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Only load the taint store when there is something to mark #222

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Only load the taint store when there is something to mark #222

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13 changes: 10 additions & 3 deletions prismor/runtime/policy_engine.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1104,12 +1104,19 @@ def evaluate(
# If this event produced any prompt_injection findings, persist that
# fact so subsequent network events can be escalated regardless of
# their destination.
taint = self._get_taint(session_id)
if taint is not None and any(
# Test the cheap condition first: _get_taint() reads the session's
# taint file from disk, so loading it unconditionally paid a file read
# on every event, while only events carrying a prompt-injection finding
# ever mark. Left None otherwise — the network block below lazily loads
# it on its own when it needs it.
taint = None
if any(
f.get("category") in ("prompt_injection", "prompt_injection_semantic")
for f in findings
):
taint.mark_injection(index)
taint = self._get_taint(session_id)
if taint is not None:
taint.mark_injection(index)

# ── Network event: cloaking-secret check + taint escalation ───────
if event_type == "network":
Expand Down