Langfuse MCP vs Last9 MCP Server
A side-by-side look at the Langfuse MCP and Last9 MCP Server MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Langfuse MCP for monitoring work as a local process; choose Last9 MCP Server for monitoring as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Langfuse MCP when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
LANGFUSE_PUBLIC_KEY. - You want tools like
listTraces, getTrace, listObservations.
Choose Last9 MCP Server when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
LAST9_REFRESH_TOKEN. - You want tools like
start_time_iso, end_time_iso, time_iso.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Monitoring | Monitoring |
| Quality signal | 57/100 · Good | 65/100 · Great |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | API key required | API key required |
| Pricing | BYOK (pay the provider) | Freemium |
| Required env vars | LANGFUSE_PUBLIC_KEY | LAST9_REFRESH_TOKEN |
| Verified owner | Community listing | Community listing |
| GitHub stars | 1 | 62 |
| Directory activity | 2 views 0 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | 27 | 80 |
| Full listing | View Langfuse MCP | View Last9 MCP Server |
Tools & capabilities
Langfuse MCP tools 27
listTracesList traces with filters. Returns summary metadata.getTraceFetch a single trace by id including the full observation tree.listObservationsList spans, generations, and events with filters.getObservationFetch a single observation by id.listSessionsList sessions within a time range.getSessionFetch a session by id, including its traces.listScoresList scores with filters.getScoreFetch a single score by id.listScoreConfigsList score configurations (definitions, ranges, categories).getScoreConfigFetch a score configuration by id.listPromptsList prompt definitions, optionally filtered by name, label, or tag.getPromptFetch a prompt by name, optionally pinned to a specific version or label.- +15 more on the listing page
Last9 MCP Server tools 80
start_time_isoend_time_isotime_isolookback_minuteslimitservice_namespan_nameenvsort_byrequest_countthroughput_rpmhttp_4xx_count- +68 more on the listing page
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.
Langfuse MCP
{
"mcpServers": {
"hugoles-langfuse-mcp": {
"command": "npx",
"args": [
"-y",
"langfuse-mcp"
],
"env": {
"LANGFUSE_PUBLIC_KEY": "YOUR_LANGFUSE_PUBLIC_KEY_HERE"
}
}
}
}
Last9 MCP Server
{
"mcpServers": {
"last9-last9-mcp-server": {
"command": "npx",
"args": [
"-y",
"@last9/mcp-server@latest"
],
"env": {
"LAST9_REFRESH_TOKEN": "YOUR_LAST9_REFRESH_TOKEN_HERE"
}
}
}
}
Frequently asked questions
Langfuse MCP is categorized under Monitoring and uses a local stdio subprocess. Last9 MCP Server belongs to Monitoring and uses a local stdio subprocess. Pick Langfuse MCP for monitoring work and Last9 MCP Server for monitoring.
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.
Langfuse MCP is bring-your-own-key: usage is billed by the API provider you supply a key for. Auth: api key required. Last9 MCP Server is listed as freemium — a free tier with paid plans. Auth: api key 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 hugoles-langfuse-mcp and last9-last9-mcp-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Langfuse MCP has a quality signal of 57/100 (Good) with 2 views, 0 installs and 1 GitHub stars. Last9 MCP Server has 65/100 (Great) with 4 views, 0 installs and 62 GitHub stars.