io.github.chrisgleissner/c64bridge

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

  warn25% of grade

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

  dependency "yaml" is edit-distance 2 from popular package "yarn" (typosquat candidate)

• 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. scripts/capture-backend-switch-screenshots.mjs) — 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.

  references credential paths: scripts/update-readme.ts: references a credential path (/mcp.json) has both shell/exec and network egress — capable of download-and-run, though no such path was observed (scripts/check-node-compat.mjs: imports child_process and calls exec/spawn; generated/c64/index.js: outbound HTTP/socket call). has both shell/exec and destructive filesystem writes (scripts/check-node-compat.mjs: imports child_process and calls exec/spawn; scripts/cli.js: builds a path containing '..' (traversal-prone)). discloses shell/exec capability: 10 files (scripts/check-node-compat.mjs, scripts/check-package.mjs, scripts/generate-changelog.mjs, +7 more) discloses broad/destructive filesystem access: 7 files (scripts/cli.js, scripts/capture-backend-switch-screenshots.mjs, scripts/check-node-compat.mjs, +4 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 1.0.1 (patch bump): new capability primitive(s) in source: child_process, fs-write, http-client, net; new hardcoded outbound host/BCC destination(s): 127.0.0.1, 192.168.1.13, c64u, github.com.

• 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.