AI Slop Code Risk Monitor

simdjson/simdjson

SlopCodeMonitor badge for simdjson/simdjson Adjusted legacy signal; badge bands: 25 / 50 / 75 (different from dashboard bands).

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

3.6 Low pattern signal View on GitHub

Open-Source Code Quality, Security and Technical Debt Review

This report summarizes scanner evidence for simdjson/simdjson, a C++ project with 24,488 GitHub stars. SynthScan examined 157,803 lines of code across 726 source files, recording 548 pattern matches distributed across 13 syntactic categories. The legacy adjusted pattern signal is 3.6 (Low 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.

3.6
Adjusted Signal
3.6
Raw Pattern Score
100%
Time Factor
2026-10-31
Last Push
24.5K
Stars
C++
Language
157.8K
Lines of Code
726
Files
548
Pattern Hits
2026-10-31
Scan Date
0.00
HC Hit Rate

Risk Review · Payload v1

Use each vector to guide manual verification of the underlying findings.

Payload schema: 1.0.0 · Engine: 2.0.0 · Scoring: heuristic-density-v1 · Scan date: 2026-10-31.

Cognitive Ownership Risk 15.3/100 · LOW

Can maintainers explain intent, assumptions, and trade-offs? 521 finding(s).

Hallucinated Dependency & Supply Chain Risk 0.8/100 · LOW

Are imports declared and package/API names verified? 23 finding(s).

Agent Over-Engineering Ratio 0.4/100 · LOW

Are wrappers, guards, and repeated structures necessary? 7 finding(s).

PR Review Velocity Impact 16.3/100 · LOW

Which changes need focused human review? 548 finding(s).

What These Metrics Mean

Adjusted Signal
Legacy pattern score normalized per 1,000 scanned lines and multiplied by the repository-level time factor. It is not an estimate of AI authorship.
Raw Pattern Score
Sum of severity- and context-weighted pattern findings before applying the time factor.
Time Factor
A coarse multiplier based on repository last-push metadata. It does not identify when individual code was written.
Pattern Hits
Count of configured pattern findings. Review each location and surrounding code before acting.
HC Hit Rate
High- and critical-severity findings per scanned file. Severity is a configured detector weight, not proof of a vulnerability or authorship.
Lines / Files
Scan coverage denominators used by the legacy normalized score.

Pattern-Signal History

This chart tracks the legacy adjusted pattern score across scan runs. Changes can reflect source changes, scan coverage, or detector/scoring versions; they do not measure AI adoption or prove that a team refactored code. Compare runs only when their scoring versions are compatible. The dashed line tracks the raw pattern-hit count.

Severity Breakdown

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.

CRITICAL 0HIGH 2MEDIUM 2LOW 544

Directory Score Breakdown

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.

Pattern Findings

The scanner identified 548 distinct pattern matches across 13 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.

