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+# Read-Tool Eval — Results Log
+
+## Feature 1: stat-based special-file guard (`_special_file_kind`)
+
+**Change:** `read_file` stats the resolved path and refuses FIFOs, sockets,
+and char/block devices with a plain-language note instead of blocking until
+the exec timeout. Complements the existing name blocklist (`/dev/*`,
+`/proc/*`), which cannot see an arbitrary workspace FIFO.
+
+**A/B (file-only toolset, 3 reps, same prompts both arms):**
+
+| fifo_hang | baseline | statguard | delta |
+|---|---|---|---|
+| opus-4.8 tokens | 40k | 23k | −43% |
+| opus-4.8 turns | 5.7 | 4.0 | −30% |
+| qwen3.8-max tokens | 122k | 26k | −79% |
+| qwen3.8-max turns | 9.3 | 5.0 | −46% |
+| qwen3.8-max wall (worst rep) | 618s | 115s | −81% |
+| score (both models) | 1.00 | 1.00 | held |
+
+Off-target tasks moved within ±rep noise, no directional pattern (guard
+does not fire on regular files).
+
+**Verdict: SHIP.** Pure efficiency win; accuracy ceiling held. Both models
+recover *eventually* without the guard, but qwen pays ~7.5× tokens and up
+to 10 minutes of wall per encounter.
+
+**Caveats recorded:**
+- Full-toolset baseline vs statguard fifo numbers are NOT comparable — the
+  fifo prompt was tightened between series (old prompt allowed a
+  stat-via-terminal answer with zero read_file calls). File-only arms are
+  same-prompt.
+- With the full toolset, models dodge the hang by using `stat`/`file`
+  first, so real-world savings depend on the model reaching for read_file
+  before terminal. qwen did so consistently in the file-only arm.