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MessagePack-CSharp/MessagePack-CSharp

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

Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]

2.2 Low pattern signal View on GitHub

Open-Source Code Quality, Security and Technical Debt Review

This report summarizes scanner evidence for MessagePack-CSharp/MessagePack-CSharp, a C# project with 6,810 GitHub stars. SynthScan examined 102,037 lines of code across 758 source files, recording 175 pattern matches distributed across 5 syntactic categories. The legacy adjusted pattern signal is 2.2 (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.

2.2
Adjusted Signal
2.2
Raw Pattern Score
100%
Time Factor
2026-10-30
Last Push
6.8K
Stars
C#
Language
102.0K
Lines of Code
758
Files
175
Pattern Hits
2026-10-31
Scan Date
0.01
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 9.8/100 · LOW

Can maintainers explain intent, assumptions, and trade-offs? 170 finding(s).

Hallucinated Dependency & Supply Chain Risk 0.7/100 · LOW

Are imports declared and package/API names verified? 5 finding(s).

Agent Over-Engineering Ratio 0.0/100 · LOW

Are wrappers, guards, and repeated structures necessary? 0 finding(s).

PR Review Velocity Impact 10.0/100 · LOW

Which changes need focused human review? 175 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 1HIGH 6MEDIUM 0LOW 168