Over-Commented Block496 hits · 482 pts
SeverityFileLineSnippetContext
LOWCMakeLists.txt61# simdjson.h/simdjson.cpp, who never run CMake.COMMENT
LOWbenchmark/benchmarker.h1#ifndef __BENCHMARKER_HCOMMENT
LOWbenchmark/benchmarker.h21#include <chrono>COMMENT
LOWbenchmark/benchmarker.h261 event_collector& collector;COMMENT
LOWbenchmark/bench_number_accessors.cpp1#include <atomic>COMMENT
LOWbenchmark/benchfeatures.cpp1#include <counters/event_counter.h>COMMENT
LOWbenchmark/benchfeatures.cpp21#include <iomanip>COMMENT
LOWbenchmark/bench_ondemand.cpp1#include "simdjson.h"COMMENT
LOWbenchmark/bench_ondemand.cpp21#include <nlohmann/json.hpp>COMMENT
LOWbenchmark/bench_ondemand.cpp41COMMENT
LOWbenchmark/bench_ondemand.cpp61#include "distinct_user_id/simdjson_ondemand_json_pointer.h"COMMENT
LOWbenchmark/bench_ondemand.cpp81#if SIMDJSON_COMPETITION_ONDEMAND_SAJSONCOMMENT
LOWbenchmark/bench_ondemand.cpp101#if SIMDJSON_COMPETITION_SAXCOMMENT
LOWbenchmark/bench_ondemand.cpp121#include "kostya/nlohmann_json.h"COMMENT
LOWbenchmark/bench_ondemand.cpp141#include "large_random/nlohmann_json.h"COMMENT
LOWbenchmark/distinct_user_id/rapidjson_sax.h61#endif // SIMDJSON_COMPETITION_RAPIDJSONCOMMENT
LOW…ecipe_book_benchmark/benchmark_parsing_recipe_book.cpp1#include <cstdio>COMMENT
LOW…eflect/twitter_benchmark/benchmark_parsing_twitter.cpp1#include <cassert>COMMENT
LOW…/twitter_benchmark/benchmark_serialization_twitter.cpp1#include <cassert>COMMENT
LOWbenchmark/static_reflect/serde-benchmark/lib.rs241// FFI Overhead Measurement FunctionsCOMMENT
LOW…log_benchmark/benchmark_serialization_citm_catalog.cpp1#include <cassert>COMMENT
LOW…lect/citm_catalog_benchmark/benchmark_parsing_citm.cpp1#include <cassert>COMMENT
LOWbenchmark/partial_tweets/tweet.h1#pragma onceCOMMENT
LOWbenchmark/dom/perfdiff.cpp1#include <cstdio>COMMENT
LOWbenchmark/dom/parse.cpp1#include <counters/event_counter.h>COMMENT
LOWbenchmark/dom/parse.cpp21#include <iostream>COMMENT
LOWtools/vendor_fast_float.sh1#!/bin/shCOMMENT
LOWtools/vendor_fast_float.sh61// fast_float's bigint comparison is several times quicker than theCOMMENT
LOWtools/minify.cpp1#include <chrono>COMMENT
LOWtools/json2json.cpp1#include <iostream>COMMENT
LOWinclude/simdjson.h41#include "simdjson/simdjson_version.h"COMMENT
LOWinclude/simdjson.h61#include "simdjson/compile_time_json.h"COMMENT
LOWinclude/simdjson/builtin.h1#ifndef SIMDJSON_BUILTIN_HCOMMENT
LOWinclude/simdjson/builtin.h21#elif SIMDJSON_BUILTIN_IMPLEMENTATION_IS(westmere)COMMENT
LOWinclude/simdjson/fallback.h1#ifndef SIMDJSON_FALLBACK_HCOMMENT
LOWinclude/simdjson/dom.h1#ifndef SIMDJSON_DOM_HCOMMENT
LOWinclude/simdjson/dom.h21#include "simdjson/internal/tape_ref-inl.h"COMMENT
LOWinclude/simdjson/ppc64.h1#ifndef SIMDJSON_PPC64_HCOMMENT
LOWinclude/simdjson/annotations.h161inline constexpr detail::is_empty_t is_empty{};COMMENT
LOWinclude/simdjson/annotations.h181// default behaviour is used in that direction.COMMENT
LOWinclude/simdjson/rvv-vls.h1#ifndef SIMDJSON_RVV_VLS_HCOMMENT
LOWinclude/simdjson/haswell.h1#ifndef SIMDJSON_HASWELL_HCOMMENT
LOWinclude/simdjson/convert-inl.h121#endif // SIMDJSON_SUPPORTS_CONCEPTSCOMMENT
LOWinclude/simdjson/icelake.h1#ifndef SIMDJSON_ICELAKE_HCOMMENT
LOWinclude/simdjson/portability.h1#ifndef SIMDJSON_PORTABILITY_HCOMMENT
