io.github.eltociear/skill-audit-mcp

What we checked

Six static checks, weighted by risk. Every result reflects only what could be observed in the published package and repository — never intent.

• Injection surface

  fail25% of grade

  Tool descriptions/manifest scanned for instruction-injection patterns (imperatives at the model, hidden text, 'ignore previous', data-exfil URLs).

  tool "audit_skill_text" description: names an outbound copy/exfil destination (BCC/exfil verb). tool "audit_skill_url" description: names an outbound copy/exfil destination (BCC/exfil verb).

• Supply chain

  pass25% of grade

  Package provenance: namespace verification, repo linkage, maintainer count, account age, postinstall scripts, typosquat distance.

  repository linkage verified

• Credential hygiene

  pass15% of grade

  How the server takes secrets (env vs plaintext config vs hardcoded); secrets appearing in tool schemas.

  No hardcoded secrets, secret-shaped tool parameters, or leaked keys found. PASS = no static red flag; static analysis cannot prove the code honors env-based secret handling at runtime.

• Permission scope

  pass15% of grade

  Declared tools vs. breadth (filesystem, network, exec); flags shell-exec and unbounded filesystem access.

  No shell-exec, unbounded/sensitive filesystem, or download-and-run primitives found in scanned source. PASS = no static red flag. Static scanning is blind to code fetched or executed at runtime.

• Version behavior

  fail10% of grade

  Diff of tool definitions between versions; new permissions or changed descriptions in a patch release (the postmark-mcp class).

  vs prior 1.0.2 (minor bump): new tool "paid_catalogue" touches a sensitive surface (email/exec/net/fs); new tool "air_quality" appeared; new tool "geocode" appeared; new tool "earthquakes" appeared; new tool "public_holidays" appeared; new tool "country_indicator" appeared; new tool "elevation" appeared; new tool "web_search" touches a sensitive surface (email/exec/net/fs); new tool "read_url" touches a sensitive surface (email/exec/net/fs); new tool "audit_skill_text" touches a sensitive surface (email/exec/net/fs); new tool "audit_skill_url" touches a sensitive surface (email/exec/net/fs); new hardcoded outbound host/BCC destination(s): github.com.

• Transport config

  fail10% of grade

  Remote servers: TLS and auth mode (none/token/OAuth). Local servers: whether the manifest indicates it phones home.

  remote MCP endpoint declares NO authentication (unauthenticated remote — nginx-ui/CVE-2026-33032 class)