semlayer runs on your own machine — the client starts it, so there is no endpoint to ping. 973 installs a week from pypi. Last commit 6 Nov 2026.
Infers a semantic layer from your data warehouse and serves it to agents over MCP.
We read the source, 1 d ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
const child = spawn(cliPath(), args, {
return yaml.load(text, Loader=_SAFE_LOADER) # a safe loader, C-accelerated
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mcp -- uvx semlayer
{
"mcpServers": {
"mcp": {
"command": "uvx",
"args": [
"semlayer"
]
}
}
}
[mcp_servers.mcp]
command = "uvx"
args = ["semlayer"]
{
"mcpServers": {
"mcp": {
"command": "uvx",
"args": [
"semlayer"
]
}
}
}
{
"servers": {
"mcp": {
"type": "stdio",
"command": "uvx",
"args": [
"semlayer"
]
}
}
}
Optional settings from the registry entry, left out of the block above:
ANTHROPIC_API_KEY (Optional. Descriptions and LLM-validated joins need it; statistics-only inference works without it).
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Answers built from our own checks of this server.