Outcome: done
Changed: tests/test_api.py:1-96
Verified by: `make verify` — passed (compileall src/tests/app, 31 unittest tests OK)
Findings: tests/test_api.py:1-96 written — 15 tests covering all 4 endpoints (add, subtract, clamp, clamp_to_byte) with success cases, missing-param failures, invalid-type failures, and boundary conditions (clamp low>high, clamp_to_byte above 255). All use Flask test client. make verify passes with 31 tests total.
Open: none
Confidence: high — all acceptance criteria met; each endpoint has ≥1 success test and ≥1 failure test; Flask test client used without a running server; tests follow the `# retoor` header convention in tests/; `make verify` confirmed passing.
Typosaurus-Run: b3f34882127d437e93c240def12065ad
Typosaurus-Node: 045e88c491a9472ea4d6e41b0ebb7d45
Typosaurus-Agent: @sveta
Refs: #9
