Magic MCP vs Kconfig MCP
A side-by-side look at the Magic MCP and Kconfig MCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
K
Kconfig MCPDeveloper Tools · Local subprocess (stdio)Why can't I enable CONFIG_X? Explains Kconfig dependencies and finds a verified fix.53GoodAuth: no auth requiredVerdict: choose Magic MCP for developer tools work as a local process; choose Kconfig MCP for developer tools as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Magic MCP when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
TWENTY_FIRST_API_KEY, API_KEY_21ST.
KChoose Kconfig MCP when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
kconfig_load, kconfig_why_not, kconfig_symbol.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | K Kconfig MCP | |
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 53/100 · Good | 53/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | API key required | No auth required |
| Pricing | Paid service | Free |
| Required env vars | TWENTY_FIRST_API_KEYAPI_KEY_21ST | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 5,997 | 0 |
| Directory activity | 16 views 1 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | Not listed | 9 |
| Full listing | View Magic MCP | View Kconfig MCP |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
Kconfig MCP tools 9
kconfig_loadParse a tree (plus optional `.config`) into a named session. Reports undefined variables and warnings.kconfig_why_notThe unmet conditions behind `symbol` not being `y`/`m`/`n`, recursively with file:line, plus a verified minimal fix and its side effects.kconfig_symbolType, prompt, value and *why* it has that value, assignable values, dependencies, defaults, select/imply in both directions, help text.kconfig_what_selectsEvery symbol that selects or implies this one, with current values and which are active.kconfig_searchRegex search over names, prompts and help, with name matches first.kconfig_setAssign a value as menuconfig would, and report every other symbol that changed. A refused assignment says so.kconfig_diffCompare with another `.config`, or with a defconfig or fragment using `fragment=True`.kconfig_saveWrite `.config`, or a minimal defconfig with `minimal=True`.kconfig_sessionsManage loaded trees.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Magic MCP
{
"mcpServers": {
"21st-dev-magic-mcp": {
"command": "npx",
"args": [
"-y",
"@21st-dev/cli@latest"
],
"env": {
"TWENTY_FIRST_API_KEY": "YOUR_TWENTY_FIRST_API_KEY_HERE",
"API_KEY_21ST": "YOUR_API_KEY_21ST_HERE"
}
}
}
}
Kconfig MCP
{
"mcpServers": {
"kconfig-mcp": {
"command": "uvx",
"args": [
"kconfig-mcp"
]
}
}
}
Frequently asked questions
Magic MCP is categorized under Developer Tools and uses a local stdio subprocess. Kconfig MCP belongs to Developer Tools and uses a local stdio subprocess. Pick Magic MCP for developer tools work and Kconfig MCP for developer tools.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Magic MCP is listed as a paid service. Auth: api key required. Kconfig MCP is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add 21st-dev-magic-mcp and kconfig-mcp as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Magic MCP has a quality signal of 53/100 (Good) with 16 views, 1 installs and 5,997 GitHub stars. Kconfig MCP has 53/100 (Good) with 0 views, 0 installs and 0 GitHub stars.