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Introduce a pre-execution safety layer that reviews effectful agent actions against compiled, frozen evidence before they run. `--safety-mode guarded` allows non-destructive interaction after review; `--safety-mode observe` permits passive target interaction only. `off` stays the default, so existing runs are unchanged. Deterministic rules decide what they can on their own: destructive commands, code-loading environment overrides, blocked browser actions, and mutating requests in observe mode are refused without a model call, and a small set of read-only commands is allowed outright. Everything else compiles an evidence packet — command, scope, script source and its local import closure, prior tool-call evidence, and browser snapshot context — for a bounded reviewer that may make one isolated inspection call. Incomplete evidence fails closed. In safety modes, user-owned local directories are copied into the run directory so the originals are never mounted writable, while `.git`, `.agents`, and `.codex` inside the copy stay read-only. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>