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pyobfus — the Python obfuscator. AST-based name mangling + framework presets (FastAPI/Django/Pydantic/Click/SQLAlchemy) + reverse stack-trace mapping for AI debugging in Claude Code / Cursor. A transparent PyArmor alternative: AST-level protection with debuggable traces. Apache-2.0.
The publisher performed an authenticated act of publication — proving control of a namespace in the official MCP registry, or appearing in a first-party catalogue an operator curates. That establishes WHO published it. It is not a security finding, and attested artifacts carry Flagged verdicts too.
358 critical findings reported by cisco-skill-scanner, agent-audit-kit, 11 of them in the installed artifact. The composite score alone does not reflect this — read the per-scanner reports below.
This artifact ships from 4 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. Some sources have no verdict at all; that is not a pass.
github: https://github.com/zhurong2020/pyobfus, 548 findings
Choose your runtime: the CLI writes the mcpServers config entry for that target.
nerlo install --target claude-code -- pyobfus
Install respects the composite badge: Clean proceeds, Caution prompts for confirmation, and Flagged is refused. Write operations require an API token.
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
268 findings · 14.8s
v0.3.26
222 findings · 9.8s
v0.1.0
4 findings · 28.3s
v0.1.0
4 findings · 28.3s
v0.1.0
0 findings · 24.7s
v1.4.0
This scanner found nothing in this artifact that it assesses. What each scanner covers
0 findings · 0.2s
No report in this scan: capslock, 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 3, 2026 | Scan Halted | — | agentshield ·n/a: not applicablecisco-skill-scanner: completeagent-audit-kit: completenerlo-behavioral: completenerlo-install-instruction: completenerlo-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 498 findings across every scanner that examined this package. 343 of 358 findings rated critical by their scanner were among the dismissals.
Not reviewed is not the same as clean. Those 1 finding stand exactly as their scanners reported them, at full severity, as they would have without this review.
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.
197 Agent instruction file — The match is in a file that instructs an AI coding agent — a CLAUDE.md or similar. It is documentation of intent, and our own check confirmed it is not part of what gets installed.
Rules: AAK-AGENT-001, AAK-AGENT-002, TOOL_ABUSE_UNDECLARED_NETWORK · Files: AGENTS.md, CLAUDE.md, /repo/repo/AGENTS.md · reported by agent-audit-kit, cisco-skill-scanner
167 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_EVAL, AAK-SECRET-004, SECRET_CONNECTION_STRING and 3 more · Files: /repo/tests/integration/test_simple_obfuscation.py, /repo/tests/test_ai_artifact_stripper.py, /repo/tests/test_anti_debug.py and 24 more · reported by cisco-skill-scanner, agent-audit-kit
41 Documentation or example — The match is in documentation or sample code, confirmed by our own check to be outside the installed artifact.
Rules: AAK-HEALTHCARE-AI-005, PIPELINE_TAINT_FLOW, opt.nerlo-rules.nerlo-install-pipe-to-shell and 10 more · Files: docs/POST_V0.4_TODO.md, docs/ROADMAP.md, docs/V0.4_EXECUTION_LOG.md and 18 more · reported by agent-audit-kit, cisco-skill-scanner, nerlo-install-instruction
3 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: AAK-GHA-IMMUTABLE-001, MANIFEST_INVALID_NAME · Files: .github/workflows/draft-pdf.yml, /repo/.github/ISSUE_TEMPLATE/SKILL.md, /repo/.github/SKILL.md · reported by agent-audit-kit, 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.
14 MANIFEST_MISSING_LICENSE
Files: /repo/skills/pyobfus-protect/SKILL.md, /repo/SKILL.md, /repo/.githooks/SKILL.md and 11 more · reported by cisco-skill-scanner
13 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/SKILL.md, /repo/.githooks/SKILL.md, /repo/skills/SKILL.md and 10 more · reported by cisco-skill-scanner
11 COMMAND_INJECTION_EVAL
Files: /repo/pyobfus/core/generator.py, /repo/pyobfus/core/parser.py, /repo/pyobfus/core/transformer.py and 4 more · reported by cisco-skill-scanner
8 DATA_EXFIL_JS_NETWORK
Files: /repo/cloudflare-worker/src/content_webhook.js, /repo/cloudflare-worker/src/index.js · reported by cisco-skill-scanner
6 AAK-HEALTHCARE-AI-004
Files: paper/paper.md, _drafts/article-01-claude-code-mcp-integration.md, _drafts/de-ai-methodology.md and 3 more · reported by agent-audit-kit
5
1 The model called these false positives and our own check did not agree, so the dismissal was refused.
Rules: HIDDEN_DATA_FILE · Files: /repo/.env.stripe.example · reported by cisco-skill-scanner
Critical shell execution and credential access risks identified.
The artifact contains multiple instances of potential shell command injection in Python core and transformer files, which could lead to arbitrary code execution. It also exposes secrets in `pyobfus_pro/transformers/vault.py` and facilitates network egress of sensitive data from JavaScript files in the `cloudflare-worker` directory. Additionally, the artifact includes a critical compound fetch-execute pattern in a template file.
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.
Files: /repo/_drafts/SKILL.md, /repo/benchmarks/llm_resistance/SKILL.md, /repo/_drafts/launch-v0.5.4/SKILL.md and 2 more · reported by cisco-skill-scanner
5 PIPELINE_TAINT_FLOW
Files: /repo/templates/python-baseline/bootstrap.sh, /repo/templates/python-baseline/README.md, /repo/templates/python-baseline/SKILL.md · reported by cisco-skill-scanner
3 COMPOUND_FETCH_EXECUTE
Files: /repo/templates/python-baseline/SKILL.md, /repo/templates/python-baseline/README.md · reported by cisco-skill-scanner
3 HIDDEN_DATA_FILE
Files: /repo/.readthedocs.yaml, /repo/.githooks/README.md, /repo/.githooks/pre-commit · reported by cisco-skill-scanner
3 opt.nerlo-rules.nerlo-js-secret-to-network-egress
Files: /repo/cloudflare-worker/src/content_webhook.js, /repo/cloudflare-worker/src/index.js · reported by nerlo-behavioral
3 YARA_prompt_injection_generic
Files: /repo/skills/pyobfus-protect/SKILL.md · reported by cisco-skill-scanner
2 DATA_EXFIL_NETWORK_REQUESTS
Files: /repo/pyobfus_pro/license.py · reported by cisco-skill-scanner
2 FILE_MAGIC_MISMATCH
Files: /repo/llms-full.txt, /repo/llms.txt · reported by cisco-skill-scanner
2 RESOURCE_ABUSE_INFINITE_LOOP
Files: /repo/pyobfus/core/orchestrator.py, /repo/pyobfus_pro/forensic/watermark.py · reported by cisco-skill-scanner
1 AAK-MARKETPLACE-001
Files: .claude-plugin/marketplace.json · reported by agent-audit-kit
1 AAK-MCP-018
Files: pyobfus_mcp/pyobfus_mcp/server.py · reported by agent-audit-kit
1 AAK-SECRET-004
Files: pyobfus_pro/transformers/vault.py · reported by agent-audit-kit
1 AAK-SUPPLY-004
Files: pyproject.toml · reported by agent-audit-kit
1 EXCESSIVE_FILE_COUNT
Files: /repo/. · reported by cisco-skill-scanner
1 LOW_ANALYZABILITY
Files: /repo/cloudflare-worker · reported by cisco-skill-scanner
1 opt.nerlo-rules.nerlo-hardcoded-external-egress
Files: /repo/cloudflare-worker/src/index.js · reported by nerlo-behavioral
1 opt.nerlo-rules.nerlo-install-fetch-raw-then-run
Files: /repo/templates/python-baseline/README.md · reported by nerlo-install-instruction
1 opt.nerlo-rules.nerlo-install-pipe-to-shell
Files: /repo/templates/python-baseline/README.md · reported by nerlo-install-instruction
Showing 25 of 26; the rest are in the per-scanner reports above.