DST-02　Write outside project root

block 28 hits here sandbox-verified

① What it stops

Agent attempted to write to a file outside the project root directory

Allow: run `antinel paths add <prefix>` (audited) or `antinel roots add <dir>`; or keep agent writes inside the project.

② Criteria

Item	Value
Severity	critical
Category	destructive
Gate	Gate 4 behavior (destructive/persistence)
Criterion type	tool_call
Applies to	Write、Edit

Command patterns

\btar\b[^\n]{0,120}-C\s+/(?:\s|$)
\btar\b[^\n]{0,120}\s-C\s+/(?:etc|usr|bin|sbin|var|lib|boot|srv|opt|home|root)(?:\s|$)

Generated directly from rules/default.json — never hand-written or paraphrased.

③ Real hits

2026-09-24T01:44:10+08:00 ✗ block [DST-02] tool: Write　exit code: 2 criterion: path_outside_project_root hit: C:\Temp\PGINST~1\probe_rules_9timmy02\outside\escape.txt

Triggered in a disposable sandbox project using the real hooks/pre_tool_use.py — the same method as challenge/generate_challenge.py. All 24 rules verified this way (24/24).

Daily ledger on this machine: 28 hits

2026-09-10T09:52:17+08:00 ✗ blocked [DST-02] tool: Write　host: zcode criterion: path_outside_project_root D:\psl\poc\_antinel_selftest\inspect_rollout.py

④ False positives & exemptions

Built-in exclude patterns are listed under ②. Four exemption mechanisms exist globally (declared workspace roots, policy path whitelist, path-suspect alert-only, exclude patterns); counts on this machine are published on the Chinese page and in Limits.

⑤ Boundaries

Boundary
Criterion type	tool_call
Applies to	Write、Edit
Platform	all platforms
Case sensitivity	Measured: insensitive (`RM -RF` is blocked like `rm -rf`)
Path normalisation	Measured: effective (`./sub/../.env` is blocked)
Scripts not parsed	An absolute path outside the project mentioned in a Bash command is alerted, not blocked — `scripts are not parsed (THREAT_MODEL Non-goals)`
Failure posture	fail-open; best-effort, not a hard security boundary

⑥ Reproduce

grep -h "DST-02" .psl/audit/*.jsonl | head python challenge/generate_challenge.py python challenge/verify.py

Cite this page

Antinel AgentState. DST-02 Write outside project root — rule detail. https://antinel.com/en/agentstate/rules/DST-02/ (accessed YYYY-MM-DD)

Antinel. (2026). DST-02 Write outside project root — rule detail. AgentState. https://antinel.com/en/agentstate/rules/DST-02/

BibTeX

@misc{antinel_en_agentstate_rules_DST_02,
  title        = {DST-02 Write outside project root — rule detail},
  author       = {{Antinel}},
  year         = {2026},
  url          = {https://antinel.com/en/agentstate/rules/DST-02/},
  note         = {claim tier: measured}
}

Claim tier: measured　采集时刻：2026-09-23T22:41:18+08:00