode lost it
...
The final-answer turn requested the provider's JSON mode with the tools still
attached. DeepSeek (deepseek-flash) then answered with the format itself
(`{"type": "json_object"}`), wrapped the array (`{"type": "json_object",
"value": [...]}`), or emitted its tool-call markup as text. A hunt that had found
the vulnerability reported nothing.
Measured on the v2 sink verifier with the declared vulnerable functions: 0 of 7
confirmed in JSON mode, 5 of 7 asked plainly (6 of 7 at 8 steps). The model named
Medplum's actual redirect-URI prefix-match bug, LMDeploy's redirect bypass of
_is_safe_url, and ContextForge's unsandboxed Jinja2.
The final turn is now plain text without tools. The parser also reads a
`{"value": [...]}` wrapper. Two tests that pinned JSON mode now pin the plain
turn, and a new test reproduces the wrapped answer.
Invalidates as measurements: the hunter experiment on v2 (c4a0bd8 ) and the first
sink-verifier run. Both used this turn.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected] >
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo
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