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 175 distinct pattern matches across 5 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 Block162 hits · 162 pts
SeverityFileLineSnippetContext
LOW…ark/SerializerBenchmark/Serializers/HagarSerializer.cs1// Copyright (c) All contributors. All rights reserved.COMMENT
LOW…ark/SerializerBenchmark/Serializers/HagarSerializer.cs21//// .AddSerializers(typeof(Hagar_).Assembly) // this assemblyCOMMENT
LOW…ark/SerializerBenchmark/Serializers/HagarSerializer.cs41//// }COMMENT
LOWtests/MessagePack.Tests/ByteArrayStringHashTableTest.cs21COMMENT
LOWtests/MessagePack.Tests/ByteArrayStringHashTableTest.cs41COMMENT
LOWtests/MessagePack.Tests/NewGuidFormatterTest.cs21 ////{COMMENT
LOWsandbox/DynamicCodeDumper/Program.cs41 ////DynamicObjectResolver.Instance.GetFormatter<Version1>();COMMENT
LOWsandbox/DynamicCodeDumper/Program.cs381 //// {COMMENT
LOWsandbox/DynamicCodeDumper/Program.cs401COMMENT
LOWsandbox/DynamicCodeDumper/Program.cs421 //// }COMMENT
LOWsandbox/DynamicCodeDumper/Program.cs441 //// }COMMENT
LOW…ck.Experimental/HardwareIntrinsics/FormatterHelpers.cs121 Sse2.MaskMove(src, mask, dest);COMMENT
LOWsrc/MessagePack.Annotations/AnalyzerAttributes.cs1// Copyright (c) All contributors. All rights reserved.COMMENT
LOWsrc/MessagePack.Annotations/Attributes.cs21 /// </summary>COMMENT
LOWsrc/MessagePack.Annotations/Attributes.cs41 /// will generate a formatter at runtime instead.COMMENT
LOWsrc/MessagePack.Annotations/Attributes.cs81 }COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs41 /// <summary>COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs141 return true;COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs181 /// <param name="bytesWritten">The number of bytes required to write the value, whether successful or not.</param>COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs201COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs241 case >= sbyte.MinValue: return TryWriteInt8(destination, unchecked((sbyte)value), out bytesWritten);COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs341 return true;COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs361 {COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs401 /// <param name="bytesWritten">The number of bytes required to write the value, whether successful or not.</param>COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs421 }COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs481 default:COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs521 return TryWriteUInt16(destination, unchecked((ushort)value), out bytesWritten);COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs581COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs601 }COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs661 /// Writes a double-precision floating-point value to the specified buffer, if the buffer is large enough.COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs701 return false;COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs721 public static bool TryWrite(Span<byte> destination, char value, out int bytesWritten) => TryWrite(destination, (ushoCOMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs881 destination[0] = MessagePackCode.Bin32;COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs941 return false;COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs1021 }COMMENT
LOWsrc/MessagePack/MessagePackPrimitives.Writers.cs1141COMMENT
LOWsrc/MessagePack/MessagePackSerializerOptions.cs101 /// </summary>COMMENT
LOWsrc/MessagePack/MessagePackSerializerOptions.cs121 /// </summary>COMMENT
LOWsrc/MessagePack/MessagePackSerializerOptions.cs141 public bool? OldSpec { get; private set; }COMMENT
LOWsrc/MessagePack/MessagePackSerializerOptions.cs181 {COMMENT
LOWsrc/MessagePack/MessagePackSerializerOptions.cs401 /// <exception cref="TypeAccessException">Thrown if the <paramref name="type"/> is not allowed to be deserializeCOMMENT
LOWsrc/MessagePack/BufferWriter.cs21 /// </summary>COMMENT
LOWsrc/MessagePack/MessagePackSerializer+Typeless.cs21 {COMMENT
LOWsrc/MessagePack/MessagePackStreamReader.cs61 this.sequenceRental = sequencePool.Rent();COMMENT
LOWsrc/MessagePack/SequenceReader.cs21 private bool usingSequence;COMMENT
LOWsrc/MessagePack/CompositeResolverAttribute.cs21 /// </summary>COMMENT
LOWsrc/MessagePack/MessagePackSerializer.cs21 private static MessagePackSerializerOptions? defaultOptions;COMMENT
LOWsrc/MessagePack/MessagePackSerializer.cs41 /// <summary>COMMENT
LOWsrc/MessagePack/MessagePackSerializer.cs201 /// </summary>COMMENT
LOWsrc/MessagePack/MessagePackSerializer.cs261 /// <typeparam name="T">The type of value to deserialize.</typeparam>COMMENT
LOWsrc/MessagePack/MessagePackSerializer.cs281 /// <param name="bytesRead">The number of bytes read.</param>COMMENT
LOWsrc/MessagePack/MessagePackSerializer.cs301 CancellationToken = cancellationToken,COMMENT
LOWsrc/MessagePack/MessagePackSerializer.cs361 /// <param name="stream">COMMENT
LOWsrc/MessagePack/MessagePackWriter.cs81 /// <summary>COMMENT
LOWsrc/MessagePack/MessagePackWriter.cs121 /// <see cref="MessagePackCode.Array16"/>, orCOMMENT
LOWsrc/MessagePack/MessagePackWriter.cs141COMMENT
LOWsrc/MessagePack/MessagePackWriter.cs221COMMENT
LOWsrc/MessagePack/MessagePackWriter.cs301 Span<byte> span = this.writer.GetSpan(5);COMMENT
LOWsrc/MessagePack/MessagePackWriter.cs341 /// <see cref="MessagePackCode.UInt64"/>,COMMENT
LOWsrc/MessagePack/MessagePackWriter.cs481 this.WriteBinHeader(length);COMMENT
102 more matches not shown…
Synthetic Comment Markers6 hits · 45 pts
SeverityFileLineSnippetContext
HIGH…essagePack.SourceGenerator/Transforms/UnionTemplate.cs3// This code was generated by a tool.COMMENT
HIGH…gePack.SourceGenerator/Transforms/FormatterTemplate.cs3// This code was generated by a tool.COMMENT
HIGH…ourceGenerator/Transforms/CompositeResolverTemplate.cs3// This code was generated by a tool.COMMENT
HIGH…MessagePack.SourceGenerator/Transforms/EnumTemplate.cs3// This code was generated by a tool.COMMENT
HIGH…agePack.SourceGenerator/Transforms/ResolverTemplate.cs3// This code was generated by a tool.COMMENT
HIGH…tor/Transforms/StringKey/StringKeyFormatterTemplate.cs3// This code was generated by a tool.COMMENT
Hallucination Indicators1 hit · 10 pts
SeverityFileLineSnippetContext
CRITICALsrc/MessagePack/MessagePackWriter.cs729 byte[] result = this.writer.SequenceRental.Value.AsReadOnlySequence.ToArray();CODE
Fake / Example Data4 hits · 4 pts
SeverityFileLineSnippetContext
LOW…etCoreMvcFormatter.Tests/AspNetCoreMvcFormatterTest.cs43 Description = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididuntCODE
LOW…etCoreMvcFormatter.Tests/AspNetCoreMvcFormatterTest.cs43 Description = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididuntCODE
LOW…etCoreMvcFormatter.Tests/AspNetCoreMvcFormatterTest.cs119 Description = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididuntCODE
LOW…etCoreMvcFormatter.Tests/AspNetCoreMvcFormatterTest.cs119 Description = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididuntCODE
Redundant / Tautological Comments2 hits · 3 pts
SeverityFileLineSnippetContext
LOW.github/workflows/_clean-packagejson-branch.yaml27 # Check if the branch is the default branchCOMMENT
LOW.github/workflows/_clean-packagejson-branch.yaml33 # Check if the branch is created by github-actions[bot]COMMENT