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SkillTotal

Is HackMD MCP server safe?

No malicious indicators - review capabilities before installing
Notable — review in context (a capability is not a malicious indicator):
  • MCP server launches a host command
  • npm prepare hook
  • MCP tool surface detected

What to do: Nothing here argues against installing it. Grant the capabilities it lists only if you expect the tool to need them.

HackMD MCP server is an MCP server analyzed by SkillTotal's deterministic static scanner. The scan found no malicious indicators. It can: install time execution and mcp tools detected — capabilities are what the code can do, not a verdict on intent. Risk score 0/100 (low).

hackmd-mcp 1.5.7

GitHub repository, read as an npm package · https://github.com/yuna0x0/hackmd-mcp
LOW
0
/ 100 risk score
Snapshot · scanned Nov 13, 2026 · hackmd-mcp@1.5.7 · engine 1.1.0 / ruleset 100

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Automated static-analysis result. It can contain false positives and false negatives, and is not a claim about the intent of HackMD MCP server's authors. Report a false positive.

Capabilities — what this component can do (not a risk score):
install time executionmcp tools detected

Behavioral traits

How this component maps to the CSA agentic threat model. Descriptive — it never affects the risk score.

Tool surface
Tool Usage
Execution authority
Tool Access Control / Direct Tool Access
Supply-chain provenance risk
General Protections / Supply Chain

Findings (3)

CapabilityMCP server launches a host commandnot scored · severity highST-MCP-SERVER-EXEC

An MCP server entry launches a command on your host.

manifest.json:14 
"type": "node",

Why it matters: Trusting the manifest means running that binary — verify what it is and where it comes from.

Fix: Verify the launched command and its source before trusting this MCP server configuration.

Capabilitynpm prepare hooknot scored · severity mediumST-INSTALL-NPM-PREPARE

package.json has a 'prepare' script (runs on git/local installs and before publishing).

package.json:23 
"prepare": "pnpm run build",

Why it matters: Usually a build step, but confirm it doesn't fetch or run remote code.

Fix: Usually a legitimate build step; confirm it only builds and does not fetch or execute remote code.

CapabilityMCP tool surface detectednot scored · severity lowST-MCP-DETECTED

An MCP tool surface (manifest or tool definitions) was found.

manifest.json:25 
"tools": [
server.json:1 
{
manifest.json:14 
"type": "node",
index.ts:123 
const server = new McpServer({
index.ts:190 
const transport = new StreamableHTTPServerTransport({
index.ts:256 
const stdioTransport = new StdioServerTransport();
tools/history.ts:6-7 
server.tool(
    "get_history",
tools/profile.ts:6-7 
server.tool(
    "get_user_info",
tools/teamNotes.ts:11-12 
server.tool(
    "list_team_notes",
tools/teamNotes.ts:43-44 
server.tool(
    "create_team_note",
tools/teamNotes.ts:78-79 
server.tool(
    "update_team_note",
tools/teamNotes.ts:114-115 
server.tool(
    "delete_team_note",
tools/teams.ts:6-7 
server.tool(
    "list_teams",
tools/userNotes.ts:11-12 
server.tool(
    "list_user_notes",
tools/userNotes.ts:41-42 
server.tool(
    "get_note",
tools/userNotes.ts:73-74 
server.tool(
    "create_note",
tools/userNotes.ts:107-108 
server.tool(
    "update_note",
tools/userNotes.ts:142-143 
server.tool(
    "delete_note",

Why it matters: Just context — review which tools it offers and their permissions.

Fix: Review the declared MCP tools and their permissions.

How attackers abuse these capabilities

Interactive labs on the attack class behind the rules above. They show the technique, not anything found in HackMD MCP server.

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How we determine this: deterministic static analysis (regex + AST), evidence-anchored, no code execution. Methodology →