[Leaderboard] Sentinel (Actioneer) — Fable 5 + Opus 4.7 fallback — 84.50% Pass@1

[Suraj-gameramp]

Sentinel (Actioneer) — Leaderboard Submission

Agent name: Sentinel
Team: Actioneer
Backbone LLM: Claude Fable-5 (primary); Claude Opus 4.7 on the 3 PANCANCER_ATLAS queries (Fable-5 declines that clinical-genomics domain)
Hints: Yes (db_description_withhint.txt folded into guidelines)
Trials: 5 per query (270 cells)
Stratified Pass@1: 84.50%

Architecture

Sentinel is a single-agent ReAct executor operating a persistent, sandboxed Python REPL over each task's provided databases (SQLite / DuckDB / PostgreSQL / MongoDB). It adds a deterministic verify_step assertion layer — non-LLM checks (row-count, uniqueness, non-null, dtype, value-range) that the agent invokes on its own intermediate results before finalizing. All data access is restricted to the sanctioned stores for each task.

Results

Dataset	Pass@1
bookreview	1.00
googlelocal	1.00
music_brainz_20k	1.00
PATENTS	1.00
stockindex	1.00
stockmarket	1.00
yelp	1.00
crmarenapro	0.92
PANCANCER_ATLAS	0.67
agnews	0.55
DEPS_DEV_V1	0.50
GITHUB_REPOS	0.50
Stratified Pass@1	0.8450

Notes

• 270 entries (54 queries × 5 trials), validated against the official DAB per-query validate.py; submission answers match the corresponding traces.
• Integrity (per SUBMISSION_RUBRIC.md §2). Answers come solely from the agent's analysis of the sanctioned stores. Every REPL ran under a kernel-level sandbox: deny-by-default over $HOME, all network egress blocked, ML dataset caches (huggingface / torch / kaggle / keras) denied. Trace audit over the full tool-call surface: 0 reads of validate.py / ground_truth.csv / queries.json / other-run artifacts.
• Disclosure. The agnews traces show the executor attempting external label fetches (load_dataset("ag_news"), raw.githubusercontent, HuggingFace cache). Every attempt was sandbox-blocked — 0 bytes retrieved — so no off-limits data was obtained and none drove any answer (consistent with §2.1's "actually obtained and drove the passing answer" standard). No other dataset attempted an external fetch.
• Submission file: leaderboard_submissions/actioneer_sentinel.json
• Execution traces (all 270 runs): actioneer_sentinel_traces.tar.gz