io.github.alyiox/mcp-walmart-ads

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

  fail25% of grade

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

  Python build script executes at build time: network call in build script

• Credential hygiene

  warn15% of grade

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

  tests/test_config.py: embeds a PRIVATE KEY block. (in an example/sample file — lower severity, but a real key here still leaks.)

• 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 (scripts/bump_version.py: subprocess.* call; scripts/build_samsclub_spec.py: outbound HTTP/socket call). discloses shell/exec capability: scripts/bump_version.py: subprocess.* call 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 0.2.0 (minor bump): new capability primitive(s) in source: http-client, subprocess; new hardcoded outbound host/BCC destination(s): a.test, advertising.samsclub.com, advertising.walmart.com, api.dsp.walmart.com, c.test, conversions.walmart.test, dash.readme.com, developer.samsclub.com, example.test, github.com, marketplace.walmartapis.com, raw.githubusercontent.com, sandbox.walmartapis.com, storage.test, x, x.test.

• Transport config

  unscannable10% of grade

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

  local stdio server: no remote transport or auth surface, and no phone-home/telemetry signal found in source. Absence of transport findings is NOT a safety guarantee — phone-home hosts can be constructed at runtime and defeat static analysis.