Aevrin Scanner Core

The shared scanning layer used by the Aevrin API and CLI. It resolves a target to a launch command, runs the version-pinned MCP security engine against the live server inside an isolated container, normalizes the engine's output into one finding model, maps findings to the OWASP MCP Top 10, and records what could not be assessed.

It does not decide security. The engine assigns severities, scores and grades; this package presents them.

This package is primarily an internal runtime dependency. Most users should install the aevrin CLI instead.

Development

uv sync
uv run ruff check .
uv run mypy aevrin_scanner_core
uv run pytest

Scans require a reachable Docker daemon. There is no subprocess fallback: scanning an MCP server means starting it, which executes code published by someone else, so a scan without a sandbox does not run at all. See DECISIONS.md ADR-034.

Security model

• The scan container receives an allow-listed environment - never the Supabase service-role key, a provider key, or a cloud credential. It runs non-root, read-only, with every capability dropped and a hard timeout.
• A launch command is read from the project's own manifest, never guessed from a repository name: guessing scans a different package and attributes the grade to the wrong publisher.
• A scan that could not launch or enumerate is INCOMPLETE and receives no grade; missing coverage is never presented as a clean scan.
• Prompt injection through live tool responses (MCP08) remains explicitly outside static-scan coverage.