io.github.hannasdev/mcp-writing

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.

  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/index.js) — the recommended intake shape. PASS = no static red flag; static analysis cannot prove the code honors env-based secret handling at runtime.

• Permission scope

  fail15% of grade

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

  HIGH: shell/exec capability AND network egress together — download-and-execute risk (src/runtime/async-jobs.js: imports child_process and calls exec/spawn; src/scripts/manual-validation.mjs: outbound HTTP/socket call). HIGH: shell/exec capability AND destructive filesystem writes together (src/runtime/async-jobs.js: imports child_process and calls exec/spawn; src/runtime/async-jobs.js: path traversal ('../') combined with file access). discloses shell/exec capability: src/runtime/async-jobs.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/core/git.js: imports child_process and calls exec/spawn discloses shell/exec capability: bin/mcp-writing.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/scripts/manual-validation.mjs: imports child_process and calls exec/spawn discloses shell/exec capability: src/scripts/mcp-debug-client.mjs: imports child_process and calls exec/spawn discloses broad/destructive filesystem access: src/runtime/async-jobs.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/editing.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/core/filesystem-boundary.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/core/helpers.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/sync/importer.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/index.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/metadata.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/new-world-entity.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/scripts/new-world-entity.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/styleguide/prose-styleguide.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/review-bundles/review-bundles-planner.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/review-bundles/review-bundles-writer.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/sync/scrivener-direct.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/search.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/split-versions.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/structure/structure-restore.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/styleguide.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/sync/sync.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/sync.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/async-job-runner.mjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/check-legacy-root-imports.mjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/generate-tool-docs.mjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/manual-scrivener-realtest.mjs: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/scripts/manual-scrivener-realtest.mjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/manual-validation.mjs: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/scripts/manual-validation.mjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/normalize-scene-characters.mjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/profile-review-bundles.mjs: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/scripts/profile-review-bundles.mjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/scripts/sync-server-json-version.mjs: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/scripts/sync-server-json-version.mjs: path traversal ('../') combined with file access Capability DISCLOSURE, not a verdict: static analysis sees the primitive is present and reachable, not whether its use is attacker-controlled.

• Version behavior

  unscannable10% of grade

  Diff of tool definitions between versions; new permissions or changed descriptions in a patch release (the postmark-mcp class).

  no prior version to diff (first sight of io.github.hannasdev/[email protected]); version-drift / rug-pull cannot be evaluated. Cold-start risk is covered by point-in-time checks (injection_surface, supply_chain, credential_hygiene), not here.

• 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 telemetry behavior — disclosure