Fastest and cheapest web agent
This report summarizes scanner evidence for browser-use/jev-ultrafast, a Python project with 22,628 GitHub stars. SynthScan examined 5,185 lines of code across 31 source files, recording 50 pattern matches distributed across 8 syntactic categories. The legacy adjusted pattern signal is 27.7 (Elevated pattern signal); it is not an authorship estimate.
Use the findings to ask whether maintainers can explain intent, verify dependencies, simplify unnecessary scaffolding, and focus review effort. Risk Payload v1 adds ownership, supply-chain, over-engineering, and review-effort vectors when available. These are prompts for human verification, not probabilities, security findings, or measured maintenance costs.
Use each vector to guide manual verification of the underlying findings.
Can maintainers explain intent, assumptions, and trade-offs? 24 finding(s).
Are imports declared and package/API names verified? 17 finding(s).
Are wrappers, guards, and repeated structures necessary? 28 finding(s).
Which changes need focused human review? 50 finding(s).
Run additional scans to build a history of the legacy pattern signal. Score changes are not a measure of AI adoption or code quality.
Groups findings by configured severity weight. Severity is not a confidence estimate, security rating, or proof that a package is missing. Verify imports against the project's manifests and inspect each finding in its local design context.
This horizontal bar chart shows where configured pattern scores accumulate across directories. Treat the bars as locations to inspect, not as evidence of authorship or code quality. Use the file-level findings to decide whether a directory needs a focused ownership, dependency, complexity, or review check.
The scanner identified 50 distinct pattern matches across 8 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a detector match to inspect in context. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the configured finding weight (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — legacy comment-context matches receive a ×1.5 score weight. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier under the legacy scoring model.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH⚡ | tests/test_agent.py | 306 | "content", ["Thinking: Zurich", '{"text":null}', '{"text":"Zurich","extra":true}', '{"text":123}'] | CODE |
| HIGH | jev_ultrafast/questions.py | 24 | If a required value is missing, return {"text": null}. Otherwise return {"text": "the field value"}.""" | CODE |
| HIGH | jev_ultrafast/browser.py | 14 | MARKER = f"(() => {{ const state={READ_STATE}; return state?.marker ?? null; }})()" | CODE |
| HIGH | jev_ultrafast/browser.py | 63 | if (++frames>=2 && (!autocomplete || options.some(e=>{ | CODE |
| HIGH | jev_ultrafast/browser.py | 65 | return r.width && r.height && r.bottom>0 && r.top<innerHeight && | CODE |
| HIGH | jev_ultrafast/browser.py | 95 | f"return c ? [c.pageKey(),c.guard(c.nodes.get({node}))] : null; }})()" | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 146 | if (!e?.isConnected || e.matches(':disabled') || e.closest('[aria-disabled="true"],[inert]') || | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 147 | !e.checkVisibility({checkOpacity:true,checkVisibilityCSS:true})) return null; | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 148 | if (action.kind==='fill' && (e.readOnly || e.getAttribute('aria-readonly')==='true')) return null; | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 148 | if (action.kind==='fill' && (e.readOnly || e.getAttribute('aria-readonly')==='true')) return null; | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 150 | if (!r.width || !r.height || x<0 || y<0 || x>=innerWidth || y>=innerHeight) return null; | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 150 | if (!r.width || !r.height || x<0 || y<0 || x>=innerWidth || y>=innerHeight) return null; | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 151 | if (!e.contains(document.elementFromPoint(x,y))) return null; | CODE |
| HIGH⚡ | jev_ultrafast/browser.py | 154 | !o.disabled && !o.closest('optgroup[disabled]'))) return null; | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW⚡ | tests/test_agent.py | 214 | def test_loading_waits_do_not_trigger_no_progress_stop(runner): | CODE |
| LOW⚡ | tests/test_agent.py | 221 | def test_stale_observation_preserves_executed_action(runner): | CODE |
| LOW⚡ | tests/test_agent.py | 230 | def test_observation_is_one_atomic_browser_read(monkeypatch): | CODE |
| LOW⚡ | tests/test_agent.py | 308 | def test_text_helper_rejects_invalid_values(monkeypatch, content): | CODE |
| LOW⚡ | tests/test_agent.py | 315 | def test_navigation_during_prediction_reobserves_without_action(runner): | CODE |
| LOW | tests/test_agent.py | 49 | def test_invalid_choice_is_rejected(mutation): | CODE |
| LOW | tests/test_agent.py | 67 | def test_one_index_per_node_with_operation_specific_targets(): | CODE |
| LOW | tests/test_agent.py | 77 | def test_all_heads_are_one_request_and_only_matching_head_executes(monkeypatch): | CODE |
| LOW | tests/test_agent.py | 99 | def test_click_cannot_consume_a_text_target(monkeypatch): | CODE |
| LOW | tests/test_agent.py | 116 | def test_target_head_receives_control_state_and_full_next_step_rules(monkeypatch): | CODE |
| LOW | tests/test_agent.py | 143 | def test_quoted_task_text_still_uses_the_llm(monkeypatch): | CODE |
| LOW | tests/test_agent.py | 154 | def test_missing_text_credential_stops_before_guessing(monkeypatch): | CODE |
| LOW | tests/test_agent.py | 181 | def test_stale_decision_is_consumed_before_any_mutation(runner): | CODE |
| LOW | tests/test_agent.py | 189 | def test_generated_text_reused_only_for_identical_retry_context(runner, monkeypatch): | CODE |
| LOW | tests/test_agent.py | 202 | def test_changed_field_context_does_not_reuse_generated_text(runner, monkeypatch): | CODE |
| LOW | tests/test_agent.py | 242 | def test_executor_rejects_a_stale_page_before_browser_input(monkeypatch): | CODE |
| LOW | tests/test_agent.py | 255 | def test_interrupted_dropdown_mutation_cannot_be_retried_as_stale(monkeypatch, response): | CODE |
| LOW | tests/test_agent.py | 270 | def test_fingerprint_tracks_values_and_identity_not_screenshots(): | CODE |
| LOW | tests/test_agent.py | 280 | def test_flight_verification_rejects_wrong_trip(changed): | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | jev_ultrafast/browser.py | 75 | except RuntimeError: | CODE |
| HIGH | jev_ultrafast/demo.py | 138 | except KeyboardInterrupt: | CODE |
| HIGH | scripts/check_guards.py | 63 | except (RuntimeError, StalePage): | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | jev_ultrafast/agent.py | 24 | except Exception: | CODE |
| LOW | jev_ultrafast/demo.py | 122 | except Exception: | CODE |
| LOW | scripts/record_flights.py | 47 | except Exception as e: | CODE |
| MEDIUM | scripts/record_flights.py | 36 | def capture(): | CODE |
| LOW | scripts/measure_flights.py | 50 | except Exception as exc: | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | tests/test_agent.py | 49 | CODE | |
| LOW | jev_ultrafast/browser.py | 120 | CODE | |
| LOW | jev_ultrafast/agent.py | 52 | CODE | |
| LOW | scripts/record_flights.py | 36 | CODE | |
| LOW | scripts/smoke.py | 17 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | jev_ultrafast/__init__.py | 3 | CODE | |
| LOW | jev_ultrafast/__init__.py | 4 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | jev_ultrafast/__init__.py | 6 | __all__ = ["Agent", "Browser"] | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | jev_ultrafast/snapshot.js | 22 | e.getAttribute('title') || e.getAttribute('placeholder') || ''; | CODE |