LOWinclude/simdjson/portability.h41COMMENT
LOWinclude/simdjson/portability.h61COMMENT
LOWinclude/simdjson/portability.h81 // We are not using GCC, so we assume that we can support runtime dispatch for LASX.COMMENT
LOWinclude/simdjson/portability.h101#elif defined(__PPC__) || defined(_M_PPC)COMMENT
LOWinclude/simdjson/portability.h121#define SIMDJSON_STRINGIFY(a,...) SIMDJSON_CAT_IMPLEMENTATION_(a, __VA_ARGS__)COMMENT
LOWinclude/simdjson/portability.h141//COMMENT
LOWinclude/simdjson/portability.h161#endif // defined(SIMDJSON_IS_X86_64) || defined(SIMDJSON_IS_LSX)COMMENT
LOWinclude/simdjson/portability.h181// Lack of compiler optimization may generate high stack usage.COMMENT
LOWinclude/simdjson/portability.h201#define simdjson_pureCOMMENT
LOWinclude/simdjson/portability.h221#define simdjson_strncasecmp _strnicmpCOMMENT
LOWinclude/simdjson/portability.h241#endifCOMMENT
LOWinclude/simdjson/portability.h261#elif defined(__MVS__)COMMENT
LOWinclude/simdjson/portability.h281#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__COMMENT
LOWinclude/simdjson/portability.h301// On Windows the class is disabled by default and must be explicitlyCOMMENT
LOWinclude/simdjson/portability.h321// simply does not exist -- any attempt to use it fails at compile timeCOMMENT
436 more matches not shown…
Fake / Example Data19 hits · 19 pts
SeverityFileLineSnippetContext
LOWbenchmark/benchmark_reflection_usage_compilation.sh322 "name": "John Doe",CODE
LOWbenchmark/benchmark_reflection_usage_compilation.sh327 "street": "123 Main St",CODE
LOWbenchmark/benchmark_reflection_usage_compilation.sh393 "name": "John Doe",CODE
LOWbenchmark/benchmark_reflection_usage_compilation.sh398 "street": "123 Main St",CODE
LOWbenchmark/accessor_performance/accessor_benchmark.h16 "street": "123 Main St",CODE
LOWtests/ondemand/compile_time_json_path_tests.cpp47 "name": "John Doe",CODE
LOWtests/ondemand/compile_time_json_path_tests.cpp58 "street": "123 Main St",CODE
LOWtests/ondemand/compile_time_json_path_tests.cpp133 ASSERT_EQUAL(name, "John Doe");CODE
LOWtests/ondemand/compile_time_json_path_tests.cpp178 ASSERT_EQUAL(street, "123 Main St");CODE
LOWtests/ondemand/compile_time_json_pointer_tests.cpp47 "name": "John Doe",CODE
LOWtests/ondemand/compile_time_json_pointer_tests.cpp96 "street": "123 Main St",CODE
LOWtests/ondemand/compile_time_json_pointer_tests.cpp120 ASSERT_EQUAL(name, "John Doe");CODE
LOWtests/ondemand/compile_time_json_pointer_tests.cpp432 ASSERT_EQUAL(street, "123 Main St");CODE
LOWtests/ondemand/compile_time_json_pointer_tests.cpp527 ASSERT_EQUAL(name, "John Doe");CODE
LOWtests/builder/static_reflection_comprehensive_tests.cpp577 Person person{"John Doe", 30, "john@example.com", std::nullopt};CODE
LOWtests/builder/static_reflection_comprehensive_tests.cpp592 ASSERT_EQUAL(name, "John Doe");CODE
LOWtests/builder/static_reflection_comprehensive_tests.cpp598 Person person{"Jane Smith", 25, "jane@example.com", "555-1234"};CODE
LOWtests/builder/static_reflection_comprehensive_tests.cpp617 ASSERT_EQUAL(phone, "555-1234");CODE
LOWtests/builder/static_reflection_comprehensive_tests.cpp672 Company company{"TechCorp", {"123 Main St", "San Francisco", "94105"}, 500};CODE
Verbosity Indicators7 hits · 15 pts
SeverityFileLineSnippetContext
