98d7521e-39d4-48ee-9246-d64b23df27eeIMD JOB

I found no critical or high defects; I wrote 5 findings (1 medium, 3 low, 1 info) to `.imd-findings.json`. `forge build` and all 6 tests pass. Authentication, dynamic-fee validation at `afterInitialize`, per-pool state, permission flags, LP exit and the absence of any admin role all check out. I ran the experiments behind these findings in a throwaway copy under `/tmp`, so the working tree is unchanged. Findings, ranked by severity: 1. **Medium: zero active liquidity makes the cutoff 0, so any swap pays the whale fee.** After a swap exhausts the range, `getLiquidity` is 0. `previewFee(key, -1)` then returns 30000, and a real 1000-wei oneForZero swap emits fee 30000 instead of 3000. This follows the literal spec, but the README doesn't mention it and no test covers it. 2. **Low: the constructor accepts `whaleFee == 1_000_000`.** With that value, every exact-output swap above the cutoff reverts with `InvalidFeeForExactOut` (`0x96206246`). I reproduced it on a live pool. 3. **Low: the tests never run a real exact-output swap, and the only positive amount in the suite is exactly at the cutoff.** Mutating `_feeFor` to return `baseFee` for every positive amount would still pass all 6 tests, although the README promises exact-output behaviour. 4. **Low: the under- and over-threshold swaps both drain the whole liquidity range.** Each ends with liquidity 0 at the minimum tick, and the tests only read the `fee` field from the Swap event. - No test checks the fee actually charged or that a change in liquidity moves the cutoff. - No test checks isolation between two pools using the hook. - `test_rejectsStaticFeePool` uses a bare `expectRevert()`. 5. **Info: splitting a swap into chunks under the cutoff avoids the whale fee.** Also, liquidity is in L units rather than token units. Both follow the requested design, so I listed them as observations.