io.github.dizzlkheinz/ynab-mcpb

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.

  install hook "prepare" present and not a recognized benign build command

• Credential hygiene

  warn15% of grade

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

  src/server/__tests__/requestLogger.test.ts: assigns a literal to api_key (secr…56 (len 14)) — non-provider secret literal; prefer environment intake. src/server/__tests__/requestLogger.test.ts: assigns a literal to password (secr…rd (len 15)) — non-provider secret literal; prefer environment intake. src/server/__tests__/requestLogger.test.ts: assigns a literal to api_key (nest…ey (len 17)) — non-provider secret literal; prefer environment intake. src/server/__tests__/security.integration.test.ts: assigns a literal to api_key (secr…89 (len 21)) — non-provider secret literal; prefer environment intake. Reads secrets from the environment (e.g. scripts/run-generate-mcpb.js) — the recommended intake shape.

• Permission scope

  fail15% of grade

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

  HIGH: shell/exec capability AND destructive filesystem writes together (scripts/create-pr-description.js: imports child_process and calls exec/spawn; bin/ynab-mcp-server.cjs: path traversal ('../') combined with file access). discloses shell/exec capability: scripts/create-pr-description.js: imports child_process and calls exec/spawn discloses shell/exec capability: scripts/run-all-tests.js: imports child_process and calls exec/spawn discloses shell/exec capability: scripts/run-domain-integration-tests.js: imports child_process and calls exec/spawn discloses shell/exec capability: scripts/run-generate-mcpb.js: imports child_process and calls exec/spawn discloses shell/exec capability: scripts/run-throttled-integration-tests.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/__tests__/testRunner.ts: imports child_process and calls exec/spawn discloses broad/destructive filesystem access: bin/ynab-mcp-server.cjs: path traversal ('../') combined with file access discloses broad/destructive filesystem access: scripts/create-pr-description.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: scripts/validate-env.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: scripts/verify-build.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/accountOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/accountTools.delta.integration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/accountTools.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/accountTools.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/analyzer.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/budgetOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/budgetTools.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/categoryOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/categoryTools.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/compareTransactions.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/comparisonOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/completions.integration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/__tests__/comprehensive.integration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/__tests__/csvParser.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/csvParser.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/deltaCache.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/deltaTestUtils.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/errorHandler.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/__tests__/executor.integration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/exportTransactions.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/compareTransactions/index.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/compareTransactions/index.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/index.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/monthOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/monthTools.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/compareTransactions/parser.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/compareTransactions/parser.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/__tests__/payeeNormalizer.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/payeeOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/payeeTools.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/__tests__/performance.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/prompts.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/__tests__/recommendationEngine.integration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/reconciliation/__tests__/reconciliation.delta.integration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/reconciliationOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/securityMiddleware.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/__tests__/setup.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/__tests__/smoke.e2e.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/__tests__/testRunner.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/__tests__/testUtils.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/toolCategories.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/toolRegistration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/types/toolRegistration.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/toolRegistry.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/toolRegistry.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/transactionMutationSchemas.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/schemas/outputs/__tests__/transactionOutputs.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/transactionSchemas.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/__tests__/transactionTools.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/tools/transactionWriteTools.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/YNABMCPServer.integration.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/__tests__/YNABMCPServer.test.ts: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/server/YNABMCPServer.ts: 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.dizzlkheinz/[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 tracking behavior — disclosure