com.squirrelscan/squirrelscan

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

  warn25% of grade

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

  tool "run_audit" param "url" description: off-vendor URL in a description (example.com); capability text should not name where data goes. tool "add_website" param "url" description: off-vendor URL in a description (example.com); capability text should not name where data goes. tool "get_credit_balance" description: off-vendor URL in a description (squirrelscan.com); capability text should not name where data goes.

• 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 1.0.1 (patch bump): new tool "run_audit" touches a sensitive surface (email/exec/net/fs); new tool "get_audit_status" touches a sensitive surface (email/exec/net/fs); new tool "list_audits" touches a sensitive surface (email/exec/net/fs); new tool "list_websites" touches a sensitive surface (email/exec/net/fs); new tool "add_website" touches a sensitive surface (email/exec/net/fs); new tool "delete_website" touches a sensitive surface (email/exec/net/fs); new tool "delete_websites" touches a sensitive surface (email/exec/net/fs); new tool "get_report" touches a sensitive surface (email/exec/net/fs); new tool "compare_audits" touches a sensitive surface (email/exec/net/fs); new tool "list_issues" touches a sensitive surface (email/exec/net/fs); new tool "get_issue" touches a sensitive surface (email/exec/net/fs); new tool "comment_on_issue" appeared; new tool "list_rules" touches a sensitive surface (email/exec/net/fs); new tool "get_rule" touches a sensitive surface (email/exec/net/fs); new tool "whoami" appeared; new tool "get_credit_balance" whose description contains embedded outbound URL; new tool "list_credit_transactions" touches a sensitive surface (email/exec/net/fs); new tool "create_api_key" touches a sensitive surface (email/exec/net/fs); new tool "send_feedback" touches a sensitive surface (email/exec/net/fs); new tool "list_notifications" touches a sensitive surface (email/exec/net/fs).

• Transport config

  pass10% of grade

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

  remote endpoint "https://mcp.squirrelscan.com/mcp" uses TLS (https); remote endpoint uses OAuth (strongest auth mode)