io.github.imattau/yunohost-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

  unscannable25% of grade

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

  No tool descriptions, server instructions, prompts, or resources were fetched; nothing to scan for injection.

• Supply chain

  pass25% of grade

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

  Python build script has no build-time network/exec; repository linkage verified

• Credential hygiene

  pass15% of grade

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

  Reads secrets from the environment (e.g. src/yunohost_mcp/approve.py) — the recommended intake shape. PASS = no static red flag; static analysis cannot prove the code honors env-based secret handling at runtime.

• Permission scope

  warn15% of grade

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

  has both shell/exec and network egress — capable of download-and-run, though no such path was observed (src/yunohost_mcp/yunohost/adapter.py: subprocess.* call; src/yunohost_mcp/auth/nostr_auth_lookup.py: outbound HTTP/socket call). has both shell/exec and destructive filesystem writes (src/yunohost_mcp/yunohost/adapter.py: subprocess.* call; src/yunohost_mcp/audit/log.py: open(…, 'w'/'a'/'x') write-mode file access). discloses shell/exec capability: src/yunohost_mcp/yunohost/adapter.py: subprocess.* call discloses broad/destructive filesystem access: 5 files (src/yunohost_mcp/audit/log.py, src/yunohost_mcp/audit/log.py, src/yunohost_mcp/auth/server_identity.py, +2 more) Capability DISCLOSURE, not a verdict: static analysis sees the primitive is present and reachable, not whether its use is attacker-controlled.

• 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 0.8.44 (patch bump): new capability primitive(s) in source: fs-write, net, subprocess; new hardcoded outbound host/BCC destination(s): 127.0.0.1, a.example, a2.example, armada.example, b.example, different.example, example, example.com, example.org, example.test, github.com, invite.test, mcp.3nostr.com, mcp.example.com, mcp.lostcause.nohost.me, nips.nostr.com, nope.invalid, offline.example, online.example, other.example, public.example, recovering.example, relay.example, testserver, user, your-domain.

• Transport config

  warn10% of grade

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

  manifest/source references tracking behavior — disclosure