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Non-AI static analysis layer for AI IDEs and coding agents - bug detection, security scanning, and CVE checking via MCP
Cursor Rules are .cursorrules / .cursor/rules files that steer Cursor's AI; scanned with the same pipeline.
We found this by crawling public sources and nobody has attested to it. That is how most of the registry gets here, and it is not a mark against the artifact — it only means no authenticated act of publication is on record. An artifact can be the vendor's own and still appear here.
20 critical findings reported by cisco-skill-scanner, agent-audit-kit, 17 of them in the installed artifact. The composite score alone does not reflect this — read the per-scanner reports below.
This artifact ships from 2 sources and their verdicts differ. The worst is github (Flagged). Installing from a cleaner source does not mean the others are safe — check the source you actually install from.
github: https://github.com/mustel-py/mustel, 121 findings
Cursor Rules are .cursorrules / .cursor/rules files that steer Cursor's AI. Review the scanned source before copying them into your own project.
nerlo install -- mustel
5 of 11 scanners examined this package. The rest do not apply to it — language, ecosystem and packaging decide which analyzers can say anything, and a scanner that cannot examine an artifact reports nothing rather than passing it.
v2.0.11
69 findings · 10.2s
v0.3.74
16 findings · 3.3s
v0.1.0
8 findings · 4.4s
v0.1.0
0 findings · 4.4s
v0.1.0
0 findings · 9.9s
v1.4.0
None of the entry points this scanner reads were found in this artifact. What each scanner covers
0 findings · 0.2s
vv0.3.2
No Go packages were found in this artifact. What each scanner covers
0 findings · 0.1s
No report in this scan: govulncheck, osv-scanner, trivy, trivy_image.
1 scan on record. Every scan's full results are retained immutably for 24 months.
| Completed | Composite | Change | Scanners | Status |
|---|---|---|---|---|
| Aug 21, 2026 | Scan Halted | — | agentshield ·n/a: not applicablecisco-skill-scanner: completeagent-audit-kit: completenerlo-behavioral: completenerlo-install-instruction: completecapslock ·n/a: not applicablenerlo-multi-source: complete | rejected |
Findings in files this artifact installs stand as reported; a model re-read the rest and said which ones it believes are false positives. This is a second opinion published beside the evidence, not a correction to it: the per-scanner reports above are unchanged, every dismissed finding is still listed there at its original severity, and the score and the Flagged badge are computed from those raw severities alone. Nothing below moved them.
Out of 93 findings across every scanner that examined this package. 3 of 20 findings rated critical by their scanner were among the dismissals.
Two keys had to turn. The model had to name a reason from a fixed list of six, and a deterministic check of ours — over which files this artifact actually installs — had to independently agree. Anything it could not corroborate is in “not reviewed” above, at full severity.
11 Test or fixture file — The match is in a test or fixture. Our own check confirmed the file is not part of what gets installed.
Rules: COMMAND_INJECTION_OS_SYSTEM, SQL_INJECTION_STRING_FORMAT, COMMAND_INJECTION_SHELL_TRUE and 1 more · Files: /repo/tests/test_projects/project_scraper/scraper.py, /repo/tests/test_projects/project_auth/auth.py, /repo/tests/test_projects/project_hard/hard.py and 1 more · reported by cisco-skill-scanner
6 CI or editor configuration — The match is in build, CI or editor configuration, confirmed by our own check to be outside the installed artifact.
Rules: SOCIAL_ENG_VAGUE_DESCRIPTION, MANIFEST_MISSING_LICENSE, MANIFEST_INVALID_NAME · Files: /repo/.github/SKILL.md, /repo/.github/ISSUE_TEMPLATE/SKILL.md · reported by cisco-skill-scanner
These findings are in files this artifact installs and are not placeholder values. No false-positive basis can be corroborated for such a finding, so this review never dismisses one; they were not sent to the model and stand at their scanner's severity.
10 COMMAND_INJECTION_SHELL_TRUE
Files: /repo/benchmarks/projects/project_independent/app_vuln_api.py, /repo/benchmarks/projects/project_auth/app.py · reported by cisco-skill-scanner
8 COMMAND_INJECTION_EVAL
Files: /repo/benchmarks/projects/project_independent/app_vuln_api.py, /repo/benchmarks/score_independent.py · reported by cisco-skill-scanner
8 DATA_EXFIL_NETWORK_REQUESTS
Files: /repo/benchmarks/projects/project_auth/app.py, /repo/benchmarks/projects/project_backend/app.py, /repo/benchmarks/run_benchmark.py · reported by cisco-skill-scanner
6 FILE_MAGIC_MISMATCH
Files: /repo/benchmarks/token_data/evfa_scan.txt, /repo/benchmarks/token_test_prompt.txt, /repo/benchmarks/token_data/response_without_mustel.txt · reported by cisco-skill-scanner
6 HIDDEN_DATA_FILE
Files: /repo/benchmarks/projects/project_backend/.mustel/cache.json, /repo/.windsurfrules, /repo/.pre-commit-config.yaml and 1 more · reported by cisco-skill-scanner
The model could have called any of these a false positive and did not.
1 AAK-MCP-ENV-PLACEHOLDER-EXFIL-001
Files: mustel/bootstrap.py · reported by agent-audit-kit
Critical vulnerabilities include command injection, SQL injection, and data exfiltration.
The artifact contains multiple critical command injection vulnerabilities, allowing shell execution in files like `/repo/benchmarks/projects/project_independent/app_vuln_api.py` and `/repo/benchmarks/score_independent.py`. Critical SQL injection vulnerabilities are present in `/repo/benchmarks/projects/project_auth/app.py` and `/repo/benchmarks/projects/project_independent/app_vuln_web.py`, with one instance potentially leading to remote code execution in `benchmarks/token_benchmark.py`. Data exfiltration via HTTP POST is identified in `/repo/benchmarks/projects/project_independent/app_vuln_api.py`, and a critical secret is exposed in `benchmarks/projects/project_backend/app.py`.
Concern level assessed by the review: Critical. This is the review's scale, not the registry badge.
Reviewed by gemini-2.5-flash. The model sees the findings, not your code, and cannot change a score.
4 opt.nerlo-rules.nerlo-py-dynamic-exec
Files: /repo/benchmarks/projects/project_auth/app.py, /repo/benchmarks/projects/project_independent/app_vuln_api.py · reported by nerlo-behavioral
4 opt.nerlo-rules.unauthenticated-code-execution-endpoint
Files: /repo/benchmarks/projects/project_auth/app.py, /repo/benchmarks/projects/project_independent/app_vuln_api.py · reported by nerlo-behavioral
4 SQL_INJECTION_STRING_FORMAT
Files: /repo/benchmarks/projects/project_auth/app.py, /repo/benchmarks/projects/project_independent/app_vuln_web.py · reported by cisco-skill-scanner
3 AAK-SECRET-004
Files: benchmarks/token_benchmark.py, mustel/patterns/django.yaml, benchmarks/projects/project_backend/app.py · reported by agent-audit-kit
2 AAK-MCP-006
Files: .mcp.json, .cursor/mcp.json · reported by agent-audit-kit
2 AAK-MCP-ATTEST-001
Files: .mcp.json, .cursor/mcp.json · reported by agent-audit-kit
2 DATA_EXFIL_HTTP_POST
Files: /repo/benchmarks/projects/project_independent/app_vuln_api.py · reported by cisco-skill-scanner
2 MANIFEST_MISSING_LICENSE
Files: /repo/SKILL.md, /repo/benchmarks/SKILL.md · reported by cisco-skill-scanner
2 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/SKILL.md, /repo/benchmarks/SKILL.md · reported by cisco-skill-scanner
2 TOOL_ABUSE_UNDECLARED_NETWORK
Files: /repo/repo/CHANGELOG.md, /repo/benchmarks/repo/benchmarks/paper.md · reported by cisco-skill-scanner
2 YARA_tool_chaining_abuse_generic
Files: /repo/benchmarks/token_data/response_without_mustel.txt · reported by cisco-skill-scanner
1 AAK-ANTHROPIC-SDK-001
Files: mustel/mcp_server.py · reported by agent-audit-kit
1 AAK-DNS-REBIND-002
Files: pyproject.toml · reported by agent-audit-kit
1 AAK-HEALTHCARE-AI-004
Files: benchmarks/paper.md · reported by agent-audit-kit
1 AAK-LLM-SQL-RCE-001
Files: benchmarks/token_benchmark.py · reported by agent-audit-kit
1 AAK-MCP-SDK-CVE-2026-52869-001
Files: pyproject.toml · reported by agent-audit-kit
1 AAK-OAUTH-3P-001
Files: pyproject.toml · reported by agent-audit-kit
1 AAK-SECRET-003
Files: benchmarks/projects/project_backend/app.py · reported by agent-audit-kit
1 AAK-SUPPLY-004
Files: pyproject.toml · reported by agent-audit-kit
Showing 25 of 43; the rest are in the per-scanner reports above.