AI Slop Code Risk Monitor

nim-lang/Nim

Name: nim-lang/Nim — Nim Code Quality & Security Review | AI Slop Code Risk Monitor
Creator: AI Slop Code Risk Monitor

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

Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority).

1.4 Low pattern signal View on GitHub

Open-Source Code Quality, Security and Technical Debt Review

This report summarizes scanner evidence for nim-lang/Nim, a Nim project with 18,294 GitHub stars. SynthScan examined 50,441 lines of code across 246 source files, recording 60 pattern matches distributed across 10 syntactic categories. The legacy adjusted pattern signal is 1.4 (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.

1.4

Adjusted Signal

1.4

Raw Pattern Score

100%

Time Factor

2026-10-31

Last Push

18.3K

Stars

Nim

Language

50.4K

Lines of Code

246

Files

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 5.0/100 · LOW

Can maintainers explain intent, assumptions, and trade-offs? 51 finding(s).

Hallucinated Dependency & Supply Chain Risk 0.5/100 · LOW

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

Agent Over-Engineering Ratio 1.6/100 · LOW

Are wrappers, guards, and repeated structures necessary? 8 finding(s).

PR Review Velocity Impact 6.7/100 · LOW

Which changes need focused human review? 60 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 0LOW 58

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 60 distinct pattern matches across 10 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 Block36 hits · 34 pts

Severity	File	Line	Snippet	Context
LOW	config/nim.cfg	261	@if vxworks:	COMMENT
LOW	config/nimdoc.cfg	41	</ul>	COMMENT
LOW	config/nimdoc.cfg	81	# See doc.item for available substitution variables.	COMMENT
LOW	tests/manyloc/packages/noconflicts.nim.cfg	1	# Mark noconflicts as project file	COMMENT
LOW	tests/compiler/nim.cfg	1	# note: consider moving tests/compilerapi/ to tests/compiler/ since	COMMENT
LOW	lib/nimbase.h	41	*/	COMMENT
LOW	lib/nimbase.h	61	# pragma GCC diagnostic ignored "-Wunused-variable"	COMMENT
LOW	lib/nimbase.h	81	#endif	COMMENT
LOW	lib/nimbase.h	101	#else /* others are less picky: */	COMMENT
LOW	lib/nimbase.h	121	# define NIM_THREADVAR __thread	COMMENT
LOW	lib/nimbase.h	141	#if defined(__cplusplus)	COMMENT
LOW	lib/nimbase.h	161	/* ------------------------------------------------------------------- */	COMMENT
LOW	lib/nimbase.h	181	# define N_THISCALL_PTR(rettype, name) rettype (__thiscall *name)	COMMENT
LOW	lib/nimbase.h	201	# define N_CDECL_PTR(rettype, name) rettype (*name)	COMMENT
LOW	lib/nimbase.h	221	# define N_LIB_EXPORT_VAR __attribute__((visibility("default"), used))	COMMENT
LOW	lib/nimbase.h	241	#define N_NOINLINE_PTR(rettype, name) rettype (*name)	COMMENT
LOW	lib/nimbase.h	261	#define N_CLOSURE_PTR(rettype, name) N_NIMCALL_PTR(rettype, name)	COMMENT
LOW	lib/nimbase.h	281	#define NIM_STATIC_ASSERT(x, msg) _NIM_STATIC_ASSERT_STAGE_2(x,__LINE__)	COMMENT
LOW	lib/nimbase.h	301	#endif	COMMENT
LOW	lib/nimbase.h	321	#define NIM_BOOL bool	COMMENT
LOW	lib/nimbase.h	341	# else	COMMENT
LOW	lib/nimbase.h	401	#ifdef __INT32_TYPE__	COMMENT
LOW	lib/nimbase.h	421	#endif	COMMENT
LOW	lib/nimbase.h	441	# elif NIM_INTBITS == 16	COMMENT
LOW	lib/nimbase.h	481	/* declared size of a sequence/variable length array: */	COMMENT
LOW	lib/nimbase.h	501	# define NAN (__builtin_nanf(""))	COMMENT
LOW	lib/nimbase.h	541	# define NIM_LIKELY(x) __builtin_expect(x, 1)	COMMENT
LOW	lib/nimbase.h	561		COMMENT
LOW	lib/nimbase.h	581	# include <sys/types.h>	COMMENT
LOW	lib/nimbase.h	601	#if ((defined(__arm__) && !defined(__unix__)) \|\| defined(__riscv) \|\| (defined(__xtensa__) && !defined(__unix__))) &&	COMMENT
LOW	lib/cycle.h	81	#if TIME_WITH_SYS_TIME	COMMENT
LOW	lib/wrappers/linenoise/linenoise.c	101	* Sequence: ESC [ 2 J	COMMENT
LOW	doc/testament.md	121	action: "run"	COMMENT
LOW	doc/testament.md	161	# Error message the test should print, if any.	COMMENT
LOW	doc/advopt.txt	1	Advanced commands:	COMMENT
LOW	doc/tut3.md	141	# output:	COMMENT

Empty Error Handlers2 hits · 10 pts

Severity	File	Line	Snippet	Context
HIGH	tools/debug/nim-gdb.py	63	except:	CODE
HIGH	lib/pure/unidecode/gen.py	11	except ImportError:	CODE

Redundant / Tautological Comments6 hits · 9 pts

Severity	File	Line	Snippet	Context
LOW	tools/debug/nimlldb.py	78	# Check if data pointer is Null	COMMENT
LOW	tools/debug/nimlldb.py	92	# Check if first element is NULL	COMMENT
LOW	tools/debug/nimlldb.py	109	# Check if data pointer is Null	COMMENT
LOW	tools/debug/nimlldb.py	121	# Check if first element is NULL	COMMENT
LOW	tools/debug/nimlldb.py	514	# Check if first element is NULL	COMMENT
LOW	tools/debug/nimlldb.py	531	# Check if first element is NULL	COMMENT

Deep Nesting4 hits · 4 pts

Severity	File	Line	Context
LOW	tools/debug/nim-gdb.py	98	CODE
LOW	tools/debug/nim-gdb.py	240	CODE
LOW	tools/debug/nimlldb.py	792	CODE
LOW	tools/debug/nimlldb.py	763	CODE

Unused Imports3 hits · 3 pts

Severity	File	Line	Context
LOW	tools/debug/nim-gdb.py	4	CODE
LOW	tools/debug/nim-gdb.py	5	CODE
LOW	tests/untestable/gdb/gdb_pretty_printer_test.py	3	CODE

Excessive Try-Catch Wrapping2 hits · 2 pts

Severity	File	Line	Snippet	Context
LOW	tools/debug/nim-gdb.py	16	except Exception as e:	CODE
LOW	tools/debug/nim-gdb.py	687	except Exception as e:	CODE

Hyper-Verbose Identifiers2 hits · 2 pts

Severity	File	Line	Snippet	Context
LOW	tools/debug/nim-gdb.py	692	def register_nim_pretty_printers_for_object(objfile):	CODE
LOW	tools/debug/nimlldb.py	1240	def breakpoint_function_wrapper(frame: lldb.SBFrame, bp_loc, internal_dict):	CODE

AI Structural Patterns2 hits · 2 pts

Severity	File	Line	Snippet	Context
LOW	tools/debug/nimlldb.py	230		CODE
LOW	tools/debug/nimlldb.py	1313		CODE

Fake / Example Data2 hits · 2 pts

Severity	File	Line	Snippet	Context
LOW	tests/testdata/string.txt	1	Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magn	CODE
LOW	tests/testdata/string.txt	1	Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magn	CODE

AI Slop Vocabulary1 hit · 1 pts

Severity	File	Line	Snippet	Context
LOW	tools/debug/nim-gdb.py	118	tname = target_type.name # could also just return 'string'	CODE