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h42 // Step 1: Serialize to minified JSONCOMMENT
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h49 // Step 2: Reformat with FracturedJsonCOMMENT
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h73 // Step 1: Extract fields to minified JSONCOMMENT
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h80 // Step 2: Reformat with FracturedJsonCOMMENT
LOW⚡src/to_chars.cpp919 // Step 1: Schubfach multiplier calculation.COMMENT
LOW⚡src/to_chars.cpp928 // Step 2: Try larger divisor; remove trailing zeros if necessary.COMMENT
LOWsrc/to_chars.cpp958 // Step 3: Find the significand with the smaller divisor.COMMENT
Structural Annotation Overuse7 hits · 15 pts
SeverityFileLineSnippetContext
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h42 // Step 1: Serialize to minified JSONCOMMENT
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h49 // Step 2: Reformat with FracturedJsonCOMMENT
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h73 // Step 1: Extract fields to minified JSONCOMMENT
LOW⚡…lude/simdjson/generic/builder/fractured_json_builder.h80 // Step 2: Reformat with FracturedJsonCOMMENT
LOW⚡src/to_chars.cpp919 // Step 1: Schubfach multiplier calculation.COMMENT
LOW⚡src/to_chars.cpp928 // Step 2: Try larger divisor; remove trailing zeros if necessary.COMMENT
LOWsrc/to_chars.cpp958 // Step 3: Find the significand with the smaller divisor.COMMENT
Deep Nesting6 hits · 6 pts
SeverityFileLineSnippetContext
LOWstyle/run-clang-format.py36CODE
LOWstyle/run-clang-format.py163CODE
LOWscripts/detect_nonascii_sourcefiles.py5CODE
LOWsingleheader/amalgamate.py717CODE
LOWsingleheader/amalgamate.py375CODE
LOWsingleheader/amalgamate.py540CODE
Cross-Language Confusion1 hit · 5 pts
SeverityFileLineSnippetContext
HIGHtools/release.py190print("to issue release, enter \n git commit -a && git push && git tag -a v"+toversionstring(*newversion)+" -m \"versiCODE
Empty Error Handlers1 hit · 5 pts
SeverityFileLineSnippetContext
HIGHstyle/run-clang-format.py255except AttributeError:CODE
Decorative Section Separators1 hit · 3 pts
SeverityFileLineSnippetContext
MEDIUMbenchmark/benchmark_reflection_usage_compilation.sh57# ───────────────────────────── BOX-PRINT HELPER ────────────────────────────COMMENT
Unused Imports3 hits · 3 pts
SeverityFileLineSnippetContext
LOWtools/release.py8CODE
LOWstyle/run-clang-format.py11CODE
LOWstyle/run-clang-format.py11CODE
Excessive Try-Catch Wrapping2 hits · 3 pts
SeverityFileLineSnippetContext
LOWstyle/run-clang-format.py97 except Exception as e:CODE
MEDIUMstyle/run-clang-format.py91def run_clang_format_diff_wrapper(args, file):CODE
Hyper-Verbose Identifiers3 hits · 2 pts
SeverityFileLineSnippetContext
LOWstyle/run-clang-format.py91def run_clang_format_diff_wrapper(args, file):CODE
LOWsingleheader/amalgamate.py375 def validate_free_dependency_file(self):STRING
LOWsingleheader/amalgamate.py423 def validate_free_dependency_files(self):STRING
Redundant / Tautological Comments1 hit · 2 pts
SeverityFileLineSnippetContext
LOWbenchmark/benchmark_reflection_usage_compilation.sh167# Check if we found a working compilerCOMMENT
Slop Phrases1 hit · 2 pts
SeverityFileLineSnippetContext
LOWfuzz/ossfuzz.sh9# make sure to exit on problemsCOMMENT