io.github.reesehammer/umbra-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. docker-entrypoint.sh) — 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 (docker-entrypoint.sh: os.system/os.popen/os.exec* call; examples/baseline/02_search_catalog_handrolled.py: outbound HTTP/socket call). discloses shell/exec capability: docker-entrypoint.sh: os.system/os.popen/os.exec* 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 0.1.1 (patch bump): new capability primitive(s) in source: fs-write, http-client, subprocess; new hardcoded outbound host/BCC destination(s): ..., 127.0.0.1, a.tile.openstreetmap.org, api.anthropic.com, api.canopy.umbra.space, api.openai.com, api.stacspec.org, cdn.proj.org, copernicus-dem-30m.s3.amazonaws.com, docs.canopy.umbra.space, docs.protomaps.com, ex, example, example.com, gateway.example, geotiffjs.github.io, github.com, llmstxt.org, nominatim.openstreetmap.org, nominatim.org, openrouter.ai, other.example.com, proxy.example, pypi.org, raw.githubusercontent.com, registry.npmjs.org, registry.opendata.aws, s, s3., s3.amazonaws.com, s3.us-west-2.amazonaws.com, stac-geoparquet.org, static.modelcontextprotocol.io, testserver, tile.openstreetmap.org, umbra-open-data-catalog.s3.amazonaws.com, umbra-py.space, umbra.space, unpkg.com, www.opengis.net, www.w3.org, x, x.s3.amazonaws.com.

• Transport config

  warn10% of grade

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

  sends telemetry to third-party SDK (amplitude) — disclosure, verify opt-in; manifest/source references tracking behavior — disclosure