io.github.jgravelle/jcodemunch-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

  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

  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. benchmarks/profile_language_filter.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.

  references credential paths: src/jcodemunch_mcp/secret_classifier.py: references a credential path (id_rsa) has both shell/exec and network egress — capable of download-and-run, though no such path was observed (benchmarks/codex_surface/run_codex_arms.py: subprocess.* call; benchmarks/route_recall/measure_route_discriminators.py: outbound HTTP/socket call). has both shell/exec and destructive filesystem writes (benchmarks/codex_surface/run_codex_arms.py: subprocess.* call; benchmarks/profile_language_filter.py: open(…, 'w'/'a'/'x') write-mode file access). discloses shell/exec capability: 35 files (benchmarks/codex_surface/run_codex_arms.py, benchmarks/harness/run_benchmark.py, benchmarks/offload/run_offload_criterion.py, +32 more) discloses broad/destructive filesystem access: 13 files (benchmarks/profile_language_filter.py, benchmarks/cache_stability/measure.py, benchmarks/codex_surface/run_codex_arms.py, +10 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 1.108.315 (patch bump): new capability primitive(s) in source: dynamic-eval, fs-write, http-client, subprocess; new hardcoded outbound host/BCC destination(s): api.github.com, api.groq.com, api.minimax.io, api.openai.com, api.z.ai, bford.info, cdn.jsdelivr.net, claude.com, console.groq.com, example.com, example.invalid, ffmpeg.org, github.com, groq.com, huggingface.co, j.gravelle.us, j.gravelle.us., jcodemunch.com, json.schemastore.org, mcp.example.com, nextjs.org, openrouter.ai, raw.githubusercontent.com, www.apple.com, www.reddit.com.

• Transport config

  fail10% of grade

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

  source performs runtime self-update / download-and-execute (bypasses version_behavior); sends telemetry to third-party SDK (Datadog) — disclosure, verify opt-in; manifest/source references telemetry behavior — disclosure