SkillTotal

Is Exa MCP server safe?

No malicious indicators - review capabilities before installing
Notable — review in context (capabilities are not malware):
  • npm prepare hook
  • MCP tool surface detected

exa-mcp-server is an AI mcp_server analyzed by SkillTotal's deterministic static scanner. The scan found no malicious indicators, though 2 risky constructs are reported for review. 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).

exa-mcp-server 3.4.0

mcp_server · https://github.com/exa-labs/exa-mcp-server
LOW
0
/ 100 risk score
Snapshot · scanned Aug 8, 2026 · exa-mcp-server@3.4.0 · engine 0.38.1 / ruleset 42

Automated static-analysis result. It can contain false positives and false negatives, and is not a claim about the intent of Exa 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
Supply-chain provenance risk
General Protections / Supply Chain

Findings (2)

MEDIUMnpm prepare hookST-INSTALL-NPM-PREPARE

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

package.json:49-49 
"prepare": "npm run build:stdio",

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.

LOWMCP tool surface detectedST-MCP-DETECTED

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

.claude-plugin/plugin.json:10-10 
"mcpServers": {
gemini-extension.json:5-5 
"mcpServers": {
mcp.json:3-3 
"mcpServers": {
mcp.json:1-1 
{
server.json:1-1 
{

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

Fix: Review the declared MCP tools and their permissions.

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