add-mcpBLOCK
The open MCP config tool - npx add-mcp
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
Add MCP servers to your favorite coding agents with a single command.
Supports Claude Code, Codex, Cursor, OpenCode, VS Code, Grok Build and 16 more.
Docs and registry: add-mcp.com
Install an MCP Server
Install an MCP server by remote URL or package name:
npx add-mcp url | package name [options]
Example installing the Context7 remote MCP server:
npx add-mcp https://mcp.context7.com/mcp
Example installing the Context7 remote MCP server via the programmatic API — great for integrating add-mcp in your own CLI tool:
import { upsertServer } from "add-mcp";
const result = upsertServer(
"cursor",
"context7",
{ type: "http", url: "https://mcp.context7.com/mcp" },
{ local: true },
);
console.log(result);You can add env variables and arguments (stdio) and headers (remote) to the server config using the --env, --args and --header options. With ${VAR} placeholders, interactive installs prompt for each variable (omit skipped optional keys so empty strings are not written to config).
Find MCP Servers
Find and install MCP servers from the add-mcp registry:
npx add-mcp find vercel
The first find/search run automatically saves the add-mcp registry to ~/.config/add-mcp/config.json (or $XDG_CONFIG_HOME/add-mcp/config.json). You can edit that file to replace the default registry, add the official Anthropic registry, or point at any registry-compatible server.
Supported Agents
MCP servers can be installed to any of these agents:
e1fcad2b2c03OBSERVED · 2026-10-12Connect
Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control.
claude mcp add add-mcp-web -- npx -y add-mcp-web
{
"mcpServers": {
"add-mcp-web": {
"command": "npx",
"args": [
"-y",
"add-mcp-web"
]
}
}
}Exposed tools (2)
2 read · 0 write · 0 destructive.
| Tool | Risk | Description |
|---|---|---|
... | read | Edge case name |
com.neon.mcp | read | Neon MCP server |
Trust audit
BLOCKgrade D · trust 69/100 Do not install this without reading the findings. The audit found something that could harm you or your machine.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | PASS |
| L1 | Static analysis of the code | FAIL |
| L2 | Instruction surface (what it tells the agent) | PASS |
| L3 | Class-specific surface | WARN |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- none-observed
- Network
- declared (5 observation(s))
- Shell
- declared (1 observation(s))
- Dependencies
- not all pinned
- Secrets in source
- none-found
Findings (19)
const parsed = yaml.load(content);
streamable-http
.prettierignore
.prettierignore
const saved = yaml.load(readFileSync(gooseConfigPath, "utf-8")) as Record<
const saved = yaml.load(readFileSync(gooseConfigPath, "utf-8")) as Record<
return yaml.load(content) as Record<string, unknown>;
const parsed = yaml.load(content) as Record<string, unknown>;
import { parseSource } from "../../src/source-parser.js";} from "../../src/installer.js";
import { agents } from "../../src/agents.js";import { writeConfig, buildConfigWithKey } from "../../src/formats/index.js";import type { AgentType } from "../../src/types.js";redirectUri: "http://127.0.0.1:19876/callback",
redirect_uri: "http://127.0.0.1:19876/callback",
redirect_uri: "http://127.0.0.1:19876/callback",
@clack/prompts, @iarna/toml, chalk, commander, js-yaml, jsonc-parser, @types/js-yaml, @types/node
blume
registry.json
Gates applied: no_behavioural_pass.
e1fcad2b2c03full audit observations/trust-audit/mcp-server/neon-solutions__add-mcp.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-12 | e1fcad2b2c03 | BLOCK | D | 69 | first audit |
Questions
What is the add-mcp MCP server?
The open MCP config tool - npx add-mcp
What tools does add-mcp expose?
2 in total: 2 read-only, 0 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.
Is add-mcp safe to connect to an agent?
No — not without reading the findings first. The audit graded it D (69/100) and found 1 critical or high issue in the source. Each one is listed on this page with the file and line it is on.
What credentials does add-mcp need?
No credential environment variables were found in its source, so it appears to need none.
How does add-mcp run?
It speaks streamable-http, so it runs as a service you connect to over the network. It is published on npm as add-mcp-web.
How current is this page?
The grade is for one exact copy of the source (e1fcad2b2c03), read on 2026-10-12. The repository is watched and re-audited when it changes.