Plzebo runs on your own machine — the client starts it, so there is no endpoint to ping. 47 installs a week from npm. Last commit 14 Aug 2026.
Cost-parity bench for agent loops: $/success and time across model mixes, with verifiable receipts.
Nothing serious here today
Today is the operative word: we check Plzebo every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
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 plzebo -- npx -y plzebo{
"mcpServers": {
"plzebo": {
"args": [
"-y",
"plzebo"
],
"command": "npx"
}
}
}[mcp_servers.plzebo]
command = "npx"
args = ["-y", "plzebo"]{
"mcpServers": {
"plzebo": {
"args": [
"-y",
"plzebo"
],
"command": "npx"
}
}
}{
"mcpServers": {
"plzebo": {
"args": [
"-y",
"plzebo"
],
"command": "npx"
}
}
}This one needs environment variables set before it will start:
ANTHROPIC_API_KEY (Real Anthropic key for placebo-mode arms; arms only ever see placebo keys. Optional when every arm uses passthrough auth.), OPENAI_API_KEY (Real OpenAI-compatible key for placebo-mode arms. Optional when every arm uses passthrough auth.).
The author declared them in the registry entry; get the values from the project itself.
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Plzebo — questions
Answers built from our own checks of this server.