registry / @cachly-dev/mcp-server / 0.10.201

@cachly-dev/mcp-server@0.10.201

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AI Security Review

scanned 8d ago · by lpm-firewall-ai

The source shows a guarded, first-party configuration change after device authorization, not an unconsented install-hook mutation or unrelated credential transfer. Classify as suspicious under the agent extension lifecycle risk policy.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

An unauthenticated MCP tool call starts sign-in; the configuration write occurs after device authorization returns a token.

Impact

The global editor configuration is modified and retains a Cachly credential for later MCP use; no unrelated credential recipient or broader control-surface attack was established.

Mechanism

The runtime stores the token in the Cachly entry in the global Claude Code MCP configuration.

AI rationale

Evidence

dist/src/index.js~/.claude/mcp.json

Network endpoints2

api.cachly.devauth.cachly.dev

Decision evidence

public snapshot

AI called this Suspicious at 90.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The postinstall hook only displays setup instructions; the manifest points it to a script, and that script recommends running the setup command.
An unauthenticated MCP tool call enters the sign-in flow, which presents a browser link and code for user authorization.
After receiving an access token, the runtime stores it in the global Claude Code MCP configuration for Cachly.
The package also updates Cachly configuration in existing editor entries; this is first-party integration setup, but it mutates editor configuration after sign-in.

Evidence against

The configuration write follows device authentication, and the install hook itself only prints instructions.
The credential is used for the Cachly service, and the inspected source does not establish an unrelated recipient or a broader agent-control hijack.

Behavioral surface

Source

ChildProcessDynamicRequireEnvironmentVarsEvalFilesystemNetwork

Supply chain

Source & flagged code

18 flagged

package.jsonView file

Lines 18-58json

18 },

19 "main": "./dist/src/index.js",

20 "scripts": {

21 "count-tools": "node scripts/count-tools.mjs",

22 "tool-catalog": "node scripts/tool-catalog.mjs summary",

23 "tool-catalog:json": "node scripts/tool-catalog.mjs json",

24 "tool-catalog:markdown": "node scripts/tool-catalog.mjs markdown",

25 "capability-docs": "node scripts/capability-docs.mjs markdown",

26 "capability-docs:write": "node scripts/capability-docs.mjs write",

27 "verify-capability-docs": "node scripts/capability-docs.mjs check",

28 "docs-atlas": "node scripts/docs-atlas.mjs summary",

29 "docs-atlas:write": "node scripts/docs-atlas.mjs write",

30 "verify-docs-atlas": "node scripts/docs-atlas.mjs check",

31 "tool-spec-snapshots:write": "node scripts/tool-spec-snapshots.mjs write",

32 "version": "node scripts/nummer-nachziehen.mjs && npm run tool-spec-snapshots:write",

33 "verify-tool-spec-snapshots": "node scripts/tool-spec-snapshots.mjs check",

34 "plugin-hooks:write": "tsx scripts/plugin-hooks-schreiben.mjs",

35 "verify-tool-counts": "node scripts/verify-tool-counts.mjs",

36 "verify-capabilities": "node scripts/verify-capabilities.mjs",

37 "build": "tsc && node scripts/paket-schliessen.mjs && node scripts/bauabdruck.mjs",

38 "postinstall": "node scripts/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L38

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg · L38

39 "dev": "tsx src/index.ts",

40 "start": "node dist/src/index.js",

41 "test": "vitest run",

42 "test:watch": "vitest",

43 "bench": "tsx src/bench/echter-korpus.ts",

44 "bench:spielzeug": "tsx src/bench/cachly-bench.ts",

45 "bench:external": "tsx src/bench/external-corpus.ts",

46 "bench:onboarding": "tsx src/bench/onboarding-bench.ts",

47 "bench:gate": "tsx src/bench/gate.ts",

48 "test:e2e": "bash scripts/e2e-run.sh",

49 "test:e2e:api": "bash scripts/e2e-run.sh api",

50 "test:e2e:cli": "bash scripts/e2e-run.sh cli",

51 "test:e2e:tools": "bash scripts/e2e-run.sh tools",

52 "test:e2e:funnel": "bash scripts/e2e-run.sh funnel",

53 "test:e2e:provisioning": "bash scripts/e2e-run.sh provisioning",

54 "lint": "eslint src",

55 "typecheck": "tsc --noEmit",

56 "bench:cost": "tsx src/bench/cost.ts",

57 "bench:zurueckhaltung": "tsx src/bench/zurueckhaltung-messen.ts",

58 "bench:ausgabe": "tsx src/bench/ausgabe-reihenfolge-messen.ts",

dist/src/autor.jsView file

Lines 1-2javascript

1import{execFileSync as c}from"node:child_process";const f=e=>n=>{try{return n.startsWith("-")?"":c(

dist/src/index.jsView file

Lines 1-21javascript

1#!/usr/bin/env node

2import{setzeClientKennung as Bt}from"./herkunft.js";import{jwtExpiryMs as jt,checkJwt as Ht,handleApiError as Ot,diagnoseAuth as _e,planAuthHeal as Pe,readClientCredentialsFromEnv as Pt,buildClientCredentialsBody as Mt,clientCredentialsTokenUrl as Dt}

dist/src/lernen.jsView file

Lines 1-7javascript

1import{appendFileSync as B,mkdirSync as U,readFileSync as S,readdirSync as K,rmSync as E,statSync as D,writeFileSync as y}from"node:fs";import{join as h}from"node:path";import{tmpdir

dist/src/cls-hook.jsView file

6`+n+` L7: `,"utf-8"),await s(t,493).catch(()=>{}),"appended"}const _="try{var p={instance_id:process.env.CACHLY_BRAIN_INSTANCE_ID,source:'git_commit',payload:{message:process.env.CLS_MSG||''... L8: `)}export{p as CLS_HOOK_VERSION,L as buildClsPostCommitHook,A as installClsPostCommitHook};

High

Runtime Package Install

Package source invokes a package manager install command at runtime.

dist/src/cls-hook.jsView on unpkg · L6

dist/src/doctor.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 4

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

dist/src/doctor.js#virtual:normalized:round1View on unpkg

hooks/cachly-ambient-einblendung.mjsView file

•matchType = normalized_sha256 matchedPackage = @cachly-dev/mcp-server@0.10.197 matchedPath = hooks/cachly-ambient-einblendung.mjs matchedIdentity = npm:QGNhY2hseS1kZXYvbWNwLXNlcnZlcg:0.10.197 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High