YaraFlux (ThreatFlux/YaraFlux) is an MCP server listed on the M8ven Trust Index. It scores 74 out of 100, grade C. It declares 40 tools. No publisher has claimed this listing.
A Model Context Protocol server that enables AI assistants to perform YARA rule-based threat analysis on files and URLs, supporting comprehensive rule management and detailed scanning results.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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ThreatFlux
Source: modelscope
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Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
40/40 tools missing one or more hints — scan_url_func (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); scan_data_func (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_scan_result_func (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +37 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Destructive tools are labelled
1 tool perform destructive updates without destructiveHint — clean_storage deletes at line 178 (os.remove(file_path))
Add destructiveHint:true to any tool whose handler calls .delete(), .upsert(), .update(), unlink, rm, DELETE, DROP, REPLACE INTO, or any operation that overwrites existing data.
Tool test coverage
20/40 tools referenced in tests (50%)
Write tests that reference each tool by name so every tool has at least one test.
Shell command execution
1 child_process/subprocess call in production code — runs shell commands (src/yaraflux_mcp_server/mcp_tools/scan_tools.py:85)
Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